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Статті в журналах з теми "Fluorescence properties"

Автор: Grafiati

Опубліковано: 20 квітня 2024

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1

Li, Yanlei, Yi Cai, Zhe Yang, Haiyan Chen, Zhanying Zhang, Dongsheng Yu, Weikai Fang, Yanfei Wang, and Chidong Xu. "Comparison of the Fluorescence Properties of Biological Solutions and Aerosols." International Journal of Engineering and Technology 15, no. 3 (August 2023): 115–18. http://dx.doi.org/10.7763/ijet.2023.v15.1231.

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The identification of biological aerosols is a subject of worldwide interest because of the potential for biological terrorism and the increase in public health emergencies. Laser-induced fluorescence is widely used to investigate the fluorescence properties of biomolecules and spores in solution; however, data on the fluorescence properties of the aerosolized forms are lacking. In this study, we report the fluorescence properties of tryptophan, serotonin, tyrosine, vitamin B6, and Bacillus thuringiensis and Bacillus subtilis spores in solution and aerosol form. Our results show that the shapes of the fluorescence spectra were generally consistent between the solution and aerosol states despite some wavelength shifts in the emission spectra. In contrast, the fluorescence intensity of the emissions varied significantly between the solutions and aerosols. Given the growing global interest in accurate measurement of airborne biological molecules and particles, our findings provide a useful baseline for further research into the development of laser-induced fluorescence-based bioaerosol detection instruments and can guide the ongoing design of effective measurement and engineering technologies.

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2

Amteghy, Ali H. "Synthesis, Fluorescence and Thermal Properties of Some Benzidine Schiff Base." NeuroQuantology 20, no. 3 (March 26, 2022): 135–49. http://dx.doi.org/10.14704/nq.2022.20.3.nq22053.

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A series of Schiff bases derived from benzidine and various aromatic aldehydes were prepared and characterized by spectroscopic methods. Fluorescence properties of prepared Schiff bases were studied in DMF solution. The thermo kinetic parameters. E, Δ H, Δ S and Δ G were calculated following Coats-Redfern method.

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3

Das, Joydip, Rosalie K. Crouch, and Parkson Lee-Gau Chong. "Fluorescence Properties of Pyrylretinol." Photochemistry and Photobiology 72, no. 3 (May 1, 2007): 415–20. http://dx.doi.org/10.1562/0031-8655(2000)0720415fpop2.0.co2.

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4

Das, Joydip, Rosalie K. Crouch, and Parkson Lee-Gau Chong. "Fluorescence Properties of Pyrylretinol." Photochemistry and Photobiology 72, no. 3 (2000): 415. http://dx.doi.org/10.1562/0031-8655(2000)072<0415:fpop>2.0.co;2.

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5

Nakashima, Nobuaki, Stephen R. Meech, Andrew R. Auty, Anita C. Jones, and David Phillips. "Fluorescence properties of ergosterol." Journal of Photochemistry 30, no. 2 (August 1985): 207–14. http://dx.doi.org/10.1016/0047-2670(85)85025-5.

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6

Ren, Pan Pan, Ren Jie Wang, and Shou Zhi Pu. "Photochromism Properties of a New Unsymmetrical Diarylethene Bearing a Benzene Unit." Advanced Materials Research 830 (October 2013): 266–69. http://dx.doi.org/10.4028/www.scientific.net/amr.830.266.

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A new photochromic diarylethene compound 1-[(2-methyl-5-(4-trifluoromethyphenyl)-3-thienyl)]-2-{2-methyl-5-[2-(1,3-dioxolane)]-3-thienyl} perfluorocyclopentene 1O was synthesized. Its optoelectronic properties, such as photochromism in solution as well as in poly-methylmethacrylate (PMMA) amorphous films, fluorescences switch were investigated in detail. Upon irradiated UV light it changes from colorless to purple in solution and PMMA amorphous film, respectively. Finally, the diarylethene 1O was exhibited remarkable fluorescence switch properties along with the cyclization reactions. When the concentration arrived at 1 × 10-5 mol L-1, the fluorescence peak had the maximum.

