scholarly journals Characteristics Evaluation of Commercial Fruit Tea Extracts in Korea

2021 ◽  
Vol 19 (4) ◽  
pp. 693-703
Author(s):  
Ah-Ra Hwang ◽  
Myung-Ryun Han ◽  
Ae-Jung Kim

Purpose: We evaluated the physicochemical characteristics and antioxidant activity of 21 types of fruit tea extract that are consumed in Korea. The data were analyzed and curated for the development of processed products using tea in the future.Methods: After extraction using hot water at 70℃, we analyzed the physicochemical properties including color and pH, as well as the antioxidant activity (total flavonoid content, DPPH scavenging activity, and α-glucosidase inhibitory activity).Results: Calamansi tea exhibited the lowest brightness with a beet-red appearance, and a yellowness that was significantly higher in jujube and radish. The pH ranged from 3.04 to 7.18 and most samples were in an acidic state. Of these, the pH of schizandra fruit tea was the lowest at 3.04±0.01. The total flavonoid content was the highest in calamansi at 217.87±1.45 QE/g, whereas that of cacao nibs was the lowest at 29.04±0.70 QE/g. The α-glucosidase inhibitory activity of Chinese quince was the highest at 59.96%±0.22%.Conclusion: We obtained basic data for several fruit tea extracts by analyzing the physicochemical properties and antioxidant activities. We anticipate that these results will represent useful data for blending fruits for tea product development.

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Hongyu Xu ◽  
Gege Hu ◽  
Juane Dong ◽  
Qin Wei ◽  
Hongbo Shao ◽  
...  

In order to screen theCatalpaplant with high antioxidant activity and confirm the corresponding active fractions fromCatalpa ovataG. Don,C. fargesiiBur., andC. bungeiC. A. Mey., total flavonoid contents and antioxidant activities of the extracts/fractions ofCatalpaplant leaves were determined. The determined total flavonoid content and antioxidant activity were used as assessment criteria. Those compounds with antioxidant activity were isolated with silica gel column chromatography and ODS column chromatography. Our results showed that the total flavonoid content inC. bungeiC. A. Mey. (30.07 mg/g·DW) was the highest, followed by those inC. fargesiiBur. (25.55 mg/g·DW) andC. ovataG. Don (24.96 mg/g·DW). According to the determination results of total flavonoid content and antioxidant activity in 3 clones of leaves ofC. bungeiC. A. Mey., the total flavonoid content and antioxidant activity in crude extracts fromC. bungeiC. A. Mey. 6 (CA6) leaves were the highest. Moreover, the results showed that the total flavonoid content and antioxidant activities of ethyl acetate (EA) fraction in ethanol crude extracts in CA6 leaves were the highest, followed byn-butanol, petroleum ether (PE), and water fractions. Two flavonoid compounds with antioxidant activity were firstly isolated based on EA fraction. The two compounds were luteolin (1) and apigenin (2), respectively.


Author(s):  
Yuniar Intan Hartono ◽  
Indah Widyastuti ◽  
Hanna Zaidah Luthfah ◽  
Rosy Islamadina ◽  
Adelin Theresia Can ◽  
...  

Indonesia is a rich country in terms of its biodiversity. Herbs that are widely used tomaintain a healthy body comes from the Zingiberaceae family, including temu mangga. Temu mangga(Curcuma mangga Val. & Zijp) is effective for relieving gastric pain, diarrhea, menstrual pain, acneand ulcers, and increasing appetite. Besides, temu mangga is considered to have antioxidant activitydue to the presence of the phenolic and flavonoid compounds. This study aims to determine thecorrelation and classification of temu mangga from various places based on total flavonoid contentand antioxidant activities. The samples were extracted with methanol, then tested for totalflavonoid content by AlCl3 method and antioxidant activity by DPPH free radical capture method.Analysis was performed using correlation coefficient value and chemometrics PCA (PrincipalComponent Analysis) and CA (Cluster Analysis) to see the relationship between total flavonoidcontent with their antioxidant activity and to see their classification. Total flavonoid content ofmethanolic extract of temu mangga gives a moderate correlation to its antioxidant activity with r =-0.6085 and clustering samples successfully determined by PCA and CA which resulted in 4 groups.Keywords: Curcuma mangga Val. & Zijp, Methanolic Extract, Flavonoid, Antioxidant, PCA, CA


