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    ZL-DHP lignin model compound at the air-water interface

    Year: 2002

    Journal: Biophysical Chemistry 99 (2002) 55-62, 20111221

    Authors: Miodrag Micic, Jhony Orbulescu, Ksenija Radotic, Milorad Jeremic, Guodong Sui, Yujun Zheng, Roger M. Leblanc

    Organizations: aCenter for Supramolecular Science and Center for Advanced Microscopy, Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, FL 33146, USA bCenter For Multidisciplinary Studies, University of Belgrade, Slobodana Penezica 35yIV, P.O. Box 373, Belgrade, Yu-11001, Serbia, Yugoslavia cFaculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade, Yu-11001, Serbia, Yugoslavia

    In this paper we present our surface chemistry studies of enzymatically polymerized, poly-coniferyl alcohol lignin model compound (dehydrogenate polymer a.k.a. ZL-DHP) at the air-water interface. Using the CHCl3/MeOH (5:1 v/v) spreading solvent, we found an average molecular area of ZL-DHP of approximately 1200 Å2. The monolayer expresses a high compressibility with a collapsed area of 500 Å2 and collapsed surface pressure of 28 mN m-1. In the range of applied surface pressures, ZL-DHP polymer have no phase changes, as shown by the very high linearity (R=0.994) of absorbance vs. surface pressure cure. There was no symmetry transitions observed as shown by absence of shifts of absorption peak maximums.