Starch, dialdehyde

In addition to these resins, polyethyleneimines and dialdehyde starches are also used to a lesser degree. 

Iodine-assisted cleavage of the vicinal diol group of dextran has been investigated [77]. Dialdehyde starch (63) can... 

Periodate regeneration was technically applied for the synthesis of dialdehyde starch from starch (Table 4, No. 64) and recently for the generation of acetaldehyde from 2,3-butanediol (Table 4, No. 65)... 

Veelaert S. Dialdehyde Starch Production, Properties and Applications. Belgium Ghent University August 1996. [Thesis],... 

Aldehyde starches are prepared by treatment with periodic acid/periodate ions, which selectively oxidize the adjacent hydroxyl groups on carbon atoms 2 and 3 to aldehyde groups. Dialdehyde starch can react with cellulose by forming covalent hemiacetal and acetal bonds.40 It is primarily used as a wet strength agent in the production of tissue and other sanitary grades. 

Dialdehyde starch,176-178 block reactive starch179 and cationic aldehyde starch180 181 comprise a special class of starches that can react with cellulose through the formation of covalent hemiacetal or acetal bonds. The zwitterion group is another functional group that has been utilized in conjunction with cationic and acetal groups. 

A wide range of thermoplastic starch compounds have been claimed in recent years. Formulations of thermoplastic starch with linear, biodegradable polyesters, including polycaprolactone and PHBV,174 176 and with polyamides175 have been reported. Laminated structures have been claimed using thermoplastic starch or starch blends as one or more of the layers.175,177,178 The use of polymers latexes as components of thermoplastic starch blends has also been claimed.179 181 Blends with natural polymers are also claimed, including cellulose esters182,183 and pectin.184 A crosslinked thermoplastic material of dialdehyde starch and protein has been reported.185... 

Mehltretter, C. L. (1964). Dialdehyde starch. Methods in Carbohydrate Chemistry, Vol. IV, p. 316. Academic Press, New York. 

As an example the characterization of surface grafting onto an ethylene-vinyl alcohol (33 67) random copolymer (EVA) film33 is described here. Since this water-insoluble film has hydroxyl groups on the surface, surface grafting may occur, for instance, with the so-called dialdehyde starch (DAS), whose chemical structure is given by... 

Acetylcholineesterase and choline oxidase Enzyme immobilized over tetra-thiafulvalene tetracyanoquinodi-methane crystals packed into a cavity at the tip of a carbon-fiber electrode. The immobilization matrix consisted of dialdehyde starch/glutaraldehyde, and the sensor was covered with an outer Nafion membrane. The ampero-metric performance of the sensor was studied with the use of FIA system. An applied potential of +100 mV versus SCE (Pt-wire auxiliary electrode) and a carrier flow rate of 1 mL/min. The Ch and ACh biosensors exhibited linear response upto 100 pM and 50 pM, respectively. Response times were 8.2 s. [97]... 

Cellulose carbamate and its derivatives are able to immobilize enzymes easily with the help of dialdehydes such as dialdehyde starch, glutaraldehyde, and glyoxal [62]. Since cellulose triphenylcarbamate or tricarbanilate prepared... 

Composite 80% Insoluble Collagen Fiber—20% Dialdehyde Starch Soluble Collagen... 

All of the crosdinked implants lasted for at least 60 days. At this time, a few of the enzyme-solubilized collagen films crosslinked with either glutaraldehyde or dialdehyde starch appeared to be thinner. Some of the films crosslinked with glutaraldehyde appeared to be somewhat thinner after 90 days, although most were intact. 

Weakley FB and Mehltretter CL. Binding of papain to dialdehyde starch. Biotechnol. Bioeng. 1973 15 1189-1192. 

Starch was oxidized by Jackson and Hudson,who used periodic acid at room temperature. Considerable study has recently been made of the oxidation of starch on a commercial basis, using electrolytically regenerated periodic acid. The reaction is carried out under what are normally drastic conditions for a periodate oxidation, namely pH 1.2-1.4 and 100°F, apparently without occurrence of any over-oxidation. Oxystarch is known commercially as dialdehyde starch. ... 

The uses of periodate-oxidized carbohydrates are thus far confined to uses for oxycelluloses and, more particularly, oxystarches ( dialdehyde starches ). Following the development of the electrolytic regenerative process for periodic acid, oxystarch has been produced commercially in the United States by the Miles Chemical Company of Elkhart, Indiana. 

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