1151 Green Tea Extract for Weight Management: Insights from a Meta-Analysis

This study aimed to evaluate the effects of the separate provision of green and oregano tea extracts on the biomarkers of the redox state and health condition in pre-weaned Jersey calves from birth to 60 days of life. Two experiments following the complete randomized design with measures repeated in time were carried out using 38 Jersey calves (17 and 21 calves in experiments 1 and 2, respectively). Calves were distributed according to date of birth into one of three groups: control (CON) - with no addition of extracts; oregano extract (OE) - addition of 70 mg of oregano extract/kg of body weight (BW) and green tea extract (GT) - addition of 35 mg of green tea extract/kg of BW. Eight biomarkers of the redox state were evaluated on days 1, 30, and 60 after birth, and variables measured on day 1 were used as covariates. Body temperature and occurrence of diarrhea were evaluated every two days. Regarding the main results, the supply of oregano extract reduced the concentration of oxidizing biomarkers, such as DCFP (oxidation of dichlorofluorescein in plasma) and carbonyl, and increased the activity of antioxidant enzymes, such as GPx and catalase. Green tea extract only reduced DCFP and tended to improve catalase activity. Calves remained healthy (no fever and only a few days with diarrhea), and plant extracts did not improve their health condition. The addition of green tea and oregano extracts into the diet has a positive effect on redox status in pre-weaned Jersey calves.

This experiment was conducted to determine the optimum level of green tea extract (GTE) in diets without antibiotics and to evaluate its effect on broiler performances. A total of 100 Cob broiler chicks were kept for a period of 5 weeks. Dietary treatments used in this experiment were antibiotic free group (basal diet as a control), GTE 0.5% (basal + GTE 0.5%), GTE 1% (basal + GTE 1%) and GTE 2% (basal + GTE 2%) and antibiotic added group (basal + 0.05% oxytetracycline). GTE supplemented group showed significantly higher body weight and better feed conversion ratio (FCR) than other treatments (P < 0.05) where highest live weight (2034 g/bird) was recorded in broilers group provided with 0.5% GTE. The best FCR (1.58) was observed in the group supplemented with 0.5% GTE. The obtained results also revealed significant (P < 0.05) difference among treatments in the lipid profile parameters (total cholesterol, HDL and triglyceride except LDL). Broilers treated with 0.5% GTE showed lowest total cholesterol (115.0 mg/dl), triglyceride (116.3 mg/dl) and highest HDL (30.75 mg/dl). In conclusion, GTE can be added in the diet @ 0.5% for better growth performances of broiler as an alternative to antibiotic without any negative effect on lipid profile.
 Res. Agric., Livest. Fish.8(1): 157-163, April 2021

Background: The antioxidative activity of green tea and garden cress extract is of interest in cancer. Objectives: The current study aimed at evaluating the effect of hydroalcoholic extracts of Lepidium sativum (cress) and Camellia sinensis (green tea) on the culture medium of the HeLa cell line. Methods: Dulbecco’s Modified Eagle’s medium (DMEM) containing 10% fetal bovine serum (FBS) was used to culture HeLa cells, which was exposed to the different concentrations of green tea and cress extracts at 24 hours and 48 hours. Cell viability and apoptotic cells were quantified by 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide or MTT assay and propidium iodide, respectively. Results: The highest percentage of growth inhibition (85%) was observed at 100 μg/mL of the green tea extract after 48-hour treatment. The percentage of growth inhibition at 24 h after treatment was 83% for green tea (P > 0.05). The high growth inhibition percentage of HeLa cells at 100 μg/mL of cress extract at 24 hours and 48 hours (49.8%) after treatment was 27.92% and 49.8%, respectively (P > 0.05). Additionally, the cell apoptosis assay indicated that green tea and cress extracts had toxic effects on the HeLa cells. This effect was highest at the concentration of 100 μg/mL and more evident in green tea. Conclusions: It can be concluded that green tea extract compared with cress had a more cytotoxic effect against cervical cancer.

