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Proper Bulk Storage
A chemical-free way to avoid insects and spoilage...
Humans aren't the only living creatures to thrive in the warmer mos. of summer. Insects like the summer also, and a favorite residence might just be that bag of whole wheat flour you brought home from the Co-op a couple of weeks ago. There are two simple and earth-friendly steps you can take to prevent bugs from thriving in your food, however, and these steps will also lengthen the shelf of the items.
Store the items in air-tight containers. Glass, according to one Co-op Bulk expert, is best (insects can't nibble through it); websites advise air-tight containers, filled as full as possible to reduce any exposure to air. Some products benefit from protection from the sun, also; flaxseed meal, for example, should be stored in opaque containers that obstruct light so that the valuable omega-3 fatty acids won't deteriorate. One advantage to using your own containers for bulk items is that the containers, while being weighed at the service desk, are also dated; you know when the item was purchased. (Could you say that for the jar of salsa?)
Temperature is a crucial element in avoiding insects and spoilage. Freeze the item for 48 hours. Freezing for two full days kills any possible random insect eggs. The freezer, if there's room, is also a good storage spot for flours. Just be sure that the flour is in an airtight plastic bag or container, with all excess air removed. Flours with fat will go rancid more quickly than low-fat flours, so the whole-grain flours we love, with their essential germ, are more delicate than the more processed flours with the germ removed.
To see this chart, please see p. 12 of the pdf version of the Coop Scoop.
"Freeze Them or Fry Them," Fumigants and Pheromones 37 (Winter 1995). Thanks to Bob Linn for sharing this article with me.

www.recipetips.com/kitchen-tips/t--1039/flour-storage-guide.asp

Elizabeth Yetter, "How to Store Flour," from http://breadbaking.about.com/od/beginnerbasics/ht/storeflour.htm.
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