Human CLS (Cardiolipin Synthase) ELISA Kit (HUES01811)

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ELISA Kit Technical ManualMSDS

Human CLS (Cardiolipin Synthase) ELISA Kit

This ELISA kit uses Sandwich-ELISA as the method. The micro ELISA plate provided in this kit has been pre-coated with an antibody specific to Human CLS . Standards or samples are added to the appropriate micro ELISA plate wells and combined with the specific antibody. Then a biotinylated detection antibody specific for Human CLS and Avidin-Horseradish Peroxidase (HRP) conjugate are added to each micro plate well successively and incubated. Free components are washed away. The substrate solution is added to each well. Only those wells that contain Human CLS, biotinylated detection antibody and Avidin-HRP conjugate will appear blue in color. The enzyme-substrate reaction is terminated by adding Stop Solution and the color turns yellow. The optical density (OD) is measured spectrophotometrically at a wavelength of 450 nm ± 2 nm. The OD value is proportional to the concentration of Human CLS. The concentration of Human CLS in samples can be calculated by comparing the OD of the samples to the standard curve.

Assay typeSandwich
Assay time4.5h
Detection MethodColormetric
Detection Range1.56-100 ng/mL
Sensitivity0.94 ng/mL
Sample Volume Required Per Well100uL
Sample TypeSerum, plasma and other biological fluids


This kit recognizes Human CLS in samples. No significant cross-reactivity or interference between Human CLS and analogues was observed.

Typical Data

As the OD values of the standard curve may vary according to the conditions of the actual assay performance (e.g. operator, pipetting technique, washing technique or temperature effects), the operator should establish a standard curve for each test. Typical standard curve and data is provided below for reference only.

O.D Average Corrected


Intra-assay Precision (Precision within an assay): 3 samples with low, mid range and high level Human CLS were tested 20 times on one plate, respectively.

Inter-assay Precision (Precision between assays): 3 samples with low, mid range and high level Human CLS were tested on 3 different plates, 20 replicates in each plate.

Intra-assay Precision Inter-assay Precision
Mean (ng/mL)4.9213.5535.934.8114.7032.87
Standard deviation0.320.681.110.300.741.03
C V (%)6.505.


The recovery of Human CLS spiked at three different levels in samples throughout the range of the assay was evaluated in various matrices.

Sample Type Range (%) Average Recovery (%)
Serum (n=5)87-10192
EDTA plasma (n=5)85-9892
Cell culture media (n=5)87-10092


Samples were spiked with high concentrations of Human CLS and diluted with Reference Standard & Sample Diluent to produce samples with values within the range of the assay.

Serum (n=5) EDTA plasma (n=5) Cell culture media (n=5)
1:2Range (%)91-104100-11592-107
Average (%)9710699
1:4Range (%)92-10682-9483-98
Average (%)998690
1:8Range (%)91-10581-9382-95
Average (%)978688
1:16Range (%)89-10381-9481-94
Average (%)958688

Kit Components & Storage

An unopened kit can be stored at 4'C for 1 month. If the kit is not used within 1 month, store the items separately according to the following conditions once the kit is received.

Item Specifications Storage
Micro ELISA Plate(Dismountable)8 wells X12 strips-20'C, 6 months
Reference Standard2 vials
Concentrated Biotinylated Detection Ab (100X)1 vial, 120 uL
Concentrated HRP Conjugate (100X)1 vial, 120 uL-20'C(shading light), 6 months
Reference Standard & Sample Diluent1 vial, 20 mL4'C, 6 months
Biotinylated Detection Ab Diluent1 vial, 14 mL
HRP Conjugate Diluent1 vial, 14 mL
Concentrated Wash Buffer (25X)1 vial, 30 mL
Substrate Reagent1 vial, 10 mL4'C(shading light)
Stop Solution1 vial, 10 mL4'C
Plate Sealer5 pieces
Product Description1 copy
Certificate of Analysis1 copy

