Selective adsorption of 1,3-dimethyltrisulfane (DMTS) responsible for aged odour in Japanese sake using supported gold nanoparticles

Abstract

Gold (Au) nanoparticles (NPs) supported on SiO2 (Au/SiO2) were prepared by a practical impregnation method and applied as an adsorbent for 1,3-dimethyltrisulfane (DMTS), which is responsible for an unpleasant odour in drinks, especially Japanese sake. Compared with a conventional adsorbent, activated carbon, Au/SiO2 selectively reduced the DMTS concentration in Japanese sake without decreasing the concentrations of other aromatic components. DFT calculations revealed that the selective adsorption of DMTS occurred through the formation of a stable intermediate. The size of the supported Au NPs was controlled by the preparation conditions and determined from TEM observations and XRD measurements, and the size was ranged from 2.4 nm to 30 nm. Au/SiO2 having Au NPs with a diameter of 2.4 nm adsorbed DMTS the most efficiently. Smaller Au NPs showed better DMTS adsorption capabilities because larger amounts of Au atoms were exposed on their surfaces in the size range of this study. Langmuir-type monolayer adsorption and one-to-one binding of Au–S are proposed to occur based on an adsorption isotherm experiment. Even though significant differences of the fruity aroma score were not observed in the sensory evaluation between Au/SiO2 and activated carbon for this less aromatic Japanese sake, Au/SiO2 selectively decreased the DMTS concentration in the instrumental analysis.

Supported Noble Metal Catalysts and Adsorbents with Soft Lewis Acid Functions

“…Consequently, a Langmuir‐type adsorption isotherm was obtained, in which the amount of adsorption was saturated when the Au/S ratio was reduced to less than 1 (Figure 21). [24b] The surface atoms of Au, with an average particle size of 3.5 nm were approximately 40 %, suggesting that Au and S were bound in a 1 : 1 ratio (Figure 22).…”

A Narrative Review of Sulfur Compounds in Whisk(e)y

“…This technology might provide a way to optimize the maturation period, and eventually lead to the control of sulfur volatiles in whisky. Interestingly, a gold nanoparticle supported on silicon dioxide has been reported for the selective removal of DMTS in Japanese sake [ 85 ]; as yet, however, this approach does not seem to have been applied to distilled spirits.…”

Unveiling adsorption generality in polymeric macromolecules

“…Over the last few decades, nanomaterials science has gained a critical position for a manifold of technological, scientific and applicative purposes. [1][2][3] In particular, the design of novel functionalised nanoparticles that are able to selectively adsorb and release cargo in crowded environments has gained critical importance in the design of novel drug delivery systems, 4,5 in the removal of contaminants in aqueous solutions, 6,7 in the food industry, 8 and in the design of novel smart materials. 9,10 Due to the wide spectrum of promising applications, the materials science community has focused much of its effort on designing and developing functionalised materials at the nanoscale.…”