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Antioxidant Activity, Total Phenol, and Total Flavonoid of Syzygium Polyanthum
2021 IEEE International Conference on Health, Instrumentation & Measurement, and Natural Sciences (InHeNce), 2021Free radicals are molecules that have an unpaired electron in their outer orbital so they are highly reactive. Antioxidants (free radical scavenging compounds) are substances that can neutralize free radicals, or materials that function to prevent the body's biological systems from being oxidized excessively.
Loudfy Eka Widyawaty +2 more
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On the spectrophotometric determination of total phenolic and flavonoid contents
Acta Biologica Hungarica, 2013Spectrophotometric assays assessing total phenol and flavonoid content in plant samples are cheaper and faster and thus more accessible methods than analytical chromatography techniques, although these identify compound categories rather than individual compounds.
Csepregi, K. +2 more
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Intakes of total and individual flavonoids by US adults
International Journal of Food Sciences and Nutrition, 2013Knowing 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, 2018The 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 +7 more
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Progressive studies on biological activity of total flavonoids of Astragalus
China Journal of Chinese Matera Medica, 2010Progresses in the studies on chemical constituents and bioactivities of total flavonoids of Astragalus (TFA) were systemically reviewed in this article. The results of studies on their bioactivities show that TFA has antioxidant and antitumor activities, and strengthen the immune system.
Dongqing, Zhang, Deqing, Wang
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Total content of flavonoids in species of the genus heichrysum
New frontiers in natural product chemistry, 2023The genus Helichrysum (Asteraceae) comprises about 600 species of perennial or annual plants distributed in Europe, Asia, and Africa, which are an abundant source of secondary metabolites, such as flavonoids, chalcones, phenolic acids, coumarins, pyrones, and terpenes [1]. In the Republic of Moldova only one species H.
Mihaela Nartea +4 more
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Interactions between Flavonoids and Proteins: Effect on the Total Antioxidant Capacity
Journal of Agricultural and Food Chemistry, 2002Flavonoids are potent antioxidants. It is also known that flavonoids bind to proteins. The effect of the interaction between tea flavonoids and proteins on the antioxidant capacity was examined. Their separate and combined antioxidant capacities were measured with the Trolox equivalent antioxidant capacity (TEAC) assay.
Arts, M.J.T.J. +6 more
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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, 2003Comparing 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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Quantitative determination of total flavonoids in bilberry shoots
Pharmaceutical Chemistry Journal, 2013The 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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Advances in the First Total Synthesis of Natural Flavonoids
Synthetic Communications, 2013Abstract Flavonoids, composed of a C6-C3-C6 backbone, are a kind of secondary metabolites of natural medicine, which widely exist in the higher plant. They have received extensive attention from all over the world and obtained rapid development owing to widespread distribution, structural complexity, active diversity, and molecular plasticity.
Zhonglei Wang +3 more
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