scholarly journals Isolation, selection of Lactobacillus strains with probiotic and antioxidant activities

2019 ◽  
Vol 14 (9) ◽  
pp. 170
Author(s):  
Tran Thi Ngoc Diep ◽  
Nguyen Thuy Huong
Keyword(s):  
Antioxidant Activity ◽  
Lactobacillus Plantarum ◽  
Functional Food ◽  
Antioxidant Activities ◽  
Lactobacillus Brevis ◽  
Fermented Food ◽  
Screening And Identification ◽  
High Antioxidant Activity ◽  
Probiotic Activity ◽  
Selection Of

This study was conducted to collect Lactobacillus strains which having probiotic and antioxidant activities from traditional Vietnamese fermented food. After isolation, screening and identification, we selected two strains, Lactobacillus plantarum and Lactobacillus brevis with probiotic activity and high antioxidant activity. These strains would be the microbiological agent for further studies about probiotic functional food with antioxidant and other valuable activities.

ANTIOXIDANT ACTIVITY OF AMINOTHIAZOL HYDROXYCOUMARIN DERIVATIVES

2013 ◽  
Vol 12 (06) ◽  
pp. 1350058 ◽  
Author(s):  
DAVOOD FARMANZADEH ◽  
MEYSAM NAJAFI
Keyword(s):  
Antioxidant Activity ◽  
Gas Phase ◽  
Antioxidant Activities ◽  
Antioxidant Properties ◽  
Experimental Studies ◽  
Structure Parameters ◽  
Coumarin Derivatives ◽  
Polar Solvents ◽  
B3lyp Method ◽  
High Antioxidant Activity

In this work, the antioxidant properties of the series of 10 aminothiazol hydroxyl coumarin derivatives have been investigated with DFT/B3LYP method. For these antioxidants all reaction enthalpies related to HAT, SPLET, SET-PT mechanisms were calculated in the gas phase and polar solvents. Based on calculated reaction enthalpies (BDE, IP and PA values) the derivations 2, 3 and 4 have the highest antioxidant activity among the studied compounds. Calculated results show that derivations 7, 5 and 6 have the lowest antioxidant activity. The observed theoretical trends for antioxidant activities of studied compounds were similar to trends of previous experimental studies that OH50, TAC50, IC50, CE50 values have been used as a benchmark for measuring the antioxidant properties of these compounds. These results can be useful in synthesis of novel aminothiazol hydroxycoumarin derivatives with high antioxidant activity. Calculated results show that BDE, PA and IP values of studied derivations have linear dependence with structure parameters such as R( O – H ), q( O ) and E HOMO . These observed linear dependences can be useful in synthesis of novel aminothiazol hydroxyl coumarin derivatives with high antioxidant activity. For studied compounds, results indicated that the SPLET and HAT mechanisms represent the thermodynamically preferred mechanism both, in solvent and the gas phase.

scholarly journals Erratum to: Selection of Process Conditions for High Pressure Pasteurization of Sea Buckthorn Juice Retaining High Antioxidant Activity

2014 ◽  
Vol 7 (11) ◽  
pp. 3235-3235
Author(s):  
Zacharias Alexandrakis ◽  
Konstantina Kyriakopoulou ◽  
George Katsaros ◽  
Magdalini Krokida ◽  
Petros Taoukis
Keyword(s):  
Antioxidant Activity ◽  
High Pressure ◽  
Sea Buckthorn ◽  
Process Conditions ◽  
High Antioxidant Activity ◽  
Selection Of

scholarly journals Antioxidative Activities and Active Compounds of Extracts fromCatalpaPlant Leaves

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Hongyu Xu ◽  
Gege Hu ◽  
Juane Dong ◽  
Qin Wei ◽  
Hongbo Shao ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Column Chromatography ◽  
Antioxidant Activities ◽  
Total Flavonoid ◽  
Total Flavonoid Content ◽  
Flavonoid Content ◽  
Crude Extracts ◽  
Catalpa Ovata ◽  
High Antioxidant Activity ◽  
Water Fractions

