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Dust-proofing effects of filter membrane treated with chitosan hydrolysates CTSN-B2. The filter surfaces were observed by microscopic analysis (at magnifications of ×40, ×100 and ×200). Observations are as follows: (a–c) the filter surface without treatment (time zero) as control; (d–f) the filter surface after passing air into the chamber for 10 min; (g–i) the filter surface treated with CTSN-B2 after passing air into the chamber for 10 min.
