J. Technology and Education , Vol.27, No.1, pp.15-19 (2020)





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Basic study of friction reduction by using mucin (glycoprotein) and trial of the presumption method



Tomoaki KOUYACHisako OOKA and Takashi KUWAHARA

National Institute of Technology, Oyama College

(771 Nakakuki, Oyama City, Tochigi Prefecture 323-0806, JAPAN)

National Institute of Technology, Gunma College

(580 Toriba, Maebashi, Gunma, 371-8530 Japan)

Nagaoka University of Technology, Department of Bioengineering

(1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, JAPAN)


(Received February 24, 2020; Accepted March 23, 2020)


Mucins are glycoproteins, and the functions of the mucins include the lubrication of the surfaces and protection from chemical, physical, and bacterial impact damage in vivo. Mucin is found in animal epithelial cell surfaces, saliva, and the stomach. The average molecular weight of pig stomach mucin is about 9 million. In this study, the lubrication ability of mucin was tested in a friction test of pig mucin (to examine the effect of mucin on friction). For the friction test, a mucin solution droplet was poured between stainless steel plates, and the surface friction was measured by a bearing tester. The data measured a static friction coefficient and a dynamical friction coefficient after 100 times of round-trip friction. The results showed that a mucin solution between metal plates has a friction reduction effect. Improvement was seen in the effect in comparison with no lubrication and water only. In the future, we will try to experiment with replacing the metal with cloth or artificial skin.

Key words: mucin / friction / glycoprotein