Methylene blue is one of the most frequently used dyes in microbiology, chemistry, and medical laboratories. It is commonly applied in the staining of cells, detection of microorganisms and a number of biochemical experiments.
Due to its significance in lab activity, the ability to prepare a Methylene blue solution appropriately is a crucial for accurate results.
This guide will go through on how to prepare methylene blue solution in the laboratory, materials needed and calculations to be made.
What is Methylene Blue?
Methylene blue is an artificial dye that is a member of phenothiazine family. Physically, it looks like a dark green crystalline powder yet when it is dissolved in water, it turns a deep blue. Quite a surprise!
The following are the uses of Methylene blue:
- Simple staining of bacteria
- Detection of microorganisms
- Chemical experiment Redox indicator
- Staining of tissues and cells biologically
- Microbiology laboratory demonstration experiment
- Due to its high-water solubility, methylene blue solutions are not difficult to prepare.
Materials Required
- Methylene Blue (Dye content – 96%)
- Distilled water
- Conical flask
- Volumetric flask
- Analytical balance
- Filter Papers
NB: In my case I’m going to prepare 100ml of the methylene blue solution using a dye content of 96%.
Calculations and Measurements
1g of pure solute in 100ml of the solution is usually 1% pure. Since my dye content is 96% pure, I will have to adjust for the purity.
But first, let’s find the grams of the powered in the Methylene Blue.
If 1g = 100%
Y? = 96%
96% x 1g/100 = 0.96g
1g powder contains 0.96g pure Methylene Blue
X? = 1g of Methylene Blue Powder
0.96X = 1g
X = 1/0.96 = 1.04g
Step-by-Step Procedure
N/B: One of the most common concentrations used in microbiology laboratories is the 1% methylene blue solution.
In our case, we will be going to make 100ml of the Methylene blue solution.
Procedure will be: Weigh and dissolve 1.04g of the Methylene blue in 75ml of the distilled water and then dilute it to 100ml. Filter the solution to remove the undissolved particles. Finally label and store the stain in reagent bottles. Include the following details on the label:
- Name: Methylene Blue Solution
- Concentration: 1%
- Date of preparation
- Prepared by:
We have a tutorial on how to prepare Methylene blue solution in the laboratory. Watch the tutorial to have a better visual understanding of the same.
Conclusion
Preparing a methylene blue solution in the laboratory is an essential laboratory practices that require being precise. This starts when doing the weighing of Methylene blue and the distilled water. Adjusting the amount of your dye content is necessary too.
Therefore, understanding how to prepare the stain is an important skill for students, researchers and lab techs. Filtering can also be done to make the stain more accurate.