scholarly journals Gamma irradiation results of total phenolic content and antioxidant capacity of ethanol extract of white tea (Camellia sinensis)

2018 ◽  
Vol 20 (2) ◽  
Author(s):  
Bina Lohita Sari
Keyword(s):  
Antioxidant Capacity ◽  
Total Phenolic Content ◽  
Gamma Ray ◽  
Phenolic Content ◽  
Chemical Constituents ◽  
Ethanol Extract ◽  
Total Phenolic ◽  
White Tea ◽  
Extraction Solvent ◽  
Tea Extract

<em>White tea is produced from tea shoots with simplest processing. This unfermented tea contents a lot of chemical constituents such as polyphenol that present potent antioxidant capacity. In this research, we analyzed total phenolic content and antioxidant capacity of white tea ethanol extract after exposing simplicial with gamma rays doses of 0; 2.5; 5.0; 7.5; 10.0; and 12.5 kGy. Gamma ray irradiation in pharmaceutical can be used as one of the most efficient method to reduce microorganisms. The extraction of simplicia used Microwave-assisted extraction (MAE) with ethanol 60% as the extraction solvent. The determination result of total phenolic levels of white tea extract irradiated at a doses of  0; 2.5; 5.0; 7.5; 10.0; and 12.5 kGy were 121.62; 148.73; 187.28; 161.88; and 162.28 mg GAE/g. The antioxidant capacity value was 16.67; 19.63; 30.08; 25.60; 23.11; 16.15 %. The total phenolic content and antioxidant capacity showed the highest irradiation at 5 kGy dose.</em>

scholarly journals TOTAL PHENOLIC CONTENT AND FLAVONE BIOACTIVITY OF PEANUT HULLS AS ANTIOXIDANT AND ANTIPROLIFERATION TOWARD HELA CANCER CELLS

2017 ◽  
Vol 10 (4) ◽  
pp. 144
Author(s):  
Aika Latifah Alawiyah ◽  
Suminar Setiati Achmadi ◽  
Gustini Syahbirin
Keyword(s):  
Ethyl Acetate ◽  
Antioxidant Capacity ◽  
Cancer Cells ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Ethanol Extract ◽  
Ethyl Acetate Fraction ◽  
Total Phenolic ◽  
Dpph Assay ◽  
Peanut Hulls

Objective: This study aimed to determine the total phenolic content, correlation of it with antioxidant capacity, and peanut hulls as an antiproliferationon Henrietta Lacks (HeLa) cancer cells, which Indonesia has a serious problem in term of cervix cancer.Methods: Peanut hulls were extracted by Soxhlet extraction, ultrasound vibration, and reflux boiling to obtain the best extraction method. The totalphenolic content of the ethanol extract and the ethyl acetate fraction was determined using Folin–Ciocalteu method. The 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay was used to evaluated an antioxidant capacity of both samples. Identification of the isolated flavone was done by ultraviolet spectra and analyzed using liquid chromatography-mass spectrometer. Inhibition of proliferation of HeLa cancer cells was tested for the purified fraction using 3-(4,5-dimethyl thiazole-2-yl)-2, 5-diphenyltetrazolium bromide assay.Results: The results of total phenolic content determination giving 262 (ethanol extract) and 532 (ethyl acetate fraction) mg gallic acid equivalent/g extract, respectively. DPPH assay resulted antioxidant capacity with value of inhibitory concentration 50% (IC) was 36.36 (ethanol extract) and 18.68 (ethyl acetate fraction) µg/mL, respectively. Identification of isolated flavone resulted an apigenin and indicated moderate potency in inhibiting the proliferation of HeLa cancer cells with IC 50 value of 34 µg/mL. 50Conclusions: There was a correlation between the total phenolics with antioxidant capacity of the peanut hulls. The isolated flavone is predominated by apigenin. This isolated compound is potential as antioxidant and inhibiting the proliferation of HeLa cancer cells moderately.Keywords: Peanut hulls, Total phenolic, Antioxidant capacity, Flavone, Apigenin, Henrietta Lacks cancer cells.

scholarly journals Total Phenolic Content, Antioxidant and Antibacterial Activities of Sargassum polycystum of Ethanol Extract from Waters of Kabung Island

