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Biodegradable Poly(butylene adipate‐ co ‐terephthalate) Films Incorporated with Nisin: Characterization and Effectiveness against Listeria innocua
Author(s) -
Bastarrachea Luis,
Dhawan Sumeet,
Sablani Shyam S.,
Mah JaeHyung,
Kang DongHyun,
Zhang Jinwen,
Tang Juming
Publication year - 2010
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1750-3841.2010.01591.x
Subject(s) - nisin , adipate , crystallization , ultimate tensile strength , glass transition , materials science , nuclear chemistry , chemistry , chemical engineering , polymer chemistry , organic chemistry , composite material , polymer , antimicrobial , engineering
Biodegradable poly(butylene adipate‐ co ‐terephthalate) (PBAT) films incorporated with nisin were prepared with concentrations of 0, 1000, 3000, and 5000 international units per cm 2 (IU/cm 2 ). All the films with nisin inhibited Listeria innocua , and generated inhibition zones with diameters ranging from 14 to 17 mm. The water vapor permeability and oxygen permeability after the addition of nisin ranged from 3.05 to 3.61 × 10 11 g m m −2 s −1 Pa −1 and from 4.80 × 10 7 to 11.26 × 10 7 mL·m·m −2 ·d −1 ·Pa −1 , respectively. The elongation at break (ɛ b ) was not altered by the incorporation of nisin ( P > 0.05). Significant effect was found for the elastic modulus ( E ) and the tensile strength (σ s ) ( P < 0.05). The glass transition and melting temperatures with the presence of nisin ranged from −36.3 to −36.6 °C and from 122.5 to 124.2 °C, respectively. The thermal transition parameters such as the crystallization and melting enthalpies and crystallization temperature were influenced significantly ( P < 0.05) by incorporation of nisin into films. The X‐ray diffraction patterns exhibited decreasing levels of intensity (counts) as the concentration of nisin increased in a range of 2θ from 8° to 35°. Formation of holes and pores was observed from the environmental scanning electron microscopy images in the films containing nisin, suggesting interaction between PBAT and nisin.