Research article
Vol 17 No 1 (2023): Volume 17, Number 1, 2023
Skim coconut milk processing by thermal- and ultrasonic-thermal pasteurization
Department of Chemical Engineering, Faculty of Engineering, University of Surabaya Jl Raya Kalirungkut, 55281 Surabaya, Indonesia
Department of Chemical Engineering, Faculty of Engineering, University of Surabaya Jl Raya Kalirungkut, 55281 Surabaya, Indonesia
Department of Chemical Engineering, Faculty of Engineering, University of Surabaya Jl Raya Kalirungkut, 55281 Surabaya, Indonesia
Department of Chemical Engineering, Faculty of Engineering, University of Surabaya Jl Raya Kalirungkut, 55281 Surabaya, Indonesia
Abstract
The coconut industry in Indonesia is significant for national income, with the potential for value-added products that could enhance the industry’s expansion. Skim coconut milk, a by-product of virgin coconut oil production, is a healthy substitute for dairy milk that can be consumed by people with lactose intolerance. The low-fat and high-protein content of skim coconut milk makes it a healthier alternative to regular coconut milk and cow milk. This study compares ultrasonic-assisted pasteurization of skim coconut milk to conventional pasteurization technique in terms of contamination reduction efficacy and energy efficiency with minimum product characteristic change. The process consisted of thawing frozen skim coconut milk, homogenization of liquid skim coconut milk and pasteurization in a shaking water bath or ultrasonic bath. Total cell counting was conducted, D-value and z-value were estimated to measure the effectiveness of pasteurization in reducing the number of harmful microorganisms in skim coconut milk. The study found that ultrasonic-assisted pasteurization reduced the number of microorganisms more effectively than conventional pasteurization with a lower energy consumption. The study showed the removal efficiency of ultrasonic-assisted pasteurization and conventional pasteurization at 70°C and 15 minutes were 28.74% and 12.33%, respectively. At that condition, energy consumption for every microbial cell being removed was approximately 3 times lower in ultrasonic-assisted pasteurization than the conventional one (0.13 kWh vs. 0.36 kWh). Skim coconut milk processed by ultrasonic-assisted pasteurization at 75°C for 15 minutes featured homogeneous white liquid with shelf time of 11.2 h, which was 2.65 times longer than the unprocessed coconut skim milk. The research suggests that ultrasonic-assisted pasteurization can be a feasible and sustainable processing technology for skim coconut milk, with potential commercial value for small companies and farmers in Indonesia.
References
Alouw JC, Wulandari S. 2020. Present status and outlook of coconut development in Indonesia. IOP Conference Se ries: Earth and Environmental Science. 418(1):12035. doi: 10.1088/1755-1315/418/1/012035.
Balthazar CF, Santillo A, Guimarães JT, Bevilacqua A, Corbo MR, Caroprese M, Marino R, Esmerino EA, Silva MC, Raices RSL, Freitas MQ, Cruz AG, Albenzio M. 2019. Ultrasound processing of fresh and frozen semi-skimmed sheep milk and its effects on microbiological and physical-chemical quality. Ultrasonics Sonochemistry. 51:241–248. doi:10.1016/j.ultsonch.2018.10.017.
Deshapriya RMC, Rahularaj R, Ransinghe RMSBK. 2019. Mastitis, somatic cell count and milk quality: an overview. Sri Lanka Veterinary Journal. 66(1):1. doi:10.4038/slvj.v66i1.3 2.
Directorate General of Estates Crops. 2022. Statistical of National Leading Estate Crops Commodity. Technical report. Jakarta.
Khuenpet K, Jittanit W, Hongha N, Pairojkul S. 2016. UHT Skim Coconut Milk Production and Its Quality. SHS Web of Conferences. 23:3002. doi:10.1051/shsconf/20162303 002.
Maghsoudlou Y, Alami M, Mashkour M, Shahraki MH. 2015. Optimization of Ultrasound-Assisted Stabilization and Formulation of Almond Milk. Journal of Food Processing and Preservation. 40(5):828–839. doi:10.1111/jfpp.12661.
Munir M, Nadeem M, Qureshi TM, Leong TSH, Gamlath CJ, Martin GJO, Ashokkumar M. 2019. Effects of high pressure, microwave and ultrasound processing on proteins and enzyme activity in dairy systems — A review. Innovative Food Science & Emerging Technologies. 57:102192. doi:10.1016/j.ifset.2019.102192.
Naik A, Raghavendra SN, Raghavarao KSMS. 2012. Production of Coconut Protein Powder from Coconut Wet Processing Waste and its Characterization. Applied Biochemistry and Biotechnology. 167(5):1290–1302. doi:10.1007/s120 10-012-9632-9.
Naik A, Venu GV, Prakash M, Raghavarao K. 2013. Dehydra tion of coconut skim milk and evaluation of functional properties. CyTA Journal of Food. 12(3):227–234. doi: 10.1080/19476337.2013.833296.
Ng CY, Mohammad AW, Ng LY, Jahim JM. 2014. Membrane fouling mechanisms during ultrafiltration of skimmed coconut milk. Journal of Food Engineering. 142:190–200. doi:10.1016/j.jfoodeng.2014.06.005.
Nunes BV, da Silva CN, Bastos SC, de Souza VR. 2022. Microbiological Inactivation by Ultrasound in Liquid Products. Food and Bioprocess Technology. 15(10):2185–2209. doi:10.1007/s11947-022-02818-z.
Ragab ES, Lu J, Pang XY, Nassar KS, Yang BY, Zhang SW, Lv JP. 2019. Effect of thermosonication process on physicochemical properties and microbial load of goat’s milk. Journal of Food Science and Technology. 56(12):5309– 5316. doi:10.1007/s13197-019-04001-3.
Saikhwan P, Somana J, Konkamdee W. 2022. Fouling mechanisms of coconut milk foulants formed during pasteurization. Food and Bioproducts Processing. 136:184–195. doi:10.1016/j.fbp.2022.10.003.
Sarangapany AK, Murugesan A, Annamalai AS, Balasubramanian A, Shanmugam A. 2022. An overview on ultrasonically treated plant-based milk and its properties – A Review. Applied Food Research. 2(2):100130. doi:10.1016/j.af res.2022.100130.
Sukasih E, Prabawati S, Hidayat T. 2009. Optlmasi Kecukupan Panas pada Pasteurisasi Santan dan Pengaruhnya terhadap Mutu Santan yang Dihasilkan. Indonesian Journal of Agricultural Postharvest Research. 6(1):34–42. doi: 10.21082/jpasca.v6n1.2009.34-42.
Vatankhah H, John D, Ramaswamy HS. 2019. Evaluation of thermal and nonthermal treatment of margarine: Pasteurization process efficiency, kinetics of microbial destruction, and changes in thermophysical characteristics. Journal of Food Processing and Preservation. 44(2). doi:10.1111/jfpp.14323.
