Answer / sunil tiwari

RS stands for related substance, means by-products upon
completion of reaction, or the unreacted portion present in
the product. RS testing help us to identify the adequate
quantitiy of these by-products or unreacted part.
More over RS help us during the stability study to know any
significant change in the nature of product during long
storage in various climatic conditions

Answer / kalyan

rs test is the related substance test which are performing
to known the impurities along with main substance.

which chromatographic technique is used for softening hard water?

1 Answers   Laurus,

---

Which buffer is used for LC/MS mobile phase & at What Conc.

3 Answers  

---

What are usp limits for total impurities,unknown impurity

1 Answers   Dr Reddys,

---

Difference Between End Cap HPLC Column and Non End Cap Column

2 Answers  

---

Difference between related substances & impurities

2 Answers   Biocon,

---

How can we calculates the solubility of the drug in different medias by injecting in to hplc????(solubility studies)

2 Answers   Super Pharmaceuticals,

---

how can u seperate polar compounds in hplc ?

1 Answers   Meditab, Piramal Healthcare,

---

why the ph scale range is 1 t0 14 and why not beyond 14 and not to below 1?

5 Answers   Avra, Granules, Orchid,

---

why IR graph or spectra comes down ? Any reason

4 Answers  

---

From peak purity spectrum, where or at which point peak purity angle & purity threshold is checked?

1 Answers   Cipla, MSN Pharma,

---

difference between precision & accuracy.

1 Answers   Laurus,

---

Which Zone of our country like conducting of Stability studies(Accelerated & Long term stability studies)as per ICH guidelines.

4 Answers  

---