After that, samples were centrifuge

After that, samples were centrifuged at 500 rpm for 20 min and the supernatants obtained were then niltered prior to analysis.

ผลลัพธ์ (ไทย) 1:

Then it was centrifuged at 500 rpm for 20 minutes and the supernatants were then niltered before analysis.

ผลลัพธ์ (ไทย) 2:

The samples were centrifuged at 500 rpm for 20 min and supernatants were niltered before it is analyzed.

ผลลัพธ์ (ไทย) 3:

After the sample at 500 rpm for 20 min and supernatants were then niltered before analysis.