SUPPORTING INFORMATION Gold Nanoparticle-mediated signal amplification of Liquid Crystal biosensors for dopamine Rajib Nandi,‡ Lisha Loitongbam,‡ Joydip De, Varsha Jain and Santanu Kumar Pal* Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector-81, Knowledge City, Manauli-140306, India 1. Experimental Details 1.1 Materials N,N-Dimethyl-N-octadecyl-3-aminopropyltrimethoxysilyl chloride (DMOAP), 5CB, 3-Pyridinylboronic acid, Gold(III) chloride trihydrate (HAuCl4·3H2O), sodium citrate, dopamine (DA), dithiobis [succinimidylpropionate] (DSP), ascorbic acid, glucose, epinephrine, norepinephrine and PBS buffered saline (pH 7.4) were obtained from Sigma Aldrich, India. Tyramine and Serotonin were purchased from TCI chemicals, India. Sulfuric acid and hydrogen peroxide (30% w/v) were purchased from Merck. Ethanol was obtained from Jebsen & Jenssen GmbH and Co., Germany. Fischer's Finest Premium Grade glass slides were obtained from Fischer Scientific. Deionization of a distilled water source was performed using a Milli-Q-system (Millipore, bedford, MA). Gold specimen grids (20 μm thickness, 50 μm wide bars, 282 μm grid spacing) were obtained from Electron Microscopy Sciences (Fort Washington, PA). Electronic Supplementary Material (ESI) for Analyst. This journal is © The Royal Society of Chemistry 2019