Background: 35% Hydrogen peroxide (H 2O 2) as an active material for internal bleaching can produce free radicals that can affect resin tag penetration into the dentinal tubules. Application of 10% and 35% green tea (GT) extract as an antioxidant after 2 minutes are expected to remove free radical residues and increase dentin shear bond strength and resin tags penetration depth after non-vital bleaching. Methods: 30 extracted healthy human premolars were cut horizontally 2 mm from the Cemento Enamel Junction margin to the crown part, then cut in a mesio-distal direction into two parts. The specimens were divided into five groups: normal dentin, post bleaching dentin, delayed 2 weeks, 10% GT, and 35% GT group. Non-vital walking bleach with 35% H 2O 2 gel was done to all groups except control group. Soon after, 10% and 35% GT extract gel were applied on dentin for 2 minutes, then the specimens were rinsed-off with aquabidest for 2 minutes and dried. All specimens were etched and bonded with an etch-and-rinse adhesive system and filled with resin composite. The shear bond strength assessment was carried out using a Universal Testing Machine (UTM) with a cross-head speed of 0.5 mm/minute. Confocal laser scanning microscopy (CLSM) with a wavelength of 560 nm and a lens magnification of 40x was used to analyze the resin tag penetration. Data were analyzed by one way ANOVA and t-test. Results: There was a significant difference in resin tag penetration depth and shear bond strength between applying 10% and 35% GT extract (p < 0.05). The 35% GT extract group resulted in a significantly longer resin tag penetration than the 10% GT extract group. Conclusions: The application of 35% GT extract is more effective than 10% GT extract as an antioxidant for increasing the shear bond strength of composite resin after internal bleaching.

Alcohol exacerbated biochemical and biophysical alterations in liver mitochondrial membrane of diabetic male wistar rats – A possible amelioration by green tea

INTRODUCTION: Humans have innate and adaptive defense mechanisms that, collectively, protect us against diseases and infections. But a malfunction of our immune system may cause harm in the form of autoimmune diseases. CASE DESCRIPTION/METHODS: We present a 29 year old female with no PMH who sought outpatient evaluation for new onset jaundice. With the intent of losing weight, the patient followed a strict diet, consisting of apples and water with one ‘cheat’ meal per week. In conjunction, patient reported using a daily herbal extract with containing green tea and green coffee bean extract. There was no family history of liver or autoimmune disease. After 4 months, she developed nausea, vomiting and jaundice. She was hemodynamically stable and afebrile. With the exception of jaundice the physical examination was unremarkable. Imaging (CT and MRI) of the liver revealed periportal edema. Initial laboratory evaluation showed ALT 960, AST 1162, T BR 17.3 & INR 1.9. HBV, HCV, HSV, HIV, EBV and CMV, Wilson’s disease and alpha 1 antitrypsin deficiency were ruled out as the cause of the patient’s acute liver injury. ANA titer was 1:1280 with a speckled pattern. Antimitochondrial, smooth muscle and liver kidney microsomal antibodies were negative. Due to persistent decompensation, liver biopsy was done with extensive hepatic necrosis. She was ultimately diagnosed with autoimmune hepatitis and treated with corticosteroids and later azathioprine. DISCUSSION: Although acute liver injury induced by green tea consumption has been described, the association with autoimmune hepatitis has been rarely reported. Green tea leaves contain polyphenols, flavonols and catechinis. The polyphenols have antioxidant, anticarcinogenic, anti-inflammatory, thermogenic and antimicrobial properties. Green tea extract has been associated with acute hepatitis and fulminant hepatic failure. The mechanisms leading to cytotoxicity include mitochondrial membrane destruction and induction of reactive oxygen species. Patients with autoimmune hepatitis may have symptoms of jaundice with hypergammaglobulinemia and positive serum antibodies (ANA, smooth muscle and liver kidney microsomal). The liver develops inflammation, necrosis and fibrosis for which therapy with corticosteroids and azathioprine are used. These findings were noted in our patient after several months of green tea and green coffee bean consumption. Therefore we hypothesize that green tea may, in rare circumstances, be the trigger of autoimmune hepatitis.

