Weight‐Average and z‐Average Degree of Polymerization for Polymers Undergoing Random Scission

1963 ◽  
Vol 38 (5) ◽  
pp. 1174-1178 ◽  
Author(s):  
Mitio Inokuti
Keyword(s):  
Degree Of Polymerization ◽  
Average Degree ◽  
Random Scission

Combined Implementation of Dynamic Rating-based Protection and Calculating the Average Degree of Polymerization for Power Transformers

2021 ◽  
Vol 141 (7) ◽  
pp. 528-534
Author(s):  
Kohei Ito ◽  
Mutsumi Aoki ◽  
Toru Amau ◽  
Tetsuo Otani ◽  
Tatsuya Ozawa ◽  
...  
Keyword(s):  
Degree Of Polymerization ◽  
Average Degree ◽  
Power Transformers

scholarly journals Extraction and Characterization of Inulin-Type Fructans from Artichoke Wastes and Their Effect on the Growth of Intestinal Bacteria Associated with Health

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Zahraa Zeaiter ◽  
Maria Elena Regonesi ◽  
Sofia Cavini ◽  
Massimo Labra ◽  
Guido Sello ◽  
...  
Keyword(s):  
Intestinal Bacteria ◽  
Degree Of Polymerization ◽  
Average Degree ◽  
Globe Artichoke ◽  
Ethanol Precipitation ◽  
Long Chain ◽  
Simpler Method

Globe artichoke is an intriguing source of indigestible sugar polymers such as inulin-type fructans. In this study, the effect of ultrasound in combination with ethanol precipitation to enhance the extraction of long chain fructans from artichoke wastes has been evaluated. The inulin-type fructans content both from bracts and stems was measured using an enzymatic fructanase-based assay, while its average degree of polymerization (DP) was determined by HPLC-RID analysis. Results show that this method provides artichoke extracts with an inulin-type fructans content of 70% with an average DP between 32 and 42 both in bracts and in stems. The prebiotic effect of long chain inulins from artichoke extract wastes was demonstrated by its ability to support the growth of five Lactobacillus and four Bifidobacterium species, previously characterized as probiotics. Besides, we considered the possibility to industrialize the process developing a simpler method for the production of inulin-type fructans from the artichoke wastes so that the artichoke inulin preparation could be suitable for its use in synbiotic formulations in combination with different probiotics for further studies including in vivo trials.

THE MECHANISM OF DEGRADATION OF A CELLODEXTRIN BY MYROTHECIUM CELLULASE

1956 ◽  
Vol 34 (1) ◽  
pp. 488-494 ◽  
Author(s):  
D. R. Whitaker
Keyword(s):  
Degree Of Polymerization ◽  
Average Degree ◽  
Transfer Reactions ◽  
Mechanism Of Degradation ◽  
Specific Activities

A cellodextrin with a number-average degree of polymerization (D.P.) of 24 was hydrolyzed by Myrothecium cellulase in the presence of C14-labelled cellobiose. The specific activities of cellotriose and cellotetraose isolated at various stages of the hydrolysis were less than 20% of that of cellobiose isolated at the same time. It is concluded that transfer reactions involving cellobiose contributed little to the formation of cellotriose and cellotetraose. The ratio moles of cellotriose formed/mole of cellobiose formed was at least 0.7 and the corresponding ratio for cellotetraose at least 0.4. The number-average D.P. of the substrate decreased slightly during the hydrolysis. The results exclude a degradation of the substrate by cleavage of cellobiose units from the ends of its chains but are consistent with degradation by random cleavage.

Chain conformation and average degree of polymerization of the sequences in copolyesters

1989 ◽  
Vol 156-157 ◽  
pp. 420-422 ◽  
Author(s):  
E. Olbrich ◽  
D. Chen ◽  
P. Lindner ◽  
H.G. Zachmann ◽  
H. Benoit
Keyword(s):  
Degree Of Polymerization ◽  
Chain Conformation ◽  
Average Degree

A Simple and Accurate Method for Determining Wheat Grain Fructan Content and Average Degree of Polymerization

2012 ◽  
Vol 60 (9) ◽  
pp. 2102-2107 ◽  
Author(s):  
Joran Verspreet ◽  
Annick Pollet ◽  
Sven Cuyvers ◽  
Rudy Vergauwen ◽  
Wim Van den Ende ◽  
...  
Keyword(s):  
Accurate Method ◽  
Degree Of Polymerization ◽  
Average Degree ◽  
Wheat Grain

Characteristics of Cellulose from Lespedeza stalks Steam Pretreated with Low Severity Steam and Post-Treatment by Alkaline Peroxide for Energy Production

2012 ◽  
Vol 578 ◽  
pp. 30-34
Author(s):  
Yang Xing ◽  
Lv Yang Liu ◽  
Zhao Qin Su ◽  
Li Wei Zhu ◽  
Jian Xin Jiang
Keyword(s):  
Degree Of Polymerization ◽  
Average Degree ◽  
Post Treatment ◽  
Raw Material ◽  
Steam Pretreatment ◽  
Material Synthesis ◽  
Glucose Yield ◽  
Alkaline Peroxide ◽  
Pre Treatment ◽  
Lespedeza Stalks

Lespedeza crytobotrya is a shrub species with properties of substantial biomass and widely distributes in the desert region of China. The cellulose separated from Lespedeza after pre-treatment can be enzymatic hydrolyzed into glucose for ethanol or other chemicals production, which are important renewable fuels or raw material for other material synthesis. Moreover it also can be used for cellulosic material production. So it is necessary to evaluate the cellulose of Lespedeza crytobotrya before its utilization. In this study four cellulosic fractions were isolated by pretreatment with low severity steam and post-treatment with alkaline peroxide. They were comparatively studied by sugar analysis and the average degree of polymerization. After alkaline peroxide post-treatment, the hemicelluloses in the cellulosic fractions were removed markedly. The treatment intensity had a profound effect on the average degree of polymerization, which was increased firstly and then decreased. A combination of low severity steam pretreatment and alkaline peroxide post-treatment is an effective method for Lespedeza stalks to obtain high glucose yield.

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