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

Document Type

Thesis

This document is currently not available here.

Share

COinS