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Author: Grafiati
Published: 7 July 2024

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1

Wu, Ching-Yi, Kai-Chieh Lee, Yen-Ling Kuo, and Yu-Chie Chen. "Revisiting the quantitative features of surface-assisted laser desorption/ionization mass spectrometric analysis." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2079 (October 28, 2016): 20150379. http://dx.doi.org/10.1098/rsta.2015.0379.

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Surface-assisted laser desorption/ionization (SALDI) coupled with mass spectrometry (MS) is frequently used to analyse small organics owing to its clean background. Inorganic materials can be used as energy absorbers and the transfer medium to facilitate the desorption/ionization of analytes; thus, they are used as SALDI-assisting materials. Many studies have demonstrated the usefulness of SALDI-MS in quantitative analysis of small organics. However, some characteristics occurring in SALDI-MS require certain attention to ensure the reliability of the quantitative analysis results. The appearance of a coffee-ring effect in SALDI sample preparation is the primary factor that can affect quantitative SALDI-MS analysis results. However, to the best of our knowledge, there are no reports relating to quantitative SALDI-MS analysis that discuss or consider this effect. In this study, the coffee-ring effect is discussed using nanoparticles and nanostructured substrates as SALDI-assisting materials to show how this effect influences SALDI-MS analysis results. Potential solutions for overcoming the existing problems are also suggested. This article is part of the themed issue ‘Quantitative mass spectrometry’.
2

Szulc, Justyna, Artur Kołodziej, and Tomasz Ruman. "Silver-109/Silver/Gold Nanoparticle-Enhanced Target Surface-Assisted Laser Desorption/Ionisation Mass Spectrometry—The New Methods for an Assessment of Mycotoxin Concentration on Building Materials." Toxins 13, no. 1 (January 9, 2021): 45. http://dx.doi.org/10.3390/toxins13010045.

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This study aimed to detect and quantify mycotoxins on building materials using innovative laser mass spectroscopy methods—silver-109/silver/gold nanoparticle-enhanced target surface-assisted laser desorption/ionisation mass spectrometry (109AgNPs, AgNPs and AuNPs SALDI). Results from SALDI-type methods were also compared with commonly used matrix-assisted laser desorption/ionization (MALDI) mass spectrometry. Standards of seven moulds mycotoxin in a final concentration of 100 µg/mL for patulin, citrinin, 3-nitropropionic acid, alternariol and 20 µg/mL for sterigmatocystin, cyclopiazonic acid, roquefortine C in the mixture were tested in pure solutions and after extraction from the plasterboards. Among the studied SALDI-type method, the lowest detection limits and the highest signal intensity of the mycotoxins tested were obtained with the use of 109AgNPs SALDI MS. The 109AgNPs method may be considered as an alternative to the currently most frequently used method MALDI MS and also liquid chromatography tandem mass spectrometry LC-MS/MS for mycotoxin determination. Future studies should attempt to use these methods for mass spectrometry imaging (MSI) to evaluate spatial distribution and depth of mycotoxin penetration into building materials.
3

Szulc, Justyna, Artur Kołodziej, and Tomasz Ruman. "Silver-109/Silver/Gold Nanoparticle-Enhanced Target Surface-Assisted Laser Desorption/Ionisation Mass Spectrometry—The New Methods for an Assessment of Mycotoxin Concentration on Building Materials." Toxins 13, no. 1 (January 9, 2021): 45. http://dx.doi.org/10.3390/toxins13010045.

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This study aimed to detect and quantify mycotoxins on building materials using innovative laser mass spectroscopy methods—silver-109/silver/gold nanoparticle-enhanced target surface-assisted laser desorption/ionisation mass spectrometry (109AgNPs, AgNPs and AuNPs SALDI). Results from SALDI-type methods were also compared with commonly used matrix-assisted laser desorption/ionization (MALDI) mass spectrometry. Standards of seven moulds mycotoxin in a final concentration of 100 µg/mL for patulin, citrinin, 3-nitropropionic acid, alternariol and 20 µg/mL for sterigmatocystin, cyclopiazonic acid, roquefortine C in the mixture were tested in pure solutions and after extraction from the plasterboards. Among the studied SALDI-type method, the lowest detection limits and the highest signal intensity of the mycotoxins tested were obtained with the use of 109AgNPs SALDI MS. The 109AgNPs method may be considered as an alternative to the currently most frequently used method MALDI MS and also liquid chromatography tandem mass spectrometry LC-MS/MS for mycotoxin determination. Future studies should attempt to use these methods for mass spectrometry imaging (MSI) to evaluate spatial distribution and depth of mycotoxin penetration into building materials.
4

Liu, Chang, Lin, Liou, and Kuo. "High-Performance Sample Substrate of Gold Nanoparticle Multilayers for Surface-Assisted Laser Desorption/Ionization Mass Spectrometry." Nanomaterials 9, no. 8 (July 27, 2019): 1078. http://dx.doi.org/10.3390/nano9081078.

