Cryogenic milling, or cryomilling, is a technique used to process decellularized tissue specimens by cooling them to extremely low temperatures and grinding them into a fine powder. This method preserves the biochemical composition of the tissue while achieving a uniform particle size distribution.
Cryogenic milling or cryomilling is a technique that allows decellularized tissue specimens to be cooled to extremely low temperatures and ground to a fine powder while retaining their biochemical composition.
To begin, obtain a lyophilized tissue-derived decellularized extracellular matrix or ECM of interest. Mince it to obtain small fragments.
Next, transfer the minced ECM fragments into a milling jar. Introduce milling balls into the milling jar. Immerse the loaded milling jar in liquid nitrogen to freeze the sample at −196 °C.
Load the cooled jar into a cryomilling system. Subject the frozen sample to cryomilling at an appropriate frequency for the desired duration.
During cryomilling, the milling jar oscillates radially in the horizontal position. In consequence, the inertia of the milling balls facilitates them to impact the frozen sample with high energy at the rounded ends of the jar and pulverize it.
Additionally, the movement of the milling jar coupled with the motion of the milling balls promotes intensive mixing of the sample to obtain a fine powder with uniform particle size distribution.
Now, transfer the cryomilled ECM powder into a glass vial. Seal the vial tightly to prevent exposure to moisture. Desiccate the sample until further use.
Use sharp surgical scissors to finely mince the decellularized tissue. To cryomill the processed tissue, fill a 25-milliliter stainless steel milling chamber for a laboratory ball mill system with minced lyophilized ECM and add two 10-millimeter stainless steel milling balls.
Close and completely submerge the loaded milling chamber in liquid nitrogen for 3 minutes. Then, mill the frozen sample at 30 hertz for 3 minutes. Repeat the submersion in liquid nitrogen and the milling until the ECM is milled into a fine powder.
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