Metabolomics Study Reveals Enhanced Inhibition and Metabolic Dysregulation in Escherichia coli Induced by Lactobacillus acidophilus-Fermented Black Tea Extract

2018 ◽  
Vol 66 (6) ◽  
pp. 1386-1393 ◽  
Author(s):  
Kundi Yang ◽  
Matthew L. Duley ◽  
Jiangjiang Zhu
Keyword(s):  
Escherichia Coli ◽  
Lactobacillus Acidophilus ◽  
Black Tea ◽  
Metabolic Dysregulation ◽  
Black Tea Extract ◽  
Metabolomics Study ◽  
Tea Extract

Isolation of Epigallocatechin Gallate from Green Tea and its Effects on Probiotics and Pathogenic Bacteria

2017 ◽  
Vol 17 (1) ◽  
pp. 69-77
Author(s):  
Tu Lijun ◽  
Sun Hanju ◽  
He Shudong ◽  
Zhu Yongsheng ◽  
Yu Ming ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Escherichia Coli ◽  
Green Tea ◽  
Lactobacillus Acidophilus ◽  
Pathogenic Bacteria ◽  
Epigallocatechin Gallate ◽  
Microbial Populations ◽  
Medium Ph ◽  
Bioactive Substance ◽  
Tea Extract

The aim of this study was to investigate epigallocatechin gallate (EGCG) prebiotics activities systematically which was reported as a bioactive substance. Therefore, EGCG was separated by water extraction, resin purification and prep-HPLC. Then the production of EGCG was confirmed by HPLC and mass spectrometry (MS) analysis and its purify was 97.23%. EGCG extractive and green tea extract (GTE) were further incubated with Bifidobacterium infantis, B. adolescentis, B. bifidum and Lactobacillus acidophilus to study its effect on microbial populations and medium pH. Finally, Escherichia coli, Salmonella, Staphylococcus aureus and Candida albicans were employed as pathogenic bacteria to explore the antimicrobial activity of EGCG and GTE. The results demonstrated that EGCG extractive could be beneficial for the proliferation of Bifidobacterium and L. acidophilus and also inhibit some pathogenic bacteria. In conclusion, both EGCG extractive and GTE had prebiotics activities and the effects of EGCG extractive were superior to those of GTE.

Theaflavin Enriched Black Tea Extract Alleviates Diabetic Nephropathy by Suppressing Hyperglycaemia-Mediated Oxidative Stress and Inflammation in Streptozotocin-Induced Rats

2020 ◽  
Vol 10 ◽  
Author(s):  
Dhrubajyoti Sarkar ◽  
Sekhar Kumar Bose ◽  
Tania Chakraborty ◽  
Souvik Roy
Keyword(s):  
Oxidative Stress ◽  
Diabetic Nephropathy ◽  
Blood Glucose ◽  
Blood Urea Nitrogen ◽  
Phenolic Content ◽  
Black Tea ◽  
Total Phenolic ◽  
Urea Nitrogen ◽  
Black Tea Extract ◽  
Tea Extract

Background: Diabetic nephropathy (DN), a microvascular complication of diabetes has been a significant health issue globally. However, theaflavin enriched black tea extract (BTE-TF) could restrain DN. Objective: The main objective of this exploration was to elucidate the effect of BTE-TF on DN, though the underlying mechanism remains unclear and requires further investigation. Method: The tea leaves were fermented to get black tea extract. Total phenolic content and HPLC were carried out to determine the phenolic content and theaflavin in the extract. Streptozotocin induced diabetic rats were treated with 100, 200, and 400 mg/kg/day BTE-TF extract for 12 weeks. Biochemical parameters like blood glucose, creatinine, blood urea nitrogen (BUN), triglyceride and antioxidant parameters of kidney tissue were measured. Histology, immunohistochemistry and TUNEL assay were performed to observe the effect of the extract with comparison to the standard drug (Metformin 200mg/kg/day). Result: Treated animals exhibited reduced blood glucose levels, blood urea nitrogen (BUN), creatinine, and serum triglycerides. Further, BTE-TF restored the histological alterations in the kidney. Chronic hyperglycaemia resulted in a significant increase in oxidative stress and pro-inflammatory cytokines of NF-kβ pathway. BTE-TF attenuated oxidative stress (p<0.01), inflammation (p<0.05) and apoptosis (p<0.05). Conclusion: This study suggests that BTE-TF exerts a protective role against diabetes-induced renal injury by ameliorating oxidative stress, inflammation, and apoptosis.

