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Validation of a Passive Solar Drying System Using Pineapple.

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  • 1Chemical and Biomolecular Engineering Program, Physics and Chemistry Department, Milwaukee School of Engineering, Milwaukee, WI 53202, USA.

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Summary

The Agricycle passive solar drier offers a cost-effective solution for preserving produce in Sub-Saharan Africa. While some nutrient loss occurred, solar-dried fruits met safety standards, showing promise for food preservation.

Keywords:
dryingfreeze-dryingpineapplepreservationsolar drying

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Area of Science:

  • Agricultural Engineering
  • Food Science
  • Postharvest Technology

Background:

  • Significant postharvest produce losses occur in Sub-Saharan Africa, nearing 50% before market.
  • Developing cost-effective preservation methods is crucial to mitigate food waste.

Purpose of the Study:

  • To evaluate the efficacy of the Agricycle passive solar drier for fruit preservation.
  • To compare the nutritional and quality attributes of solar-dried produce with freeze-dried samples.

Main Methods:

  • Simulated Sub-Saharan Africa environment using a psychrometric chamber.
  • Analysis of vitamin C, total phenolics, iron, microbial content, water content, dissolved solids, color, and microstructure.
  • Comparison with freeze-dried and fresh produce.

Main Results:

  • Nutritional content (vitamin C, phenolics, iron) was comparable, though vitamin C showed a significant loss.
  • Solar-dried samples had microbial content below standard limits and approximately 10% water content.
  • Significant differences in color and microstructure were observed between solar-dried and freeze-dried samples.

Conclusions:

  • The Agricycle passive solar drier is a viable and promising technology for food preservation.
  • It offers a cost-effective alternative for reducing postharvest losses in regions like Sub-Saharan Africa.