1H-13C NMR-based profiling of biotechnological starch utilization

Ulrik K. Sundekilde, Sebastian Meier

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Abstract

Starch is used in food-and non-food applications as a renewable and degradable source of carbon and energy. Insight into the chemical detail of starch degradation remains challenging as the starch constituents amylose and amylopectin are homopolymers. We show that considerable molecular detail of starch fragmentation can be obtained from multivariate analysis of spectral features in optimized 1H-13C NMR spectroscopy of starch fragments to identify relevant features that distinguish processes in starch utilization. As a case study, we compare the profiles of starch fragments in commercial beer samples. Spectroscopic profiles of homooligomeric starch fragments can be excellent indicators of process conditions. In addition, differences in the structure and composition of starch fragments have predictive value for down-stream process output such as ethanol production from starch. Thus, high-resolution 1H-13C NMR spectroscopic profiles of homooligomeric fragment mixtures in conjunction with chemometric methods provide a useful addition to the analytical chemistry toolbox of biotechnologi-cal starch utilization.
Original languageEnglish
JournalAnalytical chemistry
Volume88
Issue number19
Pages (from-to)9685-9690
Number of pages8
ISSN0003-2700
DOIs
Publication statusPublished - 2016

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