Malaysian Applied Biology Journal

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49_03_01

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Malays. Appl. Biol. (2020) 49(3): 1–9

 

CHARACTERIZATION OF HAZELNUT OIL EXTRACTED BY

ULTRASOUND ASSISTED SOLVENT EXTRACTION


CHIN HONG GEOW1, MEI CHING TAN1* and NYUK LING CHIN2


1Department of Chemical and Petroleum Engineering, Faculty of Engineering,

Technology and Built Environment, UCSI University, 56000 Cheras Kuala Lumpur, Malaysia

2Department of Process and Food Engineering, Faculty of Engineering, Universiti Putra Malaysia,

43000 UPM Serdang, Selangor Malaysia

*E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it


Accepted 8 September 2020, Published online 25 October 2020

 

ABSTRACT

In this study, ultrasound treatment was used to enhance the oil yield of hazelnut oil. The oil was extracted by using hexane with 15 min ultrasound treatment initially. Ultrasound amplitude (30, 60 and 90%), solvent to solid ratio (6:1, 8:1 and 10:1 mL/g) and extraction temperatures (28, 38 and 48°C) gave positive effect on oil yield. Higher oil yield of 88.78% was achieved at highest settings of ultrasound amplitude, solvent to solid ratio and temperature as compared to 69.57% obtained from the lowest settings of those parameters. Characterization of extracted oil in terms of iodine value, acid value, and peroxide value were carried out in this study. The results showed that ultrasound treatment would not significantly (p>0.10) affect those values. All the values obtained were in the range of acceptable levels for edible oil. In term of fatty acid, gas chromatograph analysis results showed that around 9% of saturated and 91% of unsaturated fatty acids were observed in hazelnut oil for all the amplitudes applied. More crack structures were observed on the surface of hazelnut samples after ultrasound treatment under scanning electron microscopy images, which could enhance the oil yield. This concluded that extraction with ultrasound aid could be used as an alternative extraction method for hazelnut oil with no negative impact on oil quality.

Key words: Ultrasound, hexane, solvent extraction, hazelnut oil

 

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Vol 49(3) October 2020

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