Trizol protocol I am using, provides good total RNA concentration and quality but the miRNA spike (Cel-miR39) is not being amplified in qPCR.
Starting volume: 600microlitre Plasma
Elution: 40microlitre
Sample1 260/280 Ratio: 2.04 Yield: 81.6ng/ml
Sample2 260/280 Ratio: 2.03 Yield: 61.3ng/ml
Sample3 260/280 Ratio: 2.04 Yield: 129.4ng/ml