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Effect of harvest time on physico-chemical properties and bioactive compounds of pulp and seeds of grape varieties

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Abstract

In this study, physicochemical properties and bioactive compounds of three grape varieties (Cardinal, Müşküle and Razaki) harvested at the three different harvest times (on time, one and two weeks earlier) were investigated. The highest antioxidant activity, total phenolic and flavonoid contents were observed in Razaki pulp and these were 82.854%, 127.422 mg/100 g, 3.873 mg/g, respectively. The contents of bioactive compounds in grape seeds were found higher than those in pulps. Similarly, seed of Razaki had higher antioxidant activity (91.267%) and total phenolic content (477.500 mg/100 g) when compared to results of other varieties. The key phenolic compounds of all grape variety and seeds were gallic acid, 3,4-dihydroxybenzoic acid, (+)-catechin ve 1,2-dihydroxybenzene. The oil content of grape seeds ranged from 8.50% (Razaki harvested one week ago) to 19.024% (Müşküle harvested one week ago). The main fatty acids of grapeseed oils were linoleic, oleic and palmitic acids. In addition, the oil of Razaki seeds was rich in tocopherols when compared to the other varieties.

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Acknowledgements

The authors extend their appreciation to the International Scientific Partnership Program ISPP at King Saud University for funding this research work through ISPP# 0015.

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Correspondence to Mehmet Musa Özcan.

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Özcan, M.M., Juhaimi, F.A., Gülcü, M. et al. Effect of harvest time on physico-chemical properties and bioactive compounds of pulp and seeds of grape varieties. J Food Sci Technol 54, 2230–2240 (2017). https://doi.org/10.1007/s13197-017-2658-9

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  • DOI: https://doi.org/10.1007/s13197-017-2658-9

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