scholarly journals Synergistic effect of herbal plant extract (Hibiscus sabdariffa) in maintain the antioxidant activity of decaffeinated green tea from various parts of Assam

2019 ◽  
Vol 56 (11) ◽  
pp. 5009-5016
Author(s):  
Abhijit Das ◽  
Anamika Kalita ◽  
Utpal Raychaiudhuri ◽  
Runu Chakraborty
Keyword(s):  
Antioxidant Activity ◽  
Synergistic Effect ◽  
Green Tea ◽  
Plant Extract ◽  
Hibiscus Sabdariffa ◽  
Herbal Plant

scholarly journals Effect of Brewing Water on the Antioxidant Capacity of Green Tea Infusion with DPPH Assay

2022 ◽  
Vol 2022 ◽  
pp. 1-8
Author(s):  
Qing-Qing Cao ◽  
Yan-Qing Fu ◽  
Cheng-Bin Zhang ◽  
Yan Zhu ◽  
Jun-Feng Yin ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Synergistic Effect ◽  
Metal Ions ◽  
Antioxidant Capacity ◽  
Green Tea ◽  
Ph Value ◽  
Major Contributor ◽  
Dpph Assay ◽  
Tea Infusion ◽  
Selection Of

Brewing water plays a crucial role in flavor and potential healthy functions of tea infusion. In this study, seven water samples with different physicochemical properties were selected to brew green tea. Results showed that the brewing water with higher minerals level and pH value would reduce the yield of catechins in tea infusion, which in turn caused the decrease of antioxidant activity to a large extent. Besides, it was found that EGCG, as a major contributor to the antioxidant activity of green tea infusion, was influenced differently by different metal ions, among which Ca2+/Mg2+ could enhance the antioxidant activity of EGCG solutions with different concentration through synergistic effect, particularly Ca2+, and the effect was more markable at a higher EGCG concentration. These results offered theoretical direction to the selection of tea brewing water for consumers and gave a new sight to the effects of metal ions on the antioxidant capacity of EGCG.

Physiochemical Characteristics and Antioxidant Activity of Jellies Added with Green Tea Woojeon

2018 ◽  
Vol 24 (2) ◽  
pp. 69-75
Author(s):  
Hyeon Jae Yoo ◽  
◽  
Ha Sook Chung ◽  
Keyword(s):  
Antioxidant Activity ◽  
Green Tea

Ginger (Zingiber Officinale) Decreases Antioxidant Activity of Black and Green Tea

2019 ◽  
Vol 14 (5) ◽  
pp. 386-390
Author(s):  
Javad Aliakbarlu ◽  
Surur K. Sadaghiani ◽  
Shadieh Mohammadi
Keyword(s):  
Antioxidant Activity ◽  
Green Tea ◽  
Zingiber Officinale

Synergistic Effect of Metagenome‐Derived Starch‐Degrading Enzymes on Quality of Functional Bread with Antioxidant Activity

2021 ◽  
pp. 2100098
Author(s):  
Seyedeh Fatemeh Sadeghian Motahar ◽  
Maryam Salami ◽  
Shohreh Ariaeenejad ◽  
Zahra Emam‐Djomeh ◽  
Atefeh Sheykhabdolahzadeh Mamaghani ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Synergistic Effect ◽  
Degrading Enzymes ◽  
Functional Bread

Concentration of roselle (Hibiscus sabdariffa L) and sucrose in beverages: Effects on physicochemical characteristics and acceptance

2020 ◽  
pp. 108201322097379
Author(s):  
Jahir Antonio Barajas-Ramírez ◽  
Ana Luisa Gutiérrez-Salomón ◽  
Sonia Guadalupe Sáyago-Ayerdi
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
High Intensity ◽  
Physicochemical Characteristics ◽  
Hibiscus Sabdariffa ◽  
Color Parameters ◽  
Low Intensity ◽  
Red Color

