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Kemične spremembe melanina povzročene z glivami bele trohnobe in ligninolitičnimi encimi : diplomsko delo (univerzitetni študij) = Chemical modification of melanin caused by white rot fungi and ligninolytic enzymes : graduation thesis (university studies)Šilc, FrancMelanin je naraven polimer, ki ga v določenih pogojih sisntetizirajo glive plesni. Melaninski madeži, predvsem na dragocenih lesenih predmetih in na različnih materialih, predstavljajo estetsko ... napako. Selektivna razgradnja melanina je kemijsko podobna razkroju lignina z ektoencimi lesnih gliv. Ugotovljali smo možnost, da bi z encimskimi postopki odstranili melaninske madeže, ki jih na celuloznem materialu povzročajo glive plesni. Ekstracelularni melanin glive Cladosporium resinae smo poskusali modificirati ali celo razgraditi z glivami bele trohnobe in njihovimi izoliranimi ekstracelularnimi encimi, mangan peroksidazo in lakaze z mediatorjem. Razgradnjo melanina smo preverjali tako, da smo melanin izpostavili neposrednemu delovanju gliv bele trohnobe z uporabo naprstnikov iz steklenih vlaken. Pri poskusih z MnP smo melanin izpostavili encimskim ekstraktom različnih gliv bele trohnobe in različnim koncentracijam vodikovega peroksida. Kot mediator pri lakazi smo uporabili 1-hidroksibenzotriazol (HBT). Poskus z lakazo smo opravili tudi pri povišanem zračnem tlaku. Kemične spremembe melanina smo opazovali s FTIR spektroskopijo. Ugotovili smo, da je prišlo do kemičnih sprememb melanina, ne glede na postopek izpostavitve (obdelave z glivami ali izoliranimi encimi). Melanin se je modificiral (oksidiral) ali pa depolimeriziral. Stopnja modifikacije pa je bila odvisna od postopka obdelave. Najintenzivnejše spremembe melanina smo ugotovili z lakazo in mediatorjem HBT pri povišanem zračnem tlaku.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [F. Šilc], 2004Language - slovenianCOBISS.SI-ID - 1211529
Author
Šilc, Franc
Other authors
Pohleven, Franc |
Tavzes, Črtomir |
Petrič, Marko, 1962-
Topics
melanin |
glive bele trohnobe |
mangan peroksidaza |
lakaza |
nihajna spektroskopija FTIR |
melanin |
white rot fungi |
manganese peroxidase |
lignin peroxidase |
laccase |
FTIR spectroscopy
Library | Call number – location, accession no. ... | Copy status |
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BF, Dept. of Wood Technology, Lj. | Knjižnica BF za lesarstvo dn 794 IN: 020040117 |
available - reading room |
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Šilc, Franc | |
Pohleven, Franc | 05248 |
Tavzes, Črtomir | 19719 |
Petrič, Marko, 1962- | 00395 |
Source: Personal bibliographies
and: SICRIS
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