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The development of a sample substrate with superior performance for desorption and ionization of analyte is the key issue to ameliorate the quality of mass spectra for measurements of small molecules in surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS). Herein, the homogeneous sample substrate of gold nanoparticle multilayers (AuNPs-ML) with hexagonal lattice was successfully prepared by self-assembly technique. With strong surface plasmon resonance absorption and superior photothermal effect, the sample substrate of AuNPs-ML exhibited high signal sensitivity and low background noise for the detection of model analyte of glucose without additional matrixes in SALDI-MS. Furthermore, compared to merchant matrixes of α-cyano-4-hydroxycinnamic acid (CHCA) and 2,5-dihydroxybenzoic acid (DHB), the sample substrate of AuNPs-ML was demonstrated to ameliorate the quality of mass spectra, including signal strength, background interference and signal/noise (S/N) ratio. The sucrose and tryptophan were also measured to show the extensive applications of AuNPs-ML sample substrate for the detections of small molecules in SALDI-MS. Most importantly, the remarkable reproducibility of glucose mass spectra with relative signal of 7.3% was obtained by the use of AuNPs-ML sample substrate for SALDI-MS. The homogeneous sample substrate of AuNPs-ML greatly improved the quality of mass spectra because of its strong absorption of laser energy, low specific heat, high heat conductivity and extraordinary homogeneity. We believe that AuNPs-ML could be a practical sample substrate for small molecule detection in SALDI-MS.
5

Gorbunov, A. Yu, I. M. Zorin, S. K. Ilyushonok, A. A. Bardin, O. A. Keltsieva, N. V. Krasnov, V. N. Babakov, and E. P. Podolskaya. "Application of MALDI target electrophoretically modified with TiO2 for mass spectrometry with surface-assisted laser desorpion / ionization." NAUCHNOE PRIBOROSTROENIE 31, no. 1 (February 19, 2021): 44–58. http://dx.doi.org/10.18358/np-31-1-i4458.

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In this investigation, parameters of electrophoretic deposition (EPO) of TiO2 nanoparticles on stainless steel substrate have been optimized. The obtained coating was used as ion emitter during surface-assisted laser desorpion/ionization (SALDI). Herein, we demonstrate the high efficiency of obtained coatings for SALDI of amiodarone with subsequent Fourier transform ion cyclotron resonance mass spectrometry. Additional modification of coatings with polydimethylsiloxane (PDMS) allowed to significantly improve the sensitivity of SALDI-MS analysis.
6

Kim, Noori, Yoon-Hee Kim, Gaon Jo, Jin Yoo, Seung-min Park, Bong-Hyun Jun, and Woon-Seok Yeo. "Efficient Analysis of Small Molecules via Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (LDI–TOF MS) Using Gold Nanoshells with Nanogaps." Nanomaterials 14, no. 1 (December 21, 2023): 25. http://dx.doi.org/10.3390/nano14010025.

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Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI–TOF MS) is a commonly used technique for analyzing large biomolecules. However, the utilization of organic matrices limits the small-molecule analysis because of the interferences in the low-mass region and the reproducibility issues. To overcome these limitations, a surface-assisted laser desorption/ionization (SALDI), which utilizes nanostructured metallic surfaces, has been developed. Herein, a novel approach for SALDI–MS was proposed using silica@gold core–shell hybrid materials with a nanogap-rich shell (SiO2@Au NGS), which is an emerging material due to its excellent heat-generating capabilities. The gold shell thickness was controlled by adjusting the concentration of gold precursor for the growth of gold nanoparticles. SALDI-MS measurements were performed on a layer formed by drop-casting a mixture of SiO2@Au NGS and analytes. At the optimized process, the gold shell thickness was observed to be 17.2 nm, which showed the highest absorbance. Based on the enhanced SALDI capability, SiO2@Au NGS was utilized to detect various small molecules, including amino acids, sugars, and flavonoids, and the ionization softness was confirmed with a survival yield upon fragmentation. The limits of detection, reproducibility, and salt tolerance of SiO2@Au NGS demonstrate its potential as an effective and reliable SALDI material for small-molecule analyses.
7

Tang, Junchao, Yulin Shen, and Xu Xu. "Application of Iron Oxide Nanoparticles in the Surface-Assisted Laser Desorption and Ionization–Mass Spectrometry of Small-Molecule Compounds." Science of Advanced Materials 14, no. 12 (December 1, 2022): 1851–59. http://dx.doi.org/10.1166/sam.2022.4387.

