orabase has been researched along with sulfuric-acid* in 2 studies
2 other study(ies) available for orabase and sulfuric-acid
| Article | Year |
|---|---|
Two-Dimensional Aggregation and Semidilute Ordering in Cellulose Nanocrystals.
The structural properties and aggregation behavior of carboxymethylated cellulose nanocrystals (CNC-COOH) were analyzed with small angle neutron scattering (SANS), transmission electron microscopy (TEM), atomic force microscopy (AFM), and dynamic light scattering (DLS) and compared to sulfuric acid hydrolyzed cellulose nanocrystals (CNC-SO3H). The CNC-COOH system, prepared from single carboxymethylated cellulose nanofibrils, was shown to laterally aggregate into 2D-stacks that were stable both in bulk solution and when adsorbed to surfaces. CNC-SO3H also showed a 2D aggregate structure with similar cross sectional dimensions (a width to height ratio of 8) as CNC-COOH, but a factor of 2 shorter length. SANS and DLS revealed a reversible ordering of the 2D aggregates under semidilute conditions, and a structure peak was observed for both systems. This indicates an early stage of liquid crystalline arrangement of the crystal aggregates, at concentrations below those assessed using birefringence or polarized optical microscopy. Topics: Birefringence; Carboxymethylcellulose Sodium; Flocculation; Hydrolysis; Nanoparticles; Optical Imaging; Sulfuric Acids; Viscosity | 2016 |
Identification of polysaccharides in pharmaceuticals by capillary gas chromatography.
A sensitive method for the identification of polysaccharides in pharmaceuticals is described. Polysaccharides are isolated by gel filtration and subsequently hydrolysed. The monomeric carbohydrates obtained are transformed into oxime-trimethylsilyl derivatives and analysed by capillary gas chromatography. Profiles of 13 different natural or semi-synthetic polysaccharides are discussed. The profiles of the hydrolysis products can be used to identify the polysaccharides mentioned above. Possible interferences by other polymers are given. The method can be used to identify most polysaccharides used as pharmaceutical adjuvants. Topics: Alcohols; Amylose; Carbohydrates; Carboxymethylcellulose Sodium; Cellulose; Chromatography, Gas; Chromatography, Gel; Emulsions; Hydrolysis; Indicators and Reagents; Ointments; Polysaccharides; Sulfuric Acids; Trimethylsilyl Compounds; Uronic Acids | 1989 |