A new preparation for recording single-channel currents from skeletal muscle

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Abstract
Spherical vesicles of sarcolemma (median diameter, 78 .mu.m) were prepared from frog skeletal muscle by prolonged exposure to enzymes (collagenase, then protease) and to isotonic KCl solutions, which promote swelling of muscle fibers. Patch clamp recording was used to measure unitary K and Na currents from this preparation. Na and K channels had conductances around 15 pS [picoSiemans], and their kinetic properties appeared unaltered by vesicle formation.