Trifluoroacetic acid (TFA, 99%),
α-cyano-4-hydroxycinnamic acid (CHCA, 98%),
cyclohexane (99.5%),
l-serine (99%),
l-aspartic acid (98%), cell free amino acid mixture-
15N (98%, 767972-1 EA) and 1H,1H,2H,2H-perfluorodecanethiol (PFDT, 97%) were purchased from Sigma-Aldrich (St. Louis, MO, USA). HAuCl
4·4H
2O (99.9%),
acetonitrile (99.9%),
ethanol (99.7%) and m
ethanol (99.8%) were purchased from Sinopharm Chemical Reagent Co. Ltd. (Shanghai, China).
l-arginine (99%),
l-valine (99%) and sodium citrate tribasic dihydrate (99%) were purchased from J&K Scientific (Beijing, China). Novec™ 7500 Engineered Fluid (HFE-7500) was purchased from Minnesota Mining and Manufacturing Corporation (Maplewood, MN, USA). Deionized (DI) water (18.2 MΩ cm) used in all experiments was obtained from a
Milli-Q system (Millipore, Bedford, MA, USA). SEM images were collected on a
Zeiss Gemini 300 scanning electronic microscopy (Carl Zeiss AG, Oberkochen, Germany). MALDI-TOF MS analysis was performed with a Bruker
MicroFlex LRF mass spectrometer (Bruker, Bremen, Germany). Optical microscopic image was obtained with inverted microscope (Cewei Optoelectronic Technology Ltd, Shanghai, China).
Han X., Li D., Wang S., Lin Y., Liu Y., Lin L, & Qiao L. (2022). Serum amino acids quantification by plasmonic colloidosome-coupled MALDI-TOF MS for triple-negative breast cancer diagnosis. Materials Today Bio, 17, 100486.