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Protein Protocols Protein Protocols

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The Nitric Acid Method 35<br />

Fig. 3. Measurement of absorbance at 358 nm can be used to quantitate protein levels in<br />

samples treated with nitric acid. (A) Absorbance (at 358 nm) of varying concentrations of BSA<br />

incubated in nitric acid for 30 min, 4 h, 23 h, and 70 h. Inset, time-dependent increase of<br />

absorbance at 358 nm for a 1000 µg/mL solution of BSA dissolved in nitric acid. (B) Relationship<br />

between BSA concentration and absorbance at 358 nm for samples dissolved in electrophoresis<br />

sample buffer with or without 5% (v/v) β-mercaptoethanol. (C) Relationship between<br />

actual and measured BSA concentration in six blindly submitted BSA samples assessed by the<br />

nitric acid, BCA, and Bradford protein assays. Results in B and C represent the means of results<br />

from the assay of triplicate samples. Error bars (hidden by data points) represent ± 1 sample<br />

standard deviation.

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