Effects of Infusion and Storage on Antioxidant Activity and Total Phenolic Content of Black Tea

Chang, Moo Ung; Lin, Yin-Yi; Chang, Yu‐Chia; Wen-ying, Huang; Lin, Wen-Shin; Chen, Cheng-You; Huang, Shu‐Ling; Lin, Yung‐Sheng

doi:10.3390/app10082685

Cited by 38 publications

(20 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…DPPH scavenging activity was measured spectrophotometrically according to the method reported in previous papers [27][28][29][30][31][32]. The bitter gourd sample (2 mL juice sample) and the 0.08 mg/mL DPPH solution prepared with methanol (2 mL) were mixed together.…”

Section: 1-diphenyl-2-picrylhydrazyl Scavenging Ability Assaymentioning

confidence: 99%

See 1 more Smart Citation

Effects of Storage Time and Temperature on Antioxidants in Juice from Momordica charantia L. and Momordica charantia L. var. abbreviata Ser.

Lin

Wen-ying

et al. 2020

Molecules

Self Cite

View full text Add to dashboard Cite

This study determined the antioxidant activities of juice from Momordica charantia L. (MC) and MC var. abbreviata Ser. (MCVAS) by analyzing 1,1-diphenyl-2-picrylhydrazyl (DPPH) scavenging ability, ferric reducing power (FRP), and total phenolic content (TPC). The effects of storage time and storage temperature on these antioxidant activities were investigated. Liquid chromatography–mass spectrometry was conducted to identify the major components of MC and MCVAS. The results revealed that the antioxidant activity of MCVAS was better than that of MC, possibly because of richer components of MCVAS. For MC and MCVAS, the scavenging concentrations of 50% DPPH were 3.33 and 1.19 mg/mL, respectively; moreover, the FRP values were 68.93 and 118.14 mg ascorbic acid equivalent/g dry weight, respectively; and the TPC values were 8.15 and 11.47 mg gallic acid equivalent/g dry weight, respectively. The antioxidant activities of MC and MCVAS decreased with storage time. High storage temperature decreased antioxidant activity more quickly than a low temperature. In addition, MC had exhibited a faster decline in DPPH scavenging ability and FRP than MCVAS during 24-day storage, but no difference was observed in TPC.

show abstract

Section: 1-diphenyl-2-picrylhydrazyl Scavenging Ability Assaymentioning

confidence: 99%

“…TPC was determined according to the Folin-Ciocalteu colorimetric assay following the method described in previous reports [28][29][30][31][32][33]. The bitter gourd sample (1 mL juice sample) was added to 1 mL of 1N Folin-Ciocalteu reagent and 0.8 mL of 7.5% Na 2 CO 3 solution.…”

Section: Determination Of Total Phenolic Contentmentioning

confidence: 99%

Effects of Storage Time and Temperature on Antioxidants in Juice from Momordica charantia L. and Momordica charantia L. var. abbreviata Ser.

Lin

Wen-ying

et al. 2020

Molecules

Self Cite

View full text Add to dashboard Cite

show abstract

“…Black tea extract owes its antioxidant properties mainly to the presence of polyphenols [ 64 ]. Its concentration depends on many factors related to the processing of the leaves but also to the process of their infusion including the pH of the water used, the temperature, and the infusion time [ 65 ]. In this study, the antioxidant activity of black tea extract was calculated as 453.70 mM Trolox based on the ABTS assay.…”

Section: Resultsmentioning

confidence: 99%

Gallic Acid Based Black Tea Extract as a Stabilizing Agent in ZnO Particles Green Synthesis

et al. 2021

View full text Add to dashboard Cite

In this work, zinc oxide particles (ZnO NPs) green synthesis with the application of black tea extract (BT) is presented. A thorough investigation of the properties of the extract and the obtained materials was conducted by using Fourier transform infrared spectroscopy (FTIR), liquid chromatography-mass spectrometry (LC-MS), X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and quadrupole mass spectroscopy (QMS). The obtained results indicated that the amount of used BT strongly influenced the morphology, chemical, and crystalline structure of the obtained particles. The investigation demonstrated that the substance present in black tea (BT) extract, which was adsorbed on the ZnO surface, was in fact gallic acid. It was found that gallic acid controls the crystallization process of ZnO by temporarily blocking the zinc cations. Additionally, these organic molecules interact with the hydroxide group of the precipitant. This blocks the dehydration process stabilizing the zinc hydroxide forms and hinders its transformation into zinc oxide. Performed measurements indicated that obtained ZnO particles have great antioxidant and antimicrobial properties, which are significantly correlated with ZnO–gallic acid interactions.

show abstract

“…The absorbance of the mixture is measured at 760 nm in triplicate for 30 min. Gallic acid as a standard and total Phenolic Content is expressed as an equivalent of Gallic acid per gram of extract 24 .…”

Section: Quantitative Estimation Of Phytochemicalsmentioning

confidence: 99%

Untitled

2021

IJPSR

View full text Add to dashboard Cite

Our present study aims at analyzing and comparing the antioxidant, anti-inflammatory and phytochemical property of betel leaves from two different domains of Karnataka that includes the Western Ghats and the Northern region. Initially, the ethanol extracts of all four samples (two from each domain) were prepared and checked for their anti-inflammatory and antioxidant activity. As a result, the betel leaf extract from the western region showed good antioxidant activity and a significant anti-inflammatory activity when compared with the standard Gallic acid. In connection to this, the phytochemical content such as Alkaloids, Tannins, Flavonoids, and Phenols showed positive in all four extracts, but the quantification studies showed that the extracts from the Western Ghats had a higher quantity of alkaloids and phenols when compared to the samples from northern regions. These results imply that the presence of functionally important groups depends on the composition of the soil in which they grow in. Hence having good biologically important activity in them can prove beneficial for their role towards formulating a cost-effective lead drug from the extracts with no side effects. INTRODUCTION:Research on new natural antioxidants and anti-inflammatory agents has increased interestingly over the past few years. The production of reactive oxygen species (ROS), oxidative stress, and inflammation have a strong connection with various chronic diseases like neurodegenerative diseases, cardiovascular disease, osteoporosis and cancer, etc. 1, 2 . Hence, the external supply of antioxidants and antiinflammatory agents can prevent and protect the body from the damaging effect of free radicals and in turn prevent the occurrence of many diseases 3 .

show abstract

Effects of Infusion and Storage on Antioxidant Activity and Total Phenolic Content of Black Tea

Cited by 38 publications

References 36 publications

Effects of Storage Time and Temperature on Antioxidants in Juice from Momordica charantia L. and Momordica charantia L. var. abbreviata Ser.

Effects of Storage Time and Temperature on Antioxidants in Juice from Momordica charantia L. and Momordica charantia L. var. abbreviata Ser.

Gallic Acid Based Black Tea Extract as a Stabilizing Agent in ZnO Particles Green Synthesis

Untitled

Contact Info

Product

Resources

About