Measurement of Viscosity of Carboxymethyl Amylopectin (CMA) Hydrogel by Rotating Viscometer Method (CAT#: STEM-PPA-0011-YJL)

Introduction

Hydrogels are crosslinked polymeric networks, which have the ability to hold water within the spaces available among the polymeric chains. The hydrogels have been used extensively in various biomedical applications, viz. drug delivery, cell carriers and / or entrapment, wound management and tissue engineering.<br />The CMA (carboximetil (-CH2-COO-Na+) amylopectin (Figure 1) is a branched chain polysaccharide, it is a gelatinizing material made of starch. The CMA, as a modified starch derivative is a typical anionic polymer, it swells in water and form hydrogel. CMA is used in food as a viscosity modifier or thickener, and to stabilize emulsions in various products including ice cream.

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Principle Applications Procedure Materials Notes Related Products

Principle

The principle of the rotating viscometer method to measure the force acting on a rotor (torque) when it rotates at a constant angular velocity (rotational speed) in a liquid. Rotating viscometers are used for measuring the viscosity of Newtonian (shear-independent viscosity) or non-Newtonian liquids (shear dependent viscosity or apparent viscosity). Rotating viscometers can be divided in 2 groups, namely absolute and relative viscometers. In absolute viscometers the flow in the measuring geometry is well defined.
The measurements result in absolute viscosity values, which can be compared with any other absolute values. In relative viscometers the flow in the measuring geometry is not defined. The measurements result in relative viscosity values, which cannot be compared with absolute values or other relative values if not determined by the same relative viscometer method. Different measuring systems are available for given viscosity ranges as well as several rotational speeds.

Applications

Mineral oil industry; Food industry; Cosmetic/pharmaceutical industry; Petroleum industry; Chemical industry

Procedure

1. Pour the liquid into the measuring cup.
2. Insert the spindle into the liquid.
3. Rotate the spindle and measure the resistance.

Materials

• Sample Type: liquid, gel-like, or semi-solid everyday substances

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