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PROCESSING OF PEACH NECTAR BY PULSED ELECTRIC FIELDS WITH RESPECT TO PHYSICAL AND CHEMICAL PROPERTIES AND MICROBIAL INACTIVATION
Author(s) -
ALTUNTAŞ JULIDE,
AKDEMIR EVRENDILEK GULSUN,
SANGUN MUSTAFA K.,
ZHANG HOWARD Q.
Publication year - 2011
Publication title -
journal of food process engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 45
eISSN - 1745-4530
pISSN - 0145-8876
DOI - 10.1111/j.1745-4530.2009.00549.x
Subject(s) - chemistry , food science , pasteurization , nectar , browning , erwinia , sterilization (economics) , listeria monocytogenes , botany , biology , bacteria , biochemistry , pollen , genetics , gene , monetary economics , foreign exchange , economics , foreign exchange market
Applicability of pulsed electric fields (PEFs) to process peach nectar as a function of electric field strength and treatment time with respect to microbial inactivation and measurement of physical and chemical properties of peach nectar was evaluated. No significant difference was detected in terms of pH, °Brix, titration acidity (TA), conductivity, color ( L *, a * and b*), nonenzymatic browning index (NBI), metal ion concentration, ascorbic acid content and beta carotene concentration between control and PEF‐treated peach nectar samples (P > 0.05). On the other hand, Escherichia coli O157:H7, Staphylococcus aureus, Listeria monocytogenes, Erwinia carotowora, Pseudomonas syringae, Botrytis cinerea and Penicillum expansum were significantly inactivated (P ≤ 0.05). PEF can successfully be applied to peach nectar with significant amount of microbial inactivation without a significant adverse effect on physical and chemical properties.PRACTICAL APPLICATIONS Pulsed electric field (PEF) processing, considered a novel technology, posses a significant potential to achieve nonthermal (cold) pasteurization and/or sterilization of liquid materials, especially fruit juices. This study was performed to determine potential use of PEF to process peach nectar based on the measurement of changes in physical and chemical properties as well as in microbial inactivation. PEF processing significantly inactivated inoculated microorganisms without adverse effects on both physical and chemical properties. Based on the results, it can be concluded that PEF technology can successfully be applied pasteurization of peach nectar.