EFFECT OF PASTEURIZATION ON THE MICROBIAL, PHYSICOCHEMICAL AND SENSORY PROPERTIES OF WATERMELON JUICE

Noah, Abimbola A. and Lawal, A.O (2018) EFFECT OF PASTEURIZATION ON THE MICROBIAL, PHYSICOCHEMICAL AND SENSORY PROPERTIES OF WATERMELON JUICE. In: 1st International Conference and Exhibition on Technological Innovation and Global Competiveness, The Federal Polytechnic, Ilaro, November 5-8, 2018., November 5-8, 2018., The Federal Polytechnic, Ilaro.

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Abstract

Purpose:The effect of pasteurization on microbial, physicochemical and sensory properties of watermelon juice were evaluated from studies conducted on three samples of watermelon juice. Method: Samples evaluated are fresh watermelon juice (FWJ), watermelon juice pasteurized by high temperature short time (PHS) and watermelon juice pasteurized at low temperature long time (PLL). Results : Microbial analysis results from the investigation showed that highest total aserobic bacteria count of 9.8 x 106 cfu/ml yeast and mold 15.0x 105 cfu/ml Salmonella 2.0 x105 cfu/ml, Staphylococcus 9.1 x105 total coliform count of 29. 0x106 cfu/ml were recorded in FWJ. The bacteria isolated were Bacillus spp, Staphylococcus aureus ,Klebsiella spp and Pseudomonas spp while the mold isolates were Aspergillus niger and Rhizopus nigricans. The yeast isolated were Saccharomyces spp, Candida and Zygosaccharomyces spp. The physicochemical analysis shows that vitamin C content was higher in the fresh watermelon juice than the pasteurized watermelon juice while the pH and the tritable acidity are not affected. The sensory evaluation shows that fresh watermelon FWJ had the highest colour 7.20 and vitamin C 6.95mg/100g. However, PHS was rated high in flavour 87 and the overall acceptability tests revealed that sample PHS was preferred. Conclusion: Studies shows that high temperature short time is an effective method of inactivating microorganism and extending the shelf-life of products.

Item Type:	Conference or Workshop Item (Paper)
Subjects:	Q Science > Q Science (General) Q Science > QR Microbiology
Divisions:	Faculty of Engineering, Science and Mathematics > School of Chemistry
Depositing User:	Mr. Bolanle Yisau I.
Date Deposited:	11 Jun 2021 07:00
Last Modified:	11 Jun 2021 07:00
URI:	http://eprints.federalpolyilaro.edu.ng/id/eprint/1732

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