By Marshall L. Fishman, Joseph J. Jen
content material: An advent to pectins : constitution and homes / James N. BeMiller --
Analytical equipment for settling on pectin composition / Landis W. Doner --
A severe reexamination of molecular weight and dimensions for citrus pectins / Marshall L. Fishman, L. Pepper, W.C. Damert, J.G. Phillips, and R.A. Barford --
Structural reviews of apple pectins with pectolytic enzymes / J.A. de Vries, A.G.J. Voragen, F.M. Rombouts, and W. Pilnik --
Sugar beet pectins : chemical constitution and gelation via oxidative coupling / F.M. Rombouts and J.F. Thibault --
Interactions of counteroins with pectins studied by way of potentiometry and round dichroism / J.F. Thibault and M. Rinaudo --
Ionic results at the conformation, equilibrium, homes, and rheology of pectate in aqueous recommendations and gels / S. Paoletti, A. Cesaro, F. Delben, and A. Ciana --
Pectin inner gel energy : conception, size, and technique / Philip G. Crandall and Louise Wicker --
Characterization of pectins / P. seashore, E. Davis, P. Ikkala, and M. Lundbye --
Synergistic gelation of alginates and pectins / Knut Toft, Hans Grasdalen, and Olav Smidsrød --
keep watch over of pectin synthesis and deposition in the course of plant cellphone wall development / D.H. Northcote --
Comparative research of pectins from pericarp and locular gel in constructing tomato fruit / Donald J. Huber and James H. Lee --
Polygalacturonases in greater crops / Russell Pressey --
Paramagnetic ion spin-spin coupling as direct facts for cooperative ion binding to raised plant phone partitions / Peter L. Irwin, Michael D. Sevilla, James J. Shieh, and Carla L. Stoudt --
Softening of cooked snap beans and different greens with regards to pectins and salts / Jerome P. Van Buren --
results of freezing and frozen garage at the features of pectin extracted from cellphone partitions / D.S. Reid, J.M. Carr, T. Sajjaanantakul, and J.M. Labavitch --
Pectin methylation alterations and calcium ion results at the texture of clean, fermented, and acidified cucumbers / Roger F. McFeeters --
Enzymic lysis of pectic elements in phone partitions : a few implications for fruit juice know-how --
A.G.J. Voragen, H.A. Schols, H.A.I. Siliha, and W. Pilnik --
results of pectin on human metabolism / Kay Behall and Sheldon Reiser --
position of pectin in binding of bile acids to carrot fiber / Peter D. Hoagland and Philip E. Pfeffer.
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Extra info for Chemistry and Function of Pectins
ACS Symposium Series; American Chemical Society: Washington, DC, 1986. FISH MAN ET AL. Molecular Weight and Dimensions for Citrus Pectins CONCENTRATION (g/dl) Figure 1. van't Hoff p l o t s demonstrating concentration dependence of pectin d i s s o c i a t i o n . Values a t intercept calculated from end group t i t r a t i o n s . PARTITION COEFFICIENT Figure 2. 1M NaCl mobile phase. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1986. 28 CHEMISTRY AND FUNCTION OF PECTINS two classes of polysaccharides without f r a c t i o n a t i n g the commer c i a l l y available and r e l a t i v e l y inexpensive dextran standards (11).
1 M. I f one assumes a r o d - l i k e model f o r pectin i t i s r e a d i l y shown (12) that the degree of polymerization DP i s related to R (7) by equation 7. R = DP χ h / VÎ2 g g Here h i s the v i r t u a l bond length, the length of a monomer unit projected along the χ a x i s , provided the p e c t i n rod i s p a r a l l e l to that axis. I f one replaced DP with the r a t i o of polymer molecular weight M to monomer residue weight, M , equation 8 i s obtained. q R = Μ χ h / VÏ2 χ g M (8) Q Substituting equation 8 into equation 4, y i e l d s equation 9.
The d i f f e r e n c e s b e tween c a l c u l a t e d and e x p e r i m e n t a l d a t a were found t o be r e l a t i v e l y small. The e f f e c t o f d i f f e r e n t i n t r a m o l e c u l a r d i s t r i b u t i o n s o f methoxyl a t e d and f r e e c a r b o x y l groups on t h e d i s t r i b u t i o n o f t h e degree o f p o l y m e r i z a t i o n o f o l i g o g a l a c t u r o n i d e s i n enzymatic d i g e s t s o f p e c t i n s i s i l l u s t r a t e d i n F i g . 10. These d a t a were o b t a i n e d by s a p o n i f y i n g 95% e s t e r i f i e d p e c t i n t o 60% e s t e r i f i c a t i o n w i t h c i t r u s p e c t i n e s t e r a s e (PE, s a p o n i f i e d ) o r w i t h a l k a l i ( a l k a l i s a p o n i f i e d ) and deg r a d i n g r e s p e c t i v e l y 12% and 8% o f t h e g l y c o s i d i c l i n k a g e s o f t h e two p e c t i n s w i t h p e c t a t e l y a s e .
Chemistry and Function of Pectins by Marshall L. Fishman, Joseph J. Jen