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Iron oxide nanoparticles were applied to the surface-assisted laser desorption and ionization–mass spectrometry (SALDI–MS) of small-molecule compounds, such as oligosaccharides, phytohormones, flavonoids, triglycerides, phospholipids, and amino acids. The spatial distribution of small-molecule compounds in soybean was further studied by using imaging mass spectrometry. After different preparation methods were compared, iron oxide nanoparticles calcined at 300 °C were selected. Results showed that in SALDI–MS analysis, iron oxide nanoparticles were characterized by good stability and low background noise. Analysis was performed in the positive ion mode at the laser energy of 70% with the average spectrum accumulated 30 times. The results showed that iron oxide nanoparticles had good repeatability and sensitivity in the analysis of the abovementioned small-molecule compounds. Four samples, namely, sucrose, abscisic acid, DL-aspartic acid, and 1,2-dipalmitoyl-sn-glycerol-3-phosphorylcholine, were analyzed via SALDI–MS. The spot-to-spot repeatability RSD was less than 2.8%, and the interpoint repeatability RSD was less than 5.2%. The linear correlation coefficient of the four samples was R2 > 0.993 within the concentration range of 0.05–1.0 mg/mL. On the basis of these results, the distribution of small-molecule components in soybean cotyledon, radicle, and germ was analyzed through SALDI–MSI.
8

Krishnan, Sanduru Thamarai, David Rudd, Rana Rahmani, E. Eduardo Antunez, Rajpreet Singh Minhas, Chandra Kirana, Guy J. Maddern, Kevin Fenix, Ehud Hauben, and Nicolas H. Voelcker. "Nanostructured Silicon Enabled HR-MS for the Label-Free Detection of Biomarkers in Colorectal Cancer Plasma Small Extracellular Vesicles." Journal of Nanotheranostics 3, no. 4 (October 4, 2022): 189–202. http://dx.doi.org/10.3390/jnt3040013.

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Despite improvements in treatment options for advanced colorectal cancer (CRC), survival outcomes are still best for patients with non-metastasised disease. Diagnostic tools to identify blood-based biomarkers and assist in CRC subtype classification could afford a means to track CRC progression and treatment response. Cancer cell-derived small extracellular vesicles (EVs) circulating in blood carry an elevated cargo of lipids and proteins that could be used as a signature of tumour suppressor/promoting events or stages leading up to and including metastasis. Here, we used pre-characterised biobanked plasma samples from surgical units, typically with a low volume (~100 µL), to generate and discover signatures of CRC-derived EVs. We employed nanostructured porous silicon (pSi) surface assisted-laser desorption/ionisation (SALDI) coupled with high-resolution mass spectrometry (HR-MS), to allow sensitive detection of low abundant analytes in plasma EVs. When applied to CRC samples, SALDI-HR-MS enabled the detection of the peptide mass fingerprint of cancer suppressor proteins, including serine/threonine phosphatases and activating-transcription factor 3. SALDI-HR-MS also allowed the detection of a spectrum of glycerophospholipids and sphingolipid signatures in metastatic CRC. We observed that lithium chloride enhanced detection sensitivity to elucidate the structure of low abundant lipids in plasma EVs. pSi SALDI can be used as an effective system for label-free and high throughput analysis of low-volume patient samples, allowing rapid and sensitive analysis for CRC classification.
9

Huang, Yu-Hui, Chia-Wei Wang, Wen-Tsen Chen, Li-Yi Chen, and Huan-Tsung Chang. "Nanomaterial based mass spectrometry of oligodeoxynucleotide–drug complexes." Analytical Methods 7, no. 15 (2015): 6360–64. http://dx.doi.org/10.1039/c5ay00990a.

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10

Tsao, Chia-Wen, Yuan-Jing Lin, Pi-Yu Chen, Yu-Liang Yang, and Say Hwa Tan. "Nanoscale silicon surface-assisted laser desorption/ionization mass spectrometry: environment stability and activation by simple vacuum oven desiccation." Analyst 141, no. 16 (2016): 4973–81. http://dx.doi.org/10.1039/c6an00659k.

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11

Kuo, Tsung-Rong, Yin-Chien Chen, Chiung-I. Wang, Tzu-Hau Shen, Hong-Yi Wang, Xi-Yu Pan, Di-Yan Wang, et al. "Highly oriented Langmuir–Blodgett film of silver cuboctahedra as an effective matrix-free sample plate for surface-assisted laser desorption/ionization mass spectrometry." Nanoscale 9, no. 31 (2017): 11119–25. http://dx.doi.org/10.1039/c7nr04098a.

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12

Niu, Hongyun, Saihua Wang, Yixin Tan, Xiaowei Song, and Yaqi Cai. "Simultaneous and direct analysis of multiple types of organic contaminants in water based on a MOF decorated with a suitable quantity of Au nanoparticles, using SALDI-TOF MS." RSC Advances 6, no. 102 (2016): 99919–23. http://dx.doi.org/10.1039/c6ra19635g.

