Dialdehyde Starch

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Information @ a Glance

  • A natural starch from wheat or corn which has been chemically modified, the resultant starch is oxidized starch or Dialdehyde starch.

  • DAS is a polymeric dialdehyde prepared from selective oxidation of starch by periodate ions which cleaves the C2-C3 bond of the anhydroglucose units of the starch polysaccharide chain to form the dialdehyde groups.

  • Synonyms are polydialdehyde, oxidized starch, polymeric dialdehyde, starch2,3-dialdehydo.

  • There are many uses including the paper industry, where it has been mainly to improve the wet strength of consumer products. These products include toilet paper and paper towels.

  • A reactive polymer with low toxicity, considering its reactive dialdehyde functional groups, similar to glutaraldehyde.

  • DAS is essentially a highly modified starch in which the Hydroxy groups are selectively attacked by periodic acid, severing the C-2 to C-3 bond to form dialdehyde starch.

  • Obtained by oxidation of starch with periodic acid at controlled temperature and pH.

  • The highly reactive Dialdehyde groups in starch can be used as cross linking agents. Most of the applications are based on a cross linking reaction, eg. cellulose in paper, cotton in textiles, with proteins, pharmaceuticals and leather.

  • The capital investment for a capable of producing 120 tones Dialdehyde starch per annum has been estimated at Rs. 5 Lakhs. The material work costs upto Rs.5 per kg.

  • It has wide application in tanning industry apart from this it also used in plywood industry, as  binding material in tobacco industry in protective coating industry.

  • In the form of solution, it can be used as masked chrome tanning agent & increase the capacity of chrome tanning agent alkali was carbonylation dialdehyde starch as a high degree of ionization and masked with a stronger role.

  • In medical applications, DAS used as a chemical scavenger for urea and ammonia.

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