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(1)H NMR-based DS Determination of Barley Starch Sulfates Prepared in 1-allyl-3-methylimidazolium Chloride

(1)H NMR-based DS Determination of Barley Starch Sulfates Prepared in 1-allyl-3-methylimidazolium Chloride

Johanna Kärkkäinen, Tiia-Riikka Wik, Matti Niemelä, Katja Lappalainen, Päivi Joensuu, Marja Lajunen

Carbohydr Polym. 2016 Jan 20;136:721-7.

PMID: 26572405

Abstract:

The use of natural resources in a development of products and materials is currently increasing. Starch is one of the investigated resources due to its bioavailability, biodegradability, safety and affordability. In this study, native barley starch was sulfated using a SO3-pyridine complex. The reaction was carried out for the first time using 1-allyl-3-methylimidazolium chloride ionic liquid, an excellent solvent for the starch modification. Reaction conditions (temperature, time and amount of the reagent) were studied using an experimental design. Starch sulfates with the degree of substitution (DS) 1.37 were obtained when the reaction was carried out at 40 °C for 75 min with 4:1 molar ratio of SO3-pyridine complex:anhydroglucose unit. The determination of DS was based on (1)H NMR instead of elemental analysis, which showed overestimated DS values in this study. Starch sulfates were analyzed with FTIR and HPLC, which showed that products contained small and large sulfated molecules.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP65039103	1-Allyl-3-methylimidazolium chloride		65039-10-3	Price

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