Does the usp standard have any purity? usp standard
Currently,USPSupplying more than 3300 standards, some USP standards for small quantities: 15 mg, 10 mg or even less. This is usually due to difficulties and challenges in obtaining large quantities of candidate powder substances, or due to the monograph method only a small number of standards are required. Since 2004, V-shaped bottom containers (i.e. pointed bottom bottles) have been used for the supply of most USP standards in small quantities (less than 10 mg). The use of such containers can facilitate the removal of powdered substances. The following recommendations will help to effectively remove small or large amounts of USP standard powder from the bottle, e.g. using standards in a room temperature environment, taking static control, etc.
In order to achieve the purpose of use of the standard, each USP standard must be properly stored, handled, and used.
1. Suitability for Use (Whether the standard product is suitable for use)
Users must confirm whether the standard product being used is the "current batch" or the "previous batch" within the effective use date. Information about batches can be found through the "Standard List and Catalog" on the official website.
The user must confirm the suitability of USP standards for use outside of the USP-National Formulary, Food Chemistry Codex, or Dietary Supplement Codex. Any other non-designated pharmacopoeia use is at the user's full risk and expense. USP standards are not used as drugs, dietary supplements, or medical devices.
2. Directions on the Label of the Reference Standard
Instructions for storage and use are provided on the label of each standard. These instructions are specific to the specified batch and take precedence over other instructions in the corresponding documentation standard. Labels include safety warnings, information required for controlled substances, and calculated values applied to quantitative standards. Acceptable ranges are provided for substances used for calibration. When necessary, technical data tables are attached to USP standards when they are shipped. New standard label format information was published in April 2014. Please send the number 1 on WeChat for details.
3. Directions in USP-NF (instructions in USP-NF)
Please refer to the list of modifications, additions, and deletions of USP standards in the effective version of the USP-NF. USP standards required for assays and tests specified in individual USP or NF monographs. USP-NF General Principles < 11 > USP Reference Materials provide more information on proper use and storagestandardInformation and guidance.
4.Storage (storage)
Make sure USP standards are stored in their original sealed container, protected from high temperatures and humidity and protected from light. Follow instructions on product labels. (See the USP Standards Storage and Use Policy Statement).
5. Weighing (weighing)
Ensure accurate weighing of standards - When quantitative testing requires the preparation of standard solutions, etc., the potential for relatively large deviations when weighing values are small should be considered. See USP-NF General Principles < 41 > Weighing and Balancing < 31 > Volume Instruments, and for more information, see the USP-NF General Conditions section on Rational Use of USP Standards.
6. Drying (dry)
When USP standards are required to be dried before use, use clean and dry utensils as drying vessels - rather than original containers.
2) Ensure that the standard is not repeatedly dried above 25 degrees Celsius.
3) Comply with the drying requirements specified in the label of the standard product or in a section of the monograph. (Note the specific instructions on the label or replace the general instructions under the test and determination item of USP-NF in the monograph).
4) When the standard used needs to be titrated, the provisions of USP-NF General Rule < 921 > Method 1 for moisture determination should be followed. Instrumental or microanalytical methods are acceptable. Usually about 50mg of standard is used, and the titration solution is diluted 4 times.
