Arginine

Arginine, also known as l-arginine (symbol Arg or R),[1] is an α-amino acid that is used in the biosynthesis of proteins.[2] It contains an α-amino group, an α-carboxylic acid group, and a side chain consisting of a 3-carbon aliphatic straight-chain ending in a guanidino group. At physiological pH, the carboxylic acid is deprotonated (−COO−), the amino group is protonated (−NH3+), and the guanidino group is also protonated to give the guanidinium form (-C-(NH2)2+), making arginine a charged, aliphatic amino acid.[3] It is the precursor for the biosynthesis of nitric oxide. It is encoded by the codons CGU, CGC, CGA, CGG, AGA, and AGG. (From Wikipedia, read more)

The graph shows the SERS spectrum of 10^-3 M, Arginine on Premium-AgAu substrates.

Laser wavelength: 785 nm
Laser power: 30 mW
Integration time: 6 seconds
Raman Spectrometer: B&WTEK
Lens magnification: 50x
Sampling method: immersion
The substrate used: Premium-AgAu hydrophilic (interchangeably, you can use one of our substrates)