30. Physiochemical properties and fatty acid profile of grapes available in Peshawar city

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Ata Ullah Azmat Ali Awan Tasbeeh Ullah Ijaz Ahmad Muhammad Muneeb Neelam Manzoor Salah Uddin Ajmeel Ur Rahman

Abstract

Various types of grapes (Large blue-red, large red, Sunder Khani, middle-sized green, and small yellow) grapes were collected from the local fruits markets of Peshawar City in September 2016 season. The samples were examined for their physicochemical parameters and fatty acid profile. The data showed that pH of all types of grapes was in acidic region i.e. below 7. Higher (26.0) TSS value was recorded for the small yellow type of grapes. Very slight difference was found among the acids values of the analyzed samples of grapes with range of 6 to 7. Sugar ranged from 50 to 75% with the maximum amount seen in large blue red grapes. The berries contained considerable amount of moisture (75.43 to 92.34%) in all samples with maximum amount seen in large blue-red. Na and K were also present in appreciable amounts. Na was high in Sunder khani while the maximum amount of K was seen in large blue red types of grapes. Fatty acid profile i.e. (palmitic, stearic, linoleic, arachidic, palmitoleic and oleic) was investigated by GC gas-chromatography.  Linoleic acid, was found the most abundant acid in fatty acid profile ranging from 66.5% to 73.2% in small yellow grapes. Considerable amount of oleic acid was also present in all samples. The acidic pH, inclusion of K and appropriate amount of moisture made the grapes very attractive fruits that should be studied for other beneficial constituents.


Keywords: Acid value; Fatty acid profile; Grapes; Linoleic acid; Moisture


http://dx.doi.org/10.19045/bspab.2018.70030

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