Hydrocyanic acid content evaluation of cassava (Manihot esculenta Crantz) varieties
Date
7-2015
Degree
Bachelor of Science in Agriculture
Major Course
Major in Agronomy
College
College of Agriculture and Food Science (CAFS)
Adviser/Committee Chair
Antonio G. Lalusin
Abstract
Cassava is considered as a valuable food crop given its high carbohydrate content however presence of the compounds linamarin and lotaustralin provides health risks as it releases hydrocyanic acid (HCN) upon hydrolysis. HCN is responsible for acute cyanide intoxication upon consumption of poorly processed cassava and may also cause goiter and other neurological disorders upon regular intake paired with low protein diet. Sodium picrate colorimetric reaction was used to assess the HCN content of 96 cassava varieties at different parts namely young leaf, old leaf, stem, cortex and the root flesh. The protocol set by Cagampang and Rodriguez (1980) in identifying HCN level was used. Six varieties were identified to be under the low HCN concentration (5-30 μg) at the root flesh part while majority of the varieties tested qualified for medium HCN concentration (31- 50 μg). Analysis of Variance under Randomized Complete Block Design shows highly significant variability at α=5% and 1% among the parts per variety observed. Highly significant association were observed between the old and young leaf, old leaf and stem, stem and young leaf, and cortex and stem though their association ranges only from weak to moderate association. Five groups were established under cluster analysis. Fifty six out of the 96 tested varieties were clustered together and is characterized by medium to high level HCN at the old and young leaf and cortex, medium level at the stem and low to high level HCN at the root flesh including five of the selected varieties with low HCN concentration at the flesh level. Twenty six varieties fall under the third class which is composed of varieties with medium HCN level at the old leaf and stem, medium to high level at the cortex and root flesh and high HCN level at the young leaves
Language
English
Location
UPLB Main Library Special Collections Section (USCS)
Call Number
G 993.5 2015 A3 F56
Recommended Citation
Flores, Gizel Enimedez, "Hydrocyanic acid content evaluation of cassava (Manihot esculenta Crantz) varieties" (2015). Undergraduate Theses. 1593.
https://www.ukdr.uplb.edu.ph/etd-undergrad/1593
Document Type
Thesis