TRYPSIN-INHIBITORS AND PHYTIC ACID IN OIL-EXTRACTED MEALS FROM SEEDS OF SEVERAL BRASSICA SPECIES AND OF SINAPIS-ALBA

A total of 124 seed samples representing strains and cultivars of Bras sica napus, B. rapa, B. juncea, B. carinata, and Sinapis alba were sel ected for assays of trypsin inhibitor (TI) and phytic acid (PA). On an oil-extracted basis the TI values ranged from 1.26 to 5.31 units gl. Values for B. napus ranked highest (3.58, 3.61) and B. juncea lowest ( 1.26, 1.39, 1.56) (P < 0.05). In a comparison of PA in three cultivars (B. napus, B. rapa, B. juncea), the cultivars differed in PA contents (2.52, 2.94, 2.70, respectively), there were no year-to-year differen ces over 4 yr (2.56, 2.67, 2.68 vs. 2.96) but there were significant l ocation effects (2.12, 2.21 vs. 3.04, 3.42). In a set of 10 cultivars replicated three times, B. juncea PA contents (3.35-3.91) exceeded tho se of B. napus (2.92, 3.06), and B. carinata (2.72, 3.15). Sinapis alb a had the lowest value (2.49). Bronowski (B. napus), the gene source o f all low glucosinolate cultivars, contained the most TI (5.31 units g (-1)) and the least PA(1.93%).