Abstract
The effectiveness of edible films (EFs) used as coatings to maintain the quality and safety of fresh produce for long time depends on their functional properties characterization. This study was aimed to design and evaluate physicochemical, barrier, mechanical, and antimicrobial properties of EFs based on corn starch (acetylated cross-linked (ACLS) or oxidized (OS)), micro-emulsified beeswax (BW, 0–1 % w/w), and two natural antimicrobials (lauric arginate (LAE, 400–4000 mg/L) and natamycin (NAT, 80–800 mg/L)). EFs based on ACLS or OS made with 1 % BW microemulsion produced homogeneous EFs surface and did not show changes in thickness or opacity. Water vapor permeability (WVP, 0.57 ± 0.04 g mm m−2 h−1 kPa−1 for ACLS, and 0.56 ± 0.05 g mm m−2 h−1 kPa−1 for OS) was reduced; tensile strength (TS, 51.48 ± 5.92 MPa for ACLS, and 40.96 ± 4.98 MPa for OS), and elastic modulus (EM, 211.30 ± 7.85 MPa for ACLS, and 203.50 ± 5.35 MPa for OS) were decreased, whereas elongation at break (E, 4.59 ± 1.11 % for ACLS, and 4.76 ± 4.98 % for OS) increased. The additive effect showed by the combination of natural antimicrobials (2000 mg/L of LAE plus 400 mg/L of NAT) incorporated into EFs with 1 % BW completely inhibited Rhizopus stolonifer, Colletotrichum gloeosporioides, Botrytis cinerea, and Salmonella Saintpaul. These properties of corn starch EFs used as coatings represent an excellent alternative to extend the shelf life of fresh produce.
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Abbreviations
- ACLS:
-
Acetylated cross-linked starch
- BW:
-
Beeswax
- E:
-
Elongation at break
- EFs:
-
Edible films
- EM:
-
Elastic modulus
- LAE:
-
Lauric arginate
- NAT:
-
Natamycin
- OS:
-
Oxidized starch
- PDA:
-
Potato dextrose agar
- PDB:
-
Potato dextrose broth
- RBA:
-
Rose bengal agar
- RH:
-
Relative humidity
- TS:
-
Tensile strength
- TSA:
-
Tryptone soy agar
- TSB:
-
Tryptone soy broth
- WVP:
-
Water vapor permeability
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Acknowledgments
We are grateful to CONACyT for PhD grant to Teresita Arredondo Ochoa, and financial support for project No. 166751. We thank MS Ana Lucía Tovar Álvarez for technical support on micrographs.
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Ochoa, T.A., Almendárez, B.E.G., Reyes, A.A. et al. Design and Characterization of Corn Starch Edible Films Including Beeswax and Natural Antimicrobials. Food Bioprocess Technol 10, 103–114 (2017). https://doi.org/10.1007/s11947-016-1800-4
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DOI: https://doi.org/10.1007/s11947-016-1800-4