Pretreatment and detection method of biogenic amine neurotransmitter, and detection kit
A technology for neurotransmitters and biogenic amines, applied in the field of detection, can solve the problems of complicated steps, interference of mass spectrometry signals, and reduced recovery rate, and achieve the effects of avoiding instability, high sensitivity, and rapid determination
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Embodiment 1
[0098] Example 1: Determination of biogenic amine neurotransmitters and their metabolites (1)
[0099] 1. Reagents and materials used:
[0100] Rat blank brain tissue homogenate: the rat was decapitated, the skull was carefully cut and the brain tissue was taken out. Accurately weigh rat blank brain tissue, add 9 times the volume of 10 mM ascorbic acid aqueous solution, and use a high-speed homogenizer to homogenize to obtain a 10% rat blank brain tissue homogenate.
[0101] Internal standard solution: acetaminophen solution diluted in acetonitrile.
[0102] Neurotransmitter standard solution: prepared by adding 10 mM ascorbic acid aqueous solution to the biogenic amine neurotransmitter standard. Wherein, biogenic amine neurotransmitter standard products were purchased from Sigma Company.
[0103] Sodium carbonate-sodium hydroxide buffered saline, and 1 mg / mL p-dimethylaminobenzenesulfonyl chloride in acetonitrile.
[0104] Wherein, p-dimethylaminobenzenesulfonyl chlorid...
Embodiment 2
[0137] Example 2: Stability study of biogenic amine neurotransmitters and their derivatized products
[0138] 1. Experimental method:
[0139] Investigate the stability of various biogenic amine neurotransmitters and their metabolites in different pH media and other conditions, and the stability of biogenic amine neurotransmitter derivative products.
[0140] Accurately weigh biogenic amine neurotransmitters or their metabolites, and prepare a 1 mg / mL solution with 10 mM ascorbic acid aqueous solution. Dilute with 1% formic acid (pH=1), 10mM ammonium acetate (pH=5) and artificial cerebrospinal fluid (pH=7.4) respectively, so that the concentrations are 10ng / mL, 100ng / mL and 1000ng / mL or 40ng / mL, 400ng / mL and 4000ng / mL. The sample was placed at 37° C., 50 rpm, and heated for 0, 2, 4, 8, 16 and 24 hours respectively to terminate the heating. Take each sample and derivatize biogenic amine neurotransmitters or their metabolites according to the method in Example 1, place the ...
Embodiment 3
[0148] Example 3: Determination of biogenic amine neurotransmitters and their metabolites (2)
[0149] 1. Determination method:
[0150] Referring to the assay method of Example 1.
[0151] The difference is that the derivatization reagent solution uses benzenesulfonyl chloride in acetonitrile solution with a concentration of 1 mg / mL. The ion pairs and mass spectrometry conditions corresponding to the quantitative analysis of biogenic amine neurotransmitters and their metabolites are shown in Table 6.
[0152] Table 6
[0153]
[0154]
[0155] 2. Measurement results:
[0156] 2.1 Draw a standard curve:
[0157] Accurately weigh the solid powders of sodium chloride, potassium chloride, calcium chloride, magnesium chloride, disodium hydrogen phosphate and 4-hydroxyethylpiperazineethanesulfonic acid (HEPEs) into 1L of double-distilled water, shake and dissolve, so that they contain 147mmol / L sodium chloride, 3mmol / L potassium chloride, 1.2mmol / L calcium chloride, 1....
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