Oxidative Stability of Baru (Dipteryx alataVogel) Oil Monitored by Fluorescence and Absorption Spectroscopy

Vanessa D Silva,Omar P S Filho,Ivan P Oliveira,José N Conceição,Gleison A Casagrande,Rozanna M Muzzi,Edemilson C Conceição,Caroline H Lescano,Anderson R L Caires

doi:10.1155/2015/803705

Abstract

Baru (Dipteryx alataVogel) is a native fruit of the Brazilian savanna that provides a nutritive oil, which also has medicinal properties. Baru fruits were collected in central-western Brazil, and the oil was obtained by pressing the seeds. The Baru oil was heated at 110°C for 24 h, and its oxidative stability was investigated by using fluorescence and absorption spectroscopy. The data showed that both absorption and fluorescence were able to precisely monitor the oil degradation induced by the thermooxidative process. The results revealed a rapid growth of the primary compounds generation in the first 16 hours of degradation. Significant amounts of secondary compounds began to be generated after 14 hours.

Highlights

Baru (Dipteryx alata Vogel), known as cumbaru, cumaru, barujo, coco-feijao, cumarurana, emburena-brava, feijaococo, and pau-cumaru [1], is a native tree of the Brazilian savanna
Chlorophylls as well as carotenoids may be absorbed in the 350–550 range [17]; in analyzing the diluted sample, our data revealed that carotenoids are the main compounds responsible for the observed absorption between 350 and 550 nm, as demonstrated in Figure 2 where β-carotene absorption spectrum is shown
We investigated the thermal stability of Baru oil by analyzing the optical features of the samples

Summary

Introduction

Baru (Dipteryx alata Vogel), known as cumbaru, cumaru, barujo, coco-feijao, cumarurana, emburena-brava, feijaococo, and pau-cumaru [1], is a native tree of the Brazilian savanna. Takemoto and collaborators found that Baru seed oil is highly unsaturated due to the predominance of oleic and linoleic acids and its α-tocopherol content [3, 5]. Based on these chemical properties, Baru oil can be used for food, and in the cosmetics and oleochemical industries. By analyzing the peroxide number, iodine number, kinematic viscosity, water content, relative density, saponification number, and refractive index, confirmed the high quality of Baru oil for use as a raw material for biodiesel production [6]

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Conclusion