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.

scholarly journals Natural Phytochemicals and Biological Activities of Wild Grape (Ampelocissus martinii Planch.) Root Extract

2021 ◽  
Vol 33 (3) ◽  
pp. 545-550
Author(s):  
P. Siripipatthana ◽  
P. Srihanam ◽  
A. Sangdee
Keyword(s):  
Antioxidant Activity ◽  
Inhibitory Concentration ◽  
Minimum Bactericidal Concentration ◽  
Antioxidant Activities ◽  
Biological Activities ◽  
Antibacterial Activities ◽  
Root Extract ◽  
Phytochemical Content ◽  
Gram Positive Bacteria ◽  
High Antioxidant Activity

A hydromethanolic root extract of Ampelocissus martinii Planch. (A. martinii) was analyzed by standard methods for its phytochemical content, antioxidant activity, α-amylase and α-glucosidase inhibitions and antibacterial activities. The root extract exhibited the highest content of saponins, followed by phenols, proanthocyanidin and flavonoids, respectively. It showed high antioxidant activity in FRAP and CUPRAC assays. The root extract and standard Trolox had similar antioxidant activities in the DPPH and ABTS assay. It also showed much higher α-amylase and α-glucosidase inhibitory activity compared to standard acarbose. Moreover, the root extract inhibited all tested Gram-positive bacteria with the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of 6.25 mg/mL. These results indicate that A. martinii root can be pharmaceutically used as active ingredients to prevent bacterial infection and radical-related diseases especially diabetes.

scholarly journals The Effects of Extraction Conditions on Extraction Yield and Syringin Content in Producing Standardized Tinospora crispa Aqueous Extract with High Antioxidant Activity

2021 ◽  
pp. 106-120
Author(s):  
Zamree Md Shah ◽  
Mohd Kamal Nik Hasan ◽  
Khairul Kamilah Abdul Kadir ◽  
Mohd Shahidan Mohd Arshad ◽  
Zulkhairi Amom
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Activities ◽  
Pharmaceutical Preparations ◽  
Extraction Yield ◽  
Extraction Time ◽  
Extraction Temperature ◽  
Solid Ratio ◽  
Beneficial Effects ◽  
High Antioxidant Activity ◽  
Optimized Conditions

The herbal plant known as Tinospora crispa is reported to have many beneficial effects on health and has great potential in future to be developed as a health product either in the form of traditional medicine, food supplements or in pharmaceutical preparations. However, so far knowledge on processing procedures to produce quality standardized extracts of this plant to be used in product development has still not widely reported. Therefore, the objective of this study was to determine the optimal extraction conditions for producing a standardized T. crispa aqueos extract (STCAE) with high extraction yield and high syringin content. Experiments were conducted to determine the effects of various extraction conditions involving temperature (25–100 ° C), extraction time (0.5–6 hours) and liquid (water) to solid ratio (5: 1–25: 1 ml of solvent per g stem dry). Using optimized conditions obtained, the extract was standardized based on syringin and was further investigated on its antioxidant activity through DPPH, FRAP and TBA bioassays. Results revealed that the optimum extraction conditions were found to be 1 h extraction time and 15:1 ml g−1 liquid-to-solid ratio. For the extraction temperature, 60°C was found to be the best. STCAE was produced on the basis of the extract to contain with at least 0.4 wt% of syringin. STCAE was found to possess high antioxidant activities through DPPH, FRAP and TBA bioassays.

scholarly journals Dr. PI POLYPHENOL CONTENT, PHYTOCHEMISTRY COMPOSITIONS AND ANTIOXIDANT ACTIVITY OF DIFFERENT EXTRACTS FROM MARINE SPONGE AAPTOS SUBERITOIDES GROWN IN NHATRANG BAY, VIETNAM

