Optimizing synchronous extraction and antioxidant activity evaluation of polyphenols and polysaccharides from Ya'an Tibetan tea (<i>Camellia sinensis</i>)

Zheng, Qiaoran; Li, Wenfeng; Zhang, Heng; Gao, Xueke; Tan, Si

doi:10.1002/fsn3.1331

Cited by 37 publications

(37 citation statements)

References 44 publications

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“…It can be seen from Figure 1A that when the extraction time increased, the polysaccharide yield increased and reached a maximum at 4 h, but decreased after 4h. This is because the increase in extraction time makes it easier and faster to dissolve the polysaccharides into the solvent (Lin et al, 2017), but too long extraction time will result in the destruction of polysaccharide structure (Chen et al, 2019b;Zheng et al, 2019) and competitive dissolution of other impurities (Nuerxiati et al, 2019), leading in a decrease in yield. This phenomenon was consistent with the extraction of polysaccharides in other literatures (Wang et al, 2018b;Yang et al, 2017).…”

Section: Effect Of Extraction Time On Polysaccharide Yieldmentioning

confidence: 99%

Extraction optimization and antioxidant activity of Phyllanthus urinaria polysaccharides

Liu

2021

Food Sci. Technol

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Three extraction parameters including extraction time, material to solvent ratio, and extraction temperature for the extraction yield of Phyllanthus urinaria polysaccharides were optimized by response surface methodology. The results revealed that the optimal extraction process was extraction time of 5.3 h, extraction temperature of 93 °C, and material to solvent ratio of 1:47 g/mL, under which the polysaccharide yield was 6.40%; The three parameters had significant effect on the polysaccharide yield, and the influence of extraction time was the greatest and that of extraction temperature was the lowest. The antioxidant activity test indicated that the equivalent scavenging ability of Phyllanthus urinaria polysaccharides on DPPH and ABTS free radicals was 0.88 and 0.84 μg TBHQ/μg of polysaccharides, respectively; while the reducing power and total antioxidant capacity of Phyllanthus urinaria polysaccharides was equivalent to 93.62% and 93.55% of TBHQ, respectively. The Phyllanthus urinaria polysaccharides had good antioxidant activity.

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Section: Effect Of Extraction Time On Polysaccharide Yieldmentioning

confidence: 99%

Extraction optimization and antioxidant activity of Phyllanthus urinaria polysaccharides

Liu

2021

Food Sci. Technol

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“…sinensis and C. sinensis var. assamica (Masters) Wight [9,13]; their characteristics (i.e., appearance, organoleptic taste, chemical contents, and flavor) vary according to the fermentation level: tea can be categorized in nonfermented tea (i.e., green tea, and white tea), semifermented tea (i.e., oolong tea), and fermented tea (i.e., black tea and red tea) [5,6,9,[14][15][16][17]. The 78% of the tea worldwide production is black tea, especially consumed in Western countries, 20% consists of green tea, which is usually consumed in Asian countries, and 2% regards Oolong tea, commonly consumed in southern China [14].…”

Section: Introductionmentioning

confidence: 99%

“…Due to its chemical constituents, tea shows many beneficial properties, such as antioxidant, anti-inflammatory, antiallergic, anticarcinogenic, antidiabetic, and antimicrobial effects [6,7,9,14,15,[19][20][21]. A regular, daily consumption of green tea has been associated with many health benefits [7,22], which are mainly attributed to polyphenols, especially catechins [3,9,23].…”

Section: Introductionmentioning

confidence: 99%

Phytochemical Profile and Antioxidant Properties of Italian Green Tea, a New High Quality Niche Product