2021 ◽  
Vol 9 (3) ◽  
pp. 139
Author(s):  
Ikha Safitri ◽  
W. Warsidah ◽  
Mega Sari Juane Sofiana ◽  
Arie A. Kushadiwijayanto ◽  
T. Novi Sumarni
Keyword(s):  
Total Phenolic Content ◽  
Phenolic Content ◽  
Biological Activities ◽  
Chemical Constituents ◽  
Ethanolic Extract ◽  
Ethanol Extract ◽  
Diffusion Method ◽  
Total Phenolic ◽  
Antioxidant Vitamin ◽  
Dpph Method

Sargassum policystum is one of the genus Sargassum from the brown macroalgae group which has an abundance of chemical constituents of fucoidan, fucoxanthin, phenolic acids and alginate which have important biological activities, such as antioxidants and antibacterials. This species thrives in the waters of Kabung Island, Bengkayang, West Kalimantan and has not been exploited so that it tends to act as a marine weed. This study aimed to determine the total phenolic content of the ethanolic extract of S. policystum and its antioxidant and antibacterial activity. Determination of the total content of phenolic compounds using the Folin Ciocalteu method, antioxidant testing using the DPPH method (2,2-diphenyl-1-picrylhydrazyl) and the indicator of sample color change with the addition of these radicals was measured by UV-Vis spectrophotometer. Antibacterial testing was carried out by the test sample diffusion method and the inhibition of the growth of the test bacteria Staphylococcus aureus and Escherichia coli as test bacteria was indicated by the formation of a clear area around the sample wells. The results showed that the phenol content of the ethanolic extract of S. policystum was 79.8 mg/g extract, its antioxidant activity (IC50) was 98.903 ppm, classified as a strong antioxidant, while the comparison antioxidant, Vitamin C, had an IC50 of 6.26 ppm. The inhibitory ability of the ethanol extract against the test bacteria used was indicated by the formation of the largest inhibition diameter on S. aureus of 12.4 mm and E. coli of 12.0 mm.

EXTRACTION OPTIMIZATION AND ANTIOXIDANT ACTIVITY OF PHENOLIC COMPOUNDS FROM AVOCADO PEEL

2019 ◽  
pp. 49-59
Author(s):  
Nu Linh Giang Ton ◽  
Thi Hoai Nguyen ◽  
Quoc Hung Vo
Keyword(s):  
Antioxidant Activity ◽  
Response Surface Methodology ◽  
Antioxidant Capacity ◽  
Response Surface ◽  
Total Antioxidant Capacity ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Quadratic Model ◽  
Total Phenolic ◽  
Total Antioxidant

Avocado peel has been considered as a potential source of natural antioxidants in which phenolics are among the most important compounds. Therefore, this study aims to optimize the extraction process of phenolics using response surface methodology and evaluate the corresponding antioxidant activity. From the quadratic model, the optimal condition was determined including the ethanol concentration 54.55% (v/v), the solvent/solute ratio 71.82/1 (mL/g), temperature 53.03 oC and extraction time 99.09 min. The total phenolic content and the total antioxidant capacity at this condition with minor modifications were 26,74 ± 0,04 (mg GAE/g DW) and 188.06 ± 1.41 (mg AAE/g DW), respectively. The significant correlation between total phenolic content and total antioxidant capacity was also confirmed. Key words: response surface methodology, central composite rotatable design, total phenolic content, total antioxidant capacity, avocado peel

scholarly journals Optimization of Natural Antioxidants Extraction from Pineapple Peel and Their Stabilization by Spray Drying

Foods ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1255
Author(s):  
Sofia C. Lourenço ◽  
Débora A. Campos ◽  
Ricardo Gómez-García ◽  
Manuela Pintado ◽  
M. Conceição Oliveira ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Capacity ◽  
Spray Drying ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Food Products ◽  
Total Phenolic ◽  
Dry Extract ◽  
Pineapple Peel ◽  
Dpph Method

Pineapple peel still contains an important amount of phenolic compounds and vitamins with valuable antioxidant activity. In this way, the aim of this study was the recovery of the bioactive compounds from pineapple peel using environmentally friendly and low-cost techniques, envisaging their application in food products. From the solid-liquid extraction conditions tested, the one delivering an extract with higher total phenolic content and antioxidant capacity was a single extraction step with a solvent-pineapple peel ratio of 1:1 (w/w) for 25 min at ambient temperature, using ethanol-water (80–20%) as a solvent. The resulting extract revealed a total phenolic content value of 11.10 ± 0.01 mg gallic acid equivalent (GAE)/g dry extract, antioxidant activity of 91.79 ± 1.98 µmol Trolox/g dry extract by the DPPH method, and 174.50 ± 9.98 µmol Trolox/g dry extract by the FRAP method. The antioxidant rich extract was subjected to stabilization by the spray drying process at 150 °C of inlet air temperature using maltodextrin (5% w/w) as an encapsulating agent. The results showed that the antioxidant capacity of the encapsulated compounds was maintained after encapsulation. The loaded microparticles obtained, which consist of a bioactive powder, present a great potential to be incorporated in food products or to produce bioactive packaging systems.

