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Pregled bibliografske jedinice broj: 653691

Zbornik radova

Autori: Vokić, Denis; Berovič, Marin
Naslov: Use of lipase to remove oil-based overpaint
Izvornik: ICOM-CC 14th Trienal Meeting Preprints, Volume 2 / Isabelle Verger (ur.). - London : James & James / Earthscan , 2005. 862-868 (ISBN: 1-84407-253-3).
Skup: ICOM-CC 14th Trienal Meeting The Hague 12-16 September 2005
Mjesto i datum: Haag, Nizozemska, 12-16 rujna 2005
Ključne riječi: lipase; enzyme; overpaint; polychromy; removal; cleaning
Sažetak:
In this case study, excellent results were obtained for the removal of oil-based overpaints using lipase L 0763 Type XII® (Sigma) applied as an aqueous gel. The penetration of gel components was reduced by using a relatively thick gel (5 per cent Klucel G® (Hercules)) and by avoiding the use of tensides in the gel mixture. Surface wetting was achieved by a pretreatment of the overpaint. Gel buffering to pH 7.7 was balanced without use of acids. A warm buffered gel softens the oil overpaint, however, in this case insufficiently to enable quality cleaning and much less efficiently than the same gel after the addition of enzymes. The maintenance of the optimal activity temperature of the applied enzyme gel proved to be neither convenient nor desirable (at 39 °C the gel becomes dried, humidity penetrates, temperature oscillates, and so on). Far better results were obtained with an optimal activity pH and without heating.
Vrsta sudjelovanja: Predavanje
Vrsta prezentacije u zborniku: Ostalo
Vrsta recenzije: Međunarodna recenzija
Izvorni jezik: ENG
Kategorija: Znanstveni
Znanstvena područja:
Znanost o umjetnosti
Upisao u CROSBI: Denis Vokić (dvokic@unidu.hr), 11. Stu. 2013. u 23:06 sati



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