Degree of polymerization, calculation

Average degrees of polymerization calculated from results of acid hydrolysis of dried precipitated dextrins that remained after removal of fermentable sugars. 

It is important to monitor the time that the proanthocyanidin is allowed to react with the phloroglucinol solution. The products formed are not stable under acidic conditions, and it is therefore critically important that the reaction not exceed 20 min. Of particular concern are the flavan-3-ol monomers, which degrade more rapidly than the phloroglucinol adducts (Kennedy and Jones, 2001). Excessive degradation of the flavan-3-ol monomers will result in reduced amount of terminal subunits. This in turn will reduce the conversion yield and increase the average degree of polymerization calculated. 

The average degree of polymerization calculated from DP = 7.4 z] "Calculated from (A. chain length — [chain length X beta-amylolytic index + 25]). 

Theoretical and experimentally determined volume fraction of PLA Total molecular weight determined by NMR and poly(styrene) calibrated SEC Total degree of polymerization calculated using the NMR data... 

Figure 8-2. The mole fraction x —) or mass fraction w --) as a function of the degree of polymerization X fora Gaussian molar differential distribution of the degree of polymerization. Calculations based on = 3170 and Xn = 3000.

Pn = Average degree of polymerization calculated from number average molar mass... 

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