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By C B Anfinsen


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Gums and stabilisers for the food industry 14

Content material: Giving nature a aiding hand -- blending hydrocolloids and water : polymers as opposed to debris -- exact microscopic visualisation of hydration and swelling in a speedily hydrating particle mattress containing a cellulose ether -- Swelling behaviour of calcium pectin gel beads -- Processing-structure-property relationships in biopolymer gel debris -- Diffusing wave spectroscopy experiences of rennet-induced gelation of milk within the presence of pectin -- functionality of a resistant starch sort three in non pre-fried battered nutrients -- Textural and color alterations in the course of stroage and sensory shelf lifetime of tarts containing resistant starch -- Dramatic alterations in bulk deformation behaviour of gellan gum on cross-linking with combined cations -- Hydration learn of soy protein within the "dry country" -- 2s soy protein : a misnomer therefore forgotten yet sensible however -- Adhesive interactions among gelatinised starch granules -- bodily 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Extra info for Advances in Protein Chemistry, 4

Sample text

From studies of double refraction of flow (Edsall, Foster, and Scheinberg, 1947)) and sedimentation and viscosity (Oncley, Scatchard, and Brown, 1947), the dimensions of the fibrinogen molecule considered as an elongated ellipsoid of revolution have been estimated to be 35 A. , with a molecular weight of about 500,000; assumption of the shape of a cylindrical rod would probably not alter these figures greatly. The amino acid composition of fibrinogen is characterized by rather high proportions of residues containing sulfur and also hydroxyl groups (Brand, 1944, 1946).

A somewhat different interpretation from that of Northrop and Kunitz of the swelling behavior of isoelectric gelatin can be given in the light of more recent theories of flexible networks (Section 4,b, page 44). 34 JOHN D. FERRY X - R a y Analysis. 4 A. 5 A. (Herrmann, Gerngross, and Abitz, 1930; Katz, Derksen, and Bon, 1931, 1932). 5 A. 0 A. 8-A. and 8-A. spacings are meridional and the 12-A. spacing equatorial (Herrmann, Gerngross, and Abitz, 1930; Derksen, 1935). 8 A. 5 A. 5 A. over a concentration range from 70 % to 30 %.

The equilibrium value FIG. 14. Light scattering by 1% gelatin solutions, plotted against pH. I, 17"; 11, 23'; 111, 30'; IV, 40" and 50". From Kraemer and Dexter (1927). of optical rotation (taken after the initial rapid change is completed but before the subsequent slow change has progressed appreciably) was found by Smith (1919) to depend upon both concentration and temperature. ; the specific rotation was about -141". Below 35" the numerical value increased with decreasing temperature and was no longer proportional to concentration.

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