Promene kvaliteta soka šećerne trske pri pakovanju u različite materijale

Abstract

Packaging materials selected were glass bottle, polyethylene (400 gauge) and polypropylene (350 gauge). Fresh sugarcane juice was pasteurized and processed at 80°C for 15 minutes and stored at 5°C and 30°C in the sterilized packaging materials. The biochemical and microbiological qualities analyzed were total sugars, reducing sugars, total soluble solids, titratable acidity, pH, bacteria, yeast and fungi. The fresh unpasteurized sugarcane juice without addition of preservative last for 4 days when stored at 5°C. Beyond that, the quality deteriorated, which was observed by the colour and flavour change. The juice stored at 30°C become spoilt within a day without any preservative. The quality loss due to biochemical and microbiological parameters were less in glass bottle followed by polyethylene and polypropylene with preservative. Microbial counts (bacteria, yeast, fungi) were increased, during storage of juice. The study revealed that apart from glass bottle, flexible polyethylene and polypropylene packaging materials could also be used to store sugarcane juices without much quality losses.Odabrani ambalažni materijali su bili staklena boca, polietilen (400) i polipropilen (350). Svež sok šećerne trske je pasterizovan, obrađen na 80°C tokom 15 minuta i upakovan na 5°C i 30°C u sterilne materijale za pakovanje. Biohemijske i mikrobiološke osobine koje su analizirane su: ukupni šećeri, redukujući šećeri, ukupne rastvorljive čvrste materije, titraciona kiselost, pH, bakterije, plesni i gljivice. Svež nepasterizovan sok šećerne trske bez dodatka konzervansa održao se 4 dana u skladištu na 5°C. Posle toga kvalitet se pogoršao, što je uočeno promenom boje i ukusa. Sok koji je čuvan na 30°C bez konzervansa pokvario se već prvog dana. Gubitak biohemijskog i mikrobiološkog kvaliteta bio je manji u staklenoj boci, a zatim u pakovanjima od polietilena i polipropilena sa konzervansom. Broj mikroorganizama (bakterije, plesni, gljivice) povećao se tokom skladištenja soka. Studija je pokazala da, pored staklene boce, fleksibilni polietilen i polipropilen takođe mogu da se koriste za pakovanje soka šećerne trske bez značajnog gubitaka kvaliteta