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7

Chen Maofu, 陈茂福, 吴静 Wu Jing, 律严励 Lü Yanli, and 陈庆俊 Chen Qingjun. "Fluorescence Properties of Municipal Wastewater." Acta Optica Sinica 28, no. 3 (2008): 578–82. http://dx.doi.org/10.3788/aos20082803.0578.

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8

Leung, A. F., L. Hayashibara, and J. Spadaro. "Fluorescence properties of uranyl nitrates." Journal of Physics and Chemistry of Solids 60, no. 3 (March 1999): 299–304. http://dx.doi.org/10.1016/s0022-3697(98)00294-7.

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9

Nutiu, Razvan, and Yingfu Li. "Aptamers with fluorescence-signaling properties." Methods 37, no. 1 (September 2005): 16–25. http://dx.doi.org/10.1016/j.ymeth.2005.07.001.

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10

Anstead, Gregory M., and John A. Katzenellenbogen. "Fluorescence properties of 2,3-diarylindenes." Journal of Physical Chemistry 92, no. 22 (November 1988): 6249–58. http://dx.doi.org/10.1021/j100333a017.

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11

Wolfbeis, Otto S., Monowara Begum, and Hans Geiger. "The fluorescence properties of luteolines." Monatshefte f�r Chemie Chemical Monthly 118, no. 12 (December 1987): 1403–11. http://dx.doi.org/10.1007/bf00810645.

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12

Gupta, Iti, and M. Ravikanth. "Fluorescence properties of meso-tetrafurylporphyrins." Journal of Chemical Sciences 117, no. 2 (March 2005): 161–66. http://dx.doi.org/10.1007/bf03356111.

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13

Kapinus, E. I. "Fluorescence properties of nanosized sulfides." Russian Journal of Physical Chemistry A 85, no. 4 (March 11, 2011): 668–71. http://dx.doi.org/10.1134/s003602441104011x.

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14

Macías, Pedro, Rosario Zamora, M. Carmen Pinto, and Carlos Gutiérrez-Merino. "Comparative fluorescence properties of lipoxygenases." Comparative Biochemistry and Physiology Part B: Comparative Biochemistry 89, no. 3 (January 1988): 531–37. http://dx.doi.org/10.1016/0305-0491(88)90170-8.

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15

Birch, D. J. S., G. Hungerford, R. E. Imhof, and A. S. Holmes. "The fluorescence properties of DCM." Chemical Physics Letters 178, no. 2-3 (March 1991): 177–84. http://dx.doi.org/10.1016/0009-2614(91)87053-e.

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16

Farkas, É., M. Hilbert, I. Ketskeméty, and L. Gáti. "Fluorescence properties of bichromophoric molecules." Spectrochimica Acta Part A: Molecular Spectroscopy 48, no. 1 (January 1992): 95–99. http://dx.doi.org/10.1016/0584-8539(92)80202-8.

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17

Yan, Qicheng, Ziyuan Liu, and Ying Guo. "Study on Fluorescence Properties of Green-Blue Apatite." Crystals 12, no. 6 (June 19, 2022): 866. http://dx.doi.org/10.3390/cryst12060866.

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Анотація:

The fluorescence phenomenon of apatite is an important feature. In this paper, three apatites with uniform transition from green to blue were selected, and the fluorescence color characteristics of the samples were observed under UV fluorescent lamp and DiamondView. With 3D fluorescence technology, combined with LA-ICP-MS, this paper aims to comprehensively test the fluorescence phenomenon of apatite to explore the relationship between apatite fluorescence and elements and analyze the fluorescence color characteristics. With the experiments mentioned above, this paper explores the fluorescent color characteristics of gemstones and their influencing factors to improve the color system of apatite. UV and DiamondView experiments show that with the change from green to blue, apatites show weak purple–red to strong pink–purple fluorescence. The 3D fluorescence test shows that the samples have two notable fluorescence emission peaks: (1) The fluorescence peak group composed of the double fluorescence peaks around 600 nm is generated by the excitation light source at 450 and 470 nm and a weaker fluorescence peak generated by the excitation at 400 nm; (2) The fluorescence emission peak of the sample gradually becomes prominent and the intensity increases significantly near the areas where the excitation wavelength is 280–330 nm and where the emission wavelength is 380 nm. According to the LA-ICP-MS test combined with the element properties, the fluorescence peak group (1) is mainly affected by Mn2+, Sm3+, and Pr3+, which emit orange fluorescence. The fluorescence emission peak (2) is caused by Ce3+, Eu3+, Dy3+, and Tb3+, which emit purple fluorescence. The mixing of the two fluorescent colors results in violet–pink fluorescence.

