Measuring thermal properties of oilseeds using time domain nuclear magnetic resonance spectroscopy

Autor(es)

Carosio, Maria G. A. ^[1] ; Bernardes, Diego F. ^[2] ; Andrade, Fabiana D. ^[3] ; Moraes, Tiago B. ^[3] ; Tosin, Giancarlo ^[2] ; Colnago, Luiz A. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim Sao Carlos, Sao Carlos, SP - Brazil

^[2] Fine Instrument Technol, Sao Carlos, SP - Brazil

^[3] Univ Sao Paulo, Inst Fis Sao Carlos, Sao Carlos, SP - Brazil

^[4] EMBRAPA Instrumentacao, Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Food Engineering; v. 173, p. 143-149, MAR 2016.
• Citações Web of Science: 5

Resumo

A time domain nuclear magnetic resonance (TD-NMR) method to measure temperature and thermal diffusivity of intact oilseeds is demonstrated. The method to measure temperature of intact seeds is based in a calibration curve between the transverse relaxation time (T-2) of vegetable oil in the seed, with temperature. The thermal diffusivity (lambda) was calculating using the time constant of temperature decay, when the spherical sample was placed in a low temperature bath and its radius. The proof of principle was demonstrated with spherical samples of glycerol and ethylene glycol with known lambda. Thermal diffusivity of the macadamia nuts calculated by this method were approximately 0.9 x 10(-7) m(2) s(-1), similar to these values measured by thermocouple method (0.6 x 10(-7) m(2) s(-1)), Dickerson method (0.8 x 10(-7) m(2) s(-1)) and the lambda reported in literature for nuts and oilseeds. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 11/14099-3 - Uso de RMN no domínio do tempo para caracterização de sistemas orgânicos de alta viscosidade
• Beneficiário: Fabiana Diuk de Andrade
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/20247-8 - Desenvolvimento e validação de espectrômetros e métodos de RMN no domínio do tempo para análise não-destrutiva de alimentos
• Beneficiário: Luiz Alberto Colnago
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 09/09734-1 - Metodologia de medida da temperatura em sementes intactas em solos por RMN
• Beneficiário: Maria Gabriela Aparecida Carosio
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto