ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Effect of post-harvest treatments on the level of glucosinolates in broccoli.

Rodrigues, A. S.; Rosa, E. A. S.;

Journal of the Science of Food and Agriculture Year: 1999 Vol: 79 Issue: 7 Pages: 1028-1032 Ref: 26 ref.

1999

บทคัดย่อ

Glucosinolate pattern and levels were examined in the principal and secondary inflorescences of fresh broccoli cv 'Tokyodome' after being submitted to some situations which are likely to occur during or after harvest: room temperature ( plus or minus 20 deg C) for 5 days, kept in the fridge at 4 deg C for 5 days, and frozen after blanching. Another set of material was harvested 5 days later, simulating a post-maturation stage, and analysed. The highest total glucosinolate content was found at commercial maturation with 20 888 and 20 355 micro mol/kg dry weight (DW) in the principal and secondary inflorescences, respectively. Keeping the inflorescences at room temperature caused the most significant (P<0.05) reductions in total and individual glucosinolates, except for 4-hydroxyindol-3-ylmethyl-, 2-hydroxy-2-phenylethyl- and 2-phenylethyl-, compared to the other situations. The highest levels (10 925 micro mol/kg DW) of 4-methylsulphinylbutyl-, the precursor of the anti-cancer isothiocyanate sulp

horaphane, were found in the inflorescences freshly harvested at commercial stage. Refrigeration at 4 deg C and freezing were shown to be the best preservation processes for maintaining high levels of these and other glucosinolates in contrast with the other situations.