Análise de acidez graxa como índice de qualidade em grãos de soja
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Data
2003-09
Autores
Soares, Tatiane Aparecida [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
A soja [Glycine max (L.) Merrill], devido às suas características morfológicas e fisiológicas, é muito propensa à deterioração e sensível a práticas inadequadas de manejo durante a colheita e processamento, denotando um baixo poder de armazenamento. O presente trabalho, conduzido no Laboratório de Processamento de Produtos Agrícolas – UNESP, Botucatu/SP e no Centro Nacional de Pesquisa de Soja – Embrapa Soja, Londrina/PR teve como objetivo o estudo de um índice de qualidade sensível à deterioração, com metodologia simples, rápida e de boa aplicabilidade para grãos de soja. A análise de qualidade pelo método da acidez graxa foi avaliada pela variação do nível de ácidos graxos livres em grãos de soja provenientes de lotes com diferentes danificações, tendo como referência o teste de tetrazólio (vigor e viabilidade) e a classificação comercial para exportação (porcentagem de grãos ardidos), respectivamente. O comportamento do índice de acidez graxa segundo diferentes fontes de deterioração, ao longo de um período de armazenamento, também foi testado. Assim, grãos de soja da safra 2001/2002, colhidos na Fazenda Lageado (FCA/UNESP-Botucatu), foram submetidos a condições, desde a colheita até o armazenamento, que predispusessem o desenvolvimento de dano mecânico, térmico e de microrganismos. Durante um período de 240 dias, foram realizadas as análises de acidez graxa, tendo como referência testes de qualidade já padronizados (teste de tetrazólio, teor de óleo, rancidez e nível de infecção, conforme o tratamento). Foi utilizada a análise de variância de um delineamento inteiramente ao acaso com os tratamentos no esquema fatorial. Foram utilizadas cinco repetições e, aplicado o teste de Tukey no nível de 5% de significância para comparação entre médias. O efeito dos momentos de avaliação foram... .
The soybean [Glycine max (L.) Merrill], due to its morphology caracteristics, is inclined to deterioration and sensible to inadequate practices of handling during the storage and the process. This work, conducted on Agricultural Products Processing Laboratory – UNESP, Botucatu/SP, and National Center of Soybean Ressearch, Embrapa Soja, Londrina/PR, had the objective to study the rate of a sensible quality for deterioration, in a simple methodology, fast and good application on grains of soybean. The quality analysis through the fatty acid method was valued by the free fatty acids standard variation in soybean grains originating from portions with different danifications, with reference on tetrazolium test (vigor and vaibility) and the comercial classification to exporting (hot grains percentage), respecive. The behavior of fatty acid rate according to different deterioration fountain, along a stock period, was also tested. In this way, soy grains from 2001/2002 harvest, picked on Lageado Farm (FCA/UNESP-Botucatu), was submited to conditions, since the harvest to the to the stocking, that favourable the mechanic, thermal and from microorganisms damage development. During a 240 days period, was realized the fatty acid analysis, with references on standard quality tests (tetrazolium test, oil tenor, rancid and the infection rate, according the treatment). It was used na analysis of outline variance at random to the factor scheme treatment. It was repeated five times and applied the Tukey test on the significance of 5% rate to comparison between averages. The valuation moments effects was noticed through the regressive simple linear, that in proper to the variable didn’t show significative differences (P > 0.05), among the deterioration fountain. The results for the fatty acid method sensibility in front of different causes from deterioration showed... (Complete abstract, click electronic address below).
The soybean [Glycine max (L.) Merrill], due to its morphology caracteristics, is inclined to deterioration and sensible to inadequate practices of handling during the storage and the process. This work, conducted on Agricultural Products Processing Laboratory – UNESP, Botucatu/SP, and National Center of Soybean Ressearch, Embrapa Soja, Londrina/PR, had the objective to study the rate of a sensible quality for deterioration, in a simple methodology, fast and good application on grains of soybean. The quality analysis through the fatty acid method was valued by the free fatty acids standard variation in soybean grains originating from portions with different danifications, with reference on tetrazolium test (vigor and vaibility) and the comercial classification to exporting (hot grains percentage), respecive. The behavior of fatty acid rate according to different deterioration fountain, along a stock period, was also tested. In this way, soy grains from 2001/2002 harvest, picked on Lageado Farm (FCA/UNESP-Botucatu), was submited to conditions, since the harvest to the to the stocking, that favourable the mechanic, thermal and from microorganisms damage development. During a 240 days period, was realized the fatty acid analysis, with references on standard quality tests (tetrazolium test, oil tenor, rancid and the infection rate, according the treatment). It was used na analysis of outline variance at random to the factor scheme treatment. It was repeated five times and applied the Tukey test on the significance of 5% rate to comparison between averages. The valuation moments effects was noticed through the regressive simple linear, that in proper to the variable didn’t show significative differences (P > 0.05), among the deterioration fountain. The results for the fatty acid method sensibility in front of different causes from deterioration showed... (Complete abstract, click electronic address below).
Descrição
Palavras-chave
Soja - Armazenamento, Soja - Acidez, Soja - Qualidade
Como citar
SOARES, Tatiane Aparecida. Análise de acidez graxa como índice de qualidade em grãos de soja. 2003. vi, 74 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agronômicas, 2003.