Total alcoholic acidity and pH tests as quality parameters in stored soybean grains
ABSTRACT Despite the technology available to agriculture, qualitative and quantitative losses occurring during post-harvest are still not controlled, and stored grains may undergo changes in their composition, due to storage conditions. This study aimed at determining the sensitivity of the alcoholi...
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Published in: | Pesquisa agropecuária tropical Vol. 46; no. 2; pp. 191 - 196 |
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Goiânia
Universidade Federal de Goiás - Escola de Agronomia e Engenharia de Alimentos
01-06-2016
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Abstract | ABSTRACT Despite the technology available to agriculture, qualitative and quantitative losses occurring during post-harvest are still not controlled, and stored grains may undergo changes in their composition, due to storage conditions. This study aimed at determining the sensitivity of the alcoholic acidity and pH tests in soybean (GB 874RR cultivar) grains with different quality standards obtained during storage. A completely randomized design, in a 3 x 6 x 5 (3 storage conditions x 6 storage times x 5 methods) factorial scheme, was used. A correlation was observed among pH, total acidity content (r = 0.888) and grain quality parameters. Deterioration was identified based on the total acidity content, showing a high correlation with fungal incidence (r = 0.864), ether extract (r = -0.781) and electrical conductivity (r = 0.923). The use of phenolphthalein as indicator is more sensitive than pH 8.8. Among the pH determination methods, AOAC was the most suitable for assessing the quality loss during storage.
RESUMO Apesar da tecnologia disponível à agricultura, as perdas qualitativas e quantitativas, originadas durante a pós-colheita, ainda não são controladas, e os grãos armazenados podem sofrer alterações em sua composição, em razão da condição de estocagem. Objetivou-se verificar a sensibilidade do teste de teor de acidez alcoólico e pH, em grãos de soja (cultivar GB 874RR) com diferentes padrões de qualidade obtidos durante o armazenamento. Utilizou-se delineamento inteiramente casualizado, em esquema fatorial 3 x 6 x 5 (3 condições de armazenamento x 6 tempos de armazenamento x 5 métodos). Observou-se correlação entre o pH, teor de acidez total (r = 0,888) e parâmetros de qualidade dos grãos. Identificou-se processo deteriorativo a partir do teor de acidez total, apresentando alta correlação com incidência fúngica (r = 0,864), extrato etéreo (r = -0,781) e condutividade elétrica (r = 0,923). A utilização de fenolftaleína como indicador é mais sensível que a do pH 8,8. Dentre os métodos de determinação de pH, o da AOAC demonstrou ser mais adequado para avaliação da perda de qualidade ao longo do armazenamento. |
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AbstractList | Despite the technology available to agriculture, qualitative and quantitative losses occurring during post-harvest are still not controlled, and stored grains may undergo changes in their composition, due to storage conditions. This study aimed at determining the sensitivity of the alcoholic acidity and pH tests in soybean (GB 874RR cultivar) grains with different quality standards obtained during storage. A completely randomized design, in a 3 x 6 x 5 (3 storage conditions x 6 storage times x 5 methods) factorial scheme, was used. A correlation was observed among pH, total acidity content (r = 0.888) and grain quality parameters. Deterioration was identified based on the total acidity content, showing a high correlation with fungal incidence (r = 0.864), ether extract (r = -0.781) and electrical conductivity (r = 0.923). The use of phenolphthalein as indicator is more sensitive than pH 8.8. Among the pH determination methods, AOAC was the most suitable for assessing the quality loss during storage. ABSTRACT Despite the technology available to agriculture, qualitative and quantitative losses occurring during post-harvest are still not controlled, and stored grains may undergo changes in their composition, due to storage conditions. This study aimed at determining the sensitivity of the alcoholic acidity and pH tests in soybean (GB 874RR cultivar) grains with different quality standards obtained during storage. A completely randomized design, in a 3 x 6 x 5 (3 storage conditions x 6 storage times x 5 methods) factorial scheme, was used. A correlation was observed among pH, total acidity content (r = 0.888) and grain quality parameters. Deterioration was identified based on the total acidity content, showing a high correlation with fungal incidence (r = 0.864), ether extract (r = -0.781) and electrical conductivity (r = 0.923). The use of phenolphthalein as indicator is more sensitive than pH 8.8. Among the pH determination methods, AOAC was the most suitable for assessing the quality loss during storage. ABSTRACT Despite the technology available to agriculture, qualitative and quantitative losses occurring during post-harvest are still not controlled, and stored grains may undergo changes in their composition, due to storage conditions. This study aimed at determining the sensitivity of the alcoholic acidity and pH tests in soybean (GB 874RR cultivar) grains with different quality standards obtained during storage. A completely randomized design, in a 3 x 6 x 5 (3 storage conditions x 6 storage times x 5 methods) factorial scheme, was used. A correlation was observed among pH, total acidity content (r = 0.888) and grain quality parameters. Deterioration was identified based on the total acidity content, showing a high correlation with fungal incidence (r = 0.864), ether extract (r = -0.781) and electrical conductivity (r = 0.923). The use of phenolphthalein as indicator is more sensitive than pH 8.8. Among the pH determination methods, AOAC was the most suitable for assessing the quality loss during storage. RESUMO Apesar da tecnologia disponível à agricultura, as perdas qualitativas e quantitativas, originadas durante a pós-colheita, ainda não são controladas, e os grãos armazenados podem sofrer alterações em sua composição, em razão da condição de estocagem. Objetivou-se verificar a sensibilidade do teste de teor de acidez alcoólico e pH, em grãos de soja (cultivar GB 874RR) com diferentes padrões de qualidade obtidos durante o armazenamento. Utilizou-se delineamento inteiramente casualizado, em esquema fatorial 3 x 6 x 5 (3 condições de armazenamento x 6 tempos de armazenamento x 5 métodos). Observou-se correlação entre o pH, teor de acidez total (r = 0,888) e parâmetros de qualidade dos grãos. Identificou-se processo deteriorativo a partir do teor de acidez total, apresentando alta correlação com incidência fúngica (r = 0,864), extrato etéreo (r = -0,781) e condutividade elétrica (r = 0,923). A utilização de fenolftaleína como indicador é mais sensível que a do pH 8,8. Dentre os métodos de determinação de pH, o da AOAC demonstrou ser mais adequado para avaliação da perda de qualidade ao longo do armazenamento. |
Author | Caneppele, Maria Aparecida Braga Bianchini, Maria das Graças Assis Araujo, Maicon Marinho Vieira |
AuthorAffiliation | Universidade Federal de Mato Grosso |
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Author_xml | – sequence: 1 givenname: Maicon Marinho Vieira surname: Araujo fullname: Araujo, Maicon Marinho Vieira organization: Universidade Federal de Mato Grosso, Brazil – sequence: 2 givenname: Maria Aparecida Braga surname: Caneppele fullname: Caneppele, Maria Aparecida Braga organization: Universidade Federal de Mato Grosso, Brazil – sequence: 3 givenname: Maria das Graças Assis surname: Bianchini fullname: Bianchini, Maria das Graças Assis organization: Universidade Federal de Mato Grosso, Brazil |
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Keywords | fatty acid ácido graxo Glycine max L storage conditions condições de armazenamento |
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I. – volume: 28 start-page: 473 issue: 6 year: 2004 end-page: 488 article-title: Storage conditions affect soybean color, chemical composition and tofu qualities publication-title: Journal of Food Processing and Preservation – volume: 15 start-page: 300 issue: 4 year: 2012 end-page: 306 article-title: Caracterização físico-química e tecnológica da farinha de soja integral fermentada com Aspergillus oryzae publication-title: Food Technology – volume: 61 start-page: 364 issue: 4 year: 1984 end-page: 367 article-title: Biological availability of nutrients in processed foods publication-title: Journal of Chemical Education – volume: 29 start-page: 593 issue: 3 year: 2006 end-page: 599 article-title: Titulação potenciométrica aplicada na determinação de ácidos graxos livres de óleos e gorduras comestíveis publication-title: Química Nova – year: 1977 publication-title: Seed pathology contributor: fullname: NEERGAARD, P. – volume: 25 start-page: 77 issue: 2 year: 2003 end-page: 81 article-title: Controle da germinação de sementes de soja em testes de sanidade pelo uso da restrição hídrica publication-title: Revista Brasileira de Sementes – volume: 23 start-page: 201 issue: 2 year: 2005 end-page: 220 article-title: Revisão: efeito do tratamento sob alta pressão sobre as propriedades funcionais da proteína de soja e interação proteína-polissacarídeos publication-title: Boletim do Centro de Pesquisa de Processamento de Alimentos – year: 2009 publication-title: Boas práticas e sistema APPCC na fase de pós-colheita de milho contributor: fullname: QUEIROZ, V. A. V. – year: 2004 publication-title: Química de alimentos: teoria e prática contributor: fullname: ARAÚJO, J. M. A. – year: 2008 publication-title: Métodos físico-químicos para análise de alimentos – start-page: 777 year: 1995 end-page: 801 publication-title: Methods of analysis of AOAC International contributor: fullname: LANE, R. H. – volume: 24 start-page: 413 issue: 3 year: 2004 end-page: 418 article-title: Determining economical TBHQ doses for corn oil stability publication-title: Ciência e Tecnologia de Alimentos – year: 1999 publication-title: Vigor de sementes: conceitos e testes contributor: fullname: KRZYZANOWSKI, F. C.; VIEIRA, R. D.; FRANÇA NETO, J. B. – year: 2001 publication-title: Análise química para avaliação de fertilidade de solos tropicais contributor: fullname: VAN RAIJ, B. – year: 1997 publication-title: Soybeans: chemistry, technology and utilization contributor: fullname: LIU, K. – volume: 40 start-page: 2483 issue: 12 year: 1992 end-page: 2487 article-title: Protein insolubilization and thermal destabilization during storage as related to hard-to-cook defect in cowpeas publication-title: Journal of Agricultural and Food Chemistry |
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Snippet | ABSTRACT Despite the technology available to agriculture, qualitative and quantitative losses occurring during post-harvest are still not controlled, and... Despite the technology available to agriculture, qualitative and quantitative losses occurring during post-harvest are still not controlled, and stored grains... |
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SubjectTerms | AGRICULTURE, MULTIDISCIPLINARY AGRONOMY fatty acid Glycine max L storage conditions |
Title | Total alcoholic acidity and pH tests as quality parameters in stored soybean grains |
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