APPLICATION OF LOW DENSrTY POL YETHYLENE FILMS: 1· THEIR MECHANICAL, PHYSICAL AND AN IMICROBIAL PROPERTIES | ||
| Journal of Food and Dairy Sciences | ||
| Article 3, Volume 28, Issue 3, March 2003, Pages 1865-1877 PDF (559.27 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jfds.2003.243999 | ||
| Author | ||
| A. T. EI-Akel, | ||
| Food Technology Dept., Fac. Of Agrlc., Cairo Univ. | ||
| Abstract | ||
| This study was carried out to evaluate low density polyethylene (LDPE) films, of 180 microns thickness. when impregnated with potassium sorbate or calcium propionate (at the concentrations of 1 ,2,3 and 4% w/w) which were processed by the blown film extrusion process. LOPE films were examined tor their ppysical properties (i.e. haze, gloss, waler vapor permeability, oxygen permeability, heat seatability and shrinkability) besides, their mechanical properties (I.e. tensile strength, elongation, slip, tear Slrength and burst slrength). Mechanical and physical proper1ies were significantly affected by the inccrpcration of potaSSium sorbate or calcium propionate up to 4% (wJw) in the films as their haze, Willer vapor permeability, slip and burst strength increased. while their gloss, heat sealability, shrinkability tensile strength, e/ongaoon, tear strength and oxygen permeability decreased as th~ concentration of potassium sorbate or calcium propionate increased in the films. LOPf films were also tested against some species of microorganisms on agar plate medium, from whICh it was noticed thai, the inhibitory effect of !he films agajnslthe growth of AspergiHus nevus, Fusarium oxysporium, Penicillium chrysogenum OSM 844 in a disk test was higher than thai in case or BaciHus suM/is, E. cO/i and S. eureas as the concentration of potaSl;ium sorb ate or calcium propionafe Increased up to 4%. | ||
| Keywords | ||
| Antimicrobial packaging films; low density polye ylene. calcium propionate; potassium sotbate | ||
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