An OAD L9(3)4 test design was employed where pressure, temperature,
the flow rate of methanol as a modifier and the flow rate
of CO2 were considered to be the four major factors for effective
extraction. Combinations of the three different levels of each factor
were listed in Table 1. In each test, 6.500 g dried stroma of Cordyceps
kyushuensis were shattered to powder (60–80 mesh) and placed
into the extraction vessel. After 45 min of static extraction (no liquidflow), the sample was subjected to dynamic extraction by flowing
CO2 at a set rate for 2 h.