Soluble parts in gelatin/water gels

Abstract

So-called soluble parts were extracted from gelatidwater gels by means of deswelling caused by application of a swelling pressure. The soluble parts were characterized by FTIR spectroscopy, time-of-flight mass spectrometry, analytical ultracentrifugation and amino acid analysis. The results are compared with literature data.The extracted gelatin has a composition similar to the original gelatin. The extract has a much lower molar mass than the soluble parts obtained by different extraction procedures reported in the literature. This supports the conclusion that there must be at least two types of soluble parts. Soluble part of type 1 has molar masses up to 4000 g/mol, has composition similar to the original gelatin and shows virtually no gelling abilities, although an association of the molecules occurs. Soluble part of type 2 consists of a significant amount of a,(I) chains of type (I) collagen or their fragments and probably has weak gelling abilities.

Development of a Fast Fiber Based UV-Vis Multiwavelength Detector for an Ultracentrifuge

“…In addition, turbidity optics was developed for the characterization of particle size distributions of colloidal particles [6][7][8][9]. Despite some progress on the detector or illumination part of the optical systems concerning the transformation of photographic detection to CCD chip detection for Schlieren and Interference optics or the use of laser light sources [10][11][12][13][14][15][16][17][18] (for further references see also the references for multiplexer systems) and photomultiplier detection for the UV-Vis [19] and fluorescence optics [3,4], the classical optical systems remained essentially unchanged for decades. Exceptions are the Flossdorf optics [20], which significantly increased the detected intensity for UV-Vis optical systems and the ultrasensitive Schlieren optics [21].…”