Enzymatically polymerized gelling dextrans

US10059779B2 · kind B2 · utility

Assignee

• E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

• Rakesh Nambiar · West Chester, US
• Rong Guan · Nanhu, CN
• Qiong Cheng · Wilmington, US
• Robert DiCosimo · Chadds Ford, US
• Jayme L. Paullin · Claymont, US
• Yuanfeng Liang · Chadds Ford, US
• Charles R. Powley · Wilmington, US
• Yefim Brun · Wilmington, US

Key dates

• Filing date: Nov 5, 2015
• Grant date: Aug 28, 2018
• Expiry date: Apr 27, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C12P19/08
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Compositions are disclosed herein comprising dextran that comprises (i) 87-93 wt % glucose linked at positions 1 and 6; (ii) 0.1-1.2 wt % glucose linked at positions 1 and 3; (iii) 0.1-0.7 wt % glucose linked at positions 1 and 4; (iv) 7.7-8.6 wt % glucose linked at positions 1, 3 and 6; and (v) about 0.4-1.7 wt % glucose linked at (a) positions 1, 2 and 6, or (b) positions 1, 4 and 6. Aqueous forms of this composition have enhanced viscosity profiles. Further disclosed are methods of using compositions comprising dextran, such as increasing the viscosity of an aqueous composition. Enzymatic reactions for producing dextran are also disclosed.