Water sensitivity, antimicrobial, and physicochemical analyses of edible films based on HPMC and/or chitosan.
Several properties of chitosan films associated or not with hydroxypropylmethylcellulose polymer (HPMC) and HPMC films incorporating or not nisin and/or milk fat were studied. Nisin addition at a level of 250 microg mL-1 and likewise chitosan at 1% (w/v) concentration were efficient for total inhibiting Aspergillus niger and Kocuria rhizophila food deterioration microorganisms. HPMC and chitosan films were transparent, whereas nisin and/or fat incorporation induced a 2-fold lightness parameter increase and, consequently, involved more white films. Measurements of tensile strength, as well as ultimate elongation, showed that chitosan and HPMC initial films were elastic and flexible. High thermal treatments and additive incorporation induced less elastic and more plastic films. Water vapor transmission as far as total water desorption rates suggested that chitosan films were slightly sensitive to water. Water transfer was decreased by <60% as compared with other biopolymer films. Regarding its hydrophobic property, the capacity of fat to improve film water barrier was very limited.
Sebti
Issam
I
Laboratoire de Recherche en Génie Industriel Alimentaire EA 3733, IUT A, Département Génie Biologique, Université Lyon 1, Rue Henri de Boissieu, F-01060 Bourg-en-Bresse cedex 09, France. sebti@iutbourg.univ-lyon1.fr
Chollet
Emilie
E
Degraeve
Pascal
P
Noel
Claude
C
Peyrol
Eric
E
D000818:Animals; D000890:Anti-Infective Agents / Q000494:pharmacology*; D001234:Aspergillus niger / Q000187:drug effects; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D048271:Chitosan / Q000737:chemistry* / Q000494:pharmacology; D005223:Fats / Q000737:chemistry; D018857:Food Packaging / Q000295:instrumentation*; D065347:Hypromellose Derivatives; D008747:Methylcellulose / Q000031:analogs & derivatives* / Q000737:chemistry / Q000494:pharmacology; D008835:Micrococcaceae / Q000187:drug effects; D008892:Milk / Q000737:chemistry; D009561:Nisin / Q000737:chemistry; D014867:Water / Q000737:chemistry*
D000890:Anti-Infective Agents; D005223:Fats; D014867:Water; D009561:Nisin; D065347:Hypromellose Derivatives; D008747:Methylcellulose; D048271:Chitosan