Improving the quality of apple purée
- 140 Downloads
The aim of the present study was to evaluate the effect of addition of 5% of apple peel powder (APP) and sugars (1, 5% of glucose, fructose, sucrose or trehalose) in apple purée on its phenolic composition and antioxidant activity (AOA). Apple purée samples were processed by freezing and freeze-drying. Apple purées containing APP showed higher phenolics, and AOA than the purées without APP. In freeze–dried samples the highest retention of individual polyphenols was achieved with addition of 1% of fructose or trehalose. However, in frozen samples the best impact on polyphenol retention had 5% of sucrose or trehalose. The results from this study showed the antioxidant potential of apple peel as a naturally-sourced antioxidants as well as a new insight into phenol–sugar interaction. These new findings could be of interest for the development of new food products rich in antioxidants which can improve human health.
KeywordsApple purée Apple peel powder Polyphenols Antioxidant activity Trehalose
This research was supported by Croatian Ministry of Science, Education and Sport, Grant 113-1130473-0340. We would like to thank Agricultural Institute (Osijek, Croatia) for providing apples required for experiments and we would like, also, to thank Hayashibara Co. (Japan) for providing us a trehalose.
- Kopjar M, Hribar J, Simcic M, Zlatic E, Pozrl T, Pilizota V (2013) Effect of trehalose addition on volatiles responsible for strawberry aroma. Nat Prod Commun 8:1767–1770Google Scholar
- Kozłowicz K, Kluza F (2006) Experimental characteristics of freezing of apple, pear purée with sweetening substances addition. Acta Agrophys 7:105–112Google Scholar
- Loncaric A, Pilizota V (2014) Effect of variety, growing season and storage on polyphenol profile and antioxidant activity of apple peels. Food Health Dis 3(2):96–105Google Scholar
- Singleton VL, Rossi JA (1965) Colorimetry of total phenolics with phosphomolybdic-phosphotungstic acid reagents. Am J Enol Vitic 16:144–158Google Scholar