Radioprotective efficacy of HT + AET in encapsulated form.

Entrapment of 5-hydroxyl-L-tryptophan (HT) in erythrocyte ghost prepared by hypotonic method and high voltage electric discharge method are nearly same. Release of HT with beta-aminoethylisothiuronium bromide hydrobromide (HT + AET) in in vitro system is rapid but only a portion of the entrapped amount is released. Release of HT + AET in serum marginally increases at 2 hr. Compared to release in in vitro medium the release in serum is less. Survival studies with Swiss albino mice indicates that compared to HT alone, the combination of HT + AET shows about 9 times percentage survival. The same combination in the encapsulated form show comparable percentage survival though the amount needed is 1/200th times compared to free form.