The behavior of the foodstuffs covered by three different films as
foodstuffs covering: a commercial polypropylene bag, SPI-Poly
Lactic Acid (PLA) 60/40 film without active agent (control) and
SPI-PLA 60/40 film containing natamycin as antifungal agent (0.33%
w/w of SPI) was studied by Gonzalez and Alvarez Igarzabal (2013)
(Fig. 6). The behavior of the coated foodstuffs stored under
similar conditions for all foods was studied for a maximum period
of 55 days. Tensile strength (TS), elongation at break (EB) and
Young's modulus (E) of the control sample (SPI-100) were
1.08 ± 0.34, 24.63 ± 0.13 and 22.80 ± 6.14 respectively. It was
observed that the film-containing natamycin could delay the
appearance of mold in the tomato for more than 13 days with
respect to the polypropylene commercial bag. The study in apple
after 55 days concluded that the highest growth of mold was found
in the commercial polypropylene packaging, and that the appearance
of mold could be delayed for at least 29 days with respect to
the polypropylene commercial bag using the natamycin containing
film.