Author(s):  
Raden Bayu Indradi ◽  
Irda Fidrianny ◽  
Komar Ruslan Wirasutisna

Free radicals are atoms or molecules that have one or more unpaired electrons on its outer orbital, highly reactive, and could damage cell inside human body. Human body produce antioxidant to neutralize free radicals, but human ageing and stress oxidative conditions would increase the formation of free radicals, therefore an exogenous antioxidant are needed. Asteraceae family is the largest family among the plant kingdom therefore it has great potential as source of exogeneous antioxidants. The objectives of this research were to determine antioxidant activities of aerial part of elephant’s foot (Elephantopus scaber L.), false daisy (Eclipta alba (L.) Hassk.), Indian pluchea (Pluchea indica (L.) Less), and dandelion (Taraxacum officinale Weber ex F.H Wigg.) using DPPH method, determine total flavonoid and total phenolic content, and analyze correlation between total flavonoid content and total phenolic content with antioxidant activity. Extraction was carried out by reflux with increasing polarity using n-hexane, ethyl acetate, and ethanol respectively. Antioxidant activity was determined by DPPH method. Total flavonoid content was determined using Chang’s method and total phenolic content evaluated using Folin—Ciocalteu reagent. Correlation of total flavonoid content and total phenolic content was analyzed by Pearson’s method. Ethanolic extract of Indian pluchea showed the highest antioxidant activity with IC50 DPPH 16.66 ± 0.08 µg/mL. The highest total phenolic content (23.49 ± 0,56 g QE (Quercetin Equivalent)/100 g) was given by ethyl acetate extract of Indian pluchea, while the highest flavonoid content (16.48 ± 0.25 g GAE (Gallic Acid Equivalent)/100 g) was showed by ethanolic extract of Indian pluchea. Total phenolic content of elephant’s foot, false daisy and Indian pluchea herbs extracts showed significantly negative correlation with their IC50 of DPPH scavenging activities. Indian pluchea herbs extract had the highest antioxidant activity using DPPH method compared to elephant’s foot, false daisy and dandelion herbs. Phenolic compounds were the major contributor in antioxidant activities of elephant’s foot, false daisy and dandelion herbs extracts by DPPH method.


2020 ◽  
Vol 2020 ◽  
pp. 1-8 ◽  
Author(s):  
Aatika Sikandar ◽  
Mengyue Zhang ◽  
Yuanyuan Wang ◽  
Xiaofeng Zhu ◽  
Xiaoyu Liu ◽  
...  

Antioxidants are the radical scavengers that inhibit peroxidation and other free-radical processes, which in return safeguard different organisms from various diseases attributed to radical reactions. Synthetic antioxidants inhibit free radicals, but they also have harmful side effects. However, mycochemicals of natural fungal origin are safe and best substitutes for harmful synthetic chemical antioxidants. The prime objectives of the study include appropriate qualitative and quantitative mycochemical screening, antioxidant potential, and chemical composition of Snef1216 (Penicillium chrysogenum). The study has used aluminium chloride colourimetric method, Folin–Ciocalteu reagent assay, and DPPH (1,1-diphenyl-1-picrylhydrazyl) for analysis of total flavonoid content and phenol content and antioxidant activity, respectively. However, the presence of biologically active compounds was screened through gas chromatography-mass spectrometry (GC-MS). Quantitative analysis demonstrated the existence of flavonoids, glycosides, flavones, saponins, phenols, and catecholic tannins excluding alkaloids, terpenoids, steroids, and gallic tannins. The outcomes exposed total flavonoid content and phenolic content in P. chrysogenum were 85.31 ± 1.23 mg·QE/g and 135.77 ± 1.14 mg·GAE/g, respectively. Snef1216 (P. chrysogenum) displayed the highest free-radical scavenging activity with 63.86% inhibition of DPPH. The analysis confirms that Snef1216 (P. chrysogenum) is an alternative source of natural antioxidants. The obtained data have provided the foundation for its use in agricultural, environmental, and pharmaceutical industries.


Author(s):  
Kalpana S ◽  
Ramakrushna B. ◽  
Anitha S.

Objective: The present study evaluates the antioxidant and α-amylase inhibitory activity of leaf and bark extracts of Phyllanthus indofischeri with methanol and water as solvents. In addition to this, the total phenolic content and total flavonoid content was determined.Methods: The total phenolic and total flavonoid content of the extracts was determined by folin ciocaletus reagent method and aluminium chloride colorimetric method respectively. The antioxidant and α-amylase inhibitory activity were measured by various assays, including α, α-diphenyl-ẞ-dipicryl-hydrazyl (DPPH) free radical scavenging, 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulphonicacid) (ABTS) radical scavenging, superoxide radical scavenging, total antioxidant capacity by phosphomolybdate method and porcine pancreatic α-amylase inhibitory assay. The IC50 values were calculated and compared with standards such as gallic acid, ascorbic acid and α-acarbose.Results: The results illustrated that all the extracts of Phyllanthus indofischeri exhibit significant antioxidant and α-amylase inhibitory activity. Among the extracts, methanolic leaf extract showed high levels of activity followed by bark water extract.Conclusion: Phyllanthus indofischeri extracts had shown antioxidant and α-amylase inhibitory activity. On the basis of these results, Phyllanthus indofischeri can be used as a natural antioxidant and hypoglycemic agent against various disorders related to oxidative stress; and the isolation of bioactive compounds was warranted. 


2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Thandiwe Alide ◽  
Phanice Wangila ◽  
Ambrose Kiprop

Abstract Objective To investigate the effect of cooking temperature and time on the total phenolic content, total flavonoid content and antioxidant activity of aqueous and ethanolic extracts of garlic. Results The mean total phenolic content of fresh garlic were 303.07 ± 6.58 mg gallic acid equivalent per 100 g (GAE/100 g) and 638.96 ± 15.30 mg GAE/100 g of plant material for the aqueous and ethanolic extracts respectively. The mean total flavonoid content 109.78 ± 6.78 mg quercetin equivalent per 100 g (QE/100 g) and 258.47 ± 12.37 QE/100 g for aqueous and ethanolic extracts respectively. Fourier transform infrared spectral data showed absorptions in the range for carboxylic acids, hydroxyl group, esters, and alcohols, confirming the presence of phenols and flavonoids in the extracts. Cooking temperature had a significant effect on total phenolic content and total flavonoid content while cooking time did not have a significant effect on the phytochemicals and antioxidant activity.


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