To Review “RP-HPLC Method Development and Validation of Upadacitinib (UDB) And Tofacitinib (TFC) In Bulk and Pharmaceutical Dosage Form

Pharmaceutical analysis is a branch of chemistry which deals not only with medicaments (drugs and their formulations) but also with their precursors i.e. with the raw material on which degree of purity and quality of medicament depends. The quality of the drug is determined after establishing its authenticity by testing its purity and the quality of pure substance in the drug and its formulations There are various methods which are used to study the physical phenomenon that occurs as a result of chemical reactions. The most important methods are:

Optical Method:

1. Refractometry
2. Polarimetry
3. Emission
4. Fluorescence methods of analysis
5. Nephelometry or Turbidimetry
6. Photometry including Photo-Colorimetry
7. Spectrophotometry covering UV-Visible.

RP-HPLC method development is a systematic process of optimizing stationary phase chemistry (commonly mobile phase composition (polar solvents like methanol/acetonitrile), pH, and flow rate to achieve efficient separation, identification, and quantification of analytes. The goal is to maximize resolution and minimize analysis time.

AbbVie's Rinvoq, formerly known as Upadacitinib, received FDA approval in 201 9 for the treatment of moderate to severe RA. Upadacitinib, with an IC50 value of 43 nM, is a potent and selective JAK1 inhibitor that can be taken orally and has demonstrated effectiveness [66]. Cellular experiments that relied on specific, pertinent cytokines, demonstrated a selectivity of around 74 times for JAK1 compared to JAK2 (with a potency of 200 nM). Additionally, it exhibited a selectivity of approximately 58 times for JAK1 over JAK3, which is involved in immunosurveillance [66–68]. The improved selectivity of Upadacitinib for JAK1 in comparison to JAK2 and JAK3 has the potential to enhance the benefit-risk profile for patients with RA [69]. The indications currently approved for Upadacitinib include not only RA, but also non-radiographic axial.

spondyloarthritis, UC, AD, ankylosing spondylitis, and PA. Indications in the clinical trial phase include Crohn's disease, vasculitis, vitiligo, and systemic lupus erythematosus.

Upadacitinib (Rinvoq) and Tofacitinib (Xeljanz) are both oral Janus kinase (JAK) inhibitors used for autoimmune conditions like ulcerative colitis (UC) and rheumatoid arthritis.

Tofacitinib:  (brand name Xeljanz) is an oral, targeted synthetic DMARD and Janus kinase (JAK) inhibitor approved for adults with moderate-to-severe active rheumatoid arthritis (RA) who have had an inadequate response or intolerance to at least one DMARD. It effectively reduces joint pain, swelling, and radiographic progression, often used when methotrexate or TNF blockers fail, either as monotherapy or in combination with methotrexate.

• Mechanism of Action: As a selective inhibitor of Janus kinases (specifically JAK1 and JAK3), tofacitinib blocks the intracellular signaling pathway of pro- inflammatory cytokines, distinguishing it from conventional biologic medicines.
• Administration: Typically taken orally (5 mg twice daily or 1 1 mg extended-release once daily).
• Efficacy: Clinical trials (ORAL series) demonstrated superior or comparable results to methotrexate and adalimumab in reducing symptoms, with some patients noticing improvement within 2 weeks.
• Safety concerns & side Effects: The FDA requires a boxed warning regarding risks of serious infections (including TB), malignancies (including lymphoma), and major adverse cardiovascular events. Common side effects include upper respiratory tract infections, headache, diarrhea, nasal congestion, and hypertension.
• Monitoring: Regular blood tests are needed to monitor for low blood cell counts, high cholesterol, and elevated liver enzymes.

Key Companies between TOFACITINIB and UPADACITINIB:

Efficacy in UC: Upadacitinib is associated with higher steroid-free clinical remission rates at 8–1 4 weeks and 48–60 weeks compared to tofacitinib.

Long Term Outcomes: A 1 2-month study found upadacitinib better at avoiding colectomy than tofacitinib.

Mechanism: Tofacitinib is a pan-JAK inhibitor (inhibits multiple JAK enzymes), while Upadacitinib is a more selective JAK1 inhibitor.

Safety: Both drugs have similar safety profiles in clinical settings. Key warnings for both include venous thromboembolism (blood clots), serious infections, cardiovascular events, and malignancy.

Usage: Both are highly effective in biologic-experienced patients.

1.Literature Review:

1. Srinivasan KK et.al (2007): A Derivative Spectrophotometric procedure has been developed for the simultaneous determination of individual combination of Aceclofenac and UDB with Paracetamol in combined tablet preparation. Tablet extracts of the drugs were prepared in distilled water. The zero crossing point technique and the compensation technique were used to estimate the amount of each drug in the combined formulations, and were compared. The results were found to be accurate and free from interferences. The procedure is rapid, simple, nondestructive, and does not require solutions of equations. Calibration graphs are linear (r2 = 0.9999), with a zero intercept up to 24 mg / ml of each drug in combination with Paracetamol. Detection limits at the p = 0.05 level of significance were calculated to be 0.5 mg / ml of Aceclofenac, UDB and Paracetamol respectively.

