A good rule of thumb is: 1  for difficult separations (Î´CV â¤ 1) use up to 100 g (~200 mL) of silica gel per gram of compound to be purified (1% load) 2  for normal separations (1 â¤ Î´CV â¤ 5) use from 20 to 90 g (~40-180 mL) of silica gel per gram of compound to be purified (2-9% load)
Typical costs: 1  According to the Academy of Managed Care Pharmacy , insulin pumps cost between $4,500 and $6,500 for individuals without insurance. The price varies depending upon the features, brand and size of the pump. 2  Some insurance plans will cover the cost of the pump.
If you have an insulin pump on the NHS, you may need to cover some of the costs which may include insurance, accessories and, in the case of some pumps, glucose sensors as well. The cost of insulin pumps is often between Â£2000 and Â£3000. NICE guidance in 2008 records the following costs of insulin pumps: Johnson & Johnson - Animas 2020 - Â£2600.