Phenolic Antioxidants from Green Tea Produced from Camellia taliensis

Gao, Da‐Fang; Zhang, Yingjun; Yang, Chong‐Ren; Chen, Keke; Jiang, Hangyi

doi:10.1021/jf800878m

Cited by 57 publications

(64 citation statements)

References 24 publications

(57 reference statements)

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“…Consequently, the structure of 2 was established as 1,2-di-O-galloyl-4,6-O-(S)-hexahydroxydiphenoyl-b-Dglucose. It has been reported that this compound was isolated from Camellia taliensis 13) belonging to the section Thea of genus Camellia, Camellia oleifera, 19) and Juglans regia.…”

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confidence: 99%

“…It was also found that caffeine is the major methylxanthine in C. sinensis and C. taliensis, whereas theobromine is abundant in C. irrawadiensis. Moreover, Gao et al 13) have recently reported the identification of polyphenols (hydrolyzable tannins and catechins) and determined the major polyphenolic composition in C. taliensis.…”

Section: )mentioning

confidence: 99%

“…The major polyphenol in C. irrawadiensis was found to be 2, which has already been reported to have 1,1-diphenyl-2-picrylhydrazyl radical scavenging-effect, 15) superoxide dismutase-like activity, 15) and tyrosinase inhibitory effect. 13) Compound 1 has also been found to show antiallergic effect 16) and hair growth promotion. 17) Thus, this study will open the door to potential utilization of C. irrawadiensis as a plant material with physiological functions.…”

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confidence: 99%

“…2. The content of polyphenols and methylxanthines in the leaves of the two species together with published data of C. taliensis 10,13) are given in Table 2. Nagata and Sakai 10) have reported that leaves of C. irrawadiensis contain an abundant amount of theobromine and a trace amount of caffeine.…”

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confidence: 99%

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Identification of a Major Polyphenol and Polyphenolic Composition in Leaves of Camellia irrawadiensis

Yagi¹,

Goto²,

Nanjo³

2009

CHEMICAL & PHARMACEUTICAL BULLETIN

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Green tea, the most popular beverage in East Asia, is made from leaves of Camellia sinensis belonging to the section Thea of genus Camellia.1) It is well-known that the species C. sinensis contains catechins including epigallocatechin 3-O-gallate (EGCg), epigallocatechin (EGC), epicatechin 3-Ogallate (ECg), epicatechin (EC), gallocatechin 3-O-gallate (GCg), gallocatechin (GC), catechin 3-O-gallate (Cg), and catechin (C) as the major polyphenols, and the catechins show a variety of biological activities.2) In the tea plant, hydrolyzable tannins [for example, strictinin (1) and theogallin], proanthocyanidins, flavonol glycosides and so on are also present as minor polyphenols. [3][4][5][6][7][8][9] In addition to these polyphenols, methylxanthines such as caffeine and theobromine exist in tea, 10) and are also well-known as pharmacologically active constituents. 11)Camellia irrawadiensis and Camellia taliensis are wellknown species in section Thea.1) Nagata and Sakai 10,12) have reported the content of catechins and methylxanthines in the above species in addition to C. sinensis. According to their investigation, C. sinensis and C. taliensis contain a large amount of EGCg and ECg, while C. irrawadiensis has less amount of these catechins. It was also found that caffeine is the major methylxanthine in C. sinensis and C. taliensis, whereas theobromine is abundant in C. irrawadiensis. Moreover, Gao et al. 13) have recently reported the identification of polyphenols (hydrolyzable tannins and catechins) and determined the major polyphenolic composition in C. taliensis.Contrastively, few studies have been carried out on the polyphenols other than catechins in C. irrawadiensis. Only one study published 50 years ago, has researched the presence of polyphenols other than catechins in C. irrawadiensis. Roberts et al. 14) reported that besides theogallin, unknown polyphenols were also detected as main components in C. irrawadiensis by two-dimensional paper chromatography. Although the unknown polyphenols were presumed to be derivatives of gallic acid, their structure and content in C. irrawadiensis are still undetermined. It is important to clarify the polyphenolic composition in C. irrawadiensis in order to utilize its potential application. This paper deals with the identification of strictinin (1) and 1,2-di-O-galloyl-4,6-O-(S)-hexahydroxydiphenoyl-b-D-glucose (2) in leaves of C. irrawadiensis, and comparison of its polyphenolic composition with C. sinensis and C. taliensis. The major polyphenol in C. irrawadiensis was found to be 2, which has already been reported to have 1,1-diphenyl-2-picrylhydrazyl radical scavenging-effect, 15) superoxide dismutase-like activity, 15) and tyrosinase inhibitory effect.13) Compound 1 has also been found to show antiallergic effect 16) and hair growth promotion.17) Thus, this study will open the door to potential utilization of C. irrawadiensis as a plant material with physiological functions. Results and DiscussionAs shown in Fig. 2A, an unknown major peak (compound Identification ...

