Why do pinto beans get slimy when you soaked them?

Soaking beans can cause them to become slimy due to the release of starch. Starch is a type of carbohydrate that absorbs water and swells when exposed to moisture. As beans soak, they absorb water and the starch within the beans begins to break down and release its molecules. These molecules then move through the water and interact with oxygen from the air, creating a slimy film on the surface of the beans.

In addition, during the soaking process, the beans' natural protective coating is softened, exposing more starch granules. These granules are then more easily broken down by enzymes and bacteria present in the water, contributing to the slimy texture.

To prevent or reduce sliminess, there are a few things that can be done:

1. Rinse the beans thoroughly before soaking. This will help remove some of the starch and other impurities that can contribute to sliminess.

2. Use cold water for soaking. Hot water can cause the beans to break down more quickly and release more starch.

3. Change the soaking water at least once. This will help remove any bacteria or slime that may have developed.

4. Soak the beans for the recommended amount of time. Over-soaking can lead to the beans becoming mushy and slimy.

5. Cook the beans thoroughly after soaking. This will kill any bacteria and help ensure the beans are safe to eat.