Artificial lipid membrane: surface modification and effect in taste sensing

Abstract

In this work, an artificial lipid membrane was synthesized using tetra-dodecyl ammonium bromide (TDAB) and doped with gold nanoparticles (AuNP). The taste sensor designed using artificial lipid membrane is composed of tetradodecylammonium bromide (TDAB) as a lipid, dioctylphenyl phosphonate (DOPP) as a plasticizer, and polyvinyl chloride (PVC) as a supporting polymer in the ratio of 1:3:2. The lipid/polymer membrane acts as the recognition element which transforms the taste information generated by the chemical substances into an electric potential change. The fundamental taste analytes (like fructose for sweetness, HCl for sourness, NaCl for saltiness, MgCl2 for bitterness and MSG for umami) were used to study the effect of doping on taste sensing at different concentrations (10μM to 10mM). The study was based on the open circuit potential (OCP) change of the membrane with the analytes. The observations implicate that the doping increases the specificity of the artificially synthesized lipid membrane taste sensor for the sweet analytes, particularly for fructose.

Viburnum tinus Fruits Use Lipids to Produce Metallic Blue Structural Color

“…Therefore, rather than dealing with each disorder element individually, the structure and material composition of the V. tinus cell wall was approximated as disordered 1D multilayers with refractive indices corresponding to cellulose (n = 1.55 ) [27] and a typical plant lipid (n = 1.47). [28] The model includes water immersion conditions, and the existence of a dark anthocyanin absorptive pigment underneath. The anthocyanin absorption spectrum used here is the cyanidin-3-glucoside extracted from bilberry (Vaccinium myrtillus), [29] which is one of the primary anthocyanins previously identified in V. tinus (the other being cyanidin 3-(200-xylosylglucoside)-5-glucoside).…”

Self-assembled, disordered structural color from fruit wax bloom

“…We made optical models using Lumerical 2019b Finite Difference IDE, a commercial Maxwell equation solver. We estimated the refractive index of the particles as 1.47 ( 61 ). This is a low-precision assumption, and future work should aim to improve precision on the dispersive refractive index.…”

Multiple origins of lipid‐based structural colors contribute to a gradient of fruit colors in Viburnum (Adoxaceae)

“…In the 1D approach, we modeled the material as a multilayer with alternating cellulose ( n = 1.55; Cranston & Gray, 2008) and lipid‐refractive indices (dispersive refractive index; Kumar et al ., 2018). The distribution of layer thicknesses of both phases was measured from TEM profiles of V. tinus and V. dentatum , and this distribution of sizes was used for the 1D optical simulations.…”