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Changes in the carbohydrate constituents of cassava root‐tuber ( Manihot utilissima pohl) during growth
Author(s) -
Ketiku A. O.,
Oyenuga V. A.
Publication year - 1972
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740231209
Subject(s) - maltose , amylose , amylopectin , chemistry , starch , sucrose , xylose , hemicellulose , sugar , fructose , carbohydrate , lactose , food science , hydrolysate , manihot , cellulose , biochemistry , fermentation , hydrolysis
Sucrose formed the bulk of the sugars in cassava root‐tubers, accounting for more than 69% of the total sugars. Other sugars included fructose, glucose and maltose. Maltose was consistently present as the lowest amount. The highest concentration of sugars (5.7%) was attained nine months after planting. Starch accounted for the highest proportion of the carbohydrates. A peak value of 81% was observed eight months after planting. The decrease to 78% at nine months was accompanied by an increase in sugar concentration from 3.5% to 5.7%. The sum of cellulose and hemicellulose constituted the non‐available carbohydrate fraction to non‐ruminants. This was less than 7% of total carbohydrates. Paper chromatography of the neutralised hydrolysate of the extracted hemicellulose revealed the presence of glucose and xylose only. The amylose content of cassava starch varied between 16.2% and 17.4% during growth. This variation was significant at 1% F level. The separated amylose had an iodine affinity of 17.0% while amylopectin had 0.1%.