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SUMMARY:HIERARCHICAL ARCHITECTURE OF CELLULOSE AND ITS INTERACTION WITH OT
 HER PLANT CELL WALL POLYSACCHARIDES
DTSTART;VALUE=DATE-TIME:20181120T011000Z
DTEND;VALUE=DATE-TIME:20181120T013000Z
DTSTAMP;VALUE=DATE-TIME:20260613T181256Z
UID:indico-contribution-2347@events01.synchrotron.org.au
DESCRIPTION:Speakers: Elliot Gilbert (ANSTO)\nPlant cell walls (PCWs) are 
 extremely complex structures in which cellulose microfibrils are hierarchi
 cally assembled and embedded in a multi-component matrix. While the cellul
 ose microfibrils represent the basic building unit providing mechanical st
 rength [1]\, the matrix components are able to tune the properties of each
  specific tissue [2-3]\, increasing the flexibility or limiting the transp
 ort of moisture\, for instance.\n\nThe synthesis of cellulose hydrogels by
  means of bacterial fermentation is an efficient approach to mimic the cel
 l wall biosynthesis process and investigate the interactions established b
 etween cellulose and matrix polysaccharides by incorporating the latter in
 to the culture medium. We have characterised cellulose hydrogels and their
  composites with PCW polysaccharides by means of SANS and SAXS\, combined 
 with complementary techniques such as X-ray diffraction\, spectroscopy and
  microscopy. Furthermore\, the production of partially deuterated cellulos
 e hydrogels by using a deuterated glucose-based feedstock is presented as 
 a strategy to enhance the neutron scattering length density contrast [4].\
 n\nThe application of a multi-technique characterisation approach enabled 
 elucidation of the complex hierarchical architecture of cellulose hydrogel
 s and led to the development of a multi-scale model based on core-shell st
 ructures [4-8]. The model describes the multi-phase structure of cellulose
  microfibrils and ribbons\, as well as the essential role of water at the 
 different structural levels. In addition\, USANS experiments are presented
  as a promising method to characterise the structure of native cellulose i
 n the longitudinal direction\, providing information on the microfibril le
 ngth and ribbon twisting periodicity.\n\nPCW polysaccharides such as xylog
 lucan\, arabinoxylan\, mixed linkage glucans and pectins during cellulose 
 synthesis have a distinct structural role and interaction mechanism with c
 ellulose (interfering with the crystallisation process and strongly intera
 cting with the cellulose microfibrils\, or establishing interactions at th
 e ribbons’ surface level).\n\nThese results highlight the ability of sma
 ll angle scattering techniques to provide valuable insights on cellulose b
 iosynthesis and interactions with PCW polysaccharides.\n\nhttps://events01
 .synchrotron.org.au/event/84/contributions/2347/
LOCATION:AINSE Conference Centre New Illawarra Road Lucas Heights NSW 2234
  Australia
URL:https://events01.synchrotron.org.au/event/84/contributions/2347/
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