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18

Bakalova, Sn, L. Biczók, I. Kavrakova, and T. Bérces. "Photophysical and Photochemical Properties of 2,3-Dihydro-4(l H)-quinolinones. Part I. Fluorescence Properties." Zeitschrift für Naturforschung C 45, no. 9-10 (October 1, 1990): 980–86. http://dx.doi.org/10.1515/znc-1990-9-1009.

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Анотація:

Abstract Absorption spectra and fluorescence properties of 2,3-dihydro-4(1 H)-quinolinone derivatives were studied at room temperature in different solvents. It has been found that the fluorescence quantum yields and fluorescence decay times strongly depend on the molecular structure and solvent polarity. The character and the energy of excited states were determined by PPP and CNDO/S quantum-chemical calculations.

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19

Van, Nguyen Thi Khanh, Nguyen Dinh Hoang, Nguyen Thanh Binh, Nguyen Cong Thanh, and Pham Kim Binh. "Fluorescent Properties of Cancerous Liver Tissue." Communications in Physics 24, no. 3S2 (October 6, 2014): 130–34. http://dx.doi.org/10.15625/0868-3166/24/3s2/5058.

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Fluorescence spectroscopy is a technology used fruitfully for biomedical diagnostics as well as for therapeutic purposes. The fluorescent analysis method are applied in biomedical diagnosticsbases on fluorescence of endogenous or exogenous fluorophores. We initially applied fluorescence spectroscopy for the study of human liver cancer (hepatocellular carcinoma) with an exogenous fluorophores, Radachlorin\(^{\circledR }\) 0.35%. The main aim of this study is to determine the spectral variation between normal and malignant liver tissues in 2 cases: the samples expose and non-expose to Radachlorin. The excitation wavelength used for the fluorescence measurements is 405 nm.

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20

Li, Renjie, Junyuan Li, Jiangtao Shi, Yongyue Zhang, Yuxin Sun, Yuxi Chen, and Zhipeng Liu. "Fluorescence Properties of Pterocarpus Wood Extract." Forests 14, no. 6 (May 25, 2023): 1094. http://dx.doi.org/10.3390/f14061094.

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Анотація:

The water immersion of Pterocarpus wood produces strong blue fluorescence, which comes from the extract. The fluorescence contained in the extract is of interest for the identification of Pterocarpus wood. We conducted an investigation into the extraction solution of Pterocarpus wood and analyzed the mechanism of fluorescence in this species. Possible species of the fluorescent molecules are discussed based on the mixture. Liquid chromatography mass spectrometry (LC-MS) is used for an analysis of the extract, the obtained substances that may be fluorescent in Pterocarpus wood. In addition, the change in the fluorescence intensity with changes in the pH and concentration in the extract is also studied. The results show that the fluorescent molecule is quenched by aggregation (Aggregation-Caused Quenching; ACQ) and is unstable in over-acidic and over-alkaline conditions (especially acidic).

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21

Diac, Andreea Petronela, Ana-Maria Ţepeş, Albert Soran, Ion Grosu, Anamaria Terec, Jean Roncali, and Elena Bogdan. "Indenopyrans – synthesis and photoluminescence properties." Beilstein Journal of Organic Chemistry 12 (April 27, 2016): 825–34. http://dx.doi.org/10.3762/bjoc.12.81.

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New indeno[1,2-c]pyran-3-ones bearing different substituents at the pyran moiety were synthesized and their photophysical properties were investigated. In solution all compounds were found to be blue emitters and the trans isomers exhibited significantly higher fluorescence quantum yields (relative to 9,10-diphenylanthracene) as compared to the corresponding cis isomers. The solid-state fluorescence spectra revealed an important red shift of λmax due to intermolecular interactions in the lattice, along with an emission-band broadening, as compared to the solution fluorescence spectra.

