scholarly journals Physiochemical Responses of the Kernel Quality, Total Phenols and Antioxidant Enzymes of Walnut in Different Forms to the Low-Temperature Storage

Foods ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 2027
Author(s):  
Yanping Ma ◽  
Chaoye Wang ◽  
Chaobin Liu ◽  
Jiawei Tan ◽  
Huiling Ma ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Enzyme ◽  
Peroxide Value ◽  
Frozen Storage ◽  
Acid Value ◽  
Antioxidant Enzyme Activities ◽  
Total Antioxidant Activity ◽  
Total Phenols ◽  
Kernel Quality ◽  
Total Antioxidant

Fresh walnut is obtaining high attention due to its pleasant taste and health benefits. This study aimed to evaluate the influence of storage temperatures (0 °C and −20 °C) on the kernel quality, total phenols, and antioxidant enzyme activities of walnuts in three forms (fresh kernels, walnuts with green husk, and walnuts with shell). For a short storage within 3 months at 0 °C, the results revealed that walnuts with green husk provided a better walnut kernel quality resulting from its lower acid value and peroxide value, together with a higher total phenol content and total antioxidant activity, compared with other forms of walnuts. In comparison, frozen storage at −20 °C for a long duration (up to 10 months), found that walnuts with shell showed advantages in improving the kernel quality (fatty acid content, total phenols, and total antioxidant activity) and antioxidant enzyme (peroxidase, catalase, and superoxide dismutase) activities in the kernels, leading to an acceptable range of acid value and peroxide value, compared with other forms of walnuts. Thus, frozen storage at −20 °C showed a potential application in maintaining the walnut kernel quality, especially the walnuts with shell.

scholarly journals Effect of post harvest ripening on bioactive secondary metabolites and antioxidant activity in mango cv. Amrapali

2018 ◽  
Vol 13 (2) ◽  
pp. 152-158
Author(s):  
B M Muralidhara ◽  
G L Veena ◽  
S Rajan ◽  
A K Bhattacherjee ◽  
Pavan Kumar Malav
Keyword(s):  
Antioxidant Activity ◽  
Total Flavonoids ◽  
Total Antioxidant Activity ◽  
Total Phenols ◽  
Fruit Peel ◽  
Total Carotenoids ◽  
Post Harvest ◽  
Total Antioxidant ◽  
Mango Peel ◽  
Ripe Stage

Mango possesses many bioactive phytonutrients at ripe stage which boost our immune systemagainst many diseases. Post harvest ripening plays a major role in changes in those bioactivephytochemicals and their antioxidant activity. Hence, the present study was undertaken toassess the changes in bioactive phytonutrients and total antioxidant activity during ripeningof mango cv. Amrapali. The fruits were analyzed for total antioxidants, total phenols, totalflavonoids and total carotenoids from the day of harvest to its deterioration. Fruit peel andpulp color was measured with SPH850 spectrophotometer on the basis of the CIE LAB colorsystem (L*, a* and b*). The results revealed that total phenols (36.11 to 66.53mg GAE 100g-1),total flavonoids (14.33 to 34.67mg QE 100g-1), total carotenoids (2.23 to 11.47mg 100g-1) andtotal antioxidant (0.37 to 0.76 mmol Trolox 100g-1) activity increased gradually from day one toninth day after harvest and decreased slightly thereafter up to eleventh day of harvest excepttotal carotenoids, which remained constant. Strong correlations between total phenols (0.94),total flavonoids (0.86) and total carotenoids (0.97) with total antioxidant activity were noticed.Positive relationship between total carotenoids and L*, a*, b* values in mango peel and pulpduring ripening was also observed. It can be concluded that ripening affected the compositionof bioactive phytonutrients and their antioxidant activity in mango andmaximum nutraceuticalscontents were noticed from seven to nine days after harvest.

