Termosonikasyon Uygulanan Çilek Nektarının Depolama Boyunca Polifenol Oksidaz Aktivitesi ve Fenolik Madde İçeriğindeki Değişimlerin Kinetik Modellenmesi

In this study, some quality changes in the optimally thermosonicated (59°C-455 J g-1) cloudy strawberry nectar during storage were evaluated and modelled. The of pH (3.40-3.78), residual polyphenol oxidase-(PPO) activity (24%-11%), total phenolic-(TP) content (688.7-543.2 mg L-1), monomeric anthocyanin-(TMA) (142.5-84.4 anthocyanin, colorless phenolic compounds analyzed three months at 4°C. significant decrease (54%) which was observed PPO can be related with nectar. A high correlation determined between TP (R2=0.983). While TMA anthocyanin (pelargonidin-3-O-glucoside, pelargonidin-3-O-rutinoside, cyanidin-3-glucoside) decreasing, chlorogenic acid, p-coumaric ellagic kaempferol, quercetin, (±)-catechin (-)-epicatechin increasing days 30 60. Pelargonidin-3-O-glucoside decreased 36% end (k=6.09x10-5 L (mg day)-1). It that increase (R2=0.986), degradations (R2=0.902), (R2=0.968), pelargonidin-3-glucoside (R2=0.858), pelargonidin-3-rutinoside (R2=0.965), gallate (R2=0.871) best fitted to second-order kinetic model. half-time 303 days, while half degrading 99 days.