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22

Ibrayev, N. Kh. "HOTOVOLTAIC PROPERTIES OF FUNCTIONALIZED INDODICARBOCYANINE DYE." Eurasian Physical Technical Journal 19, no. 3 (41) (September 22, 2022): 55–59. http://dx.doi.org/10.31489/2022no3/55-59.

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The effect of the chemical structure of polymethine dyes on their spectral-luminescent and photovoltaic properties has been studied. It has been shown that the introduction of hydroxyl functional groups into the dye structure leads to a bathochromic shift of the absorption and fluorescence bands. During the adsorption of dyes on the surface of titanium dioxide, a shift of their spectra to the red wavelength region was recorded with a simultaneous broadening of the bands caused by dye aggregation on the semiconductor surface. A decrease in the lifetimes of the excited state of molecules by 64 and 30% was registered for dyes 1 and 2, respectively. Quenching of the fluorescence lifetimes of adsorbed molecules is the result of electron transfer from the dye to the semiconductor. Measurements of the photovoltaic parameters of the studied dye-sensitized solar cells showed a higher efficiency for the functionalized dye, which is associated with better adsorption of this compound on TiO2

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23

SHIMONO, Isao, Takumi TAKAMURA, and Motokazu NISHINO. "Fluorescence Properties of Firing Scallop Shell." Journal of the Ceramic Society of Japan 112, no. 1303 (2004): 184–88. http://dx.doi.org/10.2109/jcersj.112.184.

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24

Kovář, Jan, Karel Šimek, Eva Kožoušková, Hana Klukanová, and Jiří Slavík. "Fluorescence properties of some isoquinoline alkaloids." Collection of Czechoslovak Chemical Communications 50, no. 6 (1985): 1312–28. http://dx.doi.org/10.1135/cccc19851312.

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The fluorescence properties of 28 isoquinoline alkaloids have been investigated. In most of them the chromophore responsible for fluorescence was the benzene ring with electron-donor substituents containing oxygen. The long-wave excitation peak practically coincides with the long-wave absorption peak of these substances, covering the region from 284 to 293 nm, the maximum emission being in the range 320-332 nm. With alkaloids having a number of conjugated rings, both excitation and emission were observed at higher wavelengths. Only protoberberine alkaloids behaved as hydrophobic probes, i.e. transfer of these compounds into a less polar medium produced a marked hypsochromic shift and a higher intensity of emission. The effect of polarity on the behaviour of tetrahydroprotoberberines, protopines, pavinanes, aporphines and benzophenanthridines was not so pronounced. Changes of pH manifested themselves most markedly in compounds with dissociable hydroxyl groups; the majority of phenolates did not fluoresce.The phenol group pK values of these compounds in the excited state were lower than in the ground state (which ranged between 8.4 and 10.4). The relations between the apparent pK, determined from fluorescence data, and the pK's of these compounds in the ground and the excited states are discussed.

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25

Fujitsuka, Mamoru, Dae Won Cho, Joji Ohshita, Atsutaka Kunai, and Tetsuro Majima. "Fluorescence Properties of Si-Linked Oligothiophenes." Journal of Physical Chemistry C 111, no. 5 (February 2007): 1993–98. http://dx.doi.org/10.1021/jp066336y.

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26

Yu, F. P., D. R. Yuan, L. M. Kong, X. L. Duan, S. Y. Guo, X. Q. Wang, and X. Zhao. "Fluorescence properties of Dy3+doped La3Ga5.5Nb0.5O14nanocrystals." Nanotechnology 19, no. 4 (January 4, 2008): 045705. http://dx.doi.org/10.1088/0957-4484/19/04/045705.

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27

Gao, Ming, Xiqi Feng, Guanqin Hu, and Zhiwen Yin. "Fluorescence Properties of Nd:CeF 3 Crystals." Chinese Physics Letters 11, no. 7 (July 1994): 451–53. http://dx.doi.org/10.1088/0256-307x/11/7/014.

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28

Zhang, Fang, Yan Fang, and Xiaoling Zhang. "Fluorescence emission properties of C60 nanoparticles." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 106 (April 2013): 242–46. http://dx.doi.org/10.1016/j.saa.2013.01.004.

