Active Carboxylesterase 1 (CES1)

ACAT; CEH; CES2; HMSE1; PCE1; SES1; TGH; Retinyl ester hydrolase; Serine esterase 1; Triacylglycerol hydrolase; Egasyn; Cocaine carboxylesterase; Liver Carboxylesterase 1


Carboxylesterase 1 (CES1) also known as liver carboxylesterase 1 is a serine esterase and member of a large multigene carboxylesterase family. The protein Involved in the detoxification of xenobiotics and in the activation of ester and amide prodrugs. Hydrolyzes aromatic and aliphatic esters, but has no catalytic activity toward amides or a fatty acyl-CoA ester. Hydrolyzes the methyl ester group of cocaine to form benzoylecgonine. Thus, the recombinant mouse CES1 activity was measured by its ability to hydrolyze 4-Nitrophenyl acetate (4-NPA) to 4-Nitrophenol. The reaction was performed in 50mM Tris, pH 7.5 (Assay Buffer), ainitiated by addition 50μL of various concentrations of CES1 (dilute by Assay Buffer) to 50µL of 2mM Substrate 4-NPA (100mM stock in Acetone, dilute by deionized water). Incubated at 37℃ for 10min, then read at a wavelength of 400nm. One unit of enzyme activity is defined as the 1μg of enzyme required to convert 1pmol of 4-Nitrophenyl acetate to 4-Nitrophenol in 1min at 37°C. The specific activity of recombinant mouse CES1 is 1648 pmol/min/µg.
Specific Activity (pmol/min/µg)= △OD=Adjusted for Substrate Blank
F=Conversion Factor(convert from standard curve of 4-Nitrophenol)
T= Time
N=Amount of enzyme
Figure. The standard curve of 4-Nitrophenol


Reconstitute in 20mM Tris, 150mM NaCl (pH8.0) to a concentration of 0.1-1.0 mg/mL. Do not vortex.


Avoid repeated freeze/thaw cycles. Store at 2-8°C for one month. Aliquot and store at -80°C for 12 months.


The thermal stability is described by the loss rate. The loss rate was determined by accelerated thermal degradation test, that is, incubate the protein at 37°C for 48h, and no obvious degradation and precipitation were observed. The loss rate is less than 5% within the expiration date under appropriate storage condition.



Catalog No. Related products for research use of Mus musculus (Mouse) Organism species Applications (RESEARCH USE ONLY!)
APC374Mu01 Active Carboxylesterase 1 (CES1) Cell culture; Activity Assays.
RPC374Mu01 Recombinant Carboxylesterase 1 (CES1) Positive Control; Immunogen; SDS-PAGE; WB.
PAC374Mu01 Polyclonal Antibody to Carboxylesterase 1 (CES1) WB; IHC; ICC; IP.