This study was conducted in the Poultry farm technical-Agriculture research center in Salah Aldeen to investigate amla and green tea extract effect to product performance and some blood parameters on Japanese quail. In total, 300 17 weeks old quail birds were used in this study and were randomly distributed into four treatments (three replicate each treatment (n=25). The treatment groups were control (basal diet) without supplement, 1% green tea extract (GT 1%), 1% amla (AM 1%) and 1% mixed (GT+AM 1%) respectively. The results show that amla extract improved egg production significantly (P≤0.05) compared to control. The egg weight and egg mass were not significant (P<0.05) between each group. Amla aqueous extract (1%) shows a significant difference in feed intake as compared to the control. Hematology traits revealed a significant increase in Red Blood Cell (RBC) and hemoglobin (Hb) in green tea and amla extracts compared with control and a significant difference was observed between the aqueous extract groups and control in PCV % value. The results showed that there are no significant differences between treatments in each of Total Protein, Albumin and Globulin, but the results indicated a significant decrease (P<0.05) of Triglyceride, Cholesterol and Glucose, in the treatments of amla and green tea aqueous extract compare the control treatment.

The study aims to investigate the impact of green tea extract on the thickness of bronchial epithelium and pulmonary artery walls in mice lungs exposed to cigarette smoke. Twenty-five 12-week-old mice (Mus musculus) weighing between 20-25 grams were used in the experiment. The control group (K(-)) received no cigarette smoke exposure and was administered 0.5 mL of 1% Na-CMC, while the positive control group (K(+)) was exposed to cigarette smoke without green tea leaf extract and received 0.5 ml of 1% Na-CMC. Groups exposed to cigarette smoke (P1, P2, and P3) were given green tea extract at doses of 20 mg/kgBW, 40 mg/kgBW, and 60 mg/kgBW respectively, each in a daily dose of 0.5 ml. Mice were exposed to one cigarette per group per day. The findings indicate that administering green tea extract has the potential to reduce the thickening of both the bronchial epithelium and pulmonary artery walls, with the optimal dose being 40 mg/kgBW. Analysis using ANOVA revealed significant differences in the thickness of the bronchial epithelium and pulmonary artery walls among the groups (p &lt; 0.05). This study demonstrates that administering green tea extract suspension (Camellia sinensis) can effectively mitigate the thickening of the bronchial epithelium and pulmonary artery walls in mice lungs exposed to cigarette smoke.

Green tea or green tea extract (GT/GTE) has been demonstrated to reduce insulin resistance and improve glycemic control. However, evidence for this health beneficial effect is inconsistent. This systematic review evaluated the effect of GT/GTE on insulin resistance and glycemic control in people with pre-diabetes/type 2 diabetes mellitus (T2DM). Ovid MEDLINE, Embase, AMED, Web of Science, and the Cochrane Library were searched up to April 2017 for randomised controlled trials of participants with pre-diabetes or T2DM, where the intervention was GT/GTE. Meta-analysis was performed to assess the standardised mean difference (SMD) in biomarkers of insulin resistance and glycemic control between GT/GTE and placebo groups. Six studies (n=382) were pooled into random-effects meta-analysis. Overall, no differences were found between GT/GTE and the placebo for glycosylated hemoglobin (HbA1c: SMD, −0.32; 95% confidence interval [CI], −0.86 to 0.23), homeostatic model assessment for insulin resistance (HOMA-IR: SMD, 0.10; 95% CI, −0.17 to 0.38), fasting insulin (SMD, −0.25; 95% CI, −0.64 to 0.15), and fasting glucose (SMD, −0.10; 95% CI, −0.50 to 0.30). No evidence support the consumption of GT/GTE could reduce the levels of HbA1c, HOMA-IR, fasting insulin, or fasting glucose in people with pre-diabetes/T2DM. However, the studies included were small and of varying quality.