Human CLS (Cardiolipin Synthase) ELISA Kit (HUES01811) Assay procedure

    1. Set standard, test sample and control (zero) wells on the pre-coated plate and record theirpositions. It is recommended to measure each standard and sample in duplicate. Note: addall solutions to the bottom of the plate wells while avoiding contact with the well walls. Ensuresolutions do not foam when adding to the wells.
    2. Aliquot 100µl of standard solutions into the standard wells.
    3. Add 100µl of Sample / Standard dilution buffer into the control (zero) well.
    4. Add 100µl of properly diluted sample (serum, plasma, tissue homogenates and otherbiological fluids) into test sample wells.
    5. Cover the plate with the sealer provided in the kit and incubate for 90 min at 37°C.
    6. Aspirate the liquid from each well, do not wash. Immediately add 100µL of BiotinylatedDetection Ab working solution to each well. Cover the plate with a plate seal and gently mix.Incubate for 1 hour at 37°C.
    7. Aspirate or decant the solution from the plate and add 350µL of wash buffer to each welland incubate for 1-2 minutes at room temperature. Aspirate the solution from each well andclap the plate on absorbent filter paper to dry. Repeat this process 3 times. Note: a microplatewasher can be used in this step and other wash steps.
    8. Add 100µL of HRP Conjugate working solution to each well. Cover with a plate seal andincubate for 30 min at 37°C.
    9. Aspirate or decant the solution from each well. Repeat the wash process for five times asconducted in step 7.
    10. Add 90µL of Substrate Reagent to each well. Cover with a new plate seal and incubate forapproximately 15 min at 37°C. Protect the plate from light. Note: the reaction time can beshortened or extended according to the actual color change, but not by more than 30min.
    11. Add 50 µL of Stop Solution to each well. Note: Adding the stop solution should be done inthe same order as the substrate solution.
    12. Determine the optical density (OD value) of each well immediately with a microplate readerset at 450 nm.

Human CLS (Cardiolipin Synthase) ELISA Kit (HUES01811) Protein Information

UniProt Protein Function:CRLS1: Catalyzes the reversible phosphatidyl group transfer from one phosphatidylglycerol molecule to another to form cardiolipin (CL) (diphosphatidylglycerol) and glycerol. Belongs to the CDP-alcohol phosphatidyltransferase class-I family. 2 isoforms of the human protein are produced by alternative splicing.
UniProt Protein Details:

Protein type:EC 2.7.8.-; Lipid Metabolism - glycerophospholipid; Membrane protein, integral; Membrane protein, multi-pass; Mitochondrial; Transferase

Chromosomal Location of Human Ortholog: 20p12.3

Cellular Component: mitochondrial inner membrane; mitochondrion

Molecular Function:1-acylglycerol-3-phosphate O-acyltransferase activity; 2-acylglycerol-3-phosphate O-acyltransferase activity; cardiolipin synthase activity; CDP-diacylglycerol-phosphatidylglycerol phosphatidyltransferase activity

Biological Process: cardiolipin biosynthetic process

NCBI Summary:This gene encodes a member of the CDP-alcohol phosphatidyltransferase class-I family of proteins. The encoded enzyme catalyzes the synthesis of cardiolipin, a phospholipid component of mitochondrial membranes that is critical for mitochondrial function. [provided by RefSeq, Apr 2016]
UniProt Code:Q9UJA2
NCBI GenInfo Identifier:37537857
NCBI Gene ID:54675
NCBI Accession:Q9UJA2.1
UniProt Secondary Accession:Q9UJA2,Q27RP0, Q69YQ5, D3DW09, E9PAT4,
UniProt Related Accession:Q9UJA2
Molecular Weight:33kDa
NCBI Full Name:Cardiolipin synthase (CMP-forming)
NCBI Synonym Full Names:cardiolipin synthase 1
NCBI Official Symbol:CRLS1  
NCBI Official Synonym Symbols:CLS; CLS1; GCD10; C20orf155; dJ967N21.6  
NCBI Protein Information:cardiolipin synthase (CMP-forming)
UniProt Protein Name:Cardiolipin synthase (CMP-forming)
UniProt Synonym Protein Names:Protein GCD10 homolog
UniProt Gene Name:CRLS1  
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Additional Information

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