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PHYSICOCHEMICAL AND RHEOLOGICAL CHARACTERIZATION OF AVOCADO OILS

Authors :
Tamara de Souza Jorge
Tiago Carregari Polachini
Liara Silva Dias
Neuza Jorge
Javier Telis-Romero
Source :
Ciência e Agrotecnologia, Vol 39, Iss 4, Pp 390-400 (2015)
Publication Year :
2015
Publisher :
Universidade Federal de Lavras, 2015.

Abstract

Avocado oil is rich in bioactive compounds, which can improve human health by acting as an antioxidant. It may be extracted from different varieties of avocado, such as Margarida and Hass varieties, each of them with particular characteristics. Aiming to evaluate the differences between them, avocado fruits and pulps from these were analyzed according to their physicochemical characteristics. After extracted, the oils had their bioactive characteristics studied and rheological behavior determined through a rotational rheometer. They were then compared to commercial avocado oil. The fruits of Margarida variety had greater size, higher weight (664.51 g), and higher pulp yield (72.19%) than Hass variety, which showed higher lipid content (65.29 g/100 g dry basis). The commercial oil showed less primary oxidative degradation, whereas Margarida variety had a lower level of secondary degradation products as well as a higher content of bioactive compounds, such as phytosterols (999.60 mg/kg) and tocopherols (36.73 mg/kg). The rheological behaviors of both oils were appropriately described through Newton model, with R2 > 0.999 for all temperatures. By an Arrhenius type equation, it was verified that Hass's rheological parameters are more influenced by temperature than Margarida and commercial oil, presenting activation energy of 33.6 kJ/mol.

Details

Language :
English, Spanish; Castilian, Portuguese
ISSN :
19811829 and 14137054
Volume :
39
Issue :
4
Database :
Directory of Open Access Journals
Journal :
Ciência e Agrotecnologia
Publication Type :
Academic Journal
Accession number :
edsdoj.0debb60fd12e4c6e8ca3f39282363e62
Document Type :
article
Full Text :
https://doi.org/10.1590/S1413-70542015000400010