
The object of this paper is to study the ability of four white-rot fungi (Trametes versicolor, Hypoxylon fragiforme, Chondrostereum purpureum, and Pleurotus ostreatus) and one brown-rot fungus (Gloeophyllum trabeum) to degrade the organochlorine insecticide lindane in liquid cultures. The evaluation of lindane biodegradation was performed using two analytical procedures. In order to extract and properly quantify the remaining lindane from fungal liquid cultures, two different extraction procedures were used: extraction from filtrates and extraction from homogenized fungal cultures. White-rot fungi were able to degrade lindane. The amount of degraded lindane increased with its exposure period in the liquid cultures of all white-rot fungi used, except C. purpureum. After 21 days of exposure, over 90 % of lindane was degraded by T. versicolor, H. fragiforme, and P. ostreatus. Degradation of lindane by the brown rot G. trabeum did not occur. The extraction procedures, when liquid cultures of T. versicolor, H. fragiforme, and P. ostreatus were used, had no noticeable effect on the determined degradation after 21 days of exposure. On the other hand, the amount of remaining lindane in liquid cultures of C. purpureum and G. trabeum depended strongly on the extraction procedure. Our study indicates that mycoremediation studies of lindane should also consider adsorption onto mycelial biomass as a possible reason for the removal of the insecticide from the liquid medium, especially where shorter exposure periods are studied or fungi with poorer degradation potentials are used.
U radu se prikazuje istraživanje sposobnosti četiriju gljiva bijele truleži (Trametes versicolor, Hypoxylon fragiforme, Chondrostereum purpureum i Pleurotus ostreatus) te jedne gljive smeđe truleži (Gloeophyllum trabeum) za razgradnju organoklorova insekticida lindana u tekućim kulturama. Procjena biorazgradnje lindana izvedena je uz pomoću dvaju analitičkih postupaka. Kako bi se izdvojio i pravilno kvantifi cirao preostali lindan u tekućim kulturama gljiva, primijenjena su dva različita ekstrakcijska postupka: ekstrakcija iz filtrata i ekstrakcija iz homogenizirane kulture gljiva. Dokazano je da su gljive bijele truleži razgradile lindan. Količina razgrađenog lindana povećava se s trajanjem izlaganja u tekućim kulturama svih gljiva bijele truleži, osim gljive C. purpureum. Nakon 21 dan izloženosti gljivama T. versicolor, H. fragiforme i P. ostreatus više od 90 % lindana bilo je razgrađeno. Razgradnje lindana od gljive smeđe truleži G. trabeum nije bilo. Postupak ekstrakcije imao je zamjetan učinak na razgradnju nakon 21 dan izlaganja tekućoj kulturi gljiva T. versicolor, H. fragiforme i P. ostreatus. Nasuprot tome, količina preostalog lindana u tekućim kulturama gljiva C. purpureum i G. trabeum znatno ovisi o postupku ekstrakcije. Ovaj rad pokazuje da bi se u istraživanju mikorazgradnje lindana trebala razmotriti i adsorpcija na micelije biomase kao mogući razlog za uklanjanje insekticida iz tekućeg medija, posebno kada se proučavaju kraća razdoblja izloženosti ili kada se koriste gljive s manjim potencijalom razgradnje.
lindane, biorazgradnja, adsorpcija, Forestry, white rot, SD1-669.5, biodegradation, lindan, adsorption, gas-chromatography, plinska kromatografija, bijela trulež
lindane, biorazgradnja, adsorpcija, Forestry, white rot, SD1-669.5, biodegradation, lindan, adsorption, gas-chromatography, plinska kromatografija, bijela trulež
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