The cyanhydrin is hydrolysable to an acid, the lactone of which may be reduced by sodium amalgam to a glucoheptose, a non-fermentable sugar containing seven carbon atoms. By repeating the process a non-fermentable gluco-octose and a fermentable glucononose may be prepared.
Certain of these relations are here summarized (the starting substance is in italics): l-Glucose f- 1-arabinose --- l-mannose - l-mannoheptose; glucononose fa-gluco-octose F - a-glucoheptose f- d-glucose - 0-glucoheptose - > /-gluco-octose; d-mannose--> d-mannoheptose--> manno-octose--> mannononose; d-glucose --> d-arabinose - i d-erythrose.
While the fundamental constituent is a cellulose in many Mucorini and other Phycomycetes, in others bodies like pectose, callose, &c., commonly occur, and Wisselingh's researches show that chitin, a gluco-proteid common in animals, forms the main constituent in many cases, and is probably deposited directly as such, though, like the other substances, it may be mixed with cellulose.
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