Ultracentrifugation protocols are tedious, time consuming, and result in only partially purified retrovirus. Our ViraBind™ PLUS Retrovirus Concentration & Purification Kits provide a much simpler, faster way to obtain high titer retrovirus with greater purity. Each prep can process up to 50 mL of retrovirus supernatant in our standard kit and 500 mL in our Mega kit.