The current study hypothesized that omega-3 fatty acids ω-3 FAs consumed with various tea extracts, which included green tea extract comprising 35% and 65% catechin (GTE35 and GTE65), naturally fermented green tea (Heukcha) extract (NFGT), and a complex of heat-treated green tea and enzymatically-modified isoquercitrin (1:1, w:w) (AdiphenonTM) would enhance the digestive stability and intestinal absorption of ω-3 FAs. The digestive stability of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) co-digested with GTE65 using an in vitro digestion model system was improved by up to 20.76% and 23.22%, respectively, compared to ω-3 FAs. The oxidative stability, measured using peroxide values, was the lowest, whereas the DPPH radical scavenging capacity during digestion was the highest in Adiphenon™, showing 1.03 ± 0.25 meq O2/kg oil and 1251.96 ± 26.03 µmol TE/g. The deviation in zeta potential was reduced when ω-3 FAs were co-treated with various tea extracts, indicating that the micelle of ω-3 FAs is stable. The intestinal absorption in Caco-2 cells increased by up to 34.53% for EPA and 60.23% for DHA with various tea extracts compared to ω-3 FAs alone. The co-treatment with GTE35 and Adiphenon™ did not alter the expression of P-glycoprotein (P-gp) compared to ω-3 FAs alone, which implies the efflux of tea polyphenols, such as catechins, could be limited due to the suppression of P-gp by ω-3 FA. The results from the current study suggest that the co-intake of ω-3 FAs with various tea extracts could increase the bioavailability of ω-3 FAs by preventing oxidation, stabilizing micelle structures, and minimizing intestinal efflux.

The current study aimed to evaluate and compare the antifungal activity of hydroalcoholic extracts of Borage officinalis and Camellia sinesis (Green tea) against different Candida and Aspergillus strains. Antifungal effects of extracts were determined by disc diffusion and broth macrodilution methods. The Borago officinalis extract showed the highest antifungal activity against A. niger and the lowest effect against C. kreusei, C. dubliniensis, A. fumigatus and A. flavus. The Green tea extract revealed high antifungal activity against C. guilliermondii and C. dubliniensis and less effect against C. parapsilosis and A. fumigatus. The MIC values for Borago officinalis and Green tea extracts were ranged from 1.56 to 25 mg/ml and 3.125 to 25 mg/ml, respectively. This study suggests that Borago officinalis and Green tea are valuable plant sources of medicinally useful compounds that this may help to avoid the side effects of antifungals. The combined use of Green tea or Borago officinalis extracts and antifungals could be also useful in fighting emerging drug-resistant problem among fungal pathogens.

This study evaluated the effects of varying levels of dietary green tea extract (GTE) on growth performance, Clostridium perfringens (CP) colonization, and inflammatory responses in broiler chickens during experimental subclinical necrotic enteritis (SNE). In a 21-day experiment, 480 one-day-old male broiler (Ross 708) chicks were equally allotted into four dietary treatment groups. From days 1 to 10, all groups received a corn-soy basal diet, switching to a wheat-fish diet on day 11. Treatments included CON (no GTE), GTX, GTY, and GTZ (250, 500, and 1000 mg/kg GTE, respectively). On day 11, each group split into ACON, AGTX, AGTY, and AGTZ, totaling eight treatments. From days 17 to 20, ACON, AGTX, AGTY, and AGTZ chicks were orally challenged twice daily with 3 mL CP26 (2.5 × 108 CFU/mL). On d 16 (pre-challenge) and d 1 post-challenge, ileo-jejunal contents were collected for CP enumeration, and jejunum tissue was analyzed via qRT-PCR to determine the expression levels of IL-1β, IFNγ, TNF-α, TGFβ, IL-10, and MUC2 genes. Challenged chicks showed poorer (p ≤ 0.05) growth and higher intestinal CP, with a potential improvement in GTE-supplemented diets. Findings suggests that dietary GTE supplementation mitigated the characteristic growth depression during SNE, reduced intestinal CP infection, and modulated inflammatory response in broiler chicks.

