Artificial tanning

A final example of a mass-sensitive MIP device is a B AW sensor for determination of phenacetin in human serum and urine (Tan, Peng, et al. 2001). A phenacetin imprinted polymer was synthesized and used as the artificial recognition element on a piezoelectric element. 

Dr. John Bostock tried unsuccessfully to use Hatchett s artificial tan as a test for jelly [gelatine]. Although it had been stated on the highest authority, that of Mr. Hatchett and Mr. Davy. . . that isinglass consists of nearly pure jelly, Dr. Bostock found that isinglass from the shops contained a certain amount of insoluble matter which he believed to be coagulated albumen. Dr. G. Melandri of Milan also investigated Hatchett s tannin. 

Michel-Eugene ChevreuI, 1786-1889. French chemist and psychologist who made notable contributions to the chemistry of fats and oils, soap, candles, and dyes. He lived to be almost one hundred and three years old, sound and active in mind and body. When he investigated Hatchett s artificial tanning agents, ChevreuI was only twenty-four years old (twenty-one years younger than Hatchett). See refs. (48, 49, and 52). 

The following paragraphs deal especially with the tests and determinations to be made on the principal natural and artificial organic dyes, and among the former are considered certain tanning materials (q.v.) which also serve as colouring matters, namely, catechu and gambier. 

Dyeing extracts may be mixed or adulterated with tanning extracts and may also be adulterated with artificial organic dyes or -various inert substances, either organic (molasses, glucose, dextrin, starch, glue) or inorganic (sodium sulphate and other soluble salts, and insoluble substances). 

Dihydroxyacetone is an ingredient of suntan lotion that creates an artificial tan. It is also valuable as a chemical intermediate and as a catalyst in butadiene-styrene polymerization. 

UVC (100 to 290 nm) is mainly filtered by the o2one layer but can be found in artificial situations such as arc welding lamps. UVB (290 to 320 nm) causes sunburn and is responsible for most of the harmful effects of UV radiation. UVA (320 to 400 nm) produces tanning and the photosensitivity reaction.The cornea absorbs UV radiation up to 295 nm, primarily in the epitheliiun and Bowman s membrane. 

Dihydroxyacetone is the active ingredient in many artificial tanning agents. 

Chan EC, Tan WL, Ho PC, Fang LJ. Modeling Caco-2 permeability of drugs using immobilized artificial membrane chromatography and physicochemical descriptors. J Chromatogr A 2005, 29 Apr 1072(2) 159-168. 

Tan, K. C., Khor, E. F., Lee, T. H. and Sathikannan, R. (2003). An Evolutionary Algorithm with Advanced Goal and Priority Specification for Multi-objective Optimization. J. Artificial Intelligence Research, 18, pp.183-215. 

Dihydroxyacetone (DHA), the oxidation product of the secondary hydroxy group of glycerol, is an artificial tanning agent in cosmetics and a pharmaceutical intermediate. Glycerol oxidation in acidic medium on a platinum-bismuth catalyst (Bi/ Pt atomic ratio = 3) prepared by coprecipitation of Pt and Bi salts, yielded 20 % DHA at 30 % conversion [70]. The deposition of bismuth on platinum particles by oxido-reduction (Bi/Pt = 0.13) yielded 37 % DHA at 70% conversion... 

USE Soldering metals manuf glazes and enamels tanning in cleaning compds artificially aging wood as preservative,... 

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