Frequently Asked Questions

The term impurity reflects unwanted chemicals that are present in APIs or that develop during formulation or upon aging of the API in the formulated drug product. The presence of such unwanted material, even in small amounts, could affect the efficacy and safety of pharmaceutical products.

Retention Time. Retention time (RT) is a measure of the time taken for a solute to pass through a chromatography column. It is calculated as the time from injection to detection. The RT for a compound is not fixed as many factors can influence it even if the same GC and column are used.

Relative retention time (RRT) is the ratio of the retention time of analyte peak relative to that of another used as a reference, obtained under identical conditions.

Relative response factor is the ratio of the response of the impurity and the active pharmaceutical ingredient (API) under the identical chromatographic conditions (chromatographic column, temperature, mobile phase, flow rate etc)

A mass spectrum is a plot of the ion signal as a function of the mass-to-charge ratio. These spectra are used to determine the elemental or isotopic signature of a sample, the masses of particles and of molecules, and to elucidate the chemical identity or structure of molecules and other chemical compounds.

Nuclear magnetic resonance spectroscopy is widely used to determine the structure of organic molecules in solution and study molecular physics, crystals as well as non-crystalline materials. NMR is also routinely used in advanced medical imaging techniques, such as in magnetic resonance imaging (MRI)

A Reference Standard is a highly characterized, standardized and validated reference material. They enable the measurement of the sensitivity, specificity and accuracy of your assay or workflow.

A reference standard (i.e., primary standard) may be obtained from the USP/NF or other official sources (e.g., CBER, 21 CFR 610.0). A working standard (i.e., in-house or secondary standard) is a standard that is qualified against and used instead of the reference standard.

It is a highly characterized specimen of drug substances, excipients, reportable impurities, degradation products, compendia reagents, and performance calibrators used for generation of working standard or directly used for quantification process.

Potency is the dose of drug required to produce a specific effect of given intensity as compared to a standard reference. Potency is a comparative rather than an absolute expression of drug activity.

Purity can be defined as the absence of any impurities - or types of matter other than the substance itself. You can use numerous tests to check for purity, ranging from simple visual comparison to sophisticated laboratory techniques.

Thermogravimetric analysis (TGA) is an analytical technique used to determine a material's thermal stability and its fraction of volatile components by monitoring the weight change that occurs as a sample is heated at a constant rate.

It is ‘Certificate of Analysis’ which consists all technical information of particular batch product.

Different Glass & Plastic vials as per material nature.

You can simply search with impurity name, CAS number or catalogue number on our website. Moreover, you can also browse the products as per categories and sub-categories list.

In such cases our ‘Custom Synthesis’ service is always available for you. We can synthesize the product as per your requirement. Please send online enquiry or just email us with product details and requirements. We will get back to you with availability / lead time and quote. You need to send us the order/Purchase Order. You need to pay only when it’s ready or as per terms and conditions as agreed.

Generally custom synthesis products would be shipped in the in 3-6 weeks (as per difficulty level or the product and time mentioned in quote).

Using online Enquiry form: You can add the products to enquiry list using ‘Enquiry’ Button of the products then go to Enquiry page, fill the form and send it. Email: You can send us the email with your requirement.

VEEPRHO always update stock status of all products. If the product is in our stock, we can ship / dispatch the product in 48 hrs after successful quality control check. For some reasons, we can’t keep stock of all products. Please send us online enquiry or email us.

In general, our products have purity >95 %. Each product undergoes strict quality control check. We study various parameters using HPLC, 1H NMR, Mass, TGA, IR physical constant etc. Each product you get ‘Certificate of Analysis’ (CoA) mentioning purity and other relevant information.

With product, we provide CoA, 1H NMR, Mass and HPLC purity. On request, we also provide other data (like IR, TGA etc.) as per your requirement.

Please send us an email with your requirement. We will send additional data either free or cost or with small charges.

Yes, we can provide after sales support. If you are facing any problems or need any additional information about our products, please write us – sales@veprho.com, our scientific / technical team will contact you.

You can send us email with the reason / issues which are facing within 15 days after receipt the product. We will try to solve the issue with our after-sales service commitment. We can replace the product or return the payment, depending on reason / issues.

R & D chemicals / materials are very important to handle and store carefully. So, it is always better to take precaution while storing of such materials. Generally, we recommend 2-8°C temperature for long term storage (more than 15 days) under (Nitrogen or Argon gas) inert atmosphere for most of the material. Please follow the storage conditions given in the CoA for a specific product / material.