Background: Infertility is a reproductive system problem and has been increasing recently. One of the reasons is the poor quality of spermatozoa, which can be assessed through its morphology and motility. Excessive consumption of MSG can affect the quality of spermatozoa. The provision of a combination of green tea and roselle extract, which is an antioxidant and is expected to be able to counteract the effects of MSG’s free radicals on spermatozoa. The objective of the study is to determine the morphology and motility of Wistar Rats’ spermatozoa in the control group given MSG and in the experimental group given MSG and a combination of green tea and roselle extract at a dose of 200 mg/kg/day and 400 mg/kg/day for 14 days.&#x0D; Methods: Fifteen Wistar rats were randomly divided into three groups, a control group with MSG, group 1 with MSG and a combination of green tea and roselle extract at a dose of 200 mg/kg BW/day (P1), and group 2 with MSG and combination green tea and roselle extract at a dose of 400 mg/kg BW/day (P2). After 14 days of treatment, the morphology and motility of the spermatozoa of each mouse were studied and assessed microscopically.&#x0D; Results: In the morphological study, the control group had the lowest normal value and the highest abnormal value among all groups. Meanwhile, the P1 group had the highest normal and lowest abnormal values compared to the other two groups.&#x0D; Conclusion: The administration of a combination of green tea and roselle extract improved the morphology and motility of Wistar rats’ spermatozoa. However, an increased dose of a combination of green tea and roselle extract was not proven to affect the morphology and motility of Wistar rats' spermatozoa.

Plant extracts may represent an ecofriendly alternative to chemical fungicides to limit aflatoxin B1 (AFB1) contamination of foods and feeds. Mate (Ilex paraguariensis), rosemary (Romarinus officinalis) and green tea (Camellia sinensis) are well known for their beneficial properties, which are mainly related to their richness in bioactive phenolic compounds. AFB1 production is inhibited, with varying efficiency, by acetone/water extracts from these three plants. At 0.45 µg dry matter (DM)/mL of culture medium, mate and green tea extracts were able to completely inhibit AFB1 production in Aspergillus flavus, and rosemary extract completely blocked AFB1 biosynthesis at 3.6 µg DM/mL of culture medium. The anti-AFB1 capacity of the extracts correlated strongly with their phenolic content, but, surprisingly, no such correlation was evident with their antioxidative ability, which is consistent with the ineffectiveness of these extracts against fungal catalase activity. Anti-AFB1 activity correlated more strongly with the radical scavenging capacity of the extracts. This is consistent with the modulation of SOD induced by mate and green tea in Aspergillus flavus. Finally, rutin, a phenolic compound present in the three plants tested in this work, was shown to inhibit AFB1 synthesis and may be responsible for the anti-mycotoxin effect reported herein.

The water extract of green tea and lemongrass were investigated for their antioxidant effects in Wistar albino rats. Control and Test groups of rats were administered with paracetamol (2 g/kg) on the 10th day of the experiment while the test groups were pre-treated with 100 mg/kg body weight of green tea and lemongrass for 10 days. The effect of the extracts on serum levels of malondialdehyde, catalase activity and vitamin C were measured in paracetamol-induced hepatotoxicity in rats. Further, the effects of the extract on cholesterol and phospholipids were estimated. Cholesterol/phospholipids ratio was computed. The extracts of green tea and lemongrass produced significant (P paracetamol-induced lipids peroxidation perhaps by its antioxidative effects hence eliminating the deleterious effects of toxic metabolites from paracetamol