et al. 2021

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The hot beverage commonly known as tea results from the infusion of dried leaves of the plant Camellia sinensis (L.) O. Kuntze. Ranking second only to water for its consumption worldwide, it has always been appreciated since antiquity for its aroma, taste characteristics, and beneficial effects on human health. There are many different processed tea types, including green tea, a non-fermented tea which, due to oxidation prevention maintains the structure of the bioactive compounds, especially polyphenols; these bioactive compounds show a number of benefits for the human health. The main producers of tea are China and India, followed by Kenya, Sri Lanka, Turkey, and Vietnam, however recently new countries are entering the market, with quality niche productions, among which also Italy. The present research aimed to assess the bioactive compounds (polyphenols) and the antioxidant activity of two green teas (the “Camellia d’Oro” tea—TCO, and the “Compagnia del Lago” tea—TCL) produced in Italy, in the Lake Maggiore district, where nurserymen have recently started to cultivate C. sinensis. In this area the cultivation of acidophilic plants as ornamentals has been known since around 1820. Due to the crisis of the floricultural sector, producers have been trying to diversify their product in order to increase their competitiveness, starting to cultivate Italian tea. Their antioxidant activity was assessed, finding a similar or higher antioxidant capacity than in other green teas, as reported in literature. TCO showed a higher antioxidant activity (42,758.86 mmol Fe2+ kg−1; 532.37 µmol TE g−1 DW; 881.08 µmol TE g−1 DW) and phenolic content (14,918.91 mg GAE 100 g−1 DW) than TCL (25,796.61 mmol Fe2+ kg−1; 302.35 µmol TE g−1 DW; 623.44 µmol TE g−1 DW; 8540.42 mg GAE 100 g−1 DW). Through HPLC, a total of thirteen phenolic compounds were identified quantitatively, including catechins, benzoic acids, cinnamic acids, and flavonols, in TCO while only 9 in TCL, and mainly in lower amounts. Albeit with differences, both teas were found to be of quality proving that Italy could have the possibility to grow profitably C. sinensis.

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“…Similar to Fu brick tea (FBT, a brickshaped Eurotium cristatum-fermented dark tea), ECT is a daily beverage and nutritional supplement frequently consumed at the border and southern regions of China. Previous studies have shown that dark tea lowers lipid levels in the body [11] and participates in antiobesity [12], antioxidative [4], anti-inflammatory [13], and detoxification [14] processes. Further, FBT aqueous extract inhibits the mitogen-activated protein kinase (MAPK) and nuclear factor-erythroid 2-related factor-2 (Nrf2) signaling pathways in cells, thereby reducing oxidative stress levels [4].…”

Section: Introductionmentioning

confidence: 99%

Eurotium cristatum Fermented Loose Dark Tea Ameliorates Cigarette Smoke‐Induced Lung Injury by MAPK Pathway and Enhances Hepatic Metabolic Detoxification by PXR/AhR Pathway in Mice

Huang

Liu

et al. 2021

Oxidative Medicine and Cellular Longevity

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Cigarette smoke- (CS-) induced oxidative stress and inflammation in the lung are serious health problems. Primary and reprocessed tea products contain multiple antioxidants that have been reported to protect the lung against CS-induced injury. However, the beneficial effects of Eurotium cristatum fermented loose dark tea (ECT) and Eurotium cristatum particle metabolites (ECP) on CS-induced lung injury and its potential hepatic metabolic detoxification are still unclear. Therefore, sixty mice were randomly divided into six equal groups. CS-exposed mice were prevented or treated with ECP or ECT infusions for 12 or 8 weeks to determine the antioxidative stress, anti-inflammatory and potential metabolic detoxification of ECT and ECP. Thirty-six mice were randomly divided into six equal groups to observe the effects on hepatic metabolic detoxification by replacing daily drinking water with ECT. Results showed that CS significantly decreased the activities of glutathione peroxidase (GSH-Px) and superoxide dismutase (SOD) and upregulated the expressions of malondialdehyde (MDA), tumor necrosis factor alpha (TNF-α), interleukin-6 (IL-6), IL-8, and IL-1β in serum. These adverse effects were modulated by ECP and ECT. In addition, ECT upregulated the mRNA expression of pregnane X receptor (PXR) and cytochrome P450 (CYP450) in the liver on daily free drinking ECT mice group. Western blot analysis further revealed that in CS-exposed mice, ECP and ECT significantly decreased the phosphorylation of mitogen-activated protein kinase (MAPK) in the lung but upregulated the protein expressions of PXR and aryl hydrocarbon receptor (AhR) in the liver. Overall, our findings demonstrated that ECT and ECP protected against lung injury induced by CS via MAPK pathway and enhanced hepatic metabolic detoxification via PXR and AhR pathways. Therefore, daily intake of ECT and ECP can potentially protect against CS-induced oxidative and inflammatory injuries.

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Optimizing synchronous extraction and antioxidant activity evaluation of polyphenols and polysaccharides from Ya'an Tibetan tea (Camellia sinensis)

Cited by 37 publications

References 44 publications

Extraction optimization and antioxidant activity of Phyllanthus urinaria polysaccharides

Extraction optimization and antioxidant activity of Phyllanthus urinaria polysaccharides

Phytochemical Profile and Antioxidant Properties of Italian Green Tea, a New High Quality Niche Product

Eurotium cristatum Fermented Loose Dark Tea Ameliorates Cigarette Smoke‐Induced Lung Injury by MAPK Pathway and Enhances Hepatic Metabolic Detoxification by PXR/AhR Pathway in Mice

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