Optimization of microwave drying assisted screw press conditions for oil from salmon head and belly flap

Duong Van Luan * , & Kha Chan Tuyen

* Correspondence: Duong Van Luan (email: khachantuyen@hcmuaf.edu.vn)

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Received: 03 Jun 2018
Revised: 08 Jun 2018
Accepted: 13 Jun 2018
Published: 10 Oct 2018
DOI: 10.58810/vhujs.6.2.2018.6250
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How to Cite
Dương, L. . V., & Kha, T. C. (2018). Optimization of microwave drying assisted screw press conditions for oil from salmon head and belly flap. Van Hien University Journal of Science 6(2), 131-138.
Issue
Volume 6 - Issue 2 (2018)
Section
Công nghệ thực phẩm

Main Article Content

Abstract

In the salmon fillet processing industry, the amount of by-product is relatively high and is not used effectively. Salmon head and belly flap account for about 18% of by-products which have relatively high oil content (20%) and high nutritional value. Therefore, utilization of by-products for the processing of high quality of fish oil product is desirable. This study aimed to determine the most suitable processing conditions to enhance the yield and quality of the resultant salmon oil. This study investigated the effect of microwave power levels (495, 630 and 900 W) on the oil yield and quality. The results showed that salmon oil yield tended to increase and at the microwave powder of 900 W gave the high oil yield with good quality. Different moisture contents (15%, 20% and 25%) of the salmon head and belly flap prior to press was also investigated. The preliminary results indicated that the high oil yield was obtained when the moisture content was about 25%. The preliminary results also indicated that the rotation speed of the screw had a significant effect on the oil yield. The graphical optimization was adopted and it predicted the optimal press conditions including rotation speed of 9 rpm and moisture content of 22,5%. Under such conditions, the highest oil yield (84,2%) and good quality parameters including peroxide value (0,35 meqO2/kg), saponification value (188.1 mgKOH/g), acid value (3,5 mgKOH/g) and moisture content (0.89%) were predicted and confirmed.
Keywords: salmon oil, salmon, microwave drying, screw press

Article Details

References

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