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29

Jian, Zhu, Huang Liqing, Wang Yongchang, and Lu Yimin. "Fluorescence spectrum properties of gold nanochains." Physica E: Low-dimensional Systems and Nanostructures 25, no. 1 (October 2004): 114–18. http://dx.doi.org/10.1016/j.physe.2004.06.058.

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30

Perna, G., G. Palazzo, A. Mallardi, and V. Capozzi. "Fluorescence properties of natural eumelanin biopolymer." Journal of Luminescence 131, no. 8 (August 2011): 1584–88. http://dx.doi.org/10.1016/j.jlumin.2011.03.055.

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31

Endo, T., A. Shibuya, T. Sato, and M. Shimada. "Synthesis and fluorescence properties of Tb2Te4O11." Journal of Solid State Chemistry 78, no. 2 (February 1989): 237–41. http://dx.doi.org/10.1016/0022-4596(89)90103-5.

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32

Oliveira-Campos, Ana M. F., Lígia M. Rodrigues, Ana P. Esteves, Marília E. Silva, Aravind Sivasubramanian, Radim Hrdina, Graça M. B. Soares, Tiago A. D. Pinto, and Oldrich Machalicky. "Naphthotriazole derivatives: Synthesis and fluorescence properties." Dyes and Pigments 87, no. 3 (November 2010): 188–93. http://dx.doi.org/10.1016/j.dyepig.2010.03.025.

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33

Tomin, V. I., and R. Jaworski. "Multiband fluorescence spectral properties of QMOM." Russian Journal of Physical Chemistry A 85, no. 2 (January 9, 2011): 254–59. http://dx.doi.org/10.1134/s0036024411020348.

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34

Nordlund, T. M., R. Rigler, C. Glemarec, J. C. Wu, H. Bazin, G. Remaud, and J. Chattopadhyaya. "Fluorescence Properties of Y-Nucleoside Derivatives." Nucleosides and Nucleotides 7, no. 5-6 (October 1988): 805–11. http://dx.doi.org/10.1080/07328318808056334.

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35

Haroutounian, Serkos A., and John A. Katzenellenbogen. "4′-Hydroxystyryldiazines: Synthesis and fluorescence properties." Tetrahedron 51, no. 6 (February 1995): 1585–98. http://dx.doi.org/10.1016/0040-4020(94)01050-a.

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36

Murakami, Hiroshi, and Takashi Kushida. "Fluorescence properties of Zn-substituted myoglobin." Journal of Luminescence 58, no. 1-6 (January 1994): 172–75. http://dx.doi.org/10.1016/0022-2313(94)90388-3.

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37

Johansson, Lennart B. Å., Julian G. Molotkovsky, and Lev D. Bergelson. "Fluorescence properties of anthrylvinyl lipid probes." Chemistry and Physics of Lipids 53, no. 2-3 (March 1990): 185–89. http://dx.doi.org/10.1016/0009-3084(90)90044-r.

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38

Sjöback, Robert, Jan Nygren, and Mikael Kubista. "Absorption and fluorescence properties of fluorescein." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 51, no. 6 (June 1995): L7—L21. http://dx.doi.org/10.1016/0584-8539(95)01421-p.

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39

Bakalova, Snezhana. "Solvent Effects on the Fluorescence Properties of Methyldihydroquinolinones." Zeitschrift für Naturforschung A 46, no. 9 (September 1, 1991): 823–28. http://dx.doi.org/10.1515/zna-1991-0913.

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Анотація:

Abstract The absorption and fluorescence spectra and the fluorescence quantum yields of two methyl-2,3- dihydro-4(1H)-quinolinones in various solvents are reported. In some solvents deuteration-induced fluorescence enhancement has been observed. The solvent effects in aprotic solvents are consistent with the general type of solvent interaction. For protic solvents, solute-solvent complexation in the excited state is suggested

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40

Yunzheng Wang, Yunzheng Wang, Bin Zhao Bin Zhao, Zhuang Zhuo Zhuang Zhuo, Jingxuan Wang Jingxuan Wang, Liqiang Zhang Liqiang Zhang, Huabing Qin Huabing Qin, and Jianzhong Chen Jianzhong Chen. "Fluorescence spectrum, thermal properties, and continuous-wave laser performance of the mixed crystal Nd:Lu0.99La0.01VO4." Chinese Optics Letters 11, no. 12 (2013): 121404–7. http://dx.doi.org/10.3788/col201311.121404.

