A quartz crystal microbalance (QCM) used to investigate the oxidation and removal of two unsaturated fatty acids, linoleic acid and glycerol trioleate as well as wood extractives from a soft surface (nanofibrilated cellulose, NFC) and a hard surface (polyethylene terephthalate, PET). The effect of temperature, thickness of the soiling lipid layer, soaking conditions, enzyme concentration and available oxygen was elucidated as far as the enzyme activity. The results indicate that lipophilic lipids that have been oxidized have less affinity to NFC and PET. Also, the rate of oxidation depends on the type of soil and the aqueous medium pH. Surface plasmon resonance (SPR) was used to confirm the oxidation effect of enzyme in aqueous solution. Finally FTIR was employed to monitor the changes in lipid structure and number of carbon double bonds upon enzyme treatment. The obtained results can be used for applications in papermaking, as a viable solution to deposit problems and for fiber surface modification.

QCM/SPR to study the oxidation and removal of unsaturated fatty acids from NFC and PET surfaces by lipooxygenase treatment

249th National Meeting (2015)

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