Results 271 to 280 of about 136,864 (311)

Sodium Borohydride/Chloranil-Based Assay for Quantifying Total Flavonoids

Journal of Agricultural and Food Chemistry, 2008
A novel sodium borohydride/chloranil-based (SBC) assay for quantifying total flavonoids, including flavones, flavonols, flavonones, flavononols, isoflavonoids, flavanols, and anthocyanins, has been developed. Flavonoids with a 4-carbonyl group were reduced to flavanols using sodium borohydride catalyzed with aluminum chloride.
Xiangjiu, He, Dong, Liu, Rui Hai, Liu
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Intakes of total and individual flavonoids by US adults

International Journal of Food Sciences and Nutrition, 2013
Knowing the dietary flavonoid intake of individuals and populations is the first step to clearly understand their health effects. Dietary flavonoid intake studies have been hampered by the lack of flavonoid food composition data. The objectives of this study were to estimate intakes of individual, classes and total flavonoids in the US adults; to ...
Wei, Bai, Chunyang, Wang, Cuirong, Ren
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Total Synthesis of the Flavonoid Natural Product Houttuynoid A

Journal of Natural Products, 2018
The first total synthesis of the antiviral flavonoid houttuynoid A (1) has been achieved from aryl ketone 6 and benzofuran aldehyde 5 in nine linear steps. The C6-C3-C6 structure of the flavonoid was synthesized by an I2-catalyzed oxa-Michael addition of a chalcone intermediate, generated by the Claisen-Schmidt condensation of 5 and 6.
Jie Jian, Jilin Fan, Hui Yang, Ping Lan, Manmei Li, Peijun Liu, Hao Gao, Pinghua Sun   +7 more
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Determination of total phenolic and total flavonoid contents of Jasminum grandiflorum Lin

GSC Advanced Research and Reviews, 2023
The current study was focused on the standardization & validation of hydroalcoholic extract of Jasminum grandiflorum (JG). Jasminum grandiflorum Linn. Belonging to family Oleaceae is a well-known medicinal plant. It is an Ayurveda (herbal) medicinal plant.
null Samiksha ghanshyam khudare, null Subhash R. yende, null Nidhi P. sapkal   +2 more
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First total synthesis of four natural prenylated flavonoids

Chinese Chemical Letters, 2012
Abstract A facile approach for the first total synthesis of prenylated flavonoids, (±)-abyssinone-VI-4-O-methyl ether 1, (±)-abyssinone-IV-4′-O-methyl ether 2, (±)-abyssinone-V-4′-O-methyl ether 3 and (±)-sigmoidin E 4 has been described. The key intermediate 4-hydroxy-3,5-di-(3-methylbut-2-enyl)benzaldehyde 6 was also first synthesized that features
Jin Hui Yang, Wu Biao Zuo, Dong Dong Guo, Jun Shan Luo, Wen Qian Huang   +4 more
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Quantitative determination of total flavonoids in bilberry shoots

Pharmaceutical Chemistry Journal, 2013
The main flavonoid glycoside from bilberry (Vaccinium myrtillus L.) shoots was isolated and identified preliminarily as quercetin-3-O-xyloside. Amethod for quantitative determination of flavonoids in bilberry shoots based on differential spectrophotometry at analytical wavelength 420 nm with complexation by aluminum chloride was developed.
V. A. Kurkin, T. K. Ryazanova
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[Contents of total flavonoids in Rhizoma Arisaematis].

Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica, 2003
Comparing the contents of total flavonoides of Rhizoma Arisaematis, which collected in different time, regions, different varieties and processed.Determining the contents by ultraviolet spectro-photometry.The contents were found in the following sequence: 1. the end of July, the begin of July, August, September; 2.
S S, Du, H Y, Lin, Y X, Zhou, L X, Wei
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Total Phenols and Flavonoids in Germinated Barley Using Different Solvents

Chemistry & Biodiversity, 2023
AbstractSprouts are a source of secondary metabolites as phenolic compounds. Germination and the use of solvents can affect their content. The aim of this work was to identify the total content of phenols and flavonoids in ungerminated and germinated (3, 5, and 7 days) Esmeralda and Perla barley.
Abigail, García-Castro, Alma Delia, Román-Gutiérrez, Araceli, Castañeda-Ovando, Fabiola Araceli, Guzmán-Ortiz   +3 more
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[Microwave extraction of total flavonoids in peanut skins].

Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials, 2013
To determine the optimum microwave extraction process of flavonoids in peanut skin.The effects of extraction methods, microwave irradiation time, microwave power, ethanol concentration, material-liquid ratio and extraction times on the extraction of total flavonoids in peanut skin was investigated.Based on the single factor experiments, the extraction ...
Lin-Shan, Bai, Yun, Yang, Dan-Dan, Lv
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Stembark Methanol Extract of P. americana: Total Antioxidant Capacity, Total Flavonoids Content, Total Phenolics Content and Its Flavonoids, Vitamins and Amino Acids Profile

African Journal of Sciences and Traditional Medicine
This research investigated the total antioxidant capacity, total flavonoids content, total phenolics content as well the flavonoids, vitamins and amino acids profile of stembark methanol extract of P. americana. Plant materials have been known be rich source of various medicinal active ingredients.
Gloria Omonefe Oladele, Isaac John Umaru, Janya Danjuma, Michael S. Abu, Ojochenemi E. Yakubu   +4 more
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