Abstract
Regarding the storage rot of Unshu oranges, the writers made an investigation on sugar consumption in Unshu orange juice in which the three fungi; Aspergillus niger, Rhizopus nigricans, and Cephalothecium roseum were cultured respectively.
From the result of paper-chromatographic analy-sis the writers found sucrose, glucose, fructose, and xylose in the juice of Unshu oranges. Aspergillus developed well in juice utilizing at first sucrose and xylose. Rhizopus, however, seemed to utilize fructose at first, and then xylose. Sucrose was not consumed completely during the 20 days cultivation. Cephalothecium used at first sucrose.
Uronic acid, perhaps galacturoncic acid as a decomposition product of pectin, was found in juice after 3 or 10 days cultivation of the three fungi. This substance, however, could not be detected 20 days after the cultivation.
