After screening the MCE compound library, how to confirm the purity and delivery time for purchasing validation spot goods?

Before placing an order, don't just look at the webpage displaying "in stock". Ask the business or technical support directly to confirm whether each item number is in stock in the domestic warehouse, whether the quantity meets the requirements, and whether it is shipped locally or needs to be transferred. For general domestic spot orders, the delivery time is usually 1-3 working days, and logistics is calculated separately; If there are obscure compounds in more than ten item numbers, one or two may slow down the entire order. It is recommended to request shipment in the same batch, or to verify the COA batch number and keep a sample after arrival to avoid difficulty in tracing activity results caused by replenishment and batch changes.

The unit prices of 5mg and 10mg are not good to generalize, depending on the specific product number, large packaging or promotion. The unit price of many catalog compounds 10mg will be lower than 5mg, but you should verify it now. It is recommended to buy 5mg first, and then consider supplementing the packaging after confirming the validity to avoid wasting more at one time. At the time of inquiry, let the sales report the stock status, production batch and delivery period of the same product numbers of 5mg and 10mg together. It is best to purchase more than a dozen compounds with uniform specifications to facilitate acceptance and subsequent comparison.

The HPLC purity on COA can be used as a reference, but it cannot completely replace self retesting, especially for the hit compounds screened from the library. After arrival, it is recommended to perform HPLC or LC-MS to confirm the molecular weight and main peak purity, and record the retention time, as storage and weighing processes may introduce errors. Some compounds have weak UV absorption, and using ELSD or LC-MS for COA is more reliable, depending on whether the method is specified. For enzyme activity validation, a small amount of high-purity impurities with strong activity can affect interpretation, so it is best to retest before conducting critical positive or dose-dependent experiments.