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Dielectric barrier discharge plasma for microbial decontamination of dried laver: effects on physicochemical characteristics
Author(s) -
Kim JeWook,
Puligundla Pradeep,
Mok Chulkyoon
Publication year - 2015
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1111/ijfs.12933
Subject(s) - dielectric barrier discharge , chemistry , human decontamination , plasma , atmospheric pressure , atmospheric pressure plasma , bacteria , food science , kinetics , aerobic bacteria , analytical chemistry (journal) , environmental chemistry , electrode , biology , physics , oceanography , quantum mechanics , nuclear physics , genetics , geology
Summary Dielectric barrier discharge ( DBD ) plasma in atmospheric pressure air was used for microbial decontamination of thin sheets of dried laver, which are commonly used in kimbab preparation. Microbial contaminants namely aerobic bacteria, moulds and marine bacteria were found in sun‐dried laver sheets. DBD plasma was generated at an output voltage of 30 kV AC and a frequency of 30 kHz. Upon the plasma treatment of laver, 2.5‐log (99.68%), nearly 1.5‐log (96.84%) and above 1.0‐log (90%) unit reductions in viable counts of aerobic bacteria, marine bacteria and moulds were observed over a 10‐min period, respectively. The inactivation pattern fitted well to Singh–Heldman model or pseudo first‐order kinetics. Compared to control laver, no significant ( P > 0.05) changes in the colour characteristics, total phenolic content and 2,2‐diphenyl‐1‐picrylhydrazyl radical scavenging activity were observed in plasma‐treated laver. Furthermore, DBD plasma‐treated laver sheets had exerted no negative impact on the sensory characteristics of kimbab and can extend the shelf life.