The quotes are about different experimental conditions: 1) pure epinephrine (which returned only 87% pure) and 2) EpiPen solution (which starts out with less th

The quotes are about different experimental conditions: 1) pure epinephrine (which returned only 87% pure) and 2) EpiPen solution (which starts out with less than 100% epinephrine and apparently returned with an amount below the detection threshold) Probably some other ingredient of the EpiPen solution reacted with the epinephrine, causing it to degrade faster than the pure stuff.