Physicochemical properties and antioxidant activity of Doshab (a traditional concentrated grape juice)

Aliakbarlu J., . and Khalili S., . and Mohammadi Sh., . and Naghili H., . Physicochemical properties and antioxidant activity of Doshab (a traditional concentrated grape juice). pp. 367-371. ISSN 22317546

Doshab is a concentrated and shelf-life extended form of grape juice. The present study was outlined to investigate the physicochemical properties including pH titratable acidity soluble solids (Brix) and water activity (aw) as well as total phenolics and antioxidant activity of 19 Doshab samples from different production unites. The antioxidant activities of the samples were assessed by 2 2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity -Carotene bleaching and reducing power assays. The pH values and titratable acidity of Doshab samples were ranged from 5.3 to 6.2 and from 0.165 to 0.622 g per 100 g respectively. In DPPH assay radical scavenging activity of samples was ranged from 27.7 to 82.3. Inhibition percentage (I ) of the linoleic acid oxidation was between 72.2 and 87.2. Total phenolic contents of doshab samples were changed between 1.84 and 4.47 mg of gallic acid equivalent per g of the sample. There was no significant correlation between radical scavenging activity and total phenolic contents. A moderate correlation between I () and total phenolic content as well as between reducing power and total phenolic content was obtained.

Full text available from: Official URL: http://ifrj.upm.edu.my/21%20(01)%202014/52%20IFRJ%...

Abstract

Doshab is a concentrated and shelf-life extended form of grape juice. The present study was outlined to investigate the physicochemical properties including pH titratable acidity soluble solids (Brix) and water activity (aw) as well as total phenolics and antioxidant activity of 19 Doshab samples from different production unites. The antioxidant activities of the samples were assessed by 2 2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity -Carotene bleaching and reducing power assays. The pH values and titratable acidity of Doshab samples were ranged from 5.3 to 6.2 and from 0.165 to 0.622 g per 100 g respectively. In DPPH assay radical scavenging activity of samples was ranged from 27.7 to 82.3. Inhibition percentage (I ) of the linoleic acid oxidation was between 72.2 and 87.2. Total phenolic contents of doshab samples were changed between 1.84 and 4.47 mg of gallic acid equivalent per g of the sample. There was no significant correlation between radical scavenging activity and total phenolic contents. A moderate correlation between I () and total phenolic content as well as between reducing power and total phenolic content was obtained.

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Item Type:	Article
AGROVOC Term:	Physicochemical properties
AGROVOC Term:	Antioxidants
AGROVOC Term:	Grape juice
AGROVOC Term:	Acidity
AGROVOC Term:	Water activity
AGROVOC Term:	Phenolic content
AGROVOC Term:	Antioxidants
AGROVOC Term:	Bleaching
AGROVOC Term:	Inhibition
AGROVOC Term:	Linoleic acid
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:26
URI:	http://webagris.upm.edu.my/id/eprint/21299

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