A. Bradford
B. Biuret
C. Lowry
Choose the correct answer from the options given below :
Protein Detection Techniques Sensitivity Ranking
This analysis ranks the Biuret, Lowry, and Bradford protein detection techniques based on their increasing sensitivity.
Understanding Assay Sensitivity
Sensitivity in protein assays refers to the lowest concentration of a substance that can be measured reliably. The techniques differ significantly in this regard.
Biuret Assay
The Biuret assay detects peptide bonds. It requires high protein concentrations, generally in the range of milligrams per milliliter (mg/mL), making it the least sensitive method among the three.
Lowry Assay
The Lowry assay enhances sensitivity by reacting with aromatic amino acid residues (like tyrosine and tryptophan) in addition to peptide bonds. It can typically detect proteins in the range of micrograms per milliliter (µg/mL), offering moderate sensitivity.
Bradford Assay
The Bradford assay uses Coomassie Brilliant Blue G-250 dye, which binds to proteins changing the dye's absorbance maximum. It is generally considered more sensitive than the Lowry assay, also detecting proteins in the µg/mL range, and is often preferred for its speed.
Sensitivity Comparison Table
| Technique | Letter Code | Typical Sensitivity Range | Relative Sensitivity |
|---|---|---|---|
| Biuret | B | mg/mL | Low |
| Lowry | C | µg/mL | Medium |
| Bradford | A | µg/mL | High |
Order of Increasing Sensitivity
Based on the comparison, the techniques ordered by increasing sensitivity are:
- Biuret (B)
- Lowry (C)
- Bradford (A)
This corresponds to the sequence B, C, A.
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