ANALYSIS OF OIL CONTENT AND OIL QUALITY IN OILSEEDS BY LOW-FIELD NMR

作者：Constantino Andre F^*; Lacerda Valdemar Jr; dos Santos Reginaldo B; Greco Sandro J; Silva Renzo C; Neto Alvaro C; Barbosa Lucio L; de Castro Eustaquio V R; Freitas Jair C C

来源：Quimica Nova, 2014, 37(1): 10-17.

• low-field NMR
• biodiesel
• oleaginous plants

To choose among the variety of oleaginous plants for biodiesel production, the oil content of several matrices was determined through different low-field H-1 nuclear magnetic resonance (NMR) experiments with varied pulse sequences, namely single-pulse, spin-echo, CPMG, and CWFP. The experiments that involved the first three sequences showed high correlation with each other and with the solvent extraction method. The quality of the vegetable oils was also evaluated on the basis of the existing correlation between the T-2 values of the oils and their properties, such as viscosity, iodine index, and cetane index. These analyses were performed using HCA and PCA chemometric tools. The results were sufficiently significant to allow separation of the oleaginous matrices according to their quality. Thus, the low-field H-1 NMR technique was confirmed as an important tool to aid in the selection of oleaginous matrices for biodiesel production.

• 出版日期2014