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13

Ohta, Takayuki, Hironori Ito, Kenji Ishikawa, Hiroki Kondo, Mineo Hiramatsu, and Masaru Hori. "Atmospheric Pressure Plasma-Treated Carbon Nanowalls’ Surface-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (CNW-SALDI-MS)." C 5, no. 3 (July 18, 2019): 40. http://dx.doi.org/10.3390/c5030040.

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Carbon nanowalls (CNWs), vertically standing highly crystallizing graphene sheets, were used in the application of a surface-assisted laser desorption/ionization time-of-flight mass spectrometry (SALDI-TOF-MS). The CNW substrates solved the issues on interferences of matrix molecules and alkali metal addition ions in low-weight molecule detection. Before SALDI sample preparations, the hydrophobic CNW was treated by atmospheric pressure plasma for exposing hydrophilicity to the CNWs’ surface. Detection of water soluble amino acids, arginine, was demonstrated.
14

Li, Yafeng, Peiqi Luo, Xiaohua Cao, Huihui Liu, Jianing Wang, Jiyun Wang, Lingpeng Zhan, and Zongxiu Nie. "Enhancing surface-assisted laser desorption ionization mass spectrometry performance by integrating plasmonic hot-electron transfer effect through surface modification." Chemical Communications 55, no. 41 (2019): 5769–72. http://dx.doi.org/10.1039/c9cc02541c.

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15

Ma, Wen, Shuting Xu, Wanpeng Ai, Cheng Lin, Yu Bai, and Huwei Liu. "A flexible and multifunctional metal–organic framework as a matrix for analysis of small molecules using laser desorption/ionization mass spectrometry." Chemical Communications 55, no. 48 (2019): 6898–901. http://dx.doi.org/10.1039/c9cc02611h.

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16

Abdelhamid, Hani Nasser, and Hui-Fen Wu. "Synthesis of a highly dispersive sinapinic acid@graphene oxide (SA@GO) and its applications as a novel surface assisted laser desorption/ionization mass spectrometry for proteomics and pathogenic bacteria biosensing." Analyst 140, no. 5 (2015): 1555–65. http://dx.doi.org/10.1039/c4an02158d.

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17

Lee, Gwangbin, Sang-Eun Bae, Seong Huh, and Sangwon Cha. "Graphene oxide embedded sol–gel (GOSG) film as a SALDI MS substrate for robust metabolite fingerprinting." RSC Advances 5, no. 70 (2015): 56455–59. http://dx.doi.org/10.1039/c5ra11497g.

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18

Al-Sayed, Sara A., Mohamed O. Amin, and Entesar Al-Hetlani. "SALDI Substrate-Based FeNi Magnetic Alloy Nanoparticles for Forensic Analysis of Poisons in Human Serum." Molecules 27, no. 9 (April 23, 2022): 2720. http://dx.doi.org/10.3390/molecules27092720.

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In this study, FeNi magnetic alloy nanoparticles (MANPs) were employed for the forensic analysis of four poisons—dimethametryn, napropamide, thiodicarb, and strychnine—using surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS). FeNi MANPs were prepared via coprecipitation using two reducing agents, sodium borohydride (NaBH4) and hydrazine monohydrate (N2H4·H2O), to optimize the prepared MANPs and investigate their effect on the performance of SALDI-MS analysis. Thereafter, SALDI-MS analysis was carried out for the detection of three pesticides and a rodenticide. The prepared substrate offered sensitive detection of the targeted analytes with LOD values of 1 ng/mL, 100 pg/mL, 10 ng/mL, and 200 ng/mL for dimethametryn, napropamide, thiodicarb, and strychnine, respectively. The relative standard deviation (%RSD) values were in the range of 2.30–13.97% for the pesticides and 15–23.81% for strychnine, demonstrating the good spot-to-spot reproducibility of the FeNi substrate. Finally, the MANPs were successfully employed in the analysis of poison-spiked blood serum using a minute quantity of the sample with an LOD of 700 ng/mL dimethametryn and napropamide, 800 ng/mL thiodicarb, and 500 ng/mL strychnine. This study has great potential regarding the analysis of several poisons that may be found in human serum, which is significant in cases of self-harm.
19

Guinan, T. M., P. Kirkbride, C. B. Della Vedova, S. G. Kershaw, H. Kobus, and N. H. Voelcker. "Direct detection of illicit drugs from biological fluids by desorption/ionization mass spectrometry with nanoporous silicon microparticles." Analyst 140, no. 23 (2015): 7926–33. http://dx.doi.org/10.1039/c5an01754h.

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Surface assisted laser desorption/ionization mass spectrometry (SALDI-MS) with porous silicon microparticles was used for the all-in-one extraction and detection of illicit drugs from saliva, urine and plasma.
20

Silina, Yuliya E., Claudia Fink-Straube, Heiko Hayen, and Dietrich A. Volmer. "Analysis of fatty acids and triacylglycerides by Pd nanoparticle-assisted laser desorption/ionization mass spectrometry." Analytical Methods 7, no. 9 (2015): 3701–7. http://dx.doi.org/10.1039/c5ay00705d.

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In this study, we propose a simple and rapid technique for characterization of free fatty acids and triacylglycerides (TAG) based on palladium nanoparticular (Pd-NP) surface-assisted laser desorption/ionization (SALDI) mass spectrometry (MS).
21

Sakai, Ryusei, Hiroki Kondo, Kenji Ishikawa, Takayuki Ohta, Mineo Hiramatsu, Hiromasa Tanaka, and Masaru Hori. "Effects of High-Quality Carbon Nanowalls Ionization-Assisting Substrates on Surface-Assisted Laser Desorption/Ionization Mass Spectrometry Performance." Nanomaterials 13, no. 1 (December 23, 2022): 63. http://dx.doi.org/10.3390/nano13010063.

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Surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS) is performed using carbon nanowalls (CNWs) for ionization-assisting substrates. The CNWs (referred to as high-quality CNWs) in the present study were grown using a radical-injection plasma-enhanced chemical vapor deposition (RI-PECVD) system with the addition of oxygen in a mixture of CH4 and H2 gases. High-quality CNWs were different with respect to crystallinity and C–OH groups, while showing similar wall-to-wall distances and a wettability comparable to CNWs (referred to as normal CNWs) grown without O2. The efficiency of SALDI was tested with both parameters of ion intensity and fragmental efficiency (survival yield (SY)) using N-benzylpyridinuim chloride (N-BP-CI). At a laser fluence of 4 mJ/cm2, normal CNWs had an SY of 0.97 and an ion intensity of 0.13, while 5-sccm-O2– high-quality CNWs had an SY of 0.89 and an ion intensity of 2.55. As a result, the sensitivity for the detection of low-molecular-weight analytes was improved with the high-quality CNWs compared to the normal CNWs, while an SY of 0.89 was maintained at a low laser fluence of 4 mJ/cm2. SALDI-MS measurements available with the high-quality CNWs ionization-assisting substrate provided high ionization and SY values.
22

Zhang, Yanhao, Yuanyuan Song, Jie Wu, Ruijin Li, Di Hu, Zian Lin, and Zongwei Cai. "A magnetic covalent organic framework as an adsorbent and a new matrix for enrichment and rapid determination of PAHs and their derivatives in PM2.5 by surface-assisted laser desorption/ionization-time of flight-mass spectrometry." Chemical Communications 55, no. 26 (2019): 3745–48. http://dx.doi.org/10.1039/c9cc00384c.

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Fe3O4@COFs served as an adsorbent and new matrix for SALDI-TOF-MS analysis of PAHs and their derivatives in PM2.5 with clear background, good reproducibility and sensitivity.
23

Lim, Angelina Yimei, Jan Ma, and Yin Chiang Freddy Boey. "Development of Nanomaterials for SALDI-MS Analysis in Forensics." Advanced Materials 24, no. 30 (May 29, 2012): 4211–16. http://dx.doi.org/10.1002/adma.201200027.

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Yang, Tzu-Ling, Cheng-Liang Huang, and Chu-Ping Lee. "Utilizing AgNPt-SALDI to Classify Edible Oils by Multivariate Statistics of Triacylglycerol Profile." Molecules 26, no. 19 (September 28, 2021): 5880. http://dx.doi.org/10.3390/molecules26195880.

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Edible oils are valuable sources of nutrients, and their classification is necessary to ensure high quality, which is essential to food safety. This study reports the establishment of a rapid and straightforward SALDI-TOF MS platform used to detect triacylglycerol (TAG) in various edible oils. Silver nanoplates (AgNPts) were used to optimize the SALDI samples for high sensitivity and reproducibility of TAG signals. TAG fingerprints were combined with multivariate statistics to identify the critical features of edible oil discrimination. Eleven various edible oils were discriminated using principal component analysis (PCA). The results suggested the creation of a robust platform that can examine food adulteration and food fraud, potentially ensuring high-quality foods and agricultural products.
25

Zhou, Di, Na Song, Shuzhen Dou, Jiaqi Liu, Qiye Chen, Xiaofeng Lu, and Nan Lu. "A flexible SALDI-MS substrate for no background interference detection." Sensors and Actuators B: Chemical 351 (January 2022): 130868. http://dx.doi.org/10.1016/j.snb.2021.130868.

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26

Amini, Nahid, Mohammadreza Shariatgorji, and Gunnar Thorsén. "SALDI-MS Signal enhancement using oxidized graphitized carbon black nanoparticles." Journal of the American Society for Mass Spectrometry 20, no. 6 (June 2009): 1207–13. http://dx.doi.org/10.1016/j.jasms.2009.02.017.

