DETERMINATION OF Cu, Fe, Mn, Zn AND FREE FATTY ACIDS IN PEQUI OIL

Química Nova

Marques, Rafael¹  Oliveira, Marcone A. L. de¹  Universidade Federal de Juiz de Fora, Juiz de Fora, Brazil¹  Le Hyaric, Mireille¹  Silva, Julio C. J.¹  Mimura, Aparecida M. S.¹  Faza, Lara P.¹ 

关键词:  pequi oil;    trace-elements;    free fatty acids;    F AAS;    CZE;   

DOI  :  10.5935/0100-4042.20160067

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Pequi (Caryocar brasiliense Camb.), a typical fruit of the Brazilian Cerrado, is an important source of micronutrients and fatty acids. In this work, a new approach for the acid digestion (using H2SO4, HNO3 and H2O2) of pequi oil samples and the determination of Cu, Fe, Zn and Mn by flame atomic absorption spectrometry (F AAS) was employed. Capillary zone electrophoresis (CZE) was used for free fatty acid (FFA) determination after simple and fast extraction with heated ethanol. Good results regarding precision (RSD < 10%, in most cases), sensitivity and adequate LOD and LOQ values were obtained. The accuracy was evaluated using spike tests and the recoveries were from 97 to 107%. The analytes were investigated in four different pequi oil samples. Fe was the trace element with the highest concentration (from 1.99 to 10.3 mg/100 g), followed by Zn, Mn and Cu (1.15 to 3.19, 0.42 to 0.91 and 0.31 to 0.56 mg/100 g, respectively). The main FFA found were oleic acid and palmitic acid (1.61 to 10.7 and 0.82 to 2.69 g/100 g, respectively), while linoleic acid (0.50 g/100 g) was detected in only one sample. The pequi oil chemical composition showed good characteristics to be used as a food additive, in cosmetic formulations and for traditional medicine.

【 授权许可】

Unknown