Добірка наукової літератури з теми "Hibiscus sabdariffa powder"

Synthetic coagulants currently used to treat dye wastewater in the water treatment industry has been found to produce large amounts of waste and is bad for the environment. The research then presents two different methods of preparing Hibiscus Sabdariffa as a natural coagulant which are direct method and freeze-drying method to possibly replace synthetic coagulant in treating dye wastewater. The two different methods of preparing natural coagulant Hibiscus Sabdariffa are compared in terms of protein retention and coagulation performance at removing dye from dye wastewater. This is to determine which method of preparation is better at preparing a Hibiscus Sabdariffa as a natural coagulant to be used in the water treatment industry. Three analysis are done to determine the optimum concentration of Hibiscus Sabdariffa powder and freeze-drying duration is based on (i) surface morphology, (ii) water solubility and (iii) water activity. Optimum concentration of Hibiscus Sabdariffa powder is 20wt% and 24-hour freeze-drying duration. Another analysis is done to compare protein retention of each methods of preparation using (iv) Fourier Transform Infrared (FTIR) spectroscopy testing. Protein in Hibiscus Sabdariffa prepared using freeze drying is completely retained based on Fourier Transform Infrared spectroscopy results. Supporting data of protein retention properties of freeze drying is proven by water activity in Hibiscus Sabdariffa powder is at 0.478 and below the 0.6 threshold value. Water activity of 0.478 means that there is not enough water content in Hibiscus Sabdariffa powder for microorganisms to grow and degrade the protein. Optimum coagulant dosage and pH value that Hibiscus Sabdariffa prepared using the two different methods best works in is determined based on two experiments called (v) effects of coagulant dosage on dye removal percentage and (vi) effect of pH value of preparation methods on colour removal percentage. Coagulation performance of both preparation methods are also determined using experiment (v) and (vi). Hibiscus Sabdariffa prepared using freeze drying has better coagulation performance with higher colour removal percentage at lower required coagulant dosage and higher dye removal percentage at varied pH values compared to direct method. As a result, freeze drying is better in terms of coagulation performance compared to direct method at preparing natural coagulant Hibiscus Sabdariffa. Coagulation performance of natural and chemical coagulant is compared using (vii) jar test comparison between natural and chemical coagulant on colour removal. This is to determine if coagulation performance of natural coagulant is comparable to chemical coagulant. Coagulation performance of natural coagulant is only slightly lower than synthetic coagulant at colour removal percentage of 91.2% compared to 92.3%. This makes the coagulation performance of natural coagulant comparable to synthetic coagulant allowing it to be an alternative to synthetic coagulant based on coagulation performance. Therefore, Life Cycle Analysis (LCA) will then be conducted to compare the better method of preparation of natural coagulant which is freeze-drying of natural coagulant Hibiscus Sabdariffa to chemical coagulant alum. Life Cycle Analysis done is to determine, evaluate and compare natural against chemical coagulant based on 3 sustainability aspects economic, environment and social aspects. This is to determine the feasibility of natural coagulant Hibiscus Sabdariffa in the water treatment industry on whether it is a possible alternative or replacement to the currently used synthetic coagulant alum. Based on Life Cycle Analysis natural coagulant is the better alternative compared to chemical coagulant based on impact towards the environment and health and well-being of society. However, the implementation of natural coagulant in the water treatment industry is still not feasible as production cost of natural coagulant is 126.86 times more expensive compared to chemical coagulant. As a result, currently Hibiscus Sabdariffa as a natural coagulant is not able to replace synthetic coagulant alum in the water treatment industry.

Contributing to the health benefits associated with the consumption of organically fortified Zobo Tea (Hibiscus sabdariffa) powder as beverage, this research have sought to contribute to knowledge via the production process of spiced Zobo Tea (Hibiscus sabdariffa) powder and its proximate content. Data were subjected to analysis of variance (ANOVA). Comparison of means was carried out by Duncan’s multiple range test Statistical analysis was performed using the statistical package for social sciences (SPSS 17.0) and the means ± SD were calculated from triplicate determinations. The result of the sensory revealed that the entire three sample have no significant differences (p<0.05) that is, they are similar in their characteristics in mean score and standard deviation in terms of all the sensory characteristics (taste, appearance, aroma, texture, overall acceptability). Meanwhile, the proximate content (ash, crude fiber, carbohydrate, protein, and moisture) of sample ZT3 (80g ZT+ 20g SP) was significantly different from ZT1 (100g ZT). Also The Microbial count (Bacillus spp, Proteus spp, Klebsiella spp and Ecoli) were conducted and the result obtained indicated that these samples may be good for beverage production. We thus recommend the consumption of organically fortified zobo tea (Hibiscus sabdariffa) powder which is an indigenous beverage product for a wide range of consumer owing to the numerous health benefits as reviewed.

The dried roselle (Hibiscus sabdariffa var. sabdariffa) calyces were studied for the extraction of anthocyanin in aqueous solution. The total anthocyanin content in dried roselle powder was found to be 310.48mg/100g of dry matter. The extraction temperature at 70°C gave the highest yield (66.69-70.61%), while at 90°C the degradation of anthocyanins occurred. The solid-liquid ratio revealed no significant effect (p>0.05), whereas the particle size showed a significant effect (p<0.05) on the extraction of anthocyanin. The yields of anthocyanin extraction for 300 and 600 μm particle powders were significantly higher (p<0.5) than that of 1180μm powder. Reduction in the particle size inversely increased the yield of anthocyanins. In conclusion, the extraction of anthocyanin from dried roselle calyces with an average particle size of 600μm using a solid-liquid ratio of 1:50 in aqueous medium with pH 7.0 at 70°C for 20min showed the maximum yield (69.84%). J. Food Sci. Technol. Nepal, Vol. 6 (66-72), 2010 DOI: http://dx.doi.org/10.3126/jfstn.v6i0.8263

Roselle flower (Hibiscus sabdariffa L.) is beneficial as an immunostimulant because of its antioxidant property. Antioxidants in roselle flower are hibiscus anthocyanin, quercetin, L-ascorbic acid and protocatechuic acid. Any potential plants for pytopharmacy should be proven beneficial and safe through preclinical and clinical trial. The purpose of this clinical trial was to determine the effect of ethanol extract of roselle (Hibiscus sabdariffa L.) to lymphocyte and CD4 cell count in healthy volunteer for 30 days. This study used pre-post treatment design. A total of 21 healthy volunteer were chosen according to inclusion and exclusion criteria and filled informed consent. Healthy volunteer were given 500 mg roselle ethanol extract powder every day for 30 days. Lymphocyte and CD4 cell count was conducted using hematology analyzer and flowcytometer. Results were analyzed using paired t test, if the distribution is not normal than Wilcoxon test will be used on 95% confidence interval. Results showed that there was no significant effect (p>0,05) of CD4 cell absolute count and there was a significant effect of CD4 percentage (p<0,05). Results on day 45 (14 days after the treatment was interrupted) showed no significant effect (p>0,05) of CD4 cell absolute count and CD4 cell percentage. The effect of CD4 cell percentage on day 31 was in normal range. This study concluded that 500 mg roselle petal ethanol extract powder (Hibiscus sabdariffa L.) given everyday for 30 days showed some effect on d increasing CD4 cell percentage.

Roselle (Hibiscus sabdariffa) was a member of Malvaceae family. Its calyxes had bright red color due to presence of anthocyanin with an excellent antioxidant property. Raw roselle (Hibiscus sabdariffa L.) calyx was highly perishable due to its high moisture content. In order to diversify products from this plant, this research evaluated the possibility of spray drying for roselle extract into dried powder for long-term consumption. We focused on the effect of sugar alcohols (mannitol, sorbitol, isomalt, xylitol, erythritol) at 8%, carrier agents (maltodextrin, gum arabic, glutinous starch, whey protein concentrate, carboxymethyl cellulose) at 12%, operating parameters of spray dryer (inlet/outlet air temperature, feed rate) on physicochemical quality (bulk density, solubility, total phenolic content, total flavonoid content, anthocyanin content) of rosselle powder. Results showed that the optimal spray drying variables for rosselle powder should be 8% isomalt, 12% whey protein concentrate, inlet/ outlet air temperature 140/85oC/oC, feed rate 12 ml/min. Based on these optimal conditions, the highest physicochemical attributes of the dried roselle calyx powder would be obtained.

Abstract Today the entire research community is looking for sustainable materials. In that process, more research is going on to utilize the natural materials as binders, fillers, reinforcement etc., to enhance the mechanical and thermal properties without affecting the nature. Numerous amount of research is carried out various regions of the world on the usage of pine, sisal, hemp, bagasse, jute, bamboo, coir as reinforcement. This study focuses on the utilization of agro waste like Roselle (Hibiscus Sabdariffa) as reinforcement material in epoxy LY 556 matrix along with different volume percentage of natural filler to form a unique bio based composite material. The composite specimens were fabricated by vacuum bag moulding method. The mechanical properties of the fabricated specimen at different compositions is studied. The maximum mechanical properties were observed for the composite with 30:70 volume percentage Hibiscus sabdariffa with epoxy resin added composition. From the results we can conclude the composite developed using Roselle powder and LY 556 epoxy would be very good alternate for various light weight material applications.

