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3 protocols using cell free amino acid mixture 15n

1

Targeted Metabolomics Using Nano-DESI

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Solvents were HLPC-grade
methanol (MeOH) (Fisher Scientific), water from Milli-Q Plus, LC/MS-grade
acetonitrile (Fisher Chemical), and formic acid (Merck). The standards
used for quantitation were Cell Free Amino Acid Mixture-15N (Sigma-Aldrich), glucose-d2, γ-aminobutyric
acid-d2 (GABA-d2), acetylcholine-d9, oleic acid-d9 (FA 18:1-d9),
LPC 19:0, PC 11:0/11:0. Solvents for PA nano-DESI analysis were MeOH/H2O (9:1) with 0.1% formic acid or ACN/MeOH (9:1) with 0.1%
formic acid (Table S1).
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2

Metabolite Quantification in Insulin-Secreting Cells

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Solvents for extraction
were HLPC-grade methanol (MeOH) (Fisher Scientific), Milli-Q water
(H2O) from Milli-Q Plus, and formic acid (Merck). For quantification
the internal standards oleic acid-d9 (FA 18:1-d9), LPC 19:0, PC 11:0/11:0, GABA-d2, Acetylcholine-d9, Glucose-d2, and Cell Free Amino Acid Mixture-15N (Sigma-Aldrich) were prepared in MeOH:H2O (9:1)
with 0.1% formic acid (Tables S1 and S2). INS-1 cells were exposed to a solution contained 138 mM NaCl,
5.6 mM KCl, 1.2 mM MgCl2, 2.6 mM CaCl2, and
1, 3, or 20 mM d-glucose at pH 7.4 and room temperature.
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3

Synthesis and Characterization of Gold Nanoparticles

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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). HAuCl4·4H2O (99.9%), acetonitrile (99.9%), ethanol (99.7%) and methanol (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).
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