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1

Effect of rosemary extract and green tea extract on colour stability and quality of fermented sausage

100%
Savanovic D., Grujic S., Grujic R., Savanovic J.
Electronic Journal of Polish Agricultural Universities. Series Food Science and Technology
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2014
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tom 17
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nr 1
2

Formation of hydrogen peroxide in model solutions enriched in green tea extract

100%
Sielicka M., Malecka M., Przypis A.
Polish Journal of Food and Nutrition Sciences
|
2011
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tom 61
|
nr Suppl.1
3

Single dose of green tea extract decreases lipid digestion and absorption from a test meal in humans

100%
Walkowiak J., Bajerska J., Kargulewicz A., Lisowska A., Siedlerski G., Szczapa T., Kobelska-Dubiel N., Grzymislawski M.
Acta Biochimica Polonica
|
2013
|
tom 60
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nr 3
Background & Aims: Green tea is known worldwide for its high content of polyphenolic compounds and multifactorial beneficial effects on human health. The role of green tea as an inhibitor of lipid hydrolysis is widely discussed. The aim of the study was to assess the influence of green tea extract on lipid digestion and absorption. Methods: The study comprised 32 healthy volunteers aged 23 to 30 years with normal exocrine pancreatic function. In all subjects 13C-labelled mixed triglyceride breath test was performed twice with and without green tea extract ingestion. Cumulative percentage dose recovery was considered to reflect digestion and absorption of lipids. Values are expressed as medians and 1st-3rd quartile distribution. Results: In all subjects, cumulative percentage dose recovery values were normal in a placebo test (36.8% <30.1-43.3%>). These results were significantly higher (p=0.021) than those obtained in green tea extract test (28.8% <23.1-37.2%>). Results of six tests with GTE were abnormal. Conclusions: Single dose of green tea extract taken with a test meal decreases lipid digestion and absorption in humans.
4
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Ambivalent role of gallated catechins in glucose tolerance in humans: A novel insight into non-absorbable gallated catechin-derived inhibitors of glucose absorption

84%
Park J. H., Jin J. Y., Baek W. K., Park S. H., Sung H. Y., Kim Y. K., Lee J., Song D. K.
Journal of Physiology and Pharmacology
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2009
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tom 60
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nr 4
101-109
Prolonged postprandial hyperglycemia is a detrimental factor for type 2 diabetes and obesity. The benefit of green tea extract (GTE) consumption still requires confirmation. We report the effects of circulating green tea catechins on blood glucose and insulin levels. Oral glucose loading 1 h after GTE ingestion in humans led to higher blood glucose and insulin levels than in control subjects. Gallated catechins were required for these effects, although within the intestinal lumen they have been known to decrease glucose and cholesterol absorption. Treatment with epigallocatechin-3-gallate hindered 2-deoxyglucose uptake into liver, fat, pancreatic beta-cell, and skeletal muscle cell lines. The glucose intolerance was ameliorated by gallated catechin-deficient GTE or GTE mixed with polyethylene glycol, which was used as an inhibitor of intestinal absorption of gallated catechins. These findings may suggest that the gallated catechin when it is in the circulation elevates blood glucose level by blocking normal glucose uptake into the tissues, resulting in secondary hyperinsulinemia, whereas it decreases glucose entry into the circulation when they are inside the intestinal lumen. These findings encourage the development of non-absorbable derivatives of gallated catechins for preventative treatment of type 2 diabetes and obesity, which would specifically induce only the positive luminal effect.
5
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Green tea extracts lower serum folates in rats at very high dietary concentrations only and do not affect plasma folates in a human pilot study

84%
Augustin A., Frank J., Augustin S., Langguth P., Ohrvik V., Witthoft C. M., Rimbach G., Wolffram S.
Journal of Physiology and Pharmacology
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2009
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tom 60
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nr 3
103-108
Green tea catechins (GTC) have been shown to inhibit the activities of enzymes involved in folate uptake. Hence, regular green tea drinkers may be at risk of impaired folate status. The present experiments aimed at studying the impact of dietary GTC on folate concentrations and metabolism. In a human pilot study (parallel design) healthy men consumed for 3 weeks 6 capsules (~670 mg GTC) per day (2 capsules with each principal meal) containing aqueous extracts of the leaves of Camellia sinensis (n=17) or placebo (n=16). No differences in plasma folate concentrations were observed between treatments. We further fed groups of 10 male rats diets fortified with 0, 0.05, 0.5, 1, or 5 g GTC/kg for 6 weeks. Only at the highest intake, GTC significantly decreased serum 5-methyl-tetrahydrofolate concentrations in rats, while mRNA concentrations of reduced folate carrier, proton-coupled folate transporter/heme carrier protein 1, and dihydrofolate reductase (DHFR) remained unchanged in intestinal mucosa. Using an in vitro enzyme activity assay, we observed a time- and dose-dependent inhibition of DHFR activity by epigallocatechin gallate and a green tea extract. Our data suggest that regular green tea consumption is unlikely to impair folate status in healthy males, despite the DHFR inhibitory activity of GTC.
6
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Evaluation of selected food supplements containing antioxidant

84%
Lastawska K.
Roczniki Państwowego Zakładu Higieny
|
2010
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tom 61
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nr 2
151-154
Seven commercial food supplements present on the Polish market were evaluated for their in vitro antioxidant capacity. The selected products were in the form of hard gelatin capsules. They contained the extracts from chokeberry, cranberry, blueberry and green tea. The mixture of vitamins and minerals as well as the product containing vitamin C in substantial dose were included into comparison. The products were examined using three methods in order to evaluate their antioxidant capacity: electron paramagnetic resonance (EPR), Trolox equivalent antioxidant capacity (TEAC), oxygen radical absorbing antioxidant capacity (ORAC) assays. Total polyphenolic content was determined according to Folin-Ciocalteu method. The results were calculated per capsule. All studied preparations showed antioxidant properties and may provide substantial antioxidant protection. The in vitro antioxidant capacity varied considerably and was associated with the content of polyphenols in the capsule. The supplement with 250 mg of green tea extract was the most potent antioxidant in all assays. Nevertheless it must be remembered that the amounts of extracts were different in encapsulated products. As the quality of extracts and their properties are miscellaneous, there is a need to standardize dietary antioxidant supplements with respect to their antioxidant capacity if effective doses are to be recommended.
7

Tea extracts as free radical scavengers

84%
Gramza A., Pawlak-Lemanska K., Korczak J., Wasowicz E., Rudzinska M.
Polish Journal of Environmental Studies
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2005
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tom 14
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nr 6
Antiradical activity was measured with the use of two different methods of scavenging the stable free radicals ABTS+• and DPPH• . Examined tea extracts showed different antiradical activity. Best activity in scavenging ABTS+• expressed as TAA (total antioxidant activity) showed black tea aqueous and ethanol extracts. Green tea extracts were four times less effective. Antiradical activity showed that the lowest concentration needed to scavenge the 50% of initial DPPH• radical (EC₅₀) was green and black tea ethanol extracts. Aqueous extracts showed 50% lower activity than equivalent ethanol extracts. Research proved that antiradical activity of plant extracts is dependent on mechanisms of oxidative activity of free radicals used and the chemical structure of contained antioxidants.
8
Content available remote

Lipid rafts mediate epigallocatechin-3-gallate- and green tea extract-dependent viability of human colon adenocarcinoma COLO 205 cells; clusterin affects lipid rafts-associated signaling pathways

67%
Pajak B., Kania E., Gajkowska B., Orzechowski A.
Journal of Physiology and Pharmacology
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2011
|
tom 62
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nr 4
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