Abstract
To develop sustainable value-added materials from biomass, novel small-molecule sugar ester gelators were synthesized using biocatalysis. The facile one-step regiospecific coupling of the pro-antioxidant raspberry ketone glucoside and unsaturated or saturated long- and medium-chain fatty acids provides a simple approach to tailor the structure and self-assembly of the amphiphilic product. These low molecular weight molecules demonstrated the ability to self-assemble in a variety of solvents and exhibited supergelation, with a minimum gelation concentration of 0.25 wt %, in numerous organic solvents, as well as in a range of natural edible oils, specifically a relatively unstudied group of liquids: natural medium-chain triglyceride oils, notably coconut oil. Spectroscopic analysis details the gelator structure as well as the intermolecular noncovalent interactions, which allow for gelation. X-ray diffraction studies indicate fatty acid chain packing of gelators is similar to that of natural fats, signifying the crystalline nature may lead to desirable textural properties and mouthfeel.
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