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27

Roverso, Marco, Roberta Seraglia, Raghav Dogra, Denis Badocco, Silvia Pettenuzzo, Luca Cappellin, Paolo Pastore, and Sara Bogialli. "Single-Walled Carbon Nanohorns as Boosting Surface for the Analysis of Low-Molecular-Weight Compounds by SALDI-MS." International Journal of Molecular Sciences 23, no. 9 (April 30, 2022): 5027. http://dx.doi.org/10.3390/ijms23095027.

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Limits of Matrix-Assisted Laser Desorption Ionization (MALDI) mass spectrometry (MS) in the study of small molecules are due to matrix-related interfering species in the low m/z range. Single-walled carbon nanohorns (SWCNH) were here evaluated as a specific surface for the rapid analysis of amino acids and lipids by Surface-Assisted Laser Desorption Ionization (SALDI). The method was optimized for detecting twenty amino acids, mainly present as cationized species, with the [M+K]+ response generally 2-time larger than the [M+Na]+ one. The [M+Na]+/[M+K]+ signals ratio was tentatively correlated with the molecular weight, dipole moment and binding affinity, to describe the amino acids’ coordination ability. The SWCNH-based surface was also tested for analyzing triglycerides in olive oil samples, showing promising results in determining the percentage composition of fatty acids without any sample treatment. Results indicated that SWCNH is a promising substrate for the SALDI-MS analysis of low molecular weight compounds with different polarities, enlarging the analytical platforms for MALDI applications.
28

Shariatgorji, Mohammadreza, Nahid Amini, Gunnar Thorsen, Carlo Crescenzi, and Leopold L. Ilag. "μ-Trap for the SALDI-MS Screening of Organic Compounds Prior to LC/MS Analysis." Analytical Chemistry 80, no. 14 (July 2008): 5515–23. http://dx.doi.org/10.1021/ac8005186.

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29

Teng, Fei, Qunyan Zhu, Yalei Wang, Juan Du, and Nan Lu. "Enhancing reproducibility of SALDI MS detection by concentrating analytes within laser spot." Talanta 179 (March 2018): 583–87. http://dx.doi.org/10.1016/j.talanta.2017.11.056.

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30

Law, K. P., and James R. Larkin. "Recent advances in SALDI-MS techniques and their chemical and bioanalytical applications." Analytical and Bioanalytical Chemistry 399, no. 8 (August 21, 2010): 2597–622. http://dx.doi.org/10.1007/s00216-010-4063-3.

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31

Li, Ze, Yi-Wei Zhang, Yue-Long Xin, Yu Bai, Heng-Hui Zhou, and Hu-Wei Liu. "A lithium-rich composite metal oxide used as a SALDI-MS matrix for the determination of small biomolecules." Chem. Commun. 50, no. 97 (2014): 15397–99. http://dx.doi.org/10.1039/c4cc07479c.

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32

Iakab, Stefania-Alexandra, Gerard Baquer, Marta Lafuente, Maria Pilar Pina, José Luis Ramírez, Pere Ràfols, Xavier Correig-Blanchar, and María García-Altares. "SALDI-MS and SERS Multimodal Imaging: One Nanostructured Substrate to Rule Them Both." Analytical Chemistry 94, no. 6 (February 1, 2022): 2785–93. http://dx.doi.org/10.1021/acs.analchem.1c04118.

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33

Pan, Xi-Yu, Chih-Hwa Chen, Yi-Hsuan Chang, Di-Yan Wang, Yi-Cheng Lee, Chien-Chung Liou, Yu-Xian Wang, Cho-Chun Hu, and Tsung-Rong Kuo. "Osteoporosis risk assessment using multilayered gold-nanoparticle thin film via SALDI-MS measurement." Analytical and Bioanalytical Chemistry 411, no. 13 (April 1, 2019): 2793–802. http://dx.doi.org/10.1007/s00216-019-01759-5.

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34

Barros, Rodrigo M., Cínthia C. Bonatto, Marcelo H. S. Ramada, and Luciano P. Silva. "Surface-Assisted Laser Desorption/Ionization Mass Spectrometry Analysis of Latent Fingermarks Using Greenly Synthesized Silver Nanoparticles." Surfaces 6, no. 4 (October 6, 2023): 341–50. http://dx.doi.org/10.3390/surfaces6040024.