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confidence: 99%

Section: )mentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Section: )mentioning

confidence: 99%

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Identification of a Major Polyphenol and Polyphenolic Composition in Leaves of Camellia irrawadiensis

Yagi¹,

Goto²,

Nanjo³

2009

CHEMICAL & PHARMACEUTICAL BULLETIN

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“…The DPPH free radical scavenging activity was analyzed by a previously reported method (Gao et al 2008). The extract (0.1 g) was dissolved in 10 mL of 50% ethanol and diluted to 1, 2, 3, 4, and 10 mg/mL.…”

Section: Measurement Of Dpph Radical Scavenging Activitymentioning

confidence: 99%

Cost-effective Isolation of Bioactive Compounds from a Discarded Bioresource – Defatted Seeds of Camellia oleifera

Ye¹,

Li²,

Fang³

2014

BioResources

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The Camellia oleifera oil industry is the economic mainstay in many highpoverty mountain regions of China, but the defatted seeds are currently discarded, leading to a waste of bioresources. In this work, a costeffective technique was designed to isolate the flavonoid, saponins, and polysaccharides by ultrasonic-assisted acid-base alternative extraction. The activities of these compounds were evaluated by their DPPH and ABTS radical scavenging abilities in vitro and inflammatory inhibition in mice, and the economic efficiency was assessed. The optimal extraction conditions by response surface design were 1.6% HCl, water/seed ratio 16, extraction time 89 min, and ultrasonic power 310 W. The yields of the flavonoid, saponin, and polysaccharide were, respectively, 1.4 ± 0.2%, 6.7 ± 0.8%, and 22.5 ± 1.7%. The extracts could eliminate DPPH and ABTS radicals and alleviate inflammation with concentration dependence, and showed excellent capacity in the order of flavonoid ≥ saponin > polysaccharides. The residue after extraction was cellulose, with a yield of 63.0 ± 2.4%. The defatted seeds could produce a value of $11.35 per kilogram after production of the four valuable extracts, which would greatly increase the income in these high-poverty areas. This integrated extraction technique provides valuable recycling utilization of a typically discarded bioresource.

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Identifications of inhibitors of IgE production by human lymphocytes isolated from ‘Cha Chuukanbohon Nou 6’ tea leaves

Honma

Tagashira

Kanda

et al. 2009

J. Sci. Food Agric.

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Phenolic Antioxidants from Green Tea Produced from Camellia taliensis

Abstract: *A quem a correspondência deve ser enviada Flavonoids, total phenolics and antioxidant capacity: comparison between commercial green tea preparations Flavonoides, fenólicos totais e capacidade antioxidante: comparação entre bebidas comerciais à base de chá verde

Cited by 57 publications

References 24 publications

Identification of a Major Polyphenol and Polyphenolic Composition in Leaves of Camellia irrawadiensis

Identification of a Major Polyphenol and Polyphenolic Composition in Leaves of Camellia irrawadiensis

Cost-effective Isolation of Bioactive Compounds from a Discarded Bioresource – Defatted Seeds of Camellia oleifera

Identifications of inhibitors of IgE production by human lymphocytes isolated from ‘Cha Chuukanbohon Nou 6’ tea leaves

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