The calyces of roselle ( Hibiscus sabdariffa L.) are used to make a refreshing drink with high content of anthocyanins and other phenolic compounds, although the process for obtaining the beverage is not standardized. In this research it was determined physicochemical characteristics, total soluble polyphenols content, antioxidant activity and acceptance for beverages prepared by decoction at four concentrations of calyces in water (1.0, 2.5, 5.0 and 10.0%) and two concentrations of sucrose (11 and 16%). Color parameters in beverages permitted to describe them as red, which turned darker as the content of hibiscus increased. Total soluble polyphenols content and antioxidant activity were directly correlated with content of calyces in beverages and inversely correlated with pH, which means that beverages with higher content of calyces could be perceived as more acidic and more intense in characteristics associated with hibiscus presence, such as acid, astringent and the presence of intense dark red color, although the higher concentration of sucrose might have contributed to mask slightly the sourness and astringency. Acceptance for hibiscus beverages allowed to observe two segments of consumers, high-intensity and low-intensity likers but both confluence in overall liking values for beverages prepared with 2.5% calyces and 16% sucrose.

Enzymatic Preparation of Kaempferol from Green Tea Seed and Its Antioxidant Activity

2006 ◽  
Vol 54 (8) ◽  
pp. 2951-2956 ◽  
Author(s):  
Jun Seong Park ◽  
Ho Sik Rho ◽  
Duck Hee Kim ◽  
Ih Seop Chang
Keyword(s):  
Antioxidant Activity ◽  
Green Tea ◽  
Enzymatic Preparation

scholarly journals Thin-layer hydration method to prepare a green tea extract niosomal gel and its antioxidant performance

2021 ◽  
Vol 68 (1) ◽  
pp. 126-136
Author(s):  
U. Chasanah ◽  
N. Mahmintari ◽  
F. Hidayah ◽  
F.A. El Maghfiroh ◽  
D. Rahmasari ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Thin Layer ◽  
Green Tea ◽  
Chorioallantoic Membrane ◽  
Entrapment Efficiency ◽  
Physical Characteristics ◽  
Green Tea Extract ◽  
Gelling Agent ◽  
Niosomal Gel ◽  
Tea Extract

Abstract This study aimed to prepare a niosomal gel of green tea (Camellia sinensis) extract containing catechins, mostly epigallocatechin-3-gallate (ECGC), as a potent antioxidant. Niosomes can increase EGCG's stability and penetration into the skin for a better therapeutic effect. Niosomes were prepared by a thin-layer hydration method, were evaluated for their vesicle shape, particle size, polydispersity index, zeta potential and entrapment efficiency, and then incorporated into gels using sodium alginate as a gelling agent. Three niosomal gel formulations were prepared with different concentrations of niosomes green tea extract. Afterwards, organoleptic properties, chemical and physical characteristics, antioxidant activity, and stability and irritability of the niosomal gels were investigated. The different concentrations of green tea extract had a significant effect on the physical characteristics, but not on the chemical ones. Its antioxidant activity was determined using the 1,1-diphenyl-2-picrylhydrazyl (DPPH) scavenging method. The 50% extract green tea niosomes gel showed the highest inhibition value (25.13%). The stability was determined by freeze–thaw and real-time methods; they showed a decrease in pH, but still within the pH range of skin. The irritability test used was the Hen's Egg Test-Chorioallantoic Membrane (HET-CAM) method, which showed no irritation for all formulas. In conclusion, 50% green tea extract niosomes gel results showed it to be the best formulation with optimal antioxidant results.

scholarly journals Optimization of HIB Value Combination of Tween 60 and Span 80 on Cream Formulation of Ethanol Extract of Green Tea Leaves (Camellia Sinensis L.)

2018 ◽  
Vol 23 (3) ◽  
pp. 124
Author(s):  
Fransiska Lisa Anindya Putri ◽  
Akhmad Kharis Nugroho ◽  
Erna Prawita Setyowati
Keyword(s):  
Antioxidant Activity ◽  
Green Tea ◽  
Camellia Sinensis ◽  
Ethanol Extract ◽  
Tea Leaves ◽  
Lattice Design ◽  
Dpph Method ◽  
Green Tea Leaves ◽  
Span 80 ◽  
Tween 60

Green tea (Camellia sinensis L.) is known to have ability to protect skin against free radicals. This is supported by polyphenol compound catechin. This research aims to determine the optimum Hydrophilic-Lipophilic Balance (HLB) value of Tween 60 and Span 80 compositions on the optimum cream formula of ethanol extract of green tea leaves. Tea leaves are extracted by macerating using 70% ethanol. Catechin in extract is known from Thin Layer Chromatography (TLC) test with silica gel 60 F254 as stationary phase and ethyl acetate:aquadest:formic acid (18:1:1 v/v) as mobile phase. Antioxidant activity is determined by 2,2-Diphenyl-1-picryhydrazyl (DPPH) method and value of Inhibition Concentration 50% (IC50) is then calculated. Formula optimization using Design Expert® version 7.1.5 (DX 7) software, Simplex Lattice Design (SLD) method with two components Tween 60 and Span 80. Cream is characterized according to physical properties organoleptic, homogeneity, viscosity, pH, spreadability, adhesiveness, and cream type. The optimum formula obtained is then tested for physical stability for 4 weeks at room temperature (28±2°C) and data are statistically analyzed using one-way ANOVA. The extract contains catechin proved with Retention factor (Rf) value 0.8 and has antioxidant activity with IC50 value 56.35 ppm. 6.4% Tween 60 and 3.6% Span 80 result an optimum HLB value 11.1. It has viscosity 2897.50±35.94 mPa.s, spreadability 18.44±0.06 cm2, adhesiveness 0.85±0.05 seconds, and pH 4.530±0.002. Statistical test shows that the cream is significantly altered at pH, but does not significantly change in viscosity, spreadability, and adhesiveness after being stored for 4 weeks.

scholarly journals Pharmacognostical, Phytochemical, Antioxidant and Antimicrobial Activity of Costus woodsonii

2019 ◽  
pp. 53-59
Author(s):  
Mukesh S Sikarwar ◽  
Chew Khai Szeek ◽  
Neeraj Paliwal
Keyword(s):  
Antimicrobial Activity ◽  
Antioxidant Activity ◽  
Plant Extract ◽  
Total Phenolic Content ◽  
Leaf Extract ◽  
Phenolic Content ◽  
Total Phenolic ◽  
Phytochemical Analysis ◽  
Concentration Test ◽  
Antioxidant And Antimicrobial Activity

Background: Herbal medicine mostly contains wide range of chemical compounds responsible for medicinal therapeutic use. Costus woodsonii is commonly called as Red Button Ginger and synonyms of the botanical name are Costus spiralis, Alpinia spiralis and Costus pisonis. In Malay, it is known as Setawar Halia Merah. In Chinese, it is known as Hong Bi Qiao Jiang. Objective: This research was conducted to study the pharmacognostical, phytochemical, antioxidant and antimicrobial activity of C. woodsonii leaf extracts. Method: Macroscopy, microscopy, phytochemical analysis, thin layer chromatography, antioxidant activity and antimicrobial activity of C. woodsonii leaf were carried out. Total flavonoids were estimated in the leaf extract. The total phenolic content of C. woodsonii leaf was determined using Folin-Ciocalteu reagent. The antioxidant activity of leaf extract of C. woodsonii was determined by performing DPPH radical scavenging. The microbial activity was determined by Well diffusion test, MIC (Minimum Inhibitory Concentration) test and MBC (Minimum Bactericidal Concentration) test. Result and Discussion: C. woodsonii belongs to costaceae with elliptical green leaves. Till now are no extensive studies on C. woodsonii. Preliminary phytochemical analysis revealed the presence of flavonoid, steroid, fat, phenol, tannin and mucilage in leaf extract. Physicochemical studies further revealed the ash value of leaf as 8.7%. Among the three extractions, alcohol extractive values showed the highest as 13%. Loss on drying at 105 degree Celsius in leaf was found to be 12.67%. The plant extract showed total phenolic content of 7.941 mg GAE/g at concentration of 5µg/ml. As for flavonoids content, plant extract showed 21.7 mg RE/g at concentration of 200µg/ml and 43.4 mg RE/g at concentration of 400µg/ml. For antioxidant activity, the plant extract showed weak antioxidant activity in DPPH scavenging activity assay. For antimicrobial test, the leaf extract of C. woodsonii showed weak antimicrobial activity. Conclusion: From this study, it can conclude that C. woodsonii leaf extract possess weak antioxidant activity and weak antimicrobial activity which need to be further validated by using more antioxidant assays and antimicrobial tests.

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