• 고문화
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• 66호
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• pp.87-112
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• 2005

Stain removal on ivory has been, for a long time, considered an undesirable treatment in conservation field because ivory is hygroscopic and anisotropic, having different physical properties in different directions. Cyclododecane, which sublimes at room temperature, has been investigated for its use in conservation field since 1995, as a reversible temporary consolidant, sealing agent or coating, water repellent, and barrier layer. This research aims to remove stains on ivory, temporarily protecting the none-stained area or painted area from methanol, acetone or the aqueous cleaning system using cyclododecane as a hydrophobic sealing agent. This research also aims to obtain information regarding whether cyclododecane can be safely and effectively used on archaeological wet ivory. Melted cyclododecane and saturated solutions of cyclododecane in mineral spirits, and hexanes were applied to ivory samples. Application methods, working properties of cyclododecane on ivory, and effect of cyclododecane coating on moisture content of wet ivory were evaluated. The sealing layer formed by molten cyclododecane or by saturated cyclododecane solution in hexane or saturated cyclododecane solution in mineral spirits did not form a secure contact with the surface of the highly polished ivory. The sealing formed with two different layers, in which saturated cyclododecane solution in hexane was applied initially and then molten cyclododecane was applied over the first layer, was found to securely protect the painted area. When the wet samples were kept in 100% RH environments for a month, active mold growths were observed except in the samples sealed with molten cyclododecane. In conclusion, cyclododecane was an efficient hydrophobic sealing agent to protect painting area while cleaning stains on ivory. It also prevented mold growing on wet ivory and wet bone. Evenness of cyclododecane film on ivory will be determined in UV light. Analytical techniques will include visual observation, polarized light microscopy, Scanning Electron Microscope, and Gas Chromatography.

• 보존과학회지
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• 제31권4호
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• pp.351-360
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• 2015

본 논문은 석조문화재 해체과정에서 발생할 수 있는 표면 손상부분 보강방안 마련을 위해 승화성 강화처리제인 시클로도데칸을 사용한 임시 강화처리제를 연구한 결과이다. 기존 발포성 우레탄 폼을 사용한 보강방법의 단점을 보완하기 위해 시클로도데칸을 용제에 희석하여 표면 및 박리 내부를 보강하여 부재를 해체한 후 $60^{\circ}C$ 내외의 열을 가해 승화시키는 처리방법에 관한 것이다. 이와 같은 방법은 시클로도데칸이 전량 승화되는 뛰어난 가역성과 손상된 표면의 보강과 강화에 필요한 강도를 담보할 수 있다는 장점이 있으나, 용제에 따라 효과가 다를 수 있으므로 본 연구에서는 석유에테르에 희석하는 방법 또는 중탕하여 적용하는 방법에 대한 연구를 진행하였다. 실험결과 현장에서의 작업여건을 고려하여 박리부분 주입 및 충전은 석유에테르 중탕 방법, 표면 도포는 석유에테르에 희석한 시클로도데칸으로 임시 강화처리하는 것이 가장 적합할 것으로 확인되었다.

• Bulletin of the Korean Chemical Society
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• 제21권3호
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• pp.353-354
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• 2000

• The Plant Pathology Journal
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• 제26권1호
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• pp.57-62
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• 2010

Low-molecular-weight secondary metabolites from plants play an important role in reproductive processes and in the defense against environmental stresses or pathogens. In the present study, we isolated various volatiles and phenolic compounds from white Rosa rugosa flowers, and evaluated the pharmaceutical activities of these natural products in addition to their ability to increase survival in response to environmental stress and pathogen invasion. The DPPH and hydroxyl radical-mediated oxidation assay revealed that the white rose flower extract (WRFE) strongly scavenged free radicals in a dose dependent manner. Moreover, WRFE inhibited the growth of E. coli and fatally attacked those cells at higher concentration (>0.5 mg/mL). FITC-conjugated Annexin V stain provided further evidence that WRFE had strong antimicrobial activity, which may have resulted from a cooperative synergism between volatiles (e.g. 1-butanol, dodecyl acrylate and cyclododecane) and phenolic compounds (e.g. gallic acid) retained in WRFE. In conclusion, secondary metabolites from white rose flower hold promise as a potential natural source for antimicrobial and non-chemical based antioxidant agents.