3/10/14 1-3,B-linked Beta Glucan Mixed linkages H.OH 0 (4.118) 学当%的】 Loosely-Jointed CH.O 人交 (4.121) 4
3/10/14 6 1-3, β-linked Beta Glucan Mixed linkages Loosely-Jointed
3/10/14 CH,OH HO HO H OH Glucose OH HO CH,OH -0 HO D-Galactose H OH Galactose OH Strongly Pleated or Ribbon Type 1.4linked a-D-galactopyranosyl-uronate unit (4.116) (4.115 7
3/10/14 7 Strongly Pleated or Ribbon Type 1,4 linked α-D-galactopyranosyl-uronate units
3/10/14 Conformations of Heteroglycans 的ences prof a sin Properties ·Fiber ·Viscosity ·Gel forming ·Films and Coating ·Energy Fig.4.15.Interchain aggregation between regular conformations.a Double helix,b double helix ·Structural bundle.e egg-box,d ribbon-ribbon,and e double helix.ribbon interaction
3/10/14 8 Conformations of Heteroglycans Properties • Fiber • Viscosity • Gel forming • Films and Coating • Energy • Structural
3/10/14 Polysaccharides Seaweed ·Agar ·Seaweed ·Alginate Carrageenans ·Plant Exudates Furcellaran ·Seed gums Plant structural material ·Microbial gums [4)-0-8-ManpA(1-4)-8-p-ManpA(1-1 ·Starch [→4-at-GulpA(1 →4-a-L-GulpA(1→] →4)-go-ManpA(1→4a-t-GulpA0→]b Plant Exudates ·Gum Arabic 人2 ·Gum Ghatti ·Gum Tragacanth ·Karaya Gum
3/10/14 9 Polysaccharides • Seaweed • Plant Exudates • Seed gums • Plant structural material • Microbial gums • Starch Seaweed • Agar • Alginate • Carrageenans • Furcellaran Problem: Alginates are heteroglycans made from β-D-mannuronic and α-L-guluronic acids join by 1-> 4 linkages. The polysaccharide is linear and consists of periods of three Distinct repeating regions as defined below A solution of alginate will gel with calcium. Draw The structures of the three regions and predict which region forms The gel with calcium cross linking. Plant Exudates • Gum Arabic • Gum Ghatti • Gum Tragacanth • Karaya Gum
3/10/14 Plant Seed Gums ·Locust Bean Gum ·Guaran Gum ·Tamarind Flour ·Arabinogalactan 0 u41 Plant Structure ·Cellulose ·Hemicellulose ·Pectin 9-Ch 三004 10
3/10/14 10 Plant Seed Gums • Locust Bean Gum • Guaran Gum • Tamarind Flour • Arabinogalactan Plant Structure • Cellulose • Hemicellulose • Pectin