Roselle (Hibiscus sabdariffa L.) contains significant amount of anthocyanins and Vitamin C, however, these nutrients are heat sensitive and are easily degraded during heat processing. This study assessed the influence of drying methods on the physicochemical properties of roselle powders. The 80:20(extract:maltodextrin) liquid feed formulation produced the best quality spray-dried powder. Optimum parameters for spray-drying was established at inlet temperature, Ti = 173+ 1°C, outlet temperature, T0 = 73 +1°C, feed rate(R) of 10 rpm and air pressure (P) of 1.5 – 2.0 bars. Presoaking conditions anddrying methods significantly influenced the antioxidant components of the roselle extract powder. At higher water temperatures (50C° and 100°C), higher losses of anthocyanin and Vitamin C were recorded. Likewise, similar changes were observed in the oven – dried (45°C, 24h) roselle powder. Spray – dried powder had lower Aw, moisture, protein, ash and fiber contents than the oven –dried powder. This study suggested that spray –drying protects the essential nutrients anthocyanin and Vitamin C, however, degrades the proximate composition of roselle powder.

The lipid-lowering activity of microencapsulated and nonmicroencapsulated Hibiscus sabdariffa L. powder fractions in rats rendered hyperlipidemic by a hyperlipid diet (HLD) was determined. Dried calyces of H. sabdariffa were finely ground and fractionated on a sieve column to retain particle sizes ϕ < 315 µm, and were microencapsulated with maltodextrin (MD). Rats were randomly divided into four groups: normal control group, hyperlipid diet group (negative control groups), hyperlipid diet group supplemented with atorvastatin, non-microencapsulated (NMEPHS) and microencapsulated (MEPHS) powders from H. sabdariffa calyces groups. Rats received atorvastatin, NMEPHS and MEPHS for three weeks. Atorvastatin (10 mg/kg) and individual powders were dissolved in water and administered to rats at a dose of 250 mg/kg body weight for three weeks. Body weight, total cholesterol (TC), triglycerides (TG), low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), aspartate transferase (AST), alanine transferase (ALT), superoxide dismutase (SOD), catalase (CAT) and malondialdehyde (MDA) were measured. Very low-density lipoprotein cholesterol (VLDL-C), hepatosomatic index (HSI), and adiposomatic index (ASI) were calculated. Lipid profil, and MDA were increased in the negative control rat groups compared with the negative control rat group. NMEPHS and MEPHS significantly reduced body weight gain, ASI, HSI, TC, TG, LDL-C, ALT, AST, and MDA and increased HDL-C level significantly. Moreover, SOD and CAT activities were reduced with HLD and significantly increased with HSCP intake. however, the most significant activities were revealed by MEPHS. These results suggest that MEPHS exerts potent lipid-lowering effects, promotes hepatic fat breakdown, and regulates antioxidant enzymes in a more efficient manner.

The current demand for edible vegetable oil is increasing worldwide, and the development of new sources of high-quality vegetable edible oil is an essential task. There is also a huge demand for biodiesel in domestic and industrial applications, and foliage oils could be a good source for diesel applications. The current study aimed at the identification and quantification of fatty acids from commonly consumed green leafy vegetables (GLVs) viz., Hibiscus cannabinus, Hibiscus sabdariffa, Basella alba, Basella rubra, and Rumex vesicarius and to calculate the biodiesel attributes of the oil. The total oil content was ascertained as the highest in R. vesicarius foliage (3.91 ± 0.27 g/100 g dry leaf powder). GC/MS chromatographic investigation identified 9,12,15-octadecatrienoic acid as a significant compound followed by hexadecanoic acid. In Hibiscus spp. C18:3 (49.3 µmol % and 50.4 µmol %) was recorded to be the most noteworthy followed by C16:0 (23.2 µmol % and 21 µmol %) in H. cannabinus and H. sabdariffa, respectively. The GLVs foliage-fatty acid biodiesel attributes were additionally assessed through an empirical formula. Consequently, the overall examined results will be helpful for the investigation of these oils as vegetable oil for human consumption and biodiesel applications.