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Free-flow electrophoresis is a fast and promising method for gamete separation. Pretreated seminal plasma-free human spermatozoa were injected continuously as a fine stream into the buffer medium of the separation chamber flowing perpendicular to the forces of an electrical field, which separated the spermatozoa according to their differences in electrophoretic mobility. For characterization of the two classes of spermatozoa before and after separation, quinacrine mustard staining was used to identify the Y-chromosome-bearing spermatozoa carrying the fluorescent body (F-body). Human spermatozoa moved toward the anode and were separated into two main peaks. The faster moving fraction contained nearly 80% Y-bearing spermatozoa and the slower peak consisted mainly of pure X-bearing spermatozoa. Whereas sperm viability as determined by eosin staining was nearly unchanged, sperm motility was reduced after free-flow electrophoresis.
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