Data/hora: 10/06/2024 00:41:41

Provedor de dados: | 64
País: | Brazil
Título: | Correlation between antioxidant activity and coffee beverage quality by Electron Spin Resonance Spectroscopic
Autores: | Barbosa,Jeam Haroldo Oliveira; Luna,Jorge Antonio Gómez; Kinoshita,Angela Mitie Otta; Baffa Filho,Oswaldo.
Data: | 2013-12-01
Ano: | 2013
Palavras-chave: | Classify; Method; IC50.
Resumo: | Brazil is the largest producer of coffee in the world and coffee prices are directly linked to grain quality. In this work, the antioxidant activity of coffee was related to its quality through Electron Spin Resonance Spectroscopy (ESR), as an attempt to establish a non-subjective method to classify the grain quality. For that purpose, the IC50 and temporal monitoring of its non-oxidized fraction were determined for three bean qualities: Soft (High), Hard (Medium) and Rio (Low). Methanolic solution of 2,2-difenil-1-picril-hidrazila (DPPH), that has a stable radical and a JEOL FA-200 (X-Band) spectrometer were used for these tests. The temporal monitoring of reaction between radical and coffee was performed. The rate of reduced or of antioxidated radicals was determined on time and for each coffee beverage quality were found different slopes of curve: Soft (0.32±0.02), Hard (0.47±0.02) and Rio (0.60±0.02). The IC50 result of Rio quality (2.7 ± 0.9) was different from the Soft (7.8 ± 1.9) and Hard (6.5 ± 1.5) values, but there was no difference between the High and Medium results due to the uncertainty associated. Therefore the results found, mainly for monitoring temporal, establish a new quantitative methodology for classifying the coffee beverage quality.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000600002
Editor: | Editora da Universidade Federal de Lavras
Relação: | 10.1590/S1413-70542013000600002
Formato: | text/html
Fonte: | Ciência e Agrotecnologia  v.37 n.6 2013
Fonte: | info:eu-repo/semantics/openAccess