Effects of γ-irradiation on antioxidant activity in soybean seeds

2009 ◽  
Vol 4 (3) ◽  
pp. 381-386 ◽  
Author(s):  
Dubravka Štajner ◽  
Boris Popović ◽  
Ksenija Taški
Keyword(s):  
Antioxidant Activity ◽  
Protein Content ◽  
Enzyme Activities ◽  
Soluble Protein ◽  
Antioxidant Enzyme Activities ◽  
Soybean Seeds ◽  
Total Antioxidant Activity ◽  
Soluble Protein Content ◽  
Γ Irradiation ◽  
Total Antioxidant

AbstractThere are some reports that low doses of γ-irradiation could induce antioxidant activities in plant material, including soybean. Irradiation, required for the inactivation of some pathogens and induction of mutations, may have adverse effects on sensorial, nutritional and antioxidant qualities. The effects of different γ-irradiation doses (100–200 Gy) on antioxidant properties of soybean seeds was investigated. In this study, we report the results obtained by analysis of antioxidant enzyme activities, reduced glutathione, malonyldialdehyde (MDA) and hydroxyl (HO−) radical quantities, soluble protein content, and total antioxidant activity in irradiated soybean seeds. Antioxidant enzyme activities were affected due to high irradiation intensity. Significant changes of total antioxidant activity and MDA and HO.quantities were observed only under the highest irradiation dose, with a 15.7% reduction in total antioxidant activity, MDA quantity increase of 21.6%, and HO− radical quantity increase of 79.3% compared to the non-irradiated control. The total soluble protein content increased slightly.

Diurnal changes in the total antioxidant activity of human saliva

2007 ◽  
Vol 33 (3) ◽  
pp. 375-376 ◽  
Author(s):  
M. F. Borisenkov ◽  
L. A. Erunova ◽  
E. M. Lyuseva ◽  
N. V. Pozdeeva
Keyword(s):  
Antioxidant Activity ◽  
Human Saliva ◽  
Diurnal Changes ◽  
Total Antioxidant Activity ◽  
Total Antioxidant

scholarly journals Biochemical study of hepatoprotective collection of plant origin

2019 ◽  
Vol 59 (7) ◽  
pp. 134-141
Author(s):  
Anatoly A. Lapin ◽  
◽  
Irek G. Garifullin ◽  
Valery N. Zelenkov ◽  
◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Liver Diseases ◽  
Biochemical Study ◽  
Water Extract ◽  
Total Antioxidant Activity ◽  
Plant Origin ◽  
Treatment And Prevention ◽  
Total Antioxidant ◽  
The Individual ◽  
Metabolic Regulators

The article presents the results of biochemical studies of the total antioxidant activity of the hepatoprotective collection of plant origin and its individual components, which show that it consists of birch leaves (Betulae folia), tansy flowers (Tanaceti flores), phytohepatol No. 2 (choleretic collection No. 2) and individual its components have pronounced antioxidant activity. More antioxidant activity founded in tansy and true hepatoprotective collection. Comparative tests of the flowers of meadowsweet, with the highest antioxidant activity, showed the promise of their use in the collections of medicinal plants as effective natural metabolic regulators. The total antioxidant activity of the water extract collection at 13.56% rel. exceeded the calculated value obtained by summing the activities of the individual components of the collection, which indicates the presence of synergism in their action, which may be of value for use in the treatment and prevention of liver diseases. When all components of the drug collection are finished, the indicator increases by 11-24 % rel., which indicates the thermal stability of the antioxidant substances that make up their composition. In the oxidation of aqueous extracts of the components of hepatoprotective collection with hydrogen peroxide, the most stable were antioxidants of birch leaves. It was found that collection only at a ratio of 7.7 g per liter of water shows synergism (15 % rel.), and the rest of all the samples we tested are antagonistic. The detected increase in the antioxidant activity of the new collection compared with the effects of its individual components allows us to consider it as a promising dosage form for use in the treatment and prevention of liver diseases.

Sign in / Sign up

Export Citation Format

Share Document