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New controlled release systems produced by self-assembly of biopolymers and colloidal particles at fluid-fluid interfaces
Galactomannans isolated from legume seed endosperms, including those of commercial interest, have been characterized by multidetection aqueous SEC. Galactomannans derived from seeds of the Faboideae subfamily had substantially higher M-w than those from Caesalpinioideae seeds (M-w,M-Fab = 2.4-3.1 x 10(6) g/ mol, M-w,M-Caes.=0.86-2.1 x 10(6) g/mol) and within the latter botanical subfamily, an apparent correlation between M-w and the degree of galactose substitution DG was found. The molar mass distributions were unimodal and differed primarily by a scale factor, with distributional widths narrower than a true Flory 'most-probable distribution'; good fits to Schulz-Zimm model were obtained. Across subfamilies no differences were found in the exponents of [eta]-M and R-v-M relationships (0.61 +/- 0.02, 0.54 +/- 0.01, respectively), the Flory chain stiffness ratio (C-infinity = 20 +/- 1 (BSF analysis)), or the persistence length (L-p=5.5 +/- 0.2 nm) obtained from SEC fraction data. However, it was found that prefactors in the [eta]-M and R-v-M relationships as well as the unperturbed parameter K-circle dot decrease in proportion to DG and therefore chain density. Generalized relationships incorporating galactose-dependent prefactors were therefore developed to model SEC fraction data of native galactomannans ([eta](GM) = (1800 +/- 200) x M-o (-1.61) x M-0.61 +/- 0.02, R-v,R-GM = (0.63 +/- 0.05) x M-o (-0.54) x M-0.54 +/- 0.01) as well as lower-M fractions obtained by ultrasonication ([eta](GM) = (730 +/- 100) x M-o (-1.71) x M-w (0.71 +/- 0.02), R-v,R-GM = 0.49 +/- 0.05 x M-o (-0.57) x M-w (0.57 +/- 0.01), M approximate to 1 x 10(5)-native). As a consequence of this dependence and the observed patterns in molar mass variation, loll varies within a narrow range for galactomannans as a whole despite substantial M-w differences. (C) 2009 Elsevier Ltd. All rights reserved. [hide]
Scientific Board
Andreas Bausch
TU Munich, Germany ►
Peter Fischer
ETH Zurich, Switzerland ►
Anne-Marie Hermansson
SIK, Sweden ►
Martin Kroger
ETH Zurich, Germany/Switzerland ►
Erik van der Linden
Wageningen UR, The Netherlands ►
Niklas Loren
SIK, Sweden ►
Leonard Sagis
Wageningen UR, The Netherlands ►
Erich Windhab
ETH Zurich, Switzerland ►
Klaas-Jan Zuidam
Unilever, The Netherlands ►
Scientific Stuff
Manuela Duxenneuner
ETH Zurich, Switzerland ►
Sophia Fransson
SIK, Sweden ►
Nam-Phuong Humblet-Hua
Wageningen UR, The Netherlands ►
Joeska Husny
ETH Zurich, Australia/Switzerland ►
Orit Peleg
ETH Zurich, Israel/Switzerland ►
Cyrille Vezy
TU Munich, Germany ►
Varvara Mitropoulos
ETH Zurich, Switzerland ►
Associated Scientists
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SY Tee, AR Bausch, PA Janmey,
The mechanical cell
CURRENT BIOLOGY 19 (2009) R745 ►Selected conferences (co-)organized by project members
8th World Congress on Computational Mechanics WCCM8 2008
30 June - 5 July 2007, Venice, Italy ►13 May 2025
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