Coacervation of Starch IV. Effect of Added Salts or Furfural on Stability of Coacervated Starch-Chloral Hydrate Systems
✍ Scribed by Robert E. Baker; Dr. Majel M. MacMasters
- Publisher
- John Wiley and Sons
- Year
- 1967
- Tongue
- English
- Weight
- 543 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0038-9056
No coin nor oath required. For personal study only.
✦ Synopsis
Coacervation of Starch IV. Effect of Added Salts or Furfural on Stability of Coacervated Starch-Chloral H y d r a t e Systems*)
By KORERT E. BAKER and MAJEL M. MACMASTERS**), Manhattan, Kansas (USA) r r i l ( . iIlflucncc of various neutral salts 011 composit ioii n l l c l morphology of coaecrratrs of gelatin and g u m c2~~~hi,jcha.g been studied l>y ~~UZ(:F:UBERC, D K .JON(: and eo-workers (1, 2 , 3, 4). At constant pH ant1 COIIstant mixing proportion of the colloids iir tlw total systcm, thc addition of salts was shomn to causc a changv not only in the percentagc of water in a coinplex coaccrvatr but also in the proportion of tho colloids in it. Changes in diameter of coacervatc drops on addition of salts have also bern investigated (4). Upon variation of the p H , the diameter of the drop was Sound to pass through a minimum which occurred very close to pH 3.7 a t which, with the ratio of gelatin to gum arabic studied, complex coacervation was optimum. At low salt concentrations the changes in diameter \rere reversible : a t higher concentrations irrcversiblr : the double valence rule was shoir n t o hold.
Several instances of starch coacervation recently
have bcrn studied by SCHULZE ct al. (14), Yrr and MAC-MASTERS (15), and CHVNG and MACMASTERS (6). Thcy suggested that the starch coaccrvates obtained oii frerzing, or on adding chloral hydrate or salts, resulted from partial dcsolvation of colloidal micelles of the, starc+ sol.
The prescnt work was concerned with conditions affecting the stability of starch coacervates.
Xaterials and Methods
It'hrlct Starch
Starch was separated by washing from three hard red winter wheat flours, each from a single variety (Triumph, C. I. 13285, C.I. 13523).