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Bioplastics01:27

Bioplastics

Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...

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Biodegradable Colorimetric Indicative Films Based on Kurugua (Sicana odorifera) Peel Powder.

Orlando Duarte1, Germán Ayala Valencia2, Omayra B Ferreiro1,3

  • 1Faculty of Chemistry, National University of Asunción, San Lorenzo 1055, Paraguay.

Polymers
|May 14, 2025
PubMed
Summary

New colorimetric films using kurugua peel powder indicate food freshness by changing color with pH. These intelligent films show potential for the food industry.

Keywords:
anthocyaninscolor change of the filmscolorimetric indicator filmskurugua peel

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Area of Science:

  • Food Science
  • Materials Science
  • Biochemistry

Background:

  • Colorimetric films serve as food freshness indicators by reacting to pH changes during decomposition.
  • Anthocyanins, bioactive compounds found in kurugua peel, exhibit pH-dependent color variations, making them suitable for indicator films.

Purpose of the Study:

  • To evaluate colorimetric indicator films made from cassava starch and kurugua (Sicana odorifera) peel powder.
  • To assess the impact of kurugua peel powder on film properties and their performance as freshness indicators.

Main Methods:

  • Films were prepared using cassava starch with varying proportions of kurugua peel powder via casting.
  • Film properties (thickness, solubility, humidity, contact angle, density, opacity) were analyzed.
  • Raman spectroscopy confirmed the presence of starch and anthocyanins.
  • Color change was tested at different pH levels and during application to monitor chicken meat freshness.

Main Results:

  • Kurugua peel powder addition altered film properties, including thickness, solubility, humidity, water contact angle, density, and opacity.
  • Raman spectra confirmed the presence of characteristic starch and anthocyanin peaks.
  • The developed films (PA and PB) demonstrated color changes (green, yellow) at high pH and effectively monitored chicken meat freshness.

Conclusions:

  • Cassava starch-based films incorporating kurugua peel powder function as effective colorimetric indicators.
  • These films show promise as active and intelligent indicators for monitoring food freshness in the food industry.