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41

Bezkrovnaya, O. N. "Fluorescence properties of dyes for 570-800 nm lasing region in sol-gel silica." Functional materials 22, no. 4 (December 15, 2015): 450–54. http://dx.doi.org/10.15407/fm22.04.450.

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42

Rakic, Violeta, Ajda Ota, Mihaela Skrt, Milena Miljkovic, Danijela Kostic, Dusan Sokolovic та Natasa Poklar-Ulrih. "Investigation of fluorescence properties of cyanidin and cyanidin 3-o-β-glucopyranoside". Chemical Industry 69, № 2 (2015): 155–63. http://dx.doi.org/10.2298/hemind140203030r.

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Анотація:

The absorption and fluorescence emission spectra of cyanidin and cyanidin 3-O-?-glucopyranoside (Cy3Glc) at pH 5.5 in aqueous solution have been studied. The most effective fluorescence excitations of cyanidin were at the UV absorption maxima at 220 and at 230 nm and at higher wavelengths at 270 and at 280 nm. Cyanidin exhibits fluorescence emission maxima at 310 nm and in the visible range at 615 nm. For the Cy3Glc most effective fluorescence excitation was at 220 and at 230 nm and at higher wavelengths at 300 and at 310 nm. Cy3Glc has fluorescence emission spectra with the maximum at 380 nm and does not show fluorescence emission in the visible range. If compare fluorescence emission spectra of cyanidin and Cy3Glc it can be seen that fluorescence emission intensity for cyanidin is significantly higher than that for Cy3Glc. These results reveals the impact of 3-glucosidic substitution at C-3 of aglycone (to form Cy3Glc) on the significantly decrease in fluorescence emission intensity, and disappearance of the fluorescence emission in visible wavelength range.

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43

Li, Xiao Ting, Hui Li, and Shou Zhi Pu. "Photochemistry Properties of a Novel Photochromic Diarylethene Derivative." Advanced Materials Research 763 (September 2013): 74–78. http://dx.doi.org/10.4028/www.scientific.net/amr.763.74.

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Анотація:

A new unsymmetrical photochromic diarylethene, 1-[2, 4-dimethyl-5-thiazoly-2-[2-methyl-5-(3-methylphenyl)-3-thienyperfluorocyclopentene (1o) were synthesized, and its properties, such as photochromism in solution as well as in poly-methylmethacrylate (PMMA) amorphous films, and fluorescence properties were investigated in detail. The results showed the compound exhibited good photochromism in hexane solution and in PMMA amorphous film, the maxima absorption of its closed-ring isomer 1c are 492 nm and 498 nm respectively. The open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence at 465 nm in hexane solution (5 × 10-5 mol/L) when excited at 289 nm. The fluorescence intensity decreased along with the photochromism upon irradiation with 297 nm light. The fluorescence intensity of diarylethene 1o also depended on the concentration. When the concentration of diarylethene 1o in hexane increase from 1 × 10-6 mol/L to 2 × 10-4 mol/L, the fluorescence intensity of the open-ring isomer become strong first, then become weak.

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44

Kalyagin, Alexander, Lubov Antina, Alexander Ksenofontov, Elena Antina, and Mikhail Berezin. "Solvent-Dependent Fluorescence Properties of CH2-bis(BODIPY)s." International Journal of Molecular Sciences 23, no. 22 (November 19, 2022): 14402. http://dx.doi.org/10.3390/ijms232214402.

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Biocompatible luminophores based on organic dyes, which have fluorescence characteristics that are highly sensitive to the properties of the solvating medium, are of particular interest as highly sensitive, selective, and easy-to-use analytical agents. We found that BODIPY dimers (2,2′-, 2,3′-3,3′-CH2-bis(BODIPY) (1–3)) demonstrate fluorescence characteristics with a high sensitivity to the presence of polar solvents. The intense fluorescence of 1–3 in nonpolar/low-polarity solvents is dramatically quenched in polar media (acetone, DMF, and DMSO). It has been established that the main reason for CH2-bis(BODIPY) fluorescence quenching is the specific solvation of dyes by electron-donating molecules (Solv) with the formation of stable supramolecular CH2-bis(BODIPY)·2Solv structures. Using steady-state absorption and fluorescence spectroscopy, time-resolved fluorescence spectroscopy, and computational modeling, the formation mechanism, composition, and structure of CH2-bis(BODIPY)·2Solv supramolecular complexes have been substantiated, and their stability has been evaluated. The results show the promise of developing fluorescent probes based on CH2-bis(BODIPY)s for detecting toxic N/O-containing compounds in solutions.

