Assessment of thermal, crystalline and morphological properties of ellagic acid incorporated PVA, chitosan, PVA/chitosan and PVA/chitosan/gaur gum polymeric films

Abstract

In the present study, the ellagic acid doped Polyvinyl alcohol (PVA), Chitosan (CS), PVA/CS and PVA/CS/Guar-gum blend films were prepared and coded as EA-1, EA-2, EA-3 and EA-4, respectively. The physicochemical properties of prepared films were analyzed by using different instrumental techniques. The differential scanning calorimetry (DSC) and Fourier transform infrared (FT-IR) results revealed the good interaction and miscibility among the components of the films. The thermal stability of ellagic acid incorporated PVA film (EA-1) shown more thermal stability in contrast with other films confirmed by thermogravimetric analysis (TGA) analysis. From the results of X-ray diffraction (XRD) study, the increased amorphous nature was observed for the EA-3 and EA-4 films. Surface morphology was analyzed by using scanning electron microscopy (SEM) and atomic force microscopy (AFM) which illustrates that prepared films exhibits smooth and homogeneous surface after blending with ellagic acid. The results obtained by measuring water contact angles (WCA) revealed that all the films have hydrophilic nature. All the prepared films have exhibited good mechanical properties, hence prepared films can act as promising material for food packaging application.

Graphical Abstract

Keywords:

• Polyvinyl alcohol
• chitosan
• guargum
• ellagic acid
• blend films

Acknowledgments

The authors gratefully acknowledge the facilities provided by University Science Instruments Center (USIC), DST-SAIF and DST PURSE- Phase II Programme, Karnatak University, Dharwad, Karnataka, India, also Dr. Saraswati P Masti Principal investigator DST-SERB Project, No. SB/EMEQ-213/2014, Department of Chemistry, Karnatak Univesity’s, Karnatak Science College, Dharwad, Karnataka, India, for their support to this study.

Author contribution

All the authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Vinayak N. Vanjeri, Vishram D. Hiremani, Naganagouda Goudar, Oshin D’souza, Jennifer P. Pinto, Anilkumar R Patil, Shivayogi S. Narasagoudr, Saraswati P. Masti, Ravindra B. Chougale. The first draft of the manuscript was written by Vinayak Vanjeri and all the authors commented on previous version of the manuscript. All authors read and approved the final manuscript.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

All data generated or analyzed during this study are included in the article.

Additional information

Funding

The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.