TREND IN SUGAR LOSSES IN POST-HARVESTED CANE

摘要

Sugar loss in seven sugarcane varieties (CoS 767, CoSe 01235, CoSe 01434, CoS 95255, CoS 96268, CoS 98259 and CoSe 98231 was observed under high ambient temperature (37.8°C-39.0°C) after harvest. The magnitudinal trend of brix, sucrose % in juice, purity coefficient, reducing sugar alongwithfree amino acid and protein contents varied among the varieties with the advancement of staling hours (0-96 h). An increasing trend of brix could be observed in all the varieties but the consistent trend of increase could be observed in CoS 98259. The sucrose % in juice though deteriorated in all the varieties but the consistent trend of decrease could be observed in CoS 98259. CoSe 01434, CoSe 01235 and CoS 96268. Generally, after 72 hrs of staling, a rapid fall in purity coefficient was observed in almost all the varieties but varieties CoS 95255 and CoSe 01434 showed relatively minimum and slow loss. Free amino acid contents increased upto 48 hrs and then slowed down which probably indicated the depletion of protein in a rapid way which resulted more free amino acids in cane juice. After 48 h of storage of cane the micro-organism activity might have become more rapid and produced the enzyme in juice fastly, thereby the free amino acid content was observed low while in further staling hours. Concomitantly, the protein content in cane juice was observed in increasing trend upto 72 hrs and thereafter declined. It indicated that some specific type of protein have been formed in cane juice at 72 hrs of staling which increased the protein content upto 72 hrs.