Related Experiment Video
Updated: Oct 3, 2026

Colorimetric Detection of Bacteria Using Litmus Test
Published on: September 17, 2016
Use of magnetic beads for Gram staining of bacteria in aqueous suspension
S P Yazdankhah1, H Sørum, H J Larsen
1Department of Pharmacology, Microbiology and Food Hygiene, Norwegian School of Veterinary Science, P.O. Box 8146 Dep, N-0033, Oslo, Norway. siamak.p.yazdankhah@veths.no
Abstract:
A Gram staining technique was developed using monodisperse magnetic beads in concentrating bacteria in suspension for downstream application. The technique does not require heat fixation of organisms, electrical power, or a microscope. Gram-negative and Gram-positive bacteria were identified macroscopically based on the colour of the suspension. The bacteria concentrated on magnetic beads may also be identified microscopically.
Related Concept Videos
Special Staining Techniques
Differential Staining Technique
Other Unique Bacteria
Simple Staining Technique

