【Famous Column】Professor Zhao Mingwei / All people save water! Who is the best at washing dishes and vegetables with soybean flour and baking soda?

Text: Toxic expert/Professor of the Department of Biotechnology of Chung Yuan University, Prof. Zhao Mingwei

Taiwan is facing the lowest rainfall in more than 50 years. Many reservoirs in the central and southern parts of the country have dried up and bottomed out. Some counties and cities such as Miaoli, Taichung, Changhua, and Tainan have begun to implement water restriction measures. Taichung City even excavated groundwater for citizens. Alleviating urgent needs, saving water and storing water, have become a common issue for the whole people! In particular, it affects the washing of vegetables and dishes in daily life and diet. How to wash cleanly so as not to eat germs, and at the same time save water, is really nerve-racking.

The ancient wisdom of our ancestors used soybean powder, bitter gourd powder, flour and other powders to first sprinkle on the bowls and plates to absorb oil stains when washing dishes, and then rinse them off with a small amount of water, and it is easy to use; but plant powders (soybean powder, Bitter gourd powder, flour, etc.) itself contains high phosphorus and fiber. If used for a long time and in large quantities, it may indeed cause the risk of optimizing the river and blocking the water pipe.

The principle of “optimization” is that substances with “phosphorus ions” are discharged into rivers to become food for algae and microorganisms, and a large number of algae grow to cover the water surface, resulting in the death of fish and shrimp living in the water due to lack of oxygen. Although the phosphorus content of soybean flour is not high, it is only about 250 mg per 100 grams. The daily amount of washing dishes is actually not too much. Even if the residue is eaten, it will not exceed the maximum daily intake of phosphorus of 800 mg. It is also the same reason that the European Union has strictly restricted the phosphate content of washing powder and laundry detergent since 2013.

In addition, because plants are born with a lot of fiber, it is not easy to dissolve, so eating more vegetables can help defecation. The same logic, the fiber will not disappear after the plant is ground into powder, and it is easy to stick in the case of insoluble in water. Attachment and accumulation on the wall of the water pipe will naturally affect the drainage in the long run. If it is not a last resort, it is not recommended to use this method.

As far as dishwashing alternatives are concerned, baking soda powder may be better than plant powder. The method of use is very simple. Just take an appropriate amount of baking soda powder and add water, and soak the cups and pans in the baking soda water for about 30 to 60 seconds. After a simple shake and scrub, even the stubborn tea stains that have remained for many years can be effectively removed.

Baking soda is a weak alkaline powder and is corrosive, so it is very useful for cleaning “hard objects” such as cups, bowls and pans. However, if it is used for soft substances, such as washing vegetables, special attention should be paid to the usage and dosage. , using too much or soaking for too long, it is easy to corrode the fiber of vegetables, making the vegetables soft and not crisp.

The correct way to wash vegetables with baking soda powder:
Step 1: First, take an appropriate amount of baking soda powder and throw it into the water to dissolve
it. Step 2: Soak the vegetables in the baking soda water for about 10 to 15 seconds and then pick it up
. Step 3: Rinse with water.

The principle of dishwashing is mainly to use external force to destroy the oily structure, which can be separated from the dishes. “Detergent power” is the key point. No matter whether you use dishwashing liquid, soybean powder, or baking soda water, if the dirt cannot be removed, rinse it with clean water to avoid residue. , it can not achieve the purpose of washing dishes, just imagine, the soybean flour mixed with oil is also disgusting to eat if it is not rinsed, and it is naturally dirty.

Dishwashing detergent is a chemical substance, plant powder has environmental pollution problems, baking soda is corrosive, and even artificial rain (the rain bombs launched into the air use silver iodide to increase the condensation of water vapor) can not avoid the residual silver iodide component, no matter where None of them can be comprehensive, and a small amount will not be harmful. The key is to choose the most effective method when there is a limited water source. Only in the “appropriate amount” but not too much can we live in peace with nature.

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