Gel stability

M.p. SS C, b.p. 2I0 C. Important fatty alcohol obtained from naturally occurring glycerides. Used in the pharmaceutical and cosmetics industries and as a gel stabilizer for greases. 

Denaturation is a change in which the natural protein becomes insoluble in solutions in which it was previously soluble. It is brought about by physical means such as heat, pressure, and surface force, or by chemical means, although very few chemical agents are used in this connection in the food field. Gel-type solutions are usually beaten before they become too thick or firmly set. As air is incorporated, the volume increases and the firmness of the gel stabilizer sets the foam. 

Gel stabilizers Defoamers Keeps gels active longer... 

Organic crosslinkers have also been used. These include glyoxal (215) and formaldehyde. Use of hypohalite salts (216,217) and epichlorohydrin (218,219) have been found to increase gel stability. 

Chemical food preservation, 12 85-86 Chemical formula, defined, 21 336 Chemical fossils, 18 571 Chemical gas scavengers, 12 77 Chemical gel stabilization, 23 71 Chemical-grade limestone, 15 27 Chemical-grade propylene, product specification for, 20 1111 Chemical hazards, 21 833-846... 

Thermal gelation, 13 73 Thermal gel stabilization, 23 71 Thermal generation, of Ag+ intermediate complexes, 19 355... 

Multipoint attachment to a support protects the enzyme from inactivation by organic solvents. Mozhaev et al. (1990) have recently demonstrated that covalent linkage to polyacrylamide gel stabilizes df-chymotrypsin from denatmation by alcohols, the stabilizing effect increasing with the number of bonds between the protein and the support. 

A novel and more general method to enable biocatalyzed conversion and synthesis of hydrophobic compounds involves the use of gel-stabilized aqueous-organic two-phase systems [8], Features, advantages, disadvantages, and perspectives of this method in asymmetric synthesis will be discussed in this chapter, illustrated for the stereoselective benzoin condensation and the reduction of ketones catalyzed by thiamine pyrophosphate (TPP)-dependent lyases and NAD(P)H-dependent alcohol dehydrogenases, respectively. 

Cofactor regeneration, an economically essential step in the synthetic use of ADH, was accomplished within the PVA matrix using isopropanol as cosubstrate for the ADH itself or for a second alcohol dehydrogenase from Thermoanaerobium hrockii (E.C. 1.1.1.2). An overall turnover number of 10 was achieved, which is a promising magnitude for technical application. However, while the presence of the cosubstrate in the gel-stabilized two-phase system improved the solubility of substrates in the gel phase and consequently enhanced the productivity of the... 

Clegg, P.S. (2008). Fluid-bicontinuous gels stabilized by interfacial colloids low and high molecular weight fluids. Journal of Physics Condensed Matter, 20, 113101. 

It is believed that, when steaming the gel at high temperatures, the V0+i attacks and breaks the Si-O-Al bonds promoting mullite formation and the collapse of the gel macroporous structure (3). The XRD pattern in Fig. 2B shows that mullite formation in the gel can be observed with only 1.5% V and when this occurs, there is a 81% decrease in surface area, Table 1. Mullite level increased with V-loadings, see Fig. 2. Data in the literature (20) indicates that when the steaming temperature is decreased to 730 C from 760 C (as in the present work) gel stability to V improved and only a 23% reduction in surface area was observed in a similar gel loaded with 1.5% V. Aluminosilicate gels are clearly less resistant than aluminas to V attack at hydrothermal conditions, Table 1. 

Although a preindustrial project of ethanol production with immobilized cells goes back to the 1980s (8), its application is still limited because of technical problems related to the gel stability and even more to the mass-transfer resistance of the gel membrane (9). Specifically, both substrate and product counterdiffusion (in addition to the presence of cells inside the beads) could reduce the diffusion coefficients of glucose and ethanol up to 13.7 and 28.1%, respectively (10). 

Snip, E., Shinkai, S., and Reinhoudt, D. N. (2001), Organogels of a nucleobase-bearing gelator and the remarkable effects of nucleoside derivatives and a porphyrin derivative on the gel stability, Tetrahedr. Lett., 42,2153-2156. 

Dried aluminum hydroxide gel Stabilizer, suspending agent, vehicle im, sc... 

The aluminum hydroxide gel exhibits thixotropic behavior. In addition, gel stability is enhanced by polyols such as mannitol and sorbitol. However, unlike other gels, aluminum hydroxide gels do not have demulcent properties they are used mainly as an oral antacid preparations. 

A straightforward explanation for the differences in gel stability is that the attractive particle-particle interactions are not mainly driven by interparticulate H-bond but by van der Waals forces. This idea is supported by pair potential calculations using an approximate expression given by Israelachvili based on the Lifshitz theory of van der Waals forces [7]. 

PPGs can be prepared with produced water without influencing gel stability. In contrast, traditional in situ gels are often very sensitive to salinity, multivalent cations, and H2S in the produced water. Using PPG can not only save fresh water but also protect the environment. 

Aloe Gel Stabilized. [Teny Labs] Aloe vera gel moisturizer for Hrst aid preps., acne and facial preps., creams, shaving xods., depilatories, shampoos, conditioners, suncare prods. 

Tafigel PUR50 stabiiizer, pastes Troykyd Anti-Gel stabilizer, PC... 

Becker T A, Kipke D R and Brakora K M (2003), Endovascular embolization of aneurysms with ALGEL an in vitro study of delivery techniques and resulting gel stability , 25th Annual international Conference of the lEEE-EMBS, Cancim, Mexico. 

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