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Antimicrobial activity of nisin incorporated in pectin and polylactic acid composite films against Listeria monocytogenes
Author(s) -
Jin Tony,
Liu LinShu,
Zhang Howard,
Hicks Kevin
Publication year - 2009
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/j.1365-2621.2008.01719.x
Subject(s) - nisin , pectin , listeria monocytogenes , polylactic acid , orange juice , composite number , food science , ultimate tensile strength , chemistry , antimicrobial , materials science , composite material , bacteria , polymer , organic chemistry , biology , genetics
Summary An extruded composite food packaging film containing pectin, polylactic acids (PLAs) and nisin was developed to inhibit Listeria monocytogenes . The mechanical properties and surface structure of the film were also examined. Cells of L. monocytogenes were reduced by 2.1, 4.5 and 3.7 log units mL −1 by the pectin plus PLA (pectin/PLA) film containing nisin (1000 IU mL −1 of tested liquid) in Brain Heart Infusion (BHI) broth, liquid egg white and orange juice, respectively, after 48 h at 24 °C. Pectin played an important roll in embedding nisin into the film. The pectin/PLA film had a similar stiffness but lower tensile strength, elongation and fracture energy than the pure PLA film. These data suggested that nisin incorporated into the pectin/PLA film was an effective approach to reducing L. monocytogenes in a typical growth medium (e.g. BHI broth) as well as in foods (e.g. orange juice and liquid egg).