Tea polysaccharides as food antioxidants: An old woman’s tale?

Wang, Yali; Yu, Zujiang; Andrae‐Marobela, Kerstin; Okatch, Harriet; Xiao, Jianbo

doi:10.1016/j.foodchem.2012.09.145

Cited by 59 publications

(26 citation statements)

References 36 publications

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“…Total phenolic content of GTPS was 5.80 g GAE/100 g sample. Wang et al (2013) revealed that tea polyphenols are the major antioxidant in the crude tea polysaccharide and when only polysaccharide fractions isolated from crude polysaccharide extract, these fractions showed low antioxidant activity. Similar to their observation, GTPS in the present study showed low antioxidant activities when evaluated by FRAP and ABTS assays ( Table 2).…”

Section: Compositional Characteristics and Antioxidant Activities Of mentioning

confidence: 99%

α-Glucosidase inhibitory activities, functional properties, and safety of green tea polysaccharides as a potential source of dietary supplement

Karadağ¹,

Doğan²,

Pelvan³

et al. 2018

JFB

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Procuring valuable bioactive compounds from low quality green tea is of great interest. Green tea polysaccharides (GTPS), obtained from low quality tea leaves, were examined for their yield, monosaccharide composition, total phenolic content, antioxidant potential, and structures as well as molecular weight distribution and in vitro anti-diabetic activities. GTPS were also evaluated for their toxicity by performing cytotoxicity and genotoxicity. Additionally, 50% lethal dose (LD50) for GTPS was determined using an acute toxicity test to assess the safe use of it as a dietary supplement. Monosaccharides of GTPS were mainly composed of xylose, glucose, ribose, galactose, arabinose, and glucuronic acid. GTPS exhibited 91.86% α-glucosidase inhibition at 0.5 mg/mL concentration. The α-glucosidase inhibitory activity of GTPS was higher than that of pharmacological glucosidase inhibitor, acarbose, which exhibited only 47.86% inhibition at 2.5 mg/mL concentration. Neither cytotoxic nor no mutagenic effects were found for GTPS. The acute toxicity also showed that LD50 of GTPS was greater than 5,000 mg/kg. The present work suggests that GTPS can be considered as an anti-diabetic dietary supplement without posing any potential health risk.

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Section: Compositional Characteristics and Antioxidant Activities Of mentioning

confidence: 99%

α-Glucosidase inhibitory activities, functional properties, and safety of green tea polysaccharides as a potential source of dietary supplement

Karadağ¹,

Doğan²,

Pelvan³

et al. 2018

JFB

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show abstract

“…It is plausible to hypothesise that the bioactivities of CLTPS could be enhanced by combining with proteins as a polysaccharide-protein conjugate (Chi et al, 2015). However, there are tea polyphenols presenting in CLTPS, and tea polyphenols may show much stronger antioxidant potential than TPS (Wang et al, 2013). Indeed, tea polyphenols caused a synergistic increase in the antioxidant activity of TPS (Du et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

Polysaccharides from Chinese Liupao dark tea and their protective effect against hyperlipidemia

Mao

Wei

Teng

et al. 2017

Int J of Food Sci Tech

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Summary Polysaccharides‐rich dark tea is believed to be beneficial to health in Southeast Asian. However, the hypolipidemic effect of Chinese Liupao tea polysaccharides (CLTPS) has not been investigated. Here, the potential mechanism by which the oral administration of CLTPS affects lipid metabolism was evaluated using high‐fat diet‐induced hyperlipidemia rats. In rats supplemented with CLTPS, a suppressive effect on body weight was observed after 4 weeks of intervention. CLTPS significantly improved the levels of lipid profiles, the oxidation of lipids and antioxidant enzyme activity in a dose‐dependent manner. The cholesterol‐lowering action was paralleled by the stimulation of cholesterol converted to bile acids along with a 1.5‐fold increase in faecal excretion. Besides, the prolongation of coagulation factors and the reduction in fibrinogen content showed that CLTPS regulated the coagulation initiated through the intrinsic pathway. With current findings, CLTPS may be valuable as a natural hypolipidemic nutraceutical for human consumption.

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“…It was found that high-purity tea polysacchrides or tea pigments (such as thearubigins, theabrownins) was difficult to prepared from fermentation teas despite various separation technology employed (Kuhnert, 2010;Bhattacharya et al, 2011;Gong et al, 2010). Even if relative pure samples were isolated in some cases, their bioactivities were always weaker than the crude extracts where they derived (Wang et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

A Comparative Study on Antioxidant Activity and Inhibitory Potential against Key Enzymes Related to Type 2 Diabetes of Four Typical Teas

Kong¹,

Wu²,

Sun³

et al. 2014

JFNR

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Tea (Camellia sinensis L.) is categorized into four types depending on the degree of fermentation, which in turn affects the physicochemical properties of tea. In this work, aqueous extracts of four typical teas, named green tea, oolong tea, black tea and puerh tea, were obtained, and their chemical compositions and bioactivities including antioxidant activity and inhibition on α-amylase and α-glycosidase were compared. It was found oolong and green tea not only possessed stronger antioxidant ability in assays of DPPH, ABTS and FRAP, but also had more power on inhibition on α-amylase and α-glycosidase. Pearson correlation analysis showed tea polyphenols and catechins had significant positive correlations on α-amylase inhibition. However, caffeine was observed to have a significant negative effect on α-glycosidase inhibition. These results indicated teas with no or slight fermentation (decaffeinated was better), were suitable for diabetes.

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Tea polysaccharides as food antioxidants: An old woman’s tale?

Cited by 59 publications

References 36 publications

α-Glucosidase inhibitory activities, functional properties, and safety of green tea polysaccharides as a potential source of dietary supplement

α-Glucosidase inhibitory activities, functional properties, and safety of green tea polysaccharides as a potential source of dietary supplement

Polysaccharides from Chinese Liupao dark tea and their protective effect against hyperlipidemia

A Comparative Study on Antioxidant Activity and Inhibitory Potential against Key Enzymes Related to Type 2 Diabetes of Four Typical Teas

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