WEKO3
アイテム
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Several kinds of red agars in Japan are classified as funori species and they are commercially distributed as “dried funori” after being harvested, dried, and bleached under sunlight with small amounts of bleaching agents. “Dried funori” is extracted with water and heat; after that, it is used as a facing adhesive because of its high water-solubility, and as a thickener. Current researches clarified that its viscosity changes depending on extracting condition, temperature, water hardness, species and other factors. While these facts make characteristics of extracts easy to control, molds tend to generate at areas where funori is used. It is an issue when Japanese conservators use funori.\nThe main components of funori extracts are funorans which are composed of sulphated agaroid chains and sulphated carrageenan chains. The ratio and structures of those polysaccharides are different in each species, and it is difficult for both agaroid and carrageenan to be degraded by microorganisms. On the other hand, it has been clarified that funori extract includes impurities, for example polypeptides which are easy to be degraded by microorganisms. Therefore, it was supposed possible to prevent from mold generation on the funori-applied areas by removing impurities in this research. The effects of funori purification were considered with two samples prepared in the laboratory by different methods and two commercial purified funori.\nThe evaluation was conducted by mold susceptibility test, gel filtration chromatography (GFC), and FT-IR. In the results of the mold susceptibility test, all samples kept under the condition without water vapors showed no mold; on the other hand, samples kept under the condition with water vapors showed various results. While two commercial products did not show any mold generation, the sample purified with reprecipitation showed mold generation significantly, and the sample purified with activated carbon showed some mold generation. In the results of GFC, the sample without TRI-funori showed only one peak under 10×103 molecular weight area. It is thought that there are two reason for this result; one is a fraction had been removed by purification, based on the fact that normal funori showed two peaks in the area according to previous research, and the other is that it was caused by differences in raw materials. In FT-IR results, the absorption band identified amid II was shown in only the sample purified with reprecipitation and unpurified sample. It seemed that the result was correspondent with the result of the mold susceptibility test. Based on these results, purification with reprecipitation has insufficient effects on funori to prevent mold generation. 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〔報告〕文化財修復に使用されるフノリの精製効果に関する評価
https://tobunken.repo.nii.ac.jp/records/9157
https://tobunken.repo.nii.ac.jp/records/91579fd1d155-917e-4b11-8683-aef0aac2e6a9
名前 / ファイル | ライセンス | アクション |
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06106 (2.3 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2022-04-13 | |||||
タイトル | ||||||
タイトル | 〔報告〕文化財修復に使用されるフノリの精製効果に関する評価 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Evaluation of the Effect of Purification on Characteristics and Mold Susceptibility of Funori | |||||
言語 | ||||||
言語 | jpn | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
早川, 典子
× 早川, 典子× 金, 旻貞× 柏谷, 明美× HAYAKAWA, Noriko× KIM, Minjung× KASHIWAYA, Akemi |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Funori is a traditional material used for conservation treatments and production of traditional craft objects for over a thousand years. Several kinds of red agars in Japan are classified as funori species and they are commercially distributed as “dried funori” after being harvested, dried, and bleached under sunlight with small amounts of bleaching agents. “Dried funori” is extracted with water and heat; after that, it is used as a facing adhesive because of its high water-solubility, and as a thickener. Current researches clarified that its viscosity changes depending on extracting condition, temperature, water hardness, species and other factors. While these facts make characteristics of extracts easy to control, molds tend to generate at areas where funori is used. It is an issue when Japanese conservators use funori. The main components of funori extracts are funorans which are composed of sulphated agaroid chains and sulphated carrageenan chains. The ratio and structures of those polysaccharides are different in each species, and it is difficult for both agaroid and carrageenan to be degraded by microorganisms. On the other hand, it has been clarified that funori extract includes impurities, for example polypeptides which are easy to be degraded by microorganisms. Therefore, it was supposed possible to prevent from mold generation on the funori-applied areas by removing impurities in this research. The effects of funori purification were considered with two samples prepared in the laboratory by different methods and two commercial purified funori. The evaluation was conducted by mold susceptibility test, gel filtration chromatography (GFC), and FT-IR. In the results of the mold susceptibility test, all samples kept under the condition without water vapors showed no mold; on the other hand, samples kept under the condition with water vapors showed various results. While two commercial products did not show any mold generation, the sample purified with reprecipitation showed mold generation significantly, and the sample purified with activated carbon showed some mold generation. In the results of GFC, the sample without TRI-funori showed only one peak under 10×103 molecular weight area. It is thought that there are two reason for this result; one is a fraction had been removed by purification, based on the fact that normal funori showed two peaks in the area according to previous research, and the other is that it was caused by differences in raw materials. In FT-IR results, the absorption band identified amid II was shown in only the sample purified with reprecipitation and unpurified sample. It seemed that the result was correspondent with the result of the mold susceptibility test. Based on these results, purification with reprecipitation has insufficient effects on funori to prevent mold generation. It was also considered that the funori extracted at 20℃ possessed lower mold susceptibility than the sample extracted with heating as was mentioned in a previous paper. |
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書誌情報 |
保存科学 en : Science for Conservation 号 61, p. 67-77, 発行日 2022-03-17 |
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出版者 | ||||||
出版者 | 独立行政法人国立文化財機構 東京文化財研究所 |