Monoesters of glycosides and a process for enzymatic preparation thereof
申请人:Novo Nordisk A/S
公开号:US05191071A1
公开(公告)日:1993-03-02
Compounds of the formula (R-COO).sub.n X-OR.sup.1, wherein R.sup.1 is optionally substituted alkyl, phenyl, or alkyl phenyl, n is 1, 2 or 3, X is a carbohydrate moiety, and R is optionally substituted alkyl, have superior effects as additives in detergents. These compounds can be prepared by esterification of glycosides using specific enzymes.
Esters of monosaccharides and their lower alkyl glycosides are effective both as surfactants and as bleach activators (peracid precursors). The compounds are non-toxic and biodegradable. They act as nonionic surfactants and are effective in soil removal from textiles, e.g. of fatty soiling. In the presence of a hydrogen peroxide source, the sugar derivatives are perhydrolyzed during the washing process to form long-chain peracid. This enhances the bleaching effect, especially on hydrophobic stains.
A chlorine bleach-free aqueous liquid machine dishwashing composition having solution pH 7-11 contains proteolytic enzyme, detergency builder, sodium silicate having SiO₂:Na₂O ratio of from 2.0-3.2 and organic surfactant which comprises (i) glycoside surfactant, (ii) anionic sulphate or sulphonate including a C₈ to C₂₂ alkyl or alkenyl group or (iii) ethoxylated C₆ to C₁₆ fatty alcohol with HLB of at least 10.5, or a mixture of (i), (ii) and/or (iii). If (iii) is used without (ii) it must be an ethoxylated C₆ to C₁₂ alcohol, or glycoside surfactant must also be present. Proteolytic enzyme plus the specified surfactant gives a synergistic improvement in removal of proteinaceous soil.