Dialdehyde starch
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| CASNo = 9047-50-1
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| MeSHName = Dialdehyde+starch
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|Section2={{Chembox Properties
| Formula = (C6H8O5)n
| Appearance = White, opaque crystals
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Dialdehyde starch is a polysaccharide derived by chemical modification from starch. It is prepared by periodate oxidation of starch.{{cite journal | doi = 10.1016/j.carbpol.2009.08.005| title = The preparation and properties of dialdehyde starch and thermoplastic dialdehyde starch| journal = Carbohydrate Polymers| volume = 79| issue = 2| pages = 296| year = 2010| last1 = Yu| first1 = Jiugao| last2 = Chang| first2 = Peter R.| last3 = Ma| first3 = Xiaofei}}
It has found use in the paper industry, where in it has been shown to improve the wet strength of consumer products like toilet paper and paper towels.{{US patent reference | number = 4001032 | title = Method of Making Nongelling Aqueous Cationic Dialdehyde Starch Compositions}}