scholarly journals Antioxidant Rich Extracts of Terminalia ferdinandiana Inhibit the Growth of Foodborne Bacteria

Foods ◽  
2019 ◽  
Vol 8 (8) ◽  
pp. 281 ◽  
Author(s):  
Saleha Akter ◽  
Michael E. Netzel ◽  
Ujang Tinggi ◽  
Simone A. Osborne ◽  
Mary T. Fletcher ◽  
...  
Keyword(s):  
Free Radical ◽  
Antioxidant Capacity ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Food Preservation ◽  
Total Phenolic ◽  
Foodborne Bacteria ◽  
Terminalia Ferdinandiana

Terminalia ferdinandiana (Kakadu plum) is a native Australian plant containing phytochemicals with antioxidant capacity. In the search for alternatives to synthetic preservatives, antioxidants from plants and herbs are increasingly being investigated for the preservation of food. In this study, extracts were prepared from Terminalia ferdinandiana fruit, leaves, seedcoats, and bark using different solvents. Hydrolysable and condensed tannin contents in the extracts were determined, as well as antioxidant capacity, by measuring the total phenolic content (TPC) and free radical scavenging activity using the 2, 2-diphenyl-1-picrylhydrazyl (DPPH) assay. Total phenolic content was higher in the fruits and barks with methanol extracts, containing the highest TPC, hydrolysable tannins, and DPPH-free radical scavenging capacity (12.2 ± 2.8 g/100 g dry weight (DW), 55 ± 2 mg/100 g DW, and 93% respectively). Saponins and condensed tannins were highest in bark extracts (7.0 ± 0.2 and 6.5 ± 0.7 g/100 g DW). The antimicrobial activity of extracts from fruit and leaves showed larger zones of inhibition, compared to seedcoats and barks, against the foodborne bacteria Listeria monocytogenes, Bacillus cereus, Methicillin resistant Staphylococcus aureus, and clinical isolates of Pseudomonas aeruginosa. The minimum inhibitory concentration and minimum bactericidal concentration in response to the different extracts ranged from 1.0 to 3.0 mg/mL. Scanning electron microscopy images of the treated bacteria showed morphological changes, leading to cell death. These results suggest that antioxidant rich extracts of Terminalia ferdinandiana fruits and leaves have potential applications as natural antimicrobials in food preservation.

scholarly journals Polyphenols in Coreopsis tinctoria Nutt. fruits and the plant extracts antioxidant capacity evaluation

2014 ◽  
Vol 12 (8) ◽  
pp. 858-867 ◽  
Author(s):  
Christina Zălaru ◽  
Claudia Crişan ◽  
Ioan Călinescu ◽  
Zenovia Moldovan ◽  
Isabela Ţârcomnicu ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Plant Extracts ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Ethanolic Extract ◽  
Optimum Operating ◽  
Total Phenolic ◽  
Extraction Temperature ◽  
Ultrasound Assisted Extraction ◽  
Coreopsis Tinctoria

AbstractThe aim of this research was to investigate the chemical composition of Coreopsis tinctoria Nutt. fruits extract, to highlight the potential of ultrasound assisted extraction in the fast preparation of extracts rich in polyphenols using different solvents (55%, 78% and 96% hydrous ethanol) and to evaluate the antioxidant potential of formulated extracts. LC-MS/MS was used to characterize the ethanolic extract from Coreopsis tinctoria Nutt. dried fruits. The extract contains different flavonoids (marein, flavanomarein, quercetagetin-7-O-glucoside, okanin aurone, leptosidin, luteolin, apigenin) and phenolic acids (chlorogenic acid, caffeic acid). Several parameters that could affect extraction efficiency were evaluated. Finally, this study focused on determination of plant extracts total phenolic content and their antioxidant capacity. The experimental results allowed the selection of the optimum operating parameters leading to the highest total polyphenolic content, expressed as gallic acid equivalents, and avoiding the degradation of phenolic compounds (ethanol 55%; extraction temperature 323.15 K, extraction time 30 min, liquid/solid ratio 20/1). A good relationship between total phenolic content and antioxidant capacity was obtained.

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