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Damages of cotton by fungi were studied by conventional methods : observation of propagation of fungi and measurements of tensile strength of damaged cotton. The effect of fungi on cotton at molecular level was also examined by DTA. Results are summarized as follows.<BR>Damages of cotton by fungi were dependent on the culture conditions. When the culture medium was free from nutritive substances, cotton sustained a great damage by fungi having cellulase (<I>Chaetomium globosum</I>) or fungi capable of getting into inner parts of fabrics (<I>Aspergillus fumigatus</I>). In a medium containing starch and saccharose, cotton was brought to degradation by acid which was formed by oxidative fermentation of fungi. It is likely that the amorphous resion of cellulose fiber is hydrolyzed by acid produced and the degree of polymerization of cellulose is decreased.<BR>Resin-finishing on cotton produced a resistant ability to fungi though its effect was dependent on the kind of fungi and the kind of resin. Formaldehyde liberated from the resin was fungicidal against <I>Aspergillus niger</I>. While <I>Aspergillus niger</I> was apt to propagate in cotton treated with less-formaldehyde resin or with non-formaldehyde resin, <I>Chaetomium globosum</I> and <I>Aspergillus fumigatus</I> were apt to propagate in cotton treated with formaldehyde resin. Even in the case of resin-finished cotton, acid produced by fungi (<I>Aspergillus niger</I>) catalyzed the hydrolysis of linkage-structure in cotton.
- 一般社団法人 日本家政学会の論文
一般社団法人 日本家政学会 | 論文
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