Flavonol Glycoside Content and Composition of Tea Infusions Made from Commercially Available Teas and Tea Products

Price, K.R.; Rhodes, M. J. C.; Barnes, Karen A.

doi:10.1021/jf9800211

Cited by 80 publications

(51 citation statements)

References 13 publications

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“…These results suggest that either kaempferol is absorbed more efficiently than quercetin, that quercetin is preferentially excreted through the bile compared with kaempferol, or that quercetin is more efficiently converted to other compounds (in the gut, or postabsorption). In tea, kaempferol and quercetin are conjugated to similar moieties (mainly rutinosides; Price et al, 1998), but in onions, quercetin is found conjugated to glucosides (Price & Rhodes, 1997). Quercetin was excreted at an average of 1.1% of intake after onion consumption compared with 0.5% after tea, suggesting that quercetin from onions is more bioavailable than from tea.…”

Section: Discussionmentioning

confidence: 99%

Absorption of kaempferol from endive, a source of kaempferol-3-glucuronide, in humans

et al. 2004

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Objective: To determine the absorption, excretion and metabolism of kaempferol in humans. Design: A pharmacokinetic study of kaempferol from endive over 24 h. Subjects: Four healthy males and four healthy females. Results: Kaempferol, from a relatively low dose (9 mg), was absorbed from endive with a mean maximum plasma concentration of 0.1 mM, at a time of 5.8 h, indicating absorption from the distal section of the small intestine and/or the colon. Although a 7.5-fold interindividual variation between the highest and lowest maximum plasma concentration was observed, most individuals showed remarkably consistent pharmacokinetic profiles. This contrasts with profiles for other flavonoids that are absorbed predominantly from the large intestine (eg rutin). An average of 1.9% of the kaempferol dose was excreted in 24 h. Most subjects also showed an early absorption peak, probably corresponding to kaempferol-3-glucoside, present at a level of 14% in the endive. Kaempferol-3-glucuronide was the major compound detected in plasma and urine. Quercetin was not detected in plasma or urine indicating a lack of phase I hydroxylation of kaempferol. Conclusions: Kaempferol is absorbed more efficiently than quercetin in humans even at low oral doses. The predominant form in plasma is a 3-glucuronide conjugate, and interindividual variation in absorption and excretion is low, suggesting that urinary kaempferol could be used as a biomarker for exposure. Sponsorship: Biotechnology and Biological Sciences Research council for core strategic funding and the University of Leeds for a departmental fellowship (AJD).

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Section: Discussionmentioning

confidence: 99%

Absorption of kaempferol from endive, a source of kaempferol-3-glucuronide, in humans

et al. 2004

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“…Tannin content of dried persimmon was analyzed according to the method described by modified Prussian Blue assay (Graham, 1992;Price et al, 1988). One hundred milliliters of sample extract was added to 3 mL of distilled water, centrifuged at 10000× g for 15 min, and supernatant was collected.…”

Section: Tannin Contentmentioning

confidence: 99%

Quality characteristics of dried persimmon (Diospyros kaki Thunb) of different fruit sizes

Cho¹,

Song²,

Cho³

et al. 2017

Afr. J. Biotechnol.

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Fruits of persimmon are considered as one of the health promoting foods which has been established as one of the major fruits in Korea. Persimmon is one of the fruits processed mainly by drying. Quality characteristics of dried persimmon prepared with different fruit sizes of cultivar Sanggandungsi were investigated. Smaller sized fruits showed significantly high weight loss as compared to bigger ones due to drying. On the other hand, bigger sized fruits possessed significantly high value for hardness after 35 days of drying. Size of fruit was not found to be vital for soluble solid contents of dried fruits. One of the important bioactive molecules of persimmon fruits (tannin content) is significantly high in bigger sized fruits as compared to smaller ones. Significant differences in various parameters among different sized fruits indicate that, physicochemical characteristics of dried persimmon fruit could be affected by the fruit size.

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“…Blue assay method (Graham, 1992;Price et al, 1988). A 0.1 ㎖ of sample extract was added to 3 ㎖ of distilled water, centrifuged at 10000 × g for 15 min, and the supernatant was After 15 min, absorbance was measured at 700 ㎚ using a spectrophotometer (HP 8452A diode-array, Hewlett-Packard Co.).…”

Section: Tannin Contentmentioning

confidence: 99%

Quality Characteristics of ‘Dongchul’ Persimmon (Diospyros kaki Thunb.) Fruit Grown in Gangwondo, Korea

Kim¹,

Dhungana²,

Chae³

et al. 2016

Korean Journal of Plant Resources

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-Persimmon has long been established as one of the major fruits in Korea. The southern parts of Korea were traditionally the pocket areas for good persimmon production; however, rising temperatures have gradually rendered the southern regions unsuitable for successful harvest. Ecology of fruit growing areas affects the productivity of various types of crops, including fruit trees such as persimmon. The quality characteristics of the fruit of persimmon cv. Dongchul grown in Gangwondo, which lies in the northern part of South Korea, were investigated. Different physicochemical, nutritional, and antioxidant properties of fruit were evaluated to assess the locational effect on the quality of persimmon fruits grown in Gangwondo. The results of this study showed that persimmon cv. Dongchul grown in Gangwondo maintains many of the physicochemical (4.33% crude protein and 4.32% crude fiber), nutritional (total mineral content: 461.51 and vitamin C content: 15.28 ㎎/100 g), and antioxidant properties (polyphenol content: 633.1 ㎎ gallic acid equivalent/100 g) those are found in other three commercial cultivars 'Daebong', 'Kyengsan Bansi', and 'Sangju Doongsi' grown in Korea. Overall results of this study imply that 'Dongchul' cultivar of persimmon could commercially be grown in Kangwondo, Korea.

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Flavonol Glycoside Content and Composition of Tea Infusions Made from Commercially Available Teas and Tea Products

Cited by 80 publications

References 13 publications

Absorption of kaempferol from endive, a source of kaempferol-3-glucuronide, in humans

Absorption of kaempferol from endive, a source of kaempferol-3-glucuronide, in humans

Quality characteristics of dried persimmon (Diospyros kaki Thunb) of different fruit sizes

Quality Characteristics of ‘Dongchul’ Persimmon (Diospyros kaki Thunb.) Fruit Grown in Gangwondo, Korea

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