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Int. J. Environ. Res. Public Health 2010, 7(9), 3489-3498; doi:10.3390/ijerph7093489

Acetaldehyde Removal from Indoor Air through Chemical Absorption Using L-Cysteine

1
Department of Urban Engineering, School of Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan
2
Department of Environment Systems, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa-no-ha 5-1-5, Kashiwa-shi, Chiba 277-8563, Japan
3
Tokyo Metropolitan Industrial Technology Research Institute, Nishigaoka 3-13-10, Kita-ku, Tokyo 115-8586, Japan
*
Author to whom correspondence should be addressed.
Received: 1 August 2010 / Revised: 31 August 2010 / Accepted: 14 September 2010 / Published: 17 September 2010
(This article belongs to the Special Issue Indoor Air Pollution and Human Health)
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Abstract

The irreversible removal of acetaldehyde from indoor air via a chemical reaction with amino acids was investigated. To compare effectiveness, five types of amino acid (glycine, L-lysine, L-methionine, L-cysteine, and L-cystine) were used as the reactants. First, acetaldehyde-laden air was introduced into aqueous solutions of each amino acid and the removal abilities were compared. Among the five amino acids, L-cysteine solution showed much higher removal efficiency, while the other amino acids solutions didn’t show any significant differences from the removal efficiency of water used as a control. Next, as a test of the removal abilities of acetaldehyde by semi-solid L-cysteine, a gel containing L-cysteine solution was put in a fluororesin bag filled with acetaldehyde gas, and the change of acetaldehyde concentration was measured. The L-cysteine-containing gel removed 80% of the acetaldehyde in the air within 24 hours. The removal ability likely depended on the unique reaction whereby acetaldehyde and L-cysteine rapidly produce 2-methylthiazolidine-4-carboxylic acid. These results suggested that the reaction between acetaldehyde and L-cysteine has possibilities for irreversibly removing toxic acetaldehyde from indoor air. View Full-Text
Keywords: acetaldehyde; irreversibly removal; L-cysteine; bubbling method; L-cysteine-containing gel acetaldehyde; irreversibly removal; L-cysteine; bubbling method; L-cysteine-containing gel
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Yamashita, K.; Noguchi, M.; Mizukoshi, A.; Yanagisawa, Y. Acetaldehyde Removal from Indoor Air through Chemical Absorption Using L-Cysteine. Int. J. Environ. Res. Public Health 2010, 7, 3489-3498.

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