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 | Acesso ao texto completo restrito à biblioteca da Embrapa Agroindústria de Alimentos. Para informações adicionais entre em contato com ctaa.biblioteca@embrapa.br. |
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Biblioteca(s): |
Embrapa Agroindústria de Alimentos. |
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Data corrente: |
31/12/2024 |
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Data da última atualização: |
28/01/2025 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
SOUZA, P. G. DE; SANTOS, A. C. C. dos; ORLANDO, E.; TRINDADE, M. E. F.; PALLONE, J.; AYRES, E. M. M.; ROSENTHAL, A.; TEODORO, A. J. |
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Afiliação: |
PÂMELA GOMES DE SOUZA, UNIVERSIDADE FEDERAL DO ESTADO DO RIO DE JANEIRO; AUGUSTO CÉSAR COSTA DOS SANTOS, UNIVERSIDADE ESTADUAL DE CAMPINAS; EDUARDO ORLANDO, UNIVERSIDADE ESTADUAL DE CAMPINAS; MARIA EDUARDA FLORES TRINDADE, UNIVERSIDADE FEDERAL DO ESTADO DO RIO DE JANEIRO; JULIANA PALLONE, UNIVERSIDADE ESTADUAL DE CAMPINAS; ELLEN M MENEZES AYRES, UNIVERSIDADE FEDERAL DO ESTADO DO RIO DE JANEIRO; AMAURI ROSENTHAL, CTAA; ANDERSON JUNGER TEODORO, UNIVERSIDADE FEDERAL FLUMINENSE. |
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Título: |
Comparison between methods of extraction and analysis of oxalic acid by flame atomic absorption spectrometry and uv-vis spectrophotometer in purslane leaves (Portulaca Oleracea L.). |
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Ano de publicação: |
2024 |
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Fonte/Imprenta: |
In: SIMPóSIO LATINO AMERICANO DE CIÊNCIA DE ALIMENTOS E NUTRIÇÃO, 15., 2023, Campinas. Anais eletrônicos..., Galoá, 2024. |
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Idioma: |
Inglês |
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Notas: |
SLACAN. Pôster 166099. |
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Conteúdo: |
Oxalic acid is an antinutrient that can complex with minerals such as calcium, reducing the bioaccessibility of this essential element, in addition to increasing the risk of generating oxalate crystals in the kidneys. Purslane (Portulaca oleracea L.), a Non-conventional edible plants (NCEP), has a high content of oxalic acid. Thus, this study aimed to compare two methods of extraction and analysis for the determination of oxalic acid in lyophilized purslane leaves. For extraction, two methods were used: the first, described by Adeneyi et al., (2009), where 6M HCl was used with heating for 1 hour (M1); and the second, described by Naiki et al., (2014), where 0.25N HCl was used, with heating for 15 min (M2). For both methods, an oxalate precipitation step was performed. The analyzes using the UV-vis spectrophotometer were performed using the KMnO4 oxidation method by oxalic acid, described by Naiki et al., (2014). For analysis by FAAS, the calcium concentration obtained was converted to that of oxalic acid, according to the formula described in the AOAC (1990), with adaptations. The results were expressed on a dry basis. In the spectrophotometer analyses, the leaves presented 27.5 ± 0.96 g/100g for M1 and 12.2 ± 1.1 g/100g for M2, showing a significant difference (p<0.05) between the results. In the FAAS analyses, the leaves presented 5.8 ± 0.5 g/100g for M1 and 6.1 g/100g for M2, with no significant difference (p<0.05) between the results. The very high levels found for the extraction using 6M HCl for 1 hour may have favored the extraction and precipitation of compounds that were not of interest, causing reactional interferences during the permanganate oxidation step. Extraction with more dilute acid contributes to Green Chemistry and FAAS analysis proved to be adequate for the determination of this antinutrient in purslane. MenosOxalic acid is an antinutrient that can complex with minerals such as calcium, reducing the bioaccessibility of this essential element, in addition to increasing the risk of generating oxalate crystals in the kidneys. Purslane (Portulaca oleracea L.), a Non-conventional edible plants (NCEP), has a high content of oxalic acid. Thus, this study aimed to compare two methods of extraction and analysis for the determination of oxalic acid in lyophilized purslane leaves. For extraction, two methods were used: the first, described by Adeneyi et al., (2009), where 6M HCl was used with heating for 1 hour (M1); and the second, described by Naiki et al., (2014), where 0.25N HCl was used, with heating for 15 min (M2). For both methods, an oxalate precipitation step was performed. The analyzes using the UV-vis spectrophotometer were performed using the KMnO4 oxidation method by oxalic acid, described by Naiki et al., (2014). For analysis by FAAS, the calcium concentration obtained was converted to that of oxalic acid, according to the formula described in the AOAC (1990), with adaptations. The results were expressed on a dry basis. In the spectrophotometer analyses, the leaves presented 27.5 ± 0.96 g/100g for M1 and 12.2 ± 1.1 g/100g for M2, showing a significant difference (p<0.05) between the results. In the FAAS analyses, the leaves presented 5.8 ± 0.5 g/100g for M1 and 6.1 g/100g for M2, with no significant difference (p<0.05) between the results. The very high levels found for the e... Mostrar Tudo |
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Palavras-Chave: |
Acid digestion; Química verde; Spectrometry. |
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Thesagro: |
Ácido Oxálico; Beldroega; Espectrofotometria; Extração; Tecnologia de Alimento. |
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Thesaurus Nal: |
Calcium oxalate; Extraction; Food technology; Spectrophotometers. |
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Categoria do assunto: |
Q Alimentos e Nutrição Humana |
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Marc: |
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Registro original: |
Embrapa Agroindústria de Alimentos (CTAA) |
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