Saturday, January 8, 2011

What is Life? About Soap(石けんについて)

Good morning everyone. What did you feel about the special class about the evolution from invertebrates to vertebrates? It was snowing at F city like storm. The roads were frozen, the people had to totter with care. Anyway, today's theme is about Soap.


The soap is necessary for our life. It is used for various opportunity, for example washing face, hands, hair, dishes, clothes, and heart(^^;). To say the truth, the soap is defined as sodium salt of higher (long chain) fatty acid. It was taught in chemical class of senior high school from text book. You may be surrounded with many fatty acids or soaps. Why are they necessary for our life? What is the point to select oil or soap?


Recently, the used oils are utilized as source of soap. You may have such soaps smelled of TENPURA. I don't like it for daily use. But the oil for fry is one of the familial higher fatty acid in our life. Not only for home use but also for restaurant use, large amount of oil are used and waste as dust. When such oil are discarded to the kitchen sink, it will be cause of environmental pollution. Because the oil has rich carbon (high energy), the river or sea become eutrophied.


One of the resolution is to make soap from used oil. When the sodium hydroxide or potassium hydroxide are given for the oil, the salt is produced as a result of chemical reaction as soap.


Such production of soap is the best for expressing the importance of recycle against the people. However, one of the most important point is matching for your face or hands. Such matching information is derived from species, molecular length, saturation, unsaturation, metal, or additional components. Unfortunately, Sammy is a biologist, I don't have enough background to explain it. So if you are a chemist and know the point, please inform me about it. We want to know it.


Today's class is over. Have a nice day. Click the button at the bottom of this "What is Life?", if you are a student of this class. Mind you? If you have any question about life, please send an e-mail for me.


にほんブログ村 科学ブログ 生物学・生物科学へ人気ブログランキングへ


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