The vitamin B1 content of potatoes

Abstract

By Schopfer''s method (growth of Phycomyces blakesleeanus) which is valid for determining vit. B1 in potato, this increased continuously during the growing season. The B1 content of potato leaves is very high, presumably being synthesized there and transferred to the growing tubers. The loss of B1 during winter and spring storage is apparently due to sprouting. An adjuvant factor for P. blakesleeanus is present in the skin layer and center of tubers between Apr. and Aug. In autumn the Majestic var. contains 140 [mu]g./100 g.; a daily ration of 12 oz. would therefore supply nearly half the normal human requirement.