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Copper Iodide Staining of <strong>Protein</strong>s 385<br />

Table 1<br />

Comparison of the Detection Limits (in ng/1µL) of <strong>Protein</strong> Stains a<br />

Stain Nitrocellulose PVDF Nylon Silica Cellulose<br />

SECS 0.01 0.071 1 5 0.02<br />

Copper iodide 0.04 0.014 5 20 0.04<br />

Kinetic silver staining b 40 None 300 70 0.01<br />

Coomassie c 9 150 None 40 300<br />

Eu metal chelate d 9 150 2000 70 150<br />

a Two-fold serial dilutions of bovine albumin were dotted in 1-µL spots on the indicated<br />

support, then dried, stained, and evaluated visually.<br />

b Performed as described in Chapter 9.<br />

c Performed as described in ref. 8.<br />

d Performed as described in ref. 9. The Eu metal chelate stain was visualized over a UVP<br />

(Upland, CA) 302 nm UV transilluminator. When spots were excised and quantified by<br />

time-resolved fluorescence in an SLM Aminco Bowman II spectrometer, a detection limit of<br />

3 ng/1 µL was observed on nitrocellulose consistent with reported values (9).<br />

11. If there is a problem with static repulsion and transmission densitometry will be used, the<br />

Household 3-in-one oil (Subheading 3.3., step 6) may be first applied to the microtiter<br />

plate well to release the static charge.<br />

12. Quantitative measurements of copper iodide staining should be done at least in triplicate<br />

because of the relatively high (10–15%) standard deviation of the results.<br />

References<br />

1. Jenzano, J. W., Hogan, S. L., Noyes, C. M., Featherstone, G. L., and Lundblad, R. L.<br />

(1986) Comparison of five techniques for the determination of protein content in mixed<br />

human saliva. Analyt. Biochem. 159, 370–376.<br />

2. Lowry, O. H., Rosebrough, N. J., Farr, A. L., and Randall, R. J. (1951) <strong>Protein</strong> measurement<br />

with the Folin phenol reagent. J. Biol. Chem. 193, 265–275.<br />

3. Smith, P. K., Krohn, R. I., Hermanson, G. T., Mallia, A. K., Gartner, F. H., Provenzano,<br />

M. D., et al. (1985) Measurement of protein using bicinchoninic acid. Analyt. Biochem.<br />

150, 76–85.<br />

4. Root, D. D. and Reisler, E. (1989) Copper iodide staining of protein blots on nitrocellulose<br />

membranes. Analyt. Biochem. 181, 250–253.<br />

5. Root, D. D. and Reisler, E. (1990) Copper iodide staining and determination of proteins<br />

adsorbed to microtiter plates. Analyt. Biochem. 186, 69–73.<br />

6. Talent, J. M., Kong, Y., and Gracy, R. W. (1998) A double stain for total and oxidized<br />

proteins from two-dimensional fingerprints. Analyt. Biochem. 263, 31–38.<br />

7. Sapan, C. V., Lundblad, R. L., and Price, N. C. (1999) Colorimetric protein assay techniques.<br />

Biotechnol. Appl. Biochem. 29, 99–108.<br />

8. Christian, J. and Houen, G. (1992) Comparison of different staining methods for<br />

polyvinylidene difluoride membranes. Electrophoresis 13, 179–183.<br />

9. Lim, M. J., Patton, W. F., Lopez, M. F., Spofford, K. H., Shojaee, N., and Shepro, D.<br />

(1997) A luminescent europium complex for the sensitive detection of proteins and nucleic<br />

acids immobilized on membrane supports. Analyt. Biochem. 2, 184–195.

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