Abstract
The effect of microwave pretreatment of catfish processing waste on oil recovery and quality was investigated. Fish oil was extracted using the enzymatic hydrolysis using alcalase enzyme after the microwave pretreatment. The effect of microwave power and microwave pretreatment times was evaluated. The results revealed that a highest yield of 9.25% when catfish waste was treated at 110 W for 60 s. This condition was found as the most appropriate condition of microwave pretreatment since it decreased the extraction time from 150 min to up to 30 min. Analysis of oil quality indices (e.g. acid value, p -anisidine value, peroxide value) extracted by microwave pretreatment and non-pretreatment indicated that catfish oil from both processes has comparatively similar fatty acids composition. In addition, catfish oil was extracted by microwave pretreatment and enzymatic hydrolysis had lower lipid oxidation compared to several standards.
Highlights
[5,] supercritical fluid extraction [6], soxhlet method [7], wet and steam rendering methods [8] and wet pressing method [9]
The effect of microwave pretreatment on oil extraction yield by enzymatic hydrolysis was carried out using fish processing waste with microwave pretreatment and nonpretreatment or untreated samples
It was found that the oil extraction yield was increased significantly when microwave pretreatment times was increased from 0 to 60 s
Summary
[5,] supercritical fluid extraction [6], soxhlet method [7], wet and steam rendering methods [8] and wet pressing method [9]. Microwave heating is preferred over conduction/convection heating as it heats the target object directly by applying an electromagnetic field to dielectric molecules This technique can help to hydrolyse the enzymatic hydrolysis process. Among available and currently being-developed methods, microwave pretreatment is a method of choice because it is a simple technique for production of high quality oil as well as provision of highly nutritional values retention. As far as it can be ascertained, there have been no published reports on the effects of microwave pretreatment on extraction yield and quality of catfish oil extracted from catfish processing waste in Northern Thailand. This study aims to investigate the effect of microwave pretreatment on the catfish oil extraction operation by enzymatic hydrolysis and evaluate the fish oil quality
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