Mild heat pasteurization, high pressure processing (HP) and pulsed electric field (PEF) processing of freshly squeezed orange juice were comparatively evaluated examining their impact on microbial load and quality parameters immediately after processing and during two months of storage. Microbial counts for treated juices were reduced beyond detectable levels immediately after processing and up to 2 months of refrigerated storage. Quality parameters such as pH, dry matter content and brix were not significantly different when comparing juices immediately after treatment and were, for all treatments, constant during storage time. Quality parameters related to pectinmethylesterase (PME) inactivation, like cloud stability and viscosity, were dependent on the specific treatments that were applied. Mild heat pasteurization was found to result in the most stable orange juice. Results for HP are nearly comparable to PEF except on cloud degradation, where a lower degradation rate was found for HP. For PEF, residual enzyme activity was clearly responsible for changes in viscosity and cloud stability during storage. Industrial relevance: Development of mild processing technologies with a minimal impact on fruit juice can be considered as a true alternative of fresh fruit. The present work presents a fair comparison of mild heat treated, high pressure (HP) and pulsed electric field (PEF) processed orange juice as an alternative for thermal pasteurization. Orange juices were monitored during two months of storage.
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Powerpointpresentatie gebruikt tijdens een VIDA webinar op 25 september 2019.
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This advisory report describes the results and recommendations for Indian dairy farmers and Dutch and Indian companies, from the RAAK Family Dairy Tech India project. Researchers and students of two Dutch and one Indian University of Applied Sciences, together with ten Dutch companies, Indian companies and eight innovative farmers in Pune district collaborated to develop robust and affordable technologies and knowledge for Indian medium sized dairy farmers, in Pune district, Maharashtra. The report also describes innovations in the farmers’ business models and value chains.
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