Mango
seeds from agro‐industry represents an environmental problem due to
the amounts of by‐products produced. Conversely, poly (lactic acid)
(PLA) is a potential green alternative to conventional plastics. The
goal of this study aimed to develop a biocomposite based on PLA and
mango’s by‐product for rigid packaging. Six biocomposites are
obtained by extrusion/injection processing using formulations with
PLA as a matrix and up to 20% by weight of mango seed’s
by‐products. The materials are characterized by chemical and
physical analysis; scanning
electron microscopy/energy dispersive X‐ray, X‐ray diffraction;
Fourier transform infrared spectroscopy (FTIR); thermal gravimetric
analysis/differential thermogravimetry; differential scanning
calorimetry (DSC), and mechanical analysis. FTIR bands and DSC transitions related to starch are higher in the kernel,
while more cellulose
bands are found in the integument. Kernel
presented thermal degradation in the biocomposites, the sample PLA+20
wt% kernel. For the other compositions, it is possible to observe
that they could keep their morphology. Significant improvements
in both mechanical and barrier properties are found in the formulation with 20 wt%
integument (up to 38% in elastic modulus). Therefore, this study
suggests that biocomposites
developed from PLA / Integument / Kernel have potential as a new biomaterial for rigid food packaging systems.
Enrofloxacin can be slowly delivered through polymeric systems and the addition of oil could increase the polymeric gels hydrophobicity and help the continuous release. The present work intended to develop and characterize microstructurally (XRD and FTIR) and in vitro (swelling and antimicrobial tests) the PVA hydrogels loaded with copaiba oil and Duotrill (enrofloxacin) to treat bacterial infections, as pyelonephritis, in the veterinary field. Duotrill and oil combined diminished the gels degree of crystallinity and it was observed interaction between phases due to a new band found only in PVA hydrogels loaded with copaiba oil and Duotrill (PVA-DO) FTIR spectrum. The samples with oil swelled less than samples without it, where copaiba oil altered the samples' hydrophilicity. PVA-DO presented lower weight loss and higher gel fraction than PVA, indicating the loaded material increased the gels stability. All samples containing oil and Duotrill inhibited S. aureus.
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