Gelatin of zinc

Gelatin of Zinc, B,P, (Unna s Paste). Zinc oxide and gelatin, 15 per cent each, with glycerin, 35 per cent w/w and water. 

Gelatin of Zinc and Ichthammol, B.P.C, Contains 15 per cent of zinc oxide. 

The zinc can be assayed by the method given above under Cream of Zinc and Ichthammol or by complexometric titration as given under Gelatin of Zinc. 

This material has been known for many years, being used originally in the making of electric lamp filaments. In principle vulcanised fibre is produced by the action of zinc chloride on absorbent paper. The zinc chloride causes the cellulosic fibres to swell and be covered with a gelatinous layer. Separate layers of paper may be plied together and the zinc chloride subsequently removed to leave a regenerated cellulose laminate. 

The effect of temperature on the corrosion of zinc in water It is found that the temperature has a marked effect on the rate at which zinc corrodes in water. The corrosion rate in distilled water reaches a maximum in the temperature range 65-75°C. This variation in the corrosion rate with temperature is attributed to changes in the nature of the protective film. At lower temperatures the film is found to be very adherent and gelatinous, while at temperatures around 70°C it becomes distinctly granular in character and much less adherent. Above 75°C it again tends to become more adherent and assumes a very compact and dense form. It is believed that the granular coating formed at temperatures around 70°C is more porous... 

Fig. 8 Surface morphology of zinc deposits from (a) the gelatin-free solution 0.5 M ZnCb + 2 M HCl and (b) gelatin-containing solution 0.75 M ZnCl2 + 1.5 M HCl [380].

Sodium hydroxide solution white gelatinous precipitate of zinc hydroxide Zn2+ +20H- Zn(OH)2 ... 

The aluminum in the zinc phosphate cements was considered very important, van Dalen [21] recognized its importance first. The reaction of zinc oxide and phosphoric acid was greatly moderated by aluminum. This effect was attributed to formation of an aluminum phosphate gelatinous coating on zinc oxide particles. In fact, Wilson and Nicholson believe that the gelatinous substance may even be zinc aluminophosphate phase [3], which subsequently crystallizes into hopeite and aluminophosphate amorphous gel (AlP04-nH20). 

Oxime 5 was synthesized by treatment of t-butyl acetoacetate with sodium nitrite in acetic acid. Reaction of 5 wim p-ketoamide 6 in me presence of zinc and acetic acid according to the classic Knorr pyrrole formation conditions led to pyrrole 12. Aimough mis reaction worked fairly well (60 to 70% yield), workup and product isolation proved problematic as the reaction scale was increased (>10 g). Typically, the products of Knorr reactions (when p-ketoesters are used instead of p-ketoamides) are isolated by a water knock-out at me end of me reaction. However, in the case of 12, me presence of me pendant amine functionality rendered precipitation of the product from an acidic reaction mixture impossible. Precipitation of me product required basic conditions unfortunately, at pH 9, gelatinous zinc salts crashed out of solution, making an extraction or isolation... 

Tho solutions ot zinc are precipitated white by tho pure aLkalles and carbonate of ammonia, but are completely redissolved by excess of tbo precipitant. The carbonates of potassa and soda give a permanent white precipitate of carbonate of zinc. Hydrosulpburet of ammonia also gives a white precipitate, and so does sulphuretted hydrogen when the solution is quite neutral, Prussiate of potash ves a gelatinous white, or bluish-wbite precipitate. 

The oxide which is formed when zinc is burned in the air is the only compound of these elements.. It may also be obtained by heating the carbonate to redness, or by precipitating the sulphate of zinc by a caustic alkali, in which latter case W e obtain a bulky gelatinous hydrate of the oxide. Oxide of zinc... 

In the first step, the 5 ml test solution is added to 0.2 ml strong sodium hydroxide solution R. A white gelatinous precipitate of zinc hydroxide is formed. 

Foods rich in zinc include red meat, milk, gelatin, egg yolks, shellfish, liver, whole grain cereals, lentils, peas, beans, and rice. About 20-30% of zinc in the diet is absorbed, but this is highly variable and ranges from <10% to >90%. Increased zinc absorption, for example. 

Rajendra R, Balakumar C, Ahammed H, Jayakumar S, Vaideki K, Rajesh E (2010) Use of zinc oxide nano particles for production of antimicrobial textiles. Int J Eng Sci Technol 2 202-208 Ratnayake WS, Jackson DS, Steve LT (2008) Starch gelatinization. Adv Food Nutr Res 55 221-268 Ray S, Okamoto M (2003) Polymta/layeted silicate nanocomposites a review from preparation to... 

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