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Advances in nanotechnology have contributed to many innovative approaches in the forensic sciences, including the development of new techniques and protocols for latent fingermark detection. Among other nanomaterials, metal-based nanoparticles have been explored as suitable developers for fingermarks present on surfaces that challenge traditionally established methods. The present study explored, for the first time in the forensic science literature, the application of greenly synthesized silver nanoparticles (AgNPs) for latent fingermark surface-assisted laser desorption/ionization mass spectrometry (SALDI MS) analysis. A leaf extract of a native plant from the Cerrado biome was used for green synthesis of the AgNPs, and their hydrodynamic diameter, polydispersity index (PdI), and Zeta potential values were evaluated. Latent fingermarks were produced by three distinct donors and treated with α-CHCA matrix or AgNP suspension and were further investigated using commercial matrix assisted laser desorption/ionization (MALDI)-TOF MS equipment in the m/z range of 100–1000. Characterization results of the AgNPs indicated an average hydrodynamic diameter of 25.94 ± 0.30 nm, a PdI of 0.659 ± 0.085, and a Zeta potential of −33.4 ± 2.6 mV. The silver ions detected showed a relative intensity at least 20× higher for greenly synthesized AgNPs than for AgNO3 suspension, which may be advantageous for the detection of molecular species, especially olefins, present in forensic traces. The AgNP-based SALDI MS approach for the analysis of latent fingermarks showed intense ions at m/z 106.9, 215.8, and 322.7, referring to silver cation species that have been reported as important internal calibrants. The detection of components from endogenous and exogenous sources in latent fingermarks was achieved using the present approach. Greenly synthesized AgNPs may offer a new cost-effective, eco-friendly, and easily scaled up method for application in the chemical analysis of fingermarks.
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Sakai, Ryusei, Tomonori Ichikawa, Hiroki Kondo, Kenji Ishikawa, Naohiro Shimizu, Takayuki Ohta, Mineo Hiramatsu, and Masaru Hori. "Effects of Carbon Nanowalls (CNWs) Substrates on Soft Ionization of Low-Molecular-Weight Organic Compounds in Surface-Assisted Laser Desorption/Ionization Mass Spectrometry (SALDI-MS)." Nanomaterials 11, no. 2 (January 20, 2021): 262. http://dx.doi.org/10.3390/nano11020262.

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Carbon nanowalls (CNWs), which are vertically oriented multi-layer graphene sheets, were employed in surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS) measurements to detect low-molecular-weight organic compounds. CNWs substrates with widely different wall-to-wall distances from 142 to 467 nm were synthesized using a radical-injection plasma-enhanced chemical vapor deposition (RI-PECVD) system with nanosecond pulse biasing to a sample stage. When survival yield (SY) values of N-benzylpyridinium chloride (N-BP-Cl) were examined, which is commonly used to evaluate desorption/ionization efficiency, a narrower wall-to-wall distance presented a higher SY value. The highest SY value of 0.97 was realized at 4 mJ/cm2 for the highest-density CNWs with a wall-to-wall distance of 142 nm. The laser desorption/ionization effect of arginine, an amino acid, was also investigated. When CNWs with a narrower wall-to-wall distance were used, the signal-to-noise (SN) ratios of the arginine signals were increased, while the intensity ratios of fragment ions to arginine signals were suppressed. Therefore, the CNWs nanostructures are a powerful tool when used as a SALDI substrate for the highly efficient desorption/ionization of low-molecular-weight biomolecules.
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Arendowski, Adrian. "Matrix- and Surface-Assisted Laser Desorption/Ionization Mass Spectrometry Methods for Urological Cancer Biomarker Discovery—Metabolomics and Lipidomics Approaches." Metabolites 14, no. 3 (March 20, 2024): 173. http://dx.doi.org/10.3390/metabo14030173.

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Abstract:
Urinary tract cancers, including those of the bladder, the kidneys, and the prostate, represent over 12% of all cancers, with significant global incidence and mortality rates. The continuous challenge that these cancers present necessitates the development of innovative diagnostic and prognostic methods, such as identifying specific biomarkers indicative of cancer. Biomarkers, which can be genes, proteins, metabolites, or lipids, are vital for various clinical purposes including early detection and prognosis. Mass spectrometry (MS), particularly soft ionization techniques such as electrospray ionization (ESI) and laser desorption/ionization (LDI), has emerged as a key tool in metabolic profiling for biomarker discovery, due to its high resolution, sensitivity, and ability to analyze complex biological samples. Among the LDI techniques, matrix-assisted laser desorption/ionization (MALDI) and surface-assisted laser desorption/ionization (SALDI) should be mentioned. While MALDI methodology, which uses organic compounds as matrices, is effective for larger molecules, SALDI, based on the various types of nanoparticles and nanostructures, is preferred for smaller metabolites and lipids due to its reduced spectral interference. This study highlights the application of LDI techniques, along with mass spectrometry imaging (MSI), in identifying potential metabolic and lipid biomarkers for urological cancers, focusing on the most common bladder, kidney, and prostate cancers.
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Dou, Shuzhen, Jiaxin Lu, Qiye Chen, Chunning Chen, and Nan Lu. "High-density Si nanopillars modified with Ag nanoislands: Sensitive SALDI-MS chip for sulfonamides." Sensors and Actuators B: Chemical 364 (August 2022): 131846. http://dx.doi.org/10.1016/j.snb.2022.131846.