2019 ◽  
pp. 80-86
Author(s):  
DANG XUAN CUONG ◽  
VU NGOC BOI ◽  
TRAN KHAC TRI NHAN ◽  
DINH HUU DONG ◽  
THAI MINH QUANG ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Marine Sponge ◽  
Functional Food ◽  
Methanol Extract ◽  
Antioxidant Activities ◽  
Reducing Power ◽  
Chloroform Extract ◽  
Polyphenol Content ◽  
Significant Difference ◽  
Dpph Scavenging

Objective: To investigate the content and antioxidant activities of polyphenol, the correlation between polyphenol content and their antioxidant activities, and phytochemistry compositions of different extracts from marine sponge Aaptos suberitoides commonly found growing in Nhatrang bay, Vietnam orienting application into functional food and pharmacy. Methods: Evaluating the toxicity of antioxidant polyphenol powder preparing from the initial concentrated extract was by the adjusted Behrens Karber method and a correlation between polyphenol content and antioxidant activities basing on the Pearson coefficient in Excel. Separating antioxidant polyphenol content was base on solvents polarization of n-hexane, chloroform, ethanol, ethyl acetate and n-butanol which the quantification of polyphenol content and antioxidant activities, and preliminary phytochemical compositions qualitative. Results: Antioxidant polyphenol powder did not affect mice weight during the assay time of 28 d. Polyphenol content and antioxidant activities got the highest value at chloroform extract in comparison to other extracts, a significant difference (p<0.05) and strong correlation (R2>0.9). Polyphenol content (122.682 mg gallic acid equivalent ml-1), total antioxidant activity (368.183 mg ascorbic acid equivalent ml-1), reducing power activity (24.08 mg FeSO4 equivalent ml-1) and DPPH scavenging (72.48±1.54 %) were the highest values. Alkaloids, flavonoids, steroids, tannins and triterpenoids existed in initial methanol extract. Weakly polarized polyphenol content was 70.27% in comparison to initial methanol extract. Conclusion: Antioxidant polyphenol of sponge Aaptos suberitoides has the potential for application into the field of functional food and pharmaceuticals.

scholarly journals A Facile Electrochemical Analysis to Determine Antioxidant Activity of Bee Pollen

2013 ◽  
Vol 14 ◽  
pp. 31-38 ◽  
Author(s):  
Abdelkrim Rebiai ◽  
Touhami Lanez
Keyword(s):  
Antioxidant Activity ◽  
Cyclic Voltammetry ◽  
Antioxidant Activities ◽  
Antioxidant Properties ◽  
Electrochemical Analysis ◽  
Polyphenolic Compounds ◽  
Bee Pollen ◽  
Cyclic Voltammetry Method ◽  
High Antioxidant Activity ◽  
Phenolic And Flavonoid

The aim of this study was to determine the phenolic and flavonoid content, and antioxidant properties of tow samples of bee pollen harvested from Algeria. The content of total polyphenolic compounds, flavonoids, and antioxidant activity by the cyclic voltammetry method were determined. The contents of polyphenolic compounds was 22.68 mg/g for the pollen from Blida and 21,9 mg/g for Tipaza pollen. High antioxidant activities were found for the cyclic voltammetry method, with values that ranged from 22,3 to 27,63 mg of AAE·g–1 pollen. The bee pollen of Blida showed high antioxidant activity probably due to the high content of polyphenolic compounds present in pollen.

Selection of Process Conditions for High Pressure Pasteurization of Sea Buckthorn Juice Retaining High Antioxidant Activity

2014 ◽  
Vol 7 (11) ◽  
pp. 3226-3234 ◽  
Author(s):  
Zacharias Alexandrakis ◽  
Konstantina Kyriakopoulou ◽  
George Katsaros ◽  
Magdalini Krokida ◽  
Petros Taoukis
Keyword(s):  
Antioxidant Activity ◽  
High Pressure ◽  
Sea Buckthorn ◽  
Process Conditions ◽  
High Antioxidant Activity ◽  
Selection Of
Sign in / Sign up

Export Citation Format

Share Document