Utilization of some fruits pomace as natural antioxidants to shelf-life of sunflower oil [electronic resource].

Includes references.

Apple, orange and pear pomance a by – products of fruits juice industry are rich sources of fiber and polyphenols. Therefore, the chemical compositions, minerals and fiber fractions were determined in the fruits pomaces. The results showed that the apple pomance the highest protein content 9.86%. Also, the orange and pear pomance powder were contained nearly in crude fiber 8.34 and 6.75% respectively. Moreover, apple pomance was the highest total flavonoids and total phenolic compound (4.15 and 9.72 mg/g). Meanwhile, orange is a good source of vitamin C (0.42 mg/g) and pear pomance was the highest content of total carotenoids 765.51 ug/g. Fractionation of polyphenols content was relatively determined using HPLC to the extracts of apple, orange and pear pomance. Apple pomance extract contained highly amounts of kaempferol, cumarin o- cumaric, rutin and chlorogenic acid. Orange extract contained ferulic, salcylic and o- cumaric acids and pear contained resorcinol, rutin, myricetin, quercetin and kaempferol. Antioxidants activity were determined from extracts of all fruits pomance and compared with butylated hydroxy anisol ( BHA ) as a synthetic antioxidant. The results showed that the BHA represented 92.61%, activity followed by apple pomance extract and orange extract which represented 91.2 and 85.38% activity. Different concentrations (100, 200 and 250 ppm) of all fruits pomance extract compared with BHA at level 250 ppm were added to sunflower oil. The stability of all samples measured the changes in peroxide value during incubation of heating period.

Summary in Arabic.

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