Abstract
In the previous communication the authors reported that when aqueous solution of L-ascorbic acid was placed in a sonic field, the indophenol titration value was decreased as a function of sonication times
In this report the effect of sonic oscillation on vitamin C and B1 content of vegetable tissues was observed and following results were obtained:
1) In the aqueous solution of thiamine derivatives such as B1 -HCl, B1 -NDS, DBT and B1 -pyrophosphate, the thiochrome estimation value was decreased by sonic treatment, respectively.
2) Coexistence of SH compound, such as cysteine, seems to prevent ascorbic acid and thiamine from the effect of sonication.
3) Almost no effect was observed on the ascorbic acid content of fresh parsley leaves, or on the thiamine content of soybean tissue and rice bran tissue by sonic oscillation.
4) When thiamine was added to clam organ extract which was previously sonicated, the percent recovery of thiamine added was 75.7% for 60 minutes sonication.
