International Journal of Advance Agricultural Research
ISSN: 2053-1265
Vol. 5(2), pp. 29-39, February 2017



Physicochemical properties of refined and unrefined oils of gingerbread plum (Neocarya macrophylla) kernels from Guinea and Niger

Mohamed Diaby1, Tidjani Amza2, Gbago Onivogui1, Khamis Ali Omar1, Xiao Qiang Zou1 and Qing Zhe Jin1*

1State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue Wuxi, 214122, Jiangsu Province, PR China.
2Faculté d’Agronomie et des Sciences de l’Environnement, Université de Tillabéri, BP 175, Tillabéri, Niger.

*To whom correspondence should be addressed. E-mail: diaby.mohamed11@yahoo.com; jqzwuxi@163.com.

Received 24 December, 2016; Received in revised form 30 January, 2017; Accepted 02 February, 2017.

Abstract


Keywords:
Gingerbread plum kernel, Unsaturated fatty acids, Physicochemical properties.


In this study, gingerbread plum kernel oil from Guinea (GPKOG) and Niger (GPKON) were refined (R-GPKOG and R-GPKON), studied and compared for their fatty acid compositions, phytosterols contents and distribution of volatile compounds. Solid-phase micro-extraction (SPME), in combination with gas chromatography/mass spectrometry (GC/MS), were used to study volatile compounds. Thermal stability was evaluated in situ by differential scanning calorimetry (DSC). The results obtained show that both refined (R-GPKOG and R-GPKON) and unrefined (GPKOG and GPKON) oils contained high levels of oleic acids (46.36%; 45.89% and 40.18%; 42.46%, respectively), while linoleic and arachidonic acid constituted the major polyunsaturated fatty acids. Among the 11 sterol compounds found in this study, 24-hydroxy-24-methyl cholesterol, clerosterol and sitosterol in GPKON, R-GPKON, GPKOG and R-GPKOG accounted for 68.3, 38.94, 66.33 and 37.71%, respectively. Among the volatile and semi-volatile compounds; Octanal level was the highest in all samples (40-55%) followed by 2, 4-trans, trans-Nonadienal and Hexanal.

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