I'm using isoflurane as the anaesthetic agent for my lab rats. The isoflurane provided by sigma is in mg form and I'm planning to dissolve it in ethanol (for drop jar method). But I'm not sure how many milligrams of isoflurane powder need to be dissolved in 100mL ethanol to give good anaesthetic effect. If anyone have prior experience with isoflurane powder, please advise me about the preparation. Thanks in advance