2. Ines Toral M et.al(2008): A rapid method for the simultaneous determination of Acetaminophen and UDB by Second Derivative Spectrophotometric has been developed. From a solvent effect study and the spectral behaviours of Acetaminophen and UDB , ethanol was selected as solvent. For a Δλ value of 21 0 nm a smoothing factor of 8,000 and scale factor of 1 ,000,000 were selected, because in these conditions the signal / noise ratio determination of Acetaminophen / UDB in a molar relation of 1 7 / 1 contained in pharmaceutical formulations. At 285.7 nm the Second Derivative value is UDB concentration dependent, corresponding to zero- crossing point of Acetaminophen. On the other hand, UDB does not absorb between 296.0 - 400.0 nm, thus 308.0 nm was selected for Acetaminophen determination by graphic method. The determination ranges for Acetaminophen and UDB were 8.1 x1 0-7 - 5 1 x1 0-5 mol / L and 3.4 x1 0-7 5.0 x1 0-5 mol / L, respectively and can be determined with good precision and accuracy, without previous separation.

3. Manisha Puranik et.al (2006): Two simple, accurate, and precise methods for simultaneous estimation of UDB hydrochloride and Chlorzoxazone in combined dosage form have been described. The first method employs formation and solving of simultaneous equations using 272.20 and 248.30 nm as two analytical wavelengths. The second method is absorption ratio method, which uses 272.20 nm and 257.50 nm as two analytical wavelengths. Both the methods allow the simultaneous.

Determination of UDB hydrochloride and Chlorzoxazone in concentration ranges employed for this purpose with the standard deviation of < 1 .0 % in the assay oftablet.

4. Hisham E et.al (2002): The first method is based upon a kinetic investigation of the oxidation reaction of the drug with alkaline potassium permanganate at room temperature for a fixed time at 20 min. The absorbance of the colored manganate ions was measured at 61 0 nm. The second method is based on the reaction of UDB hydrochloride with 4-chloro- 7- nitrobenzofurazan (NBD–Cl) in presence of 0.1 M sodium bicarbonate. The Spectrophotometric measurements were recorded by measuring the absorbance at 467 nm, at fixed time at 25 min on thermostated water bath at 90 ± 1 °C. All variables affecting the development of the colour have been investigated and the conditions were optimised. The absorbance concentration plots in both methods were rectilinear over the range 5 – 25 and 50 – 250 μg / ml, for the first and second methods, respectively.

5. Aysel Kucuk et al: Two newly developed simple and sensitive methods for determination of UDB hydrochloride in ampoule dosage forms were described and validated. Measurements for Spectrophotometric method were performed using UV- Vis Spectrophotometer in ranges of 200 – 400 nm. The solutions of standard and the samples were prepared in methanol and water media and the UV absorption spectrums of UDB were monitored with maximum absorptions at 275 and 271 nm for both mediums, respectively. The standard calibration curves of UDB were constructed by plotting absorbance vs. concentration in the concentration range with the final dilution of 1 0 – 1 00 μg / ml. Reversed phase chromatography for HPLC method was conducted using a Phenomenex Bondclone C-1 8 column with an isocratic mobile phase consisting of 25 % acetonitrile in 75 % 0.01 M phosphate buffer (pH 3). The effluent was monitored on a DAD detector at 21 8 nm. Linear response (r2 > 0.99) was observed over the range of 0.5 – 40 μg / ml for methanol and water and run on six different occasions.

Aim and Objective

Aim: To Review the Rp-Hplc Method Development and Validation of Upadacitinib (Udb) And Tofacitinib (Tfc) In Bulk and Pharmaceutical Dosage Form.

Objectives:

• To Develop new, simple, sensitive, accurate, and economical analytical methods for the estimation of UDB and TFC.
• To Validate the proposed methods in accordance with USP and ICH guidelines for the intended analytical application, i.e., to apply the proposed methods for analysis of these drugs in their dosage forms.
• To Review the literature to identify gaps and develop new sensitive RP-HPLC and Spectrophotometric methods for the estimation of UDB and TFC in bulk and pharmaceutical formulations.

Plan of Work

• Collection of related articles of the drug.
• The extensive survey of literature for Upadacitinib (UDB) and Tofacitinib (TFC) regarding their characteristic andanalytical methods. This forms the basis for development of methods.
• Study of UV and HPLC methods.
• Study of drug profile.
• To undertake solubility studies for analyte Upadacitinib.
• Selection of suitable solvent for quantitative extraction of analyte present in theformulations.
• Selection of suitable stationary phase and mobile phase.
• Selection of detection of wavelength.
• Develop initial conditions for HPLC and UV methods.
• Optimisation of HPLC and UV method.
• Analytical methods and validation of developed HPLC and UV methods as per ICHguidelines.
• Validation of developed methods for the following parameters.

5. Accuracy
5. Precision,
5. Specificity
5. Limit of detection
5. Linearity
5. Robustness

Materials & Methods

UDB is a fluoroquinolone antibiotic indicated for bacterial infections. having themolecular structure[1 9] as shown in Fig: 1 .8.

Fig. 1.8. Structure of UDB

Fig. 1.9. Structure of TCF

REFERENCES

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