Use of reflectance in soft laser densitometry in scanning opaque electrophoregrams. A high-resolution technique.

The present report describes a new approach in soft laser scanning densitometry performed on opaque electrophoregrams. The method employs a light reflectance system instead of absorption, which is commonly used. The data of this preliminary study were obtained by directly scanning a photograph of an electrophoregram exhibiting viral proteins separated by SDS-PAGE. Comparison of the two methods clearly demonstrate that laser reflectance offers finer resolution than laser absorbance when opaque materials are scanned.