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45

ตู้จินดา, ภูวดี. "การผลิตกระดาษอ้างอิงมาตรฐานสำหรับสอบเทียบเครื่องวัดความขาวสว่างของกระดาษชนิด Fluorescence". วารสารวิทยาศาสตร์ประยุกต์ กรมวิทยาศาสตร์บริการ 1, № 1 (7 жовтня 2022): 72–90. http://dx.doi.org/10.60136/bas.v1.2012.180.

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ค่าความขาวสว่าง (Brightness) มีความสำคัญต่ออุตสาหกรรมเยื่อและกระดาษเป็นอย่างมากเพราะเป็นค่าที่ใช้อ้างอิงในกระบวนการฟอกเยื่อและเป็นสิ่งที่มองเห็นได้ด้วยสายตา เครื่องวัดความขาวสว่างของกระดาษมีความจำเป็นจะต้องได้รับการสอบเทียบให้ถูกต้องแม่นยำอยู่เสมอ โดยใช้กระดาษอ้างอิงมาตรฐานสำหรับสอบเทียบเครื่องวัดความขาวสว่างของกระดาษ ซึ่งหนึ่งชุดประกอบด้วยกระดาษอ้างอิงมาตรฐาน 4 ชนิดคือ Fluorescence, ความขาวสว่าง 90, 70 และ 60 เพื่อให้สามารถสอบเทียบได้ครอบคลุมทุก Parameter บทความนี้กล่าวถึงการผลิตกระดาษอ้างอิงมาตรฐานชนิด Fluorescence ซึ่งใช้วิธีการผลิตตามข้อกำหนดของ ISO TC 6 (Paper, board and pulps) และ Optical Properties Authorized Laboratories (OPALs) ซึ่งเป็นห้องปฏิบัติการมาตรฐานที่ได้รับการรับรองจาก ISO TC6 กระดาษอ้างอิงมาตรฐานชนิด Fluorescence ที่ผลิตได้นั้นถูกส่งไปตรวจสอบคุณภาพกับ Technidyne Laboratory Services (TLS) ประเทศสหรัฐอเมริกา ซึ่งเป็นหนึ่งใน OPALs ตั้งแต่เดือนตุลาคม 2552 เป็นประจำทุกเดือนจนถึงปัจจุบัน ด้วยการเปรียบเทียบค่า 2 ค่าคือ ค่าความขาวสว่าง (C brightness) และค่าความขาว (D65 Whiteness) ตลอดระยะเวลาที่ทาง Technidyne Laboratory Services ตรวจสอบคุณภาพของกระดาษอ้างอิงมาตรฐานชนิด Fluorescence ที่กรมวิทยาศาสตร์บริการผลิตได้นั้น พบว่า คุณภาพโดยเฉลี่ยของกระดาษอ้างอิงมาตรฐานอยู่ในเกณฑ์ที่ยอมรับได้ คือ ทาง Technidyne Laboratory Services วัดค่าความขาวสว่าง (C brightness) ของกระดาษอ้างอิงมาตรฐานที่ส่งไปไม่แตกต่างเกิน 0.15 โดยเฉลี่ยและค่าความขาว (D65 Whiteness) ไม่แตกต่างเกิน 0.3 โดยเฉลี่ย นอกจากนั้นกระดาษอ้างอิงมาตรฐานชนิด Fluorescence ที่ผลิตได้นั้นยังถูกส่งให้ห้องปฏิบัติการของอุตสาหกรรมเยื่อและกระดาษในประเทศไทยจำนวน 13 แห่ง ทดลองใช้ตั้งแต่เดือนกุมภาพันธ์ 2553 เป็นประจำทุกเดือนด้วย

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46

Bruch, Thomas vom, and Klaus-Heinrich Röhm. "Fluorescence Properties of Hog Kidney Aminoacylase I." Zeitschrift für Naturforschung C 43, no. 9-10 (October 1, 1988): 671–78. http://dx.doi.org/10.1515/znc-1988-9-1008.

