scholarly journals APLIKASI FOSFAT PADA PROSES EKSTRAKSI TEH HIJAU UNTUK MINUMAN TEH HIJAU SIAP MINUM

2021 ◽  
Vol 32 (1) ◽  
pp. 36-51
Author(s):  
Rima Hidayati ◽  
◽  
Nuri Andarwulan ◽  
Dian Herawati ◽  
Keyword(s):  
Ascorbic Acid ◽  
Phosphoric Acid ◽  
Incubation Period ◽  
Green Tea ◽  
Positive Impact ◽  
Quality Parameters ◽  
Intention To Purchase ◽  
Green Tea Leaves ◽  
Tannin Degradation ◽  
Tea Extract

Color is one of quality parameters that affects consumer intention to purchase ready to drink (RTD) green tea. Consumers expect RTD green tea to have yellow greenish color, however the color becomes brown and darker during the shelf life. This study aimed to evaluate the effect of phosphate mix addition to water prior to green tea leaves extraction on pH, color, and the tannin in tea extract, pre-RTD, and RTD during incubation period at 60°C for 2 days. The pre-RTD contained tea extract, sugar, and ascorbic acid. Addition of sodium bicarbonate was done in pre-RTD to obtain RTD with pH of 6.1±0.2. The type of phos-phate used was sodium acid pyrophosphate (SAPP) and phosphoric acid. The concentrations of SAPP were 650 and 1300 mg/L, while those of phosphoric acid were 125, 250, and 500 mg/L.The total phospho-rous added from the combination of SAPP and phosphoric acid was 221-521 mg/L. Meanwhile, green tea extracted without phosphate was used as a control. The results showed that phosphate addition to water prior to green tea extraction caused decrease in pH of tea extract from 5.83±0.18 to 2.8-3.8, decrease in browning intensity, and reduced tannin degradation during the incubation period. Sugar and ascorbic acid added to the tea extract resulted in pH in all samples <4.0 and maintained the lightness of the pre-RTD. Phosphate application was not able to retain the color of RTD after incubation period. This study showed that addition of phosphorous as a combination of SAPP and phosphoric acid to water at concentrations of 221-521 mg/L prior to green tea extraction had positive impact in reducing browning intensity of RTD green tea with pH of lower than 4.0.

In Vitro and In Vivo Antitumorigenic Activity of a Mixture of Lysine, Proline, Ascorbic Acid, and Green Tea Extract on Human Breast Cancer Lines MDA-MB-231 and MCF-7

2005 ◽  
Vol 22 (2) ◽  
pp. 129-138 ◽  
Author(s):  
M. Waheed Roomi ◽  
Vadim Ivanov ◽  
Tatiana Kalinovsky ◽  
Aleksandra Niedzwiecki ◽  
Matthias Rath
Keyword(s):  
Breast Cancer ◽  
Ascorbic Acid ◽  
Green Tea ◽  
Human Breast Cancer ◽  
Human Breast ◽  
Antitumorigenic Activity ◽  
Tea Extract ◽  
Mcf 7

Semi-synthesis and proteasome inhibition of D-ring deoxy analogs of (–)-epigallocatechin gallate (EGCG), the active ingredient of green tea extract

2008 ◽  
Vol 86 (6) ◽  
pp. 495-502 ◽  
Author(s):  
Congde Huo ◽  
Guoqing Shi ◽  
Wai Har Lam ◽  
Di Chen ◽  
Quizhi Cindy Cui ◽  
...  
Keyword(s):  
Natural Product ◽  
Green Tea ◽  
Epigallocatechin Gallate ◽  
Proteasome Inhibition ◽  
Synthetic Route ◽  
Tea Leaves ◽  
Green Tea Leaves ◽  
Inhibitory Activities ◽  
Cistus Salvifolius ◽  
Tea Extract

A semi-synthetic route to the D-ring analogs of (–)-epigallocatechin gallate (EGCG) from the relatively abundant (–)-epigallocatechin (EGC), isolated from green tea leaves, is described. A natural product (13), found in Cistus salvifolius, its acetate (14) and analog (17) were synthesized by this method. Their inhibitory activities against proteasomes were investigated.Key words: green tea, (–)-epigallocatechin gallate (EGCG), (–)-epigallocatechin (EGC), proteasome inhibition.

scholarly journals SYNTHESIS OF SILVER NANOPARTICLES FROM SILVER NITRATE SOLUTION USING GREEN TEA EXTRACT (CAMELIA SINENSIS) AS BIOREDUCTOR

2017 ◽  
Vol 6 (1) ◽  
pp. 32-38 ◽  
Author(s):  
Wara Dyah Pita Rengga ◽  
Arie Yufitasari ◽  
Wismoyo Adi
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Green Tea ◽  
Nitrate Solution ◽  
Green Tea Extract ◽  
Average Particle ◽  
Face Centered Cubic ◽  
Tea Leaves ◽  
Green Tea Leaves ◽  
Tea Extract

The synthesis of silver nanoparticles with micro size is highly required in antibacterial fields. The biorefinery material is highly potential as a bioreductor which is applied in the synthesis of nanoparticles. The bioreductor is made from green tea leaves extraction using aquadest to extract its active substance, the catechin which is derived from polyphenol. The polyphenol can reduce the synthesis of silver nanoparticles naturally. The result of FTIR analysis from green tea leaves extract containing polyphenol shown in the uptake functional groups is -OH group located in 3425 cm-1, C=O group located in 1635 cm-1, C=C group located in 1527, and 1442 cm-1 , and C-O group located in 1234 cm-1. The precursors of AgNO3 was used as the main synthetic material. The synthetic condition was resulted from the reaction between the extraction of green tea extract and AgNO3 as the precursors in the variation of synthetizing time. The heating process during synthesizing is done in 50 ?C along with stirring to foster the creation of silver nanoparticles. The analysis result of XRD shows that silver nanoparticles has the diffraction peaks in the angle of 2 theta that are 44.08, 64.40, and 77.51. The types of silver nanoparticles is Ag0 nanoparticles with face-centered cubic crystal structure. Based on TEM analysis, the size and particle size distribution can be determined using image J. The distribution shows that the longer synthesizing time, the bigger nanoparticles produced. With synthesizing times at 24 hours, 6 hours, 3 hours, and 2 hours produce average particle size of 26.4 nm; 9.2 nm; 8.4 nm; and 7.4 nm respectively.

scholarly journals Protective Effect of Epigallocatechin-3-Gallate (EGCG) in Diseases with Uncontrolled Immune Activation: Could Such a Scenario Be Helpful to Counteract COVID-19?

2020 ◽  
Vol 21 (14) ◽  
pp. 5171 ◽  
Author(s):  
Marta Menegazzi ◽  
Rachele Campagnari ◽  
Mariarita Bertoldi ◽  
Rosalia Crupi ◽  
Rosanna Di Paola ◽  
...  
Keyword(s):  
Autoimmune Diseases ◽  
Green Tea ◽  
Signal Transducer ◽  
Tea Leaves ◽  
Inflammatory Signaling ◽  
Green Tea Leaves ◽  
Inflammatory Drugs ◽  
Tea Extract ◽  
Immunological Homeostasis ◽  
Light Chain Enhancer

Some coronavirus disease 2019 (COVID-19) patients develop acute pneumonia which can result in a cytokine storm syndrome in response to Severe Acute Respiratory Syndrome coronavirus 2 (SARS-CoV-2) infection. The most effective anti-inflammatory drugs employed so far in severe COVID-19 belong to the cytokine-directed biological agents, widely used in the management of many autoimmune diseases. In this paper we analyze the efficacy of epigallocatechin 3-gallate (EGCG), the most abundant ingredient in green tea leaves and a well-known antioxidant, in counteracting autoimmune diseases, which are dominated by a massive cytokines production. Indeed, many studies registered that EGCG inhibits signal transducer and activator of transcription (STAT)1/3 and nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) transcription factors, whose activities are crucial in a multiplicity of downstream pro-inflammatory signaling pathways. Importantly, the safety of EGCG/green tea extract supplementation is well documented in many clinical trials, as discussed in this review. Since EGCG can restore the natural immunological homeostasis in many different autoimmune diseases, we propose here a supplementation therapy with EGCG in COVID-19 patients. Besides some antiviral and anti-sepsis actions, the major EGCG benefits lie in its anti-fibrotic effect and in the ability to simultaneously downregulate expression and signaling of many inflammatory mediators. In conclusion, EGCG can be considered a potential safe natural supplement to counteract hyper-inflammation growing in COVID-19.

High Quality Green Tea Extract Production from Enzyme Treated Fresh Green Tea Leaves

2008 ◽  
Vol 37 (8) ◽  
pp. 1025-1029 ◽  
Author(s):  
Lan-Sook Lee ◽  
Hwan-Soo Cha ◽  
Jong-Dae Park ◽  
Sung-Hun Yi ◽  
Sang-Hee Kim
Keyword(s):  
Green Tea ◽  
Green Tea Extract ◽  
Tea Leaves ◽  
High Quality ◽  
Green Tea Leaves ◽  
Tea Extract
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