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Related Experiment Video

Updated: May 29, 2026

Measuring Intracellular Ca2+ Changes in Human Sperm using Four Techniques: Conventional Fluorometry, Stopped Flow Fluorometry, Flow Cytometry and Single Cell Imaging
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Improved method for measuring intracellular Ca++ with fluo-3.

G T Rijkers1, L B Justement, A W Griffioen

  • 1Department of Immunology, University Hospital for Children and Youth, Het Wilhelmina Kinderziekenhuis, Utrecht, The Netherlands.

Cytometry
|January 1, 1990
PubMed
Summary

Flow cytometry measurements of intracellular calcium using fluo-3 are improved by using SNARF-1. This dual-dye method corrects for variations in dye uptake, enhancing the accuracy of calcium measurements.

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Area of Science:

  • Cellular Biology
  • Biochemistry
  • Analytical Chemistry

Background:

  • Flow cytometry is crucial for analyzing intracellular calcium ([Ca2+]i) levels.
  • Fluo-3 fluorescence intensity can vary due to differences in dye uptake and compartmentalization, affecting measurement accuracy.
  • Heterogeneity in basal fluorescence intensity compromises reliable [Ca2+]i detection.

Purpose of the Study:

  • To develop a more accurate method for measuring intracellular calcium using flow cytometry.
  • To overcome the limitations of fluo-3 based measurements caused by variable dye uptake.
  • To establish a sensitive parameter for [Ca2+]i changes.

Main Methods:

  • Simultaneous loading of cells with fluo-3 and SNARF-1.
  • Collecting SNARF-1 fluorescence at approximately 600 nm.
  • Analyzing the linear relationship between fluo-3 and SNARF-1 fluorescence signals.

Main Results:

  • SNARF-1 fluorescence intensity remained stable during cell activation.
  • A linear relationship was observed between fluo-3 and SNARF-1 fluorescence.
  • The ratio of fluo-3 to SNARF-1 fluorescence significantly reduced variations from fluo-3 uptake heterogeneity.

Conclusions:

  • The ratio of fluo-3 to SNARF-1 fluorescence provides a more accurate measure of intracellular calcium.
  • This dual-dye approach enhances the sensitivity and reliability of flow cytometric [Ca2+]i measurements.
  • The method effectively corrects for variations in dye loading and compartmentalization.