"collected filtrate" is correct and can be used in written English.
It is a noun phrase that describes the liquid that is collected after it has been filtered. Example: After the experiment, the scientist carefully poured the collected filtrate into a beaker for further analysis.
The collected filtrate was centrifuged for 20 min at 20,000 × g at 4°C.
Cell debris was then filtered out using a Whatman No.1 filter paper and the collected filtrate was concentrated by using an Eyela rotary evaporator N-1000 until a volume of about 10 mL.
The collected filtrate was evaporated under vacuum at 50°C to drive away alcohol.
The collected filtrate was concentrated and freeze-dried affording a white solid, 2.07 g (84%).
The collected filtrate was concentrated and purified by chromatography eluting the silica with MeOH 0→5% in DCM.
All collected filtrates were concentrated to approximately 1 mL on a rotary evaporator at 45 °C, and further dried under a stream of nitrogen.
After 48 hours, the vector containing supernatants were collected, filtrated (0.45 µm filter, Sartorius, Göttingen, Germany), concentrated by ultracentrifugation (125,000 x g, 2 h, 4°C) through a 20% sucrose cushion and subsequently stored at −80°C.
The medium was then collected, filtrated to remove cell debris, and stored at -20°C until use.
The collected filtrates were evaporated in vacuo using a rotary evaporator (Stuart RE: 300) at 20°C.
Collected filtrates were analyzed for vault concentration using BCA, while AMB concentration was assayed using the previously mentioned known molar extinction coefficient using a Nanodrop 1000 (Thermo Scientific).
The virus containing medium was collected, filtrated with 0.4 μm Super Membrane Syringe Filter (Pall Corporation), concentrated by VIVASPIN 20 with membrane 50,000 MWCO PES (sartorius sedim biotech) and used for infection of the LNCaP cells.
