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Human LL-37(Antibacterial Protein LL-37) ELISA Kit
ELK8189
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48 T $320.00
96 T $458.00
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OverviewPublications

Product name: Human LL-37(Antibacterial Protein LL-37) ELISA Kit
Reactivity: Human
Alternative Names: CAP18; FALL39; HSD26; LL37; 18 kDa Cationic Antimicrobial Protein; Antibacterial protein FALL-39; FALL-39 peptide antibiotic; CAMP; Cathelicidin Antimicrobial Peptide
Assay Type: Sandwich
Sensitivity: 0.28 ng/mL
Standard: 50 ng/mL
Detection Range: 0.79-50 ng/mL
Sample Type: serum, plasma and other biological fluids
Assay Length: 3.5h
Research Area: Infection immunity;
Test principle: The test principle applied in this kit is Sandwich enzyme immunoassay. The microtiter plate provided in this kit has been pre-coated with an antibody specific to Human LL-37. Standards or samples are added to the appropriate microtiter plate wells then with a biotin-conjugated antibody specific to Human LL-37. Next, Avidin conjugated to Horseradish Peroxidase (HRP) is added to each microplate well and incubated. After TMB substrate solution is added, only those wells that contain Human LL-37, biotin-conjugated antibody and enzyme-conjugated Avidin will exhibit a change in color. The enzyme-substrate reaction is terminated by the addition of sulphuric acid solution and the color change is measured spectrophotometrically at a wavelength of 450nm ± 10nm. The concentration of Human LL-37 in the samples is then determined by comparing the OD of the samples to the standard curve.

Standard curve

Concentration (ng/mL) OD Corrected OD
50.00 2.054 1.971
25.00 1.587 1.504
12.50 1.027 0.944
6.25 0.866 0.783
3.13 0.509 0.426
1.57 0.335 0.252
0.79 0.228 0.145
0.00 0.083 0.000

Precision

Intra-assay Precision (Precision within an assay)：CV%<8%

Three samples of known concentration were tested twenty times on one plate to assess intra-assay precision.

Inter-assay Precision (Precision between assays)：CV%<10%

Three samples of known concentration were tested in forty separate assays to assess inter-assay precision.

Recovery

Matrices listed below were spiked with certain level of recombinant LL-37 and the recovery rates were calculated by comparing the measured value to the expected amount of LL-37 in samples.
Matrix Recovery range Average
serum(n=5) 82-94% 88%
EDTA plasma(n=5) 85-97% 91%
Heparin plasma(n=5) 82-94% 88%

Linearity

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of LL-37 and their serial dilutions. The results were demonstrated by the percentage of calculated concentration to the expected.
Matrix 1:2 1:4 1:8 1:16
serum(n=5) 87-98% 83-94% 85-98% 85-97%
EDTA plasma(n=5) 98-105% 92-101% 85-105% 87-98%
Heparin plasma(n=5) 85-92% 79-96% 89-100% 85-96%