Synthesis and characterization of lignin-poly lactic acid film as active food packaging material

ABSTRACT

The present work describes the synthesis, characterisation and antimicrobial activity of lignin-polylactic acid (PLA) blended film. Film was prepared using co-polymerisation reaction of lignin and lactic acid in the presence of stannous chloride as a catalyst and poly(vinyl alcohol) to get the uniform film. The properties of the film was studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and thermo-gravimetric analysis (TGA), respectively. The lignin-PLA film demonstrated a significant decrease in swelling ratio and tensile strength in contrast to PLA film. SEM analysis revealed proper blending of lignin into PLA matrix with slightly rough surface. Film was thermostable and amorphous in nature as confirmed from the thermal study and XRD analysis, respectively. Further, significant improvement was observed in antimicrobial activity and biodegradability of PLA film after addition of lignin, which suggest the putative application of lignin-PLA film as the food packaging and mulch film materials.

KEYWORDS:

• Lignin
• poly lactic acid (PLA)
• biodegradability
• antimicrobial activity

Acknowledgments

The authors also acknowledge the funding from UGC SAP project no. F.3-14/2016/DRS-I (SAP-II). The authors are grateful to Dr Sanjay Lanjhiana, Pharmacy Department, GGV, Bilaspur, Department of Physics, Pt. Ravishankar Shukla University, Raipur and Sagar University, Madhya Pradesh, India for the sample analysis.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The work was supported by the grants from Chhattisgarh Council of Science and Technology (CCOST), Raipur, India (sanction order no: 2142/MRP/2015).