LDH Cytotoxicity Assay Kit

Is that cell toxicity assay accurate?

Results of cell number reduction by cell count reagent such as MTT or WST-8 assay do not show us if cells are dead or simply are not reproducing. However, because LDH cytotoxicity assay enables determination of cell death number, using cell count reagent along with cell toxicity assay more accurately determines on cell toxicity assay. It is not necessary to set up a special assay system; an absorption spectrometer is sufficient when using our cell count reagent kit and LDH cytotoxicity assay kit, which is a superior assay with low cost.
LDH: lactate dehydrogenase

Cell count reagent kit LDH Cytotoxicity Assay Kit
Enables determination of cell number reduction, but not cell death


Enables determination of cell death number


Assay of in-cell metabolic activity (Living cell assay)
● Cell Count Reagent SF (Wave range; 450 nm)
MTT Cell Count Kit (Wave range; 570 nm)
Assay of free-LDH activity (Dead cell assay)
LDH Cytotoxicity Assay Kit (Wave range; 490 nm)
Enables accurate evaluation of inhibition of cell proliferation or cell death.

LDH Cytotoxicity Assay Kit

This product is an assay kit for dead cells with damaged cell membranes.

  • Economical packaging size (100 and 500-test sizes available)
  • Ready-to-use
  • Storable at 4C for 3 months
  • By using cell suspension, enables unique assays with variety of other assays



This product detects free-LDH from cells with damaged cell membranes.

1. Dead cells with damaged cell membranes release LDH to cell culture medium. 2. Free-LDH in medium catalyzes the above reaction, then produces formazan, which has absorption with 490 nm.


● Add substrate to collected cell suspension ● Add substrate solution directly to cell culture plate
Because of cell suspension as sample, combination
with other assays are available.
Easy handling; add substrate solution to micro-well plate

When using with cell proliferation assay kit, pipet 100 ul of cell suspension up at first, then conduct cytotoxicity assay in another micro-well plate. Cells in the original micro-well plate can be used for cell proliferation assay.


Cell damage assay with melittin


Add represented concentration of melittin to 24-hour-cultured B16/BL6 cell (1 x 104 cells/well), then assay after 30-minute incubation. Substrate solution was directly added to each micro well. The higher concentration of melittin added, the stronger cell toxicity observed.

Date courtesy of Dr. Takuma Yamashita, Department of Biopharmaceutics and Drug Metabolism, Kyoto University

Ordering Information

Product Name Storage Catalog Number PKG Size Price
LDH Cytotoxicity Assay Kit Freeze 18250-64 100 tests e-Nacalai
18250-35 500 tests

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