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A simple electrochemical procedure has been developed for determining the titratable acidity in Schisandrae Chinensis Fructus (SCF) and Schisandrae Sphenantherae Fructus (SSF) by means of reduction of quinone in the presence of acid compounds. To measure a voltammogram, a test solution was prepared by mixing a water extract from SCF or SSF and an electrolyte cocktail containing 3,5-di-tert-butyl-1,2-benzoquinone and NaCl. The quantitative results of titratable acidity in the SCF and SSF samples by the present voltammetry were in good agreement with those by neutralization titration using 0.1 M NaOH (r = 0.980): y = 1.003x + 0.010, where the y- and x-axes were the titratable acidity obtained by the present voltammetry and the neutralization titration, respectively. Further, the titratable acidities in the SSF samples were significantly lower than those in the SCF samples (p < 0.01). From these findings, we show that the titratable acidity is useful as an indicator to discriminate between SCF and SSF. Moreover, a prototype of electrochemical portable sensor for on-site analysis has been provided to perform this procedure.
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http://dx.doi.org/10.2116/analsci.20P049 | DOI Listing |
Heliyon
December 2024
Department of Food Science and Engineering, Faculty of Agriculture, University of Zanjan, Zanjan, 45371-38791, Iran.
The current research focused on examining the effect of a coating made from Balangu seed mucilage (TSM-BM) and gelatin (Ge), with varying concentrations of dill essential oil (DEO) (0 %, 1 %, and 2 %) and zinc oxide nanoparticles (ZnO-np) (0 % and 0.5 %), on the quality characteristics of cherries stored at 4 °C over intervals of 0, 4, 7, 11, 18, and 25 days. The study noted that the application of this coating, particularly when combined with DEO and ZnO-np, significantly reduced the rate of changes in several parameters, including weight loss, firmness, titratable acidity, pH, total soluble solids, ascorbic acid, total anthocyanin content, total phenolic content, and antioxidant activity (p˂0.
View Article and Find Full Text PDFHeliyon
December 2024
Laboratory for Food Science and Metabolism, Department of Biochemistry, Faculty of Science, University of Yaounde1, Cameroon.
The nutritional value of a food is linked to the quality and quantity of the nutrients it contains. It offers a major advantage in establishing a food table composition (FTC) which is a tool that provides information on the quantity of nutrients contained in a food. Furthermore, certain natural beverage are not taken into account in the FTC.
View Article and Find Full Text PDFFood Chem
December 2024
Institute for Agro-food Standards and Testing Technology, Laboratory of Quality and Safety Risk Assessment for Agro-products (Shanghai), Ministry of Agriculture, Shanghai Academy of Agricultural Sciences, 1000 Jingqi Road, Shanghai 201403, China. Electronic address:
This study aimed to analyze the effects of temperature on physicochemical properties and volatile profiles of the 'Shine Muscat' grape during postharvest storage. Fresh grapes were stored at 4 °C and 25 °C for 28 d. The salable weight and appearance-related quality were better maintained in low-temperature storage (4 °C), and grapes stored at 25 °C presented a higher total soluble solids/titratable acidity ratio (TSS/TA), total phenols, total flavonoids, and total anthocyanins during storage compared to 4 °C.
View Article and Find Full Text PDFBMC Plant Biol
December 2024
College of Horticulture, Sichuan Agricultural University, Chengdu, 611130, China.
Melatonin (MT) can improve plant resistance and fruit quality. The mechanism by which MT affects soluble sugar and organic acids accumulation in drupe fruits is not clear. In this study, 100 µmol/L MT was sprayed on the leaves of plum trees at the second stage of rapid fruit expansion (90 and 97 d after flowering), and the effects of MT on plum fruit quality and its effects on the soluble sugar-organic acid metabolism were investigated.
View Article and Find Full Text PDFHeliyon
December 2024
Department of Chemistry, Trichandra Multiple Campus, Tribhuvan University, Kathmandu, Nepal.
Citrus fruit juice is highly beneficial to human health, providing essential nutrients like carbohydrates, vitamins, phytochemicals, and antioxidants. Juices from citrus fruit varieties grown in various regions of Nepal were analyzed for their physicochemical properties, nutraceutical content, antioxidant and antimicrobial properties. The pH of the juices ranged between 2.
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