The dry chain: Reducing postharvest losses and improving food safety in humid climates

Published on: 02/28/2018
Author/s : Kent J. Bradford a, Peetambar Dahal a, Johan Van Asbrouck b, Keshavulu Kunusoth c, Pedro Bello a, James Thompson d.

1. The problem of postharvest food waste and toxicity A central issue for the 21st century is to continue to feed the growing human population in a sustainable manner, while accommodating the effects of climate change and limiting expansion of agricultural land and water use. Although predictions vary, there is little doubt that the human population will increase to 9 to 10 billion from the prese...

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February 28, 2018
I found this article very interesting, and I learned a lot from it. However, there are two glaring omissions .
1/ DEHUMIDIFYING MACHINES (Electric or Diesel / Electric) are much more efficient than conventional driers, particularly in high RH. They are basically reconfigured Air Conditioners, in which incoming air passes through the Fan Coil, and drops it's moisture. The heat from the Compressor (together with any engine heat) is recycled to reheat the dried air, which is then blown through the grain. These machines can work with existing driers, in lieu of using the burner.
Various chemical additives can be added to moist grain to preserve it's quality, and are widely used in Animal Feed. Organic Acids and their salts (often used in mixtures) are particularly good due to their low toxicity.
These products have become more attractive, due to high energy costs incurred in Drying.
March 3, 2018
Joe Stanyer Low resource households may need to be served with mobile dryers during rainy season though service providers who rent equipment to prepare land and harvest the food.

Minimizing molds in food/feed is a better strategy than adding mold inhibitors. Although preservatives could be added to processed food/feed, there is continuous decline of nutrients in high moisture products. One could minimize such nutrient losses using low temperature that smallholders cannot manage easily.
July 16, 2019
What about Ventilation assisted air drying?
July 16, 2019

We clarified that natural drying could be used in dry seasons/regions. Drying to milling or processing moisture content is the key to achieve safe storage conditions. Seeds do need further drying based on desired storage time. Moisture-proof packaging is needed to maintain the moisture content of dry products (food/feed/seed) achieved by either natural or artificial drying. Usually, the rainy season follows the dry season in most bread basket regions.

July 16, 2019

In my opinion, we have to look at the entire process. If we do the due diligence of checking the grain from the arrival at the plant, checking moisture levels, broken kernels, protein, etc, we can start avoiding a lot of the problems. Again I reiterate that following a HASAP process could help eliminate many problems.
I have observed in the field that many checks in foreign countries are done by the guards at the entrance to the farm and weights. They are not familiar with the 8 points of testing the truck, therefore a lot gets missed. In many countries also determined by using a UV light to see aflatoxin in grains and not other toxins that may be present. Remember all start with the raw material and end up in the feed. Storage conditions also may affect damage by mycotoxins due to insect and rats fecal mater. No matter all ingested mycotoxins will affect the animal organs. Using a good mold absorbent that includes, probiotics, prebiotic, mold inhibitors, clay and cilimarine will help re Genaro the live damaged by mycotoxins. Not only we should lol at the problem, but also look at a good solution. We all know the damaged caused by mycotoxins contamination, therefore we need to find resolutions and implementation.

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Kurt A. Rosentrater
Kurt A. Rosentrater
Associate Professor
  Ames, Iowa, United States
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