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( Hiroshi Tamura ),( Makoto Sawada ),( Seiichi Tokura ) 한국키틴키토산학회 2003 한국키틴키토산학회지 Vol.8 No.4
N/A The crystalline structure of chitosan fiber has been investigated to become chitin type crystalline structure by the increment of the degree of N-acetylation applting acetic angydrede in aqueous methanol. The critical degree of N- acetylation to maintain chitosan type crystalline structure was shown to be about 44% of the N-acetylation and to be converted to chitin type when the degree of N-acetylation of chitosan reached to 525. The fiber of chitosan type crystalline structure was also found to solvent system for chitin, even when degree of N-acetylation was around 44%, This conversion woule suggest following morphological composition of N- acetyl glucosamine residues that there is block of N-acetylated glucosamine residues among random distribution of glucosamine residues in chitosan molecule.
A Mismatch hybridization of α-Chitin Gel with β-Chitin Gel on the Preparation of Non-woven Fabrics
( Hiroshi Tamura ),( Serika Koiwa ),( Shinobu Okazaki ),( Seiichi Tokura ) 한국키틴키토산학회 2003 한국키틴키토산학회지 Vol.8 No.4
N/A Both α-chitin from Crab or Shrimp shells and β-chitin from squid pen were found to dissolve in calcium chloride dihydrate saturated methanol (chitin solvent) and regenerated to α-chitin type non-woven fabrics applying chitin hydrogel which was prepared by precipitation with addition of large excess of water to chitin solution. But β-chitin type no-woven fabrics was obtained from β-chitin slurry which was prepared by repeated mechanical agitation of β-chitin powder in limited amount of water followed by filtration of chitin slurry. Though the high tensile strengths were shown by each type of non-woven fabrics, low tensile property was shown by mixed type non-woven fabrics (α-chitin hydrogel+β-chitin hydrogel) probably due to mismatching of both polysaccharide molecule on th hybridyzation to form no-woven fabrics.
Daisuke Ide,Tomohiko Richard Ohya,Mitsuaki Ishioka,Yuri Enomoto,Eisuke Nakao,Yuki Mitsuyoshi,Junki Tokura,Keigo Suzuki,Seiichi Yakabi,Chihiro Yasue,Akiko Chino,Masahiro Igarashi,Akio Nakashima,Masayuk 대한소화기내시경학회 2022 Clinical Endoscopy Vol.55 No.5
Background/Aims: Endoscopic submucosal dissection (ESD) for residual or recurrent colorectal lesions after incomplete resection is challenging because of severe fibrosis. This study aimed to compare the efficacy of the pocket-creation method (PCM) with a traction device (TD) with that of conventional ESD for residual or recurrent colorectal lesions. Methods: We retrospectively studied 72 patients with residual or recurrent colorectal lesions resected using ESD. Overall, 31 and 41 le- sions were resected using PCM with TD and conventional ESD methods, respectively. We compared patient background and treatment outcomes between the PCM with TD and conventional ESD groups, respectively. The primary endpoints were en bloc resection and R0 resection rates. The secondary endpoints were the dissection speed and incidence of adverse events. Results: En bloc resection was feasible in all cases with PCM with TD, but failed in 22% of cases of conventional ESD. The R0 resection rates for PCM with TD and conventional ESD were 97% and 66%, respectively. Dissection was significantly faster in the PCM with TD group (13.0 vs. 7.9 mm2/min). Perforation and postoperative bleeding were observed in one patient in each group. Conclusions: PCM with TD is an effective method for treating residual or recurrent colorectal lesions after incomplete resection.