Strawberry (cv. Senga Sengana) and raspberry (cv. Veten) were processed into jams at 60, 85 or 93 °C and stored at 4 or 23 °C for 8 and 16 weeks. High processing temperature reduced ascorbic acid, total monomeric anthocyanins (TMA) and total phenolics (TP) in strawberries (p<0.05), but not in raspberries. Processing temperature had minor effect on bioactive compounds in the jams during storage (<10% explained variance), but influenced color (L*, °Hue, Chroma), especially L* of the strawberry jams (73.3%). Storage period explained most of the variance in ascorbic acid (>90%), TMA (>42%) and TP (>69%). Storage temperature affected stability of anthocyanins, but had minor effect on ascorbic acid, which declined rapidly independent of storage temperature. Storage temperature also explained most of the variance (>40%) in Chroma of the jams and L* of raspberry jams (53%). Bioactive compounds and color were more stable in raspberry jams than in strawberry jams.
Keywords: Anthocyanin; Ascorbic acid; Color; Cyanidin-3-glucoside (PubChem CID: 197081); Cyanidin-3-rutinoside (PubChem CID: 441674); Cyanidin-3-sophoroside (PubChem CID: 44256720); Jam; Pelargonidin-3-glucoside (PubChem CID: 443648); Processing; Raspberry; Storage; Strawberry; l-Ascorbic acid (PubChem CID: 54670067).
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