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Al-Hetlani, Entesar, Mohamed O. Amin, Metwally Madkour, and Bessy D'Cruz. "Forensic determination of pesticides in human serum using metal ferrites nanoparticles and SALDI-MS." Talanta 221 (January 2021): 121556. http://dx.doi.org/10.1016/j.talanta.2020.121556.

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Wang, Jing, Mingsha Jie, Haifang Li, Luyao Lin, Ziyi He, Shiqi Wang, and Jin-Ming Lin. "Gold nanoparticles modified porous silicon chip for SALDI-MS determination of glutathione in cells." Talanta 168 (June 2017): 222–29. http://dx.doi.org/10.1016/j.talanta.2017.02.041.

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Sundar, Latha, and Frederick Rowell. "Drug cross-contamination of latent fingermarks during routine powder dusting detected by SALDI TOF MS." Analytical Methods 7, no. 9 (2015): 3757–63. http://dx.doi.org/10.1039/c5ay00598a.

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Li, Ning, Shuzhen Dou, Lei Feng, Xueyun Wang, and Nan Lu. "Enriching analyte molecules on tips of superhydrophobic gold nanocones for trace detection with SALDI-MS." Talanta 205 (December 2019): 120085. http://dx.doi.org/10.1016/j.talanta.2019.06.085.

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Wang, Xian-Na, Weiwei Tang, Andrew Gordon, Hui-Ying Wang, Linru Xu, Ping Li, and Bin Li. "Porous TiO2 Film Immobilized with Gold Nanoparticles for Dual-Polarity SALDI MS Detection and Imaging." ACS Applied Materials & Interfaces 12, no. 38 (August 27, 2020): 42567–75. http://dx.doi.org/10.1021/acsami.0c12949.

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Zhu, Qunyan, Zhongshun Wang, Yalei Wang, Fei Teng, Juan Du, Shuzhen Dou, and Nan Lu. "Investigation of Surface Morphology on Ion Desorption in SALDI-MS on Tailored Silicon Nanopillar Arrays." Journal of Physical Chemistry C 124, no. 4 (January 9, 2020): 2450–57. http://dx.doi.org/10.1021/acs.jpcc.9b09520.

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Li, Min, Sifeng Mao, Shiqi Wang, Hai-Fang Li, and Jin-Ming Lin. "Chip-based SALDI-MS for rapid determination of intracellular ratios of glutathione to glutathione disulfide." Science China Chemistry 62, no. 1 (August 9, 2018): 142–50. http://dx.doi.org/10.1007/s11426-018-9327-7.

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Liu, Qiang, Yongsheng Xiao, Coral Pagan-Miranda, Yu Matthew Chiu, and Lin He. "Metabolite imaging using matrix-enhanced surface-assisted laser desorption/ionization mass spectrometry (ME-SALDI-MS)." Journal of the American Society for Mass Spectrometry 20, no. 1 (January 2009): 80–88. http://dx.doi.org/10.1016/j.jasms.2008.09.011.

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Aminlashgari, Nina, and Minna Hakkarainen. "Surface Assisted Laser Desorption Ionization-Mass Spectrometry (SALDI-MS) for Analysis of Polyester Degradation Products." Journal of The American Society for Mass Spectrometry 23, no. 6 (March 3, 2012): 1071–76. http://dx.doi.org/10.1007/s13361-012-0360-8.

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Dou, Shuzhen, Zhongshun Wang, Qiye Chen, and Nan Lu. "One-step fabrication of high-density Si nanotips as SALDI-MS substrate for highly sensitive detection." Sensors and Actuators B: Chemical 359 (May 2022): 131578. http://dx.doi.org/10.1016/j.snb.2022.131578.

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Juang, Yu-Min, Han-Ju Chien, Chao-Jung Chen, and Chien-Chen Lai. "Graphene flakes enhance the detection of TiO2-enriched catechins by SALDI-MS after microwave-assisted enrichment." Talanta 153 (June 2016): 347–52. http://dx.doi.org/10.1016/j.talanta.2016.03.001.

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Zhu, Qunyan, Fei Teng, Zhongshun Wang, Yalei Wang, and Nan Lu. "Confining analyte droplets on visible Si pillars for improving reproducibility and sensitivity of SALDI-TOF MS." Analytical and Bioanalytical Chemistry 411, no. 6 (January 9, 2019): 1135–42. http://dx.doi.org/10.1007/s00216-018-01565-5.

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Duan, Jicheng, Hui Wang, and Quan Cheng. "On-Plate Desalting and SALDI-MS Analysis of Peptides with Hydrophobic Silicate Nanofilms on a Gold Substrate." Analytical Chemistry 82, no. 22 (November 15, 2010): 9211–20. http://dx.doi.org/10.1021/ac102262m.

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