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Storage studies of pure strawberry juice preserved with sodium benzoate, potassium sorbate and anti oxidant stored at ambient temperature

. Shakoor Wisal, Ikramullah, Muhammad Ali, Roohul Amin, Khan Niaz Khan and Umair Akbar


Abstract

The purpose of this research was to find out the influence of various sugar concentrartions and preservatives and keeping temperature i. e. ambient temperature (20-25oC) to study the physicochemical and sensory qualities of strawberry juice pres4rerved for twelve months. The samples were marked as, TA0=Strawberry juice (7.5°brix) - no preservatives (control), TA1=Strawberry juice (7.5°brix) with 0.1% sodium benzoate, TA2=Strawberry juice (7.5°brix) with 0.1% potassium sorbate, TA3=Strawberry juice (7.5°brix) with 0.05% sodium benzoate +0.05% potassium sorbate, TA12=Strawberry juice (7.5°brix) - no preservatives (control), TA13=Strawberry juice (7.5°brix) with 0.1% sodium benzoate, TA14=Strawberry juice (7.5°brix) with 0.1% potassium sorbate, TA15=Strawberry juice (7.5°brix) with 0.05% sodium benzoate +0.05% potassium sorbate. Highest increase was reported in Total Soluble Solids (TSS) content by TA1and TA2(20.00%) while lowest increase was reported in TA15(9.33%) during storage. Maximum decline in pHrecorded in TA0 (17.94%) followed by TA12 (16.23%) while lowest decrease was reported in TA15 (8.33%). Maximum increase in titratable acidity reported in TA0 (167.40%) followed by TA2 (140.00%) while minimum increase reported in TA15 (102.38%). Maximum ascorbic acid decreased in TA0 (83.06%) while minimum decrease was recorded in TA15 (56.20%) followed by TA13 (58.73%). Maximum increase in reducing sugar content was reported in TA2 (19.65%) while minimum increase reported in TA15 (13.10%). Maximum decrease in non reducing sugar reported in TA0 (78.87%) followed by TA12 (70.42%) while minimum decrease reported in TA15 (11.26%). Decrease in color was observed for all samples. Flavor deterioration reported in control samples (TA0 and TA12) while treated samples showed minimum loss in flavor during storage. Comparatively better consistency was observed by treated juice. After storage of ninety days, the samples were rejected on the basis of color, flavor, consistency and overall acceptability. Among all the treatments TA0 and TA12 were rejected during storage while TA15 was found better than all other samples  followed by TA13and showed better storage stability than other samples.

Key words:Strawberry juice, benzoate, sorbate, sucrose, ambient temperature.

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