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Accueil du site → Master → Oman → Compositional analysis, phytochemical stability and health functionality of wild blueberry (Sideroxylon mascatense) at different drying and storage condition.

Sultan Qaboos University (2017)

Compositional analysis, phytochemical stability and health functionality of wild blueberry (Sideroxylon mascatense) at different drying and storage condition.

Al-Hasaniyah, Shaima Juma Abdullah

Titre : Compositional analysis, phytochemical stability and health functionality of wild blueberry (Sideroxylon mascatense) at different drying and storage condition.

Auteur : Al-Hasaniyah, Shaima Juma Abdullah.

Université de soutenance : Sultan Qaboos University

Grade : Master of Science (MS) in Food Science and Nutrition 2017

Résumé partiel
Sideroxylon mascatense is a wild blueberry plant that traditionally called boot in Oman. There is a lack of research on the influence of different processing methods and long-term storage on nutritional quality of blueberry. Therefore, the aims of this study were to determine the physico-chemical characteristics of Sideroxylon mascatense and evaluate the stability of phytochemicals (i.e. polyphenols and flavonoids) during different drying methods and their health functionality (i.e. antitumor activity). Freeze (-20 °C) and air drying (60 and 90 °C) methods were used. The chemical compositions were analyzed according to AOAC methods. The TPC and TFC analyzed using Folin-Ciocalteu reagent and Aluminum chloride colorimetric methods respectively. The stability of phenolic compounds was investigated at different storage temperatures : 90, 70, 60, 40, 20 and -20 °C. The antioxidant potential properties of the blueberries were also evaluated using DPPH and ABTS assay. Moreover, the antitumor activities of blueberry extracts were determined using Alamar blue assay. The moisture content of fresh blueberry flesh and seed were 64.5 and 32.9 g/100 g sample (wet basis). The crude protein and fat were higher in the seeds as compared to fresh flesh. The protein content in all dried samples was higher than the fresh samples. There was a significant decrease of fat from fresh to dried samples with higher loss of lipid at 90 °C. The total estimated carbohydrate in flesh sample was comparable to the freeze-dried samples. Glucose and fructose are the main sugars in boot with higher concentration in air drying at 60 °C. The low pH (i.e. 4.43) indicated that the blueberry can be considered acidic. Blueberry showed good content of phenolic compounds.

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