Biotechnology Procedures and Experiments Handbook

Appendix D: Chemicals Required for Microbiology Experiments

I. STAINING REAGENTS

Acid alcohol

Ethyl alcohol (95%)

97.0 mL

HCl

3.0 mL

Methylene blue

Methylene blue

.3 gm

Distilled water

100.0 mL

Capsule stain

Crystal violet (1%)

Crystal violet (85% dye content)

1.0 gm

Distilled water

100.0 mL

Copper sulphate solution (20%)

Coppersulfate (CuSO 4)

20.0 gm

Distilled water

80.0 mL

Fungal stains

Lactophenol-cotton blue solution

Lactic acid

20.0 mL

Phenol

20.0 gm

Glycerol

40.0 mL

Distilled water

20.0 mL

Aniline Blue

0.05 gm

Note

Heat gently to dissolve in hot water. Then add aniline blue dye.

Water-iodine solution

Grams iodine

10.0 mL

Distilled water

30.0 mL

Gram s stain

Crystal violet

Solution A

Crystal violet (90% dye content)

2.0 gm

Ethyl alcohol (95%)

20.0 mL

Solution B

Ammonium oxalate

0.8 gm

Distilled water

80.0 mL

Mix solutions A and B

Gram s iodine

Iodine

1.0 gm

Potassium iodide

2.0 gm

Distilled water

300 mL

Ethyl alcohol (95%)

Ethyl alcohol (100%)

95.0 mL

Distilled water

5.0 mL

Safranin

Safranin

0.25 mL

Ethyl alcohol (95%)

10.0 mL

Distilled water

100 mL

Negative stain

Nigrosin

Nigrosin, Water-soluble

10.0 gm

Distilled water

100 mL

Immerse in boiling water bath for 30 minutes.

Formalin

0.5 mL

Filter twice through double-filter paper.

Spore stain

Malachite green

Malachite green

5.0 gm

Distilled water

100 mL

Safranin

Safranin

0.25 mL

Ethyl alcohol (95%)

10.0 mL

Distilled water

100 mL

Acid-fast stain

Carbol fuchsin

Solution A

Basic fuchsin

0.3 gm

Ethyl alcohol (95%)

10.0 mL

Solution B

Phenol

5.0 mL

Distilled water

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