High-Performance Liquid Chromatographic Analysis of Amino Acids in Ackee Fruit with Emphasis on the Toxic Amino Acid Hypoglycin A
作者:K. D. Golden、O. J. Williams、Y. Bailey-Shaw
DOI:10.1093/chromsci/40.8.441
日期:2002.9.1
High-performance liquid chromatography is used to determine the amino acid content of ripe and unripe ackee fruit. Specific emphasis is placed on the level of the toxic amino acid hypoglycin A (hyp-A) in the unripe and ripe ackee fruit and seed. Unripe samples are found to contain significantly higher quantities (P < 0.05) of hyp-A when compared with ripe samples. Uncooked unripe fruit is found to contain 124.4 ± 6.7 mg/100 g fresh weight and uncooked ripe fruit 6.4 ± 1.1 mg/100 g fresh weight. The seed of the uncooked unripe fruit is found to contain 142.8 ± 8.8 mg/100 g fresh weight, and the seed of uncooked ripe fruit has 106.0 ± 5.4 mg/100 g fresh weight. Boiling fruit in water for approximately 30 min is efficient in removing hyp-A from the edible arilli; however, low levels of 0.54 ± 0.15 mg/200 mL are detected in the water that was used to cook the ripe fruit. The average %recovery of the amino acids was 80.34%.
Pyrimidine derivatives and related compounds. Part 50. Photochemical reaction of 5-substituted 6-azido-1,3-dimethyluracils with nucleophiles. Ring transformation of pyrimidine to 1,3,5-triazepine and hydantoin ring systems
studied. Irradiation of 5-alkyl-6-azidouracils (3) in the presence of amines caused a ring expansion to give 1,3,5-triazepine derivatives (7). Photolysis of 6-azido-1,3,5-trimethyluracil (3a) in alcohols gave the corresponding 6,6-dialkoxy-5-amino-5,6-dihydrouracils (8). When compound (3a) was irradiated in water, a ring contraction occurred to afford 3,5-dimethylhydantoin (9). On the other hand, 6-azido-5-cyano-1