i will use this water to prepare stock solution of my pepptide and when i red papers i found that they dissolve this peptide in milli-q water so i asking if i can use water for injection instead milli-q water
route of adminstration of this pepptide is intraprotineal
Milli-Q is a trademark of Millipore Corporation to describe 'ultrapure' water of "Type 1", filtrated and deionized. It differs from plain tab water in purity. I would always prefer to use such a purified water, if available, to make stocks.
In addition to Dr. Wittman's answer above, there are water purifying systems that purify water to the same quality as Milli-Q systems. Barnstead, Thermo-Fisher, and others produce such systems. One hint you have such a system in your lab is the water resistance is greater than 18 mOhms/cm. There are also other criteria such as levels of sodium, silica, and organic materials in type 1 water, but one needn't use a Milli-Q system to make type 1 water. I, too, would use such water for stocks.
thanks dr christoph wittmann and jack silver
but can you tell me from which company i can buy 50 ml milli-q water,i am from egypt,thanks in advance
Milli-Q and other systems are purification systems for your lab. You don't buy Milli-Q water, one buys a purification system. If you have another brand of water purification system, you may use it instead. If you have no water purification system available, you may be able to use LC-MS grade water instead and that can be purchased from scientific supply houses.
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