scholarly journals Development and Characterization of Functional Starch-Based Films Incorporating Free or Microencapsulated Spent Black Tea Extract

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3898
Author(s):  
Surakshi Wimangika Rajapaksha ◽  
Naoto Shimizu
Keyword(s):  
Antioxidant Activity ◽  
Lipid Oxidation ◽  
Food Packaging ◽  
Uv Light ◽  
Antioxidant Properties ◽  
Black Tea ◽  
Wall Material ◽  
Food Simulants ◽  
Black Tea Extract ◽  
Tea Extract

Antioxidant polyphenols in black tea residue are an underused source of bioactive compounds. Microencapsulation can turn them into a valuable functional ingredient for different food applications. This study investigated the potential of using spent black tea extract (SBT) as an active ingredient in food packaging. Free or microencapsulated forms of SBT, using a pectin–sodium caseinate mixture as a wall material, were incorporated in a cassava starch matrix and films developed by casting. The effect of incorporating SBT at different polyphenol contents (0.17% and 0.34%) on the structural, physical, and antioxidant properties of the films, the migration of active compounds into different food simulants and their performance at preventing lipid oxidation were evaluated. The results showed that adding free SBT modified the film structure by forming hydrogen bonds with starch, creating a less elastic film with antioxidant activity (173 and 587 µg(GAE)/g film). Incorporating microencapsulated SBT improved the mechanical properties of active films and preserved their antioxidant activity (276 and 627 µg(GAE)/g film). Encapsulates significantly enhanced the release of antioxidant polyphenols into both aqueous and fatty food simulants. Both types of active film exhibited better barrier properties against UV light and water vapour than the control starch film and delayed lipid oxidation up to 35 d. This study revealed that starch film incorporating microencapsulated SBT can be used as a functional food packaging to protect fatty foods from oxidation.

scholarly journals Black Tea Extract and Its Theaflavin Derivatives Inhibit the Growth of Periodontopathogens and Modulate Interleukin-8 and β-Defensin Secretion in Oral Epithelial Cells

PLoS ONE ◽  
2015 ◽  
Vol 10 (11) ◽  
pp. e0143158 ◽  
Author(s):  
Telma Blanca Lombardo Bedran ◽  
Marie-Pierre Morin ◽  
Denise Palomari Spolidorio ◽  
Daniel Grenier
Keyword(s):  
Epithelial Cells ◽  
Black Tea ◽  
Interleukin 8 ◽  
Oral Epithelial Cells ◽  
Black Tea Extract ◽  
Tea Extract ◽  
Oral Epithelial

Anticancer Effect of Epitheaflagallin 3-O-Gallate, a Very Minor Constituent of Black Tea Extract

2021 ◽  
Vol 1 (8) ◽  
pp. 1428-1435
Author(s):  
Nobuya Itoh ◽  
Hiroshi Toda ◽  
Tatsuki Wakita ◽  
Yuna Yamamoto ◽  
Yoshihide Makino ◽  
...  
Keyword(s):  
Black Tea ◽  
Minor Constituent ◽  
Anticancer Effect ◽  
Black Tea Extract ◽  
Tea Extract

scholarly journals Black Tea Extract on the Preservation of Cantonese Sausage

2020 ◽  
Vol 16 (3) ◽  
pp. 417-423 ◽  
Author(s):  
Huan Cheng ◽  
Ying Liu ◽  
Dan Wu ◽  
Xiaona Zhao ◽  
Chenlan Mao ◽  
...  
Keyword(s):  
Black Tea ◽  
Black Tea Extract ◽  
Tea Extract

Protection by Black Tea Extract Against Chromosome Damage Induced by Two Heavy Metals in Mice

1999 ◽  
Vol 37 (3) ◽  
pp. 243-247 ◽  
Author(s):  
Paramita Mukherjee ◽  
Sandeep Poddar ◽  
Geeta Talukder ◽  
Archana Sharma
Keyword(s):  
Heavy Metals ◽  
Black Tea ◽  
Chromosome Damage ◽  
Black Tea Extract ◽  
Tea Extract
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