Rice bran wax

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Rice bran wax , rice wax or rice oil wax is a vegetable wax obtained from rice oil is obtained.

properties

Rice bran wax is a yellowish white to orange-brown, hard, slightly crystalline substance and consists mainly of fatty acid esters of higher fatty alcohols , slightly palmitic acid and ceryl alcohol . The wax also contains free fatty acids as well as squalene and phospholipids . The wax content is usually greater than 96%.

The melting point of the raw wax is between 67 and 69 ° C, the saponification number is between 142 and 144; Purified wax melts at approx. 75 ° C, the saponification number is approx. 65–95, the acid number is <15 and the iodine number is <15. It is soluble in chloroform and benzene , and insoluble in water.

Extraction

Rice bran wax is obtained in the production of rice oil, raw rice oil contains approx. 3–6% wax, the wax is isolated by cooling the oil to 20–25 ° C or by winterizing , followed by filtration, or by centrifugation. Then it is either washed with solvents ( acetone , ethanol, etc.) and bleached , or hydrogenated .

Rice bran wax can also be saponified and easily deodorized .

use

Rice bran wax is mainly used for cosmetic purposes. It is used as a non-melting peeling wax , the particle size distribution of which can be adjusted over a wide range. The rice bran wax is micronized by dispersing it in water-solvent mixtures at an elevated temperature, followed by cooling, filtration and drying. Micronized wax particles are obtained over a wide range of particle sizes.

Rice bran wax is also a source of policosanols with fatty alcohols of 24 to 36 carbon atoms per molecule.

Individual evidence

  1. ^ NIIR Board of Consultants & Engineers: The Complete Technology Book on Wax and Polishes. Asia Pacific Business Press, 2011, ISBN 978-81-7833-012-9 (Reprint), p. 55.
  2. ↑ natural waxes; Key figures on chemie.varistor.ch, accessed on March 12, 2017.
  3. ↑ Junghong Kim: Wax Extraction and Characterization from Full-Fat and Defatted Rice Bran. Dissertation, Louisiana State University, 2008, online ( memento of the original dated December 23, 2015 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. (PDF; 3.56 MB), from etd.lsu.edu, accessed on March 12, 2017. @1@ 2Template: Webachiv / IABot / etd.lsu.edu
  4. ^ Giuseppe Mazza: Functional Foods. Technomic Publishing, 1998, ISBN 1-56676-487-4 , p. 78 f.
  5. ↑ Rice Bran Oil Processing and Value added Products (PDF; 5.04 MB), on ofievents.com, accessed on March 12, 2017.
  6. ↑ Marina Bährle-Rapp: Lexicon cosmetics and body care. 4th edition, Springer, 2012, ISBN 978-3-642-24687-6 , p. 491.
  7. ↑ Rice bran wax on cosmacon.de, accessed on March 12, 2017.

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