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
Main Authors: Araujo, Maicon Marinho Vieira, Caneppele, Maria Aparecida Braga, Bianchini, Maria das Graças Assis
Format: Journal Article
Language:English
Published: Goiânia Universidade Federal de Goiás - Escola de Agronomia e Engenharia de Alimentos 01-06-2016
Escola de Agronomia/UFG
Universidade Federal de Goiás
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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.
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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  surname: Bianchini
  fullname: Bianchini, Maria das Graças Assis
  organization: Universidade Federal de Mato Grosso, Brazil
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CitedBy_id crossref_primary_10_1590_1678_4162_12396
crossref_primary_10_1007_s42853_023_00189_7
crossref_primary_10_1016_j_foodchem_2021_131476
Cites_doi 10.1021/jf00024a028
10.1590/S0101-20612004000300020
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10.1590/S0101-31222003000400011
10.1590/S1415-43662009000500014
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10.1590/S0100-40422006000300031
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10.1093/jee/97.4.1484
ContentType Journal Article
Copyright Copyright Universidade Federal de Goiás - Escola de Agronomia e Engenharia de Alimentos Apr-Jun 2016
This work is licensed under a Creative Commons Attribution 4.0 International License.
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Issue 2
Keywords fatty acid
ácido graxo
Glycine max L
storage conditions
condições de armazenamento
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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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