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Asian Journal of Agricultural Research
Year: 2011  |  Volume: 5  |  Issue: 6  |  Page No.: 283 - 291

Evaluation of Nutritive, Antioxidant and Mineral Composition of Two Newly Developed Varieties of Strawberry (Fragaria ananassa) and their Antimicrobial Activity and Brine Shrimp Toxicity Study

Subodh Kumar Sarkar, Ujjal Sen, Monoranjan Dhar, Nurul Absar and M. Khairul Islam    

Abstract: Although strawberry is produced mainly in the cold weather but recently it is a newly introduced crop in the subtropical country like Bangladesh by tissue culture technique. It is not only the excellent sources of Vitamin C, β-Carotene, dietary fiber and some other nutrients but it has also several medicinal importances for human health and nutrition as reported by researchers in different countries other than Bangladesh. The major nutrient contents as well as minerals and vitamins of two varieties, Varaity-1 (Long Conic) and Variety-2 (Globose Conic) of strawberries were analyzed. The result revealed the presence of nutrient constituent among the two varieties, Varaity-1 (Long Conic) and Variety-2 (Globose Conic) of strawberries comprising Total sugar (3.15±0.01 and 2.5±0.02%), Reducing sugar (0.0335±0.01 and 0.048±0.01%), Non-reducing sugar (3.12±0.01 and 2.4±0.01%), Starch (0.395±0.02 and 0.685±0.04%), Water soluble protein (0.785±0.01 and 0.986±0.01%), Total protein (1.2±0.02 and 1.5±0.02%), fat (0.4±0.01 and 0.6±0.02%), Vitamin C (116±0.32 and 179±0.52 mg%), Beta-carotene (3.71±0.25 and 4.15±0.30 μgm%) and minerals such as Magnesium (17.35±0.01 and 17.76±0.01 mg%), Calcium (6.40±0.20 and 11.36±0.40 mg%), Potassium (38.00±0.20 and 43.00±0.01 mg%), Copper (0.1365±0.02 and 0.0275±0.01 mg%), Iron (0.12±0.02 and 0.5415±0.01 mg%), Zinc (0.092±0.01 and 0.049±0.03 mg%), Phosphorous (0.718±0.01 and 0.627±0.02 mg%) and Sulphur (5.56±0.20 and 5.735±0.22 mg%), respectively. Results of present study suggest that Strawberry is a good source of sugar, anti-oxidants and minerals and among both the varieties, Variety-2 (Globose Conic) is rich of sugar, total protein, water soluble protein, Vitamin C, Beta-carotene, Magnesium, Calcium, Potassium, Iron and Sulphar. In this study, the aqueous extract of two varieties (Long Conic and Globose Conic) of strawberry was tested for anti-microbial activity by disc diffusion method and cytotoxicity by brine shrimp nauplii. From the results, it was found that the aqueous extract of both varieties of strawberry revealed anti-microbial activity against gram positive and gram negative bacteria. It was also found that the aqueous extract of two varieties of strawberry was not shown cytotoxic activity. Even though, the aqueous extract of two varieties of strawberry was not shown toxicity on brine shrimp nauplii but they are showing anti-bacterial activity against gram positive and gram negative bacteria. This result clearly indicates the presence of potent bioactive principles in this aqueous extract of both varieties of strawberry which suggests a need to isolate, purify and evaluate active constituents responsible for this anti-microbial activity.

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