✦ LIBER ✦

Molecular weight distribution of cellulose as its tricarbanilate by high performance size exclusion chromatography

✍ Scribed by Robert Evans; Ross H. Wearne; Adrian F. A. Wallis

Publisher: John Wiley and Sons
Year: 1989
Tongue: English
Weight: 653 KB
Volume: 37
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.1989.070371202

No coin nor oath required. For personal study only.

✦ Synopsis

Cellulose tricarbanilates (CTCs) were prepared from a range of cellulose samples (cotton linters, wood pulps, Avicel, amorphous cellulose, and cellulose 11) for molecular weight distribution (MWD) studies by high performance size exclusion chromatography (HPSEC). The HPSEC columns were calibrated using CTC standards with the aid of a microcomputer. CTCs were prepared by reaction of cellulose samples with phenylisocyanate in pyridine at 80°C. For some samples, e.g., cellulose 11, activation with liquid ammonia and pyridine was necessary prior to reaction in pyridine. All samples tested were also derivatised in dimethylsulfoxide at 70aC, although for high molecular weight (MW) cellulose samples some MW reduction occurred in this solvent. Conditions were determined for optimum precipitation of CTCs in aqueous methanol without coprecipitation of low MW impurities.

📜 SIMILAR VOLUMES

Determination of Molecular Weight Distri

Determination of Molecular Weight Distribution of Lignin Derivatives by Aqueous Phase High Performance Size Exclusion Chromatography (HPSEC)

✍ González, A. M. ;Salager, J. L. ;Brunetto, M. R. ;Gallignani, M. ;Burguera, J. L 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 49 KB 👁 1 views

High-performance size-exclusion chromato

High-performance size-exclusion chromatography: A buffer for the reliable determination of molecular weights of proteins

✍ Franz Hefti 📂 Article 📅 1982 🏛 Elsevier Science 🌐 English ⚖ 254 KB

A high-performance size-exclusion chromatographic system is described that minimizes the ionic and hydrophobic interactions of proteins with the stationary phase. The system can be used to determine reliably the molecular weight of proteins between M, 10,000 and 70,000. A further application would b

Absolute Molecular Weight Distribution o

Absolute Molecular Weight Distribution of Low-Molecular-Weight Heparins by Size-Exclusion Chromatography with Multiangle Laser Light Scattering Detection

✍ James E. Knobloch; Patrick N. Shaklee 📂 Article 📅 1997 🏛 Elsevier Science 🌐 English ⚖ 193 KB

Molecular weight determination of 83% de

Molecular weight determination of 83% degree of decetylation chitosan with non-Gaussian and wide range distribution by high-performance size exclusion chromatography and capillary viscometry

✍ Min Larng Tsaih; Rong Huei Chen 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 198 KB 👁 2 views

Molecular weight determination of 83% degree of deacetylation (DD) chitosan with non-Gaussian and broad molecular weight distribution by high-performance size exclusion chromatography (HPSEC) and by capillary viscometry were proposed. The relationships between weight average retention volumes (RVw)

Distributions of functionality and of mo

Distributions of functionality and of molecular weights in an hydroxyl-terminated polybutadiene by dual-detection size exclusion chromatography

✍ R. O. Bielsa; M. C. Brandolini; L. Akcelrud; G. R. Meira 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 789 KB

Determination of the molecular weight di

Determination of the molecular weight distribution of polymers by high performance exclusion chromatography on microcolumns packed with lichrospher silica gel; linear calibration plot

✍ Kever, J. J. ;Belenkii, B. G. ;Gankina, E. S. ;Vilenchik, L. Z. ;Kurenbin, O. I. 📂 Article 📅 1981 🏛 John Wiley and Sons 🌐 English ⚖ 153 KB