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Abstract The state of the tryptophan residues of porcine kidney aminoacylase I (EC 3.5.1.14) was investigated by fluorescence spectroscopy and chemical modification. The pH-dependence of the fluorescence emission spectrum of the enzyme indicates that its native conformation prevails between pH 6 and 9.5. Within this range, the ionization of a residue with an apparent pKa of 7.1 quenches the enzyme fluorescence by about 15%. A similar reduction of fluorescence intensity accompanies the inactivation of aminoacylase I by treatment with N-bromosuccinimide in low excess. This suggests that in both cases a single tryptophyl residue out of eight residues per subunit is affected. Quenching by iodide revealed that, in the native conformation of the enzyme, 5-6 tryptophans per subunit are accessible, while 2-3 are buried within the protein. 8-Anilinonaphthalene- L-sulfonate (ANS) is tightly bound to aminoacylase I (1 mol/mol dimer, Kd < 1 μᴍ). ANS binding does not interfere with substrate turnover; the spectroscopic properties of the aminoacylase- ANS complex are consistent with bound ANS being excited by radiationless energy transfer (RET) from buried tryptophyl residues of the enzyme.

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47

Skalski, Bohdan, Stefan Paszyc, Ryszard W. Adamiak, Ronald P. Steer, and Ronald E. Verrall. "Photophysical properties of pyridinium salts derived from purine bases." Canadian Journal of Chemistry 68, no. 12 (December 1, 1990): 2164–70. http://dx.doi.org/10.1139/v90-332.

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Анотація:

The absorption spectra, fluorescence spectra, fluorescence lifetimes, fluorescence quenching, phosphorescence spectra, phosphorescence lifetimes, and picosecond transient absorption spectra of several purinyl-pyridinium salts have been measured in several solvents at room temperature and in ethanol glasses at 77 K. It is concluded that the previously observed photochemical transformation of N-[9-(2′,3′,5′-tri-O-acetyl-β-D-ribofuranosyl)purin-6-yl]pyridinium chloride 1 into the highly fluorescent tri-O-acetylluminarosine 6 occurs via an excited triplet state. It is also shown that intersystem crossing in purinyl-pyridinium salts is induced by an intermolecular charge-transfer interaction with the counter ions. Keywords: purinyl-pyridinium salts, fluorescence, phosphorescence.

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48

Feng, Yu Chuan, and Jie Li. "Syntheses and Properties of a Symmetrical Photochromic Diarylethene." Advanced Materials Research 830 (October 2013): 254–57. http://dx.doi.org/10.4028/www.scientific.net/amr.830.254.

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Анотація:

A new photochromic diarylethene compound 1,2-(2-ethyl-3-benzofuryl) perfluorocyclopentene was synthesized. And its properties including photochromism, fluorescence both in hexane and solid films were studied. And its absorption maxima were observed at 489 nm in hexane and at 499 nm in PMMA films, respectively, upon irradiation with 313 nm UV light. The fluorescence intensity of diarylethene decreased upon irradiation with 313 nm UV light. And the fluorescence modulation efficiency was better in PMMA films than that in hexane.

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49

Aditya Khatokar, J., N. Vinay, B. Sanjay, S. Bhargava, Ajay Sudhir Bale, Tejeswini R. Kolekar, Shantanu Singh, Sunkireddy Umarani, and Shivashankar A. Huddar. "Carbon nanodots: Chemiluminescence, fluorescence and photoluminescence properties." Materials Today: Proceedings 43 (2021): 3928–31. http://dx.doi.org/10.1016/j.matpr.2021.02.582.

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50

Achyuthan, Komandoor Elayavalli, Paul David Adams, Supratim Datta, Blake Alexander Simmons, and Anup Kumar Singh. "Hitherto Unrecognized Fluorescence Properties of Coniferyl Alcohol." Molecules 15, no. 3 (March 11, 2010): 1645–67. http://dx.doi.org/10.3390/molecules15031645.

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