Estudo comparativo entre metodo pratico de campo e metodos laboratoriais na determinacao de amido em mandioca

By:

JUSTE JUNIOR, E.S.G

Contributor(s):

Material type: Article

ArticleLanguage: Portuguese Description: p. 142-147Subject(s): LOC classification:

16697

In: In: Empresa de Pesquisa Agropecuária de Minas Gerais. Projeto Mandioca: Relatório 76/79Summary: Optimum harvest time was determined in a completely randomized exptl. design with 5 replicates and 3 treatments based on starch content of studied cv. and sugar and starch contents of the peel and pulp of cassava roots. Treatments were harvest times (11, 14, 17, and 20 mo. after planting), cv. (Mantiqueira, Branca de Santa Catarina, and Riqueza), and methods of determining sugar and starch contents (physical with the hydrostatic balance and chemical by hydrolisis and titration according to Fehling, and colorimetry). Differences in the methods of determining starch content were not significant, variations depending on harvest time and cv. Starch contents of the peel of all cv. were lower than those of the pulp. Considering that the min. level of starch required by alcohol industries is 30 percent, the following harvest times are recommended for the different cv.: Branca de Santa Catarina, 14-20 mo. (peeled roots) and 11-20 mo. (pulp); Riqueza, 17-20 mo. (peeled roots) and 14-20 mo. (pulp); and Mantiqueira, 14-20 mo. (peeled roots or pulp). When the total sugar content was added to starch content, Branca de Santa Catarina and Riqueza had hexose contentshigher than 30 percent between 11-20 mo. This favors their period of use. (CIAT)

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Holdings
Item type	Current library	Collection	Call number	Copy number	Status	Date due	Barcode	Item holds
Book Chapters	CIAT Library Document collection CINFOS	Document Collection CINFOS	16697 (Browse shelf(Opens below))	c.1	Short Loan		100063952

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Optimum harvest time was determined in a completely randomized exptl. design with 5 replicates and 3 treatments based on starch content of studied cv. and sugar and starch contents of the peel and pulp of cassava roots. Treatments were harvest times (11, 14, 17, and 20 mo. after planting), cv. (Mantiqueira, Branca de Santa Catarina, and Riqueza), and methods of determining sugar and starch contents (physical with the hydrostatic balance and chemical by hydrolisis and titration according to Fehling, and colorimetry). Differences in the methods of determining starch content were not significant, variations depending on harvest time and cv. Starch contents of the peel of all cv. were lower than those of the pulp. Considering that the min. level of starch required by alcohol industries is 30 percent, the following harvest times are recommended for the different cv.: Branca de Santa Catarina, 14-20 mo. (peeled roots) and 11-20 mo. (pulp); Riqueza, 17-20 mo. (peeled roots) and 14-20 mo. (pulp); and Mantiqueira, 14-20 mo. (peeled roots or pulp). When the total sugar content was added to starch content, Branca de Santa Catarina and Riqueza had hexose contentshigher than 30 percent between 11-20 mo. This favors their period of use. (CIAT) eng