An Improved and Validated HPLC Method for the Determination of Methylprednisolone Sodium Succinate and its Degradation Products in Nanoparticles

A new validated facile HPLC analysis method to determine methylprednisolone including its derivatives and practical application

Methylprednisolone sodium succinate (MPSS) is a parenteral water-soluble corticosteroid ester. It gives three peaks methylprednisolone (MP), 17-methylprednisolone hemisuccinate (17-MPHS), and methylprednisolone hemisuccinate (MPHS) that share in the assay determination as total MP. It is used on a wide scale in prescribed anti-inflammatory drugs as a common use. The current study aimed to find a rapid RP-HPLC method of MP and its derivatives analysis with high linearity, repeatability, sensitivity, selectivity, and inexpensive to use without the need for any special chemical reagents. The use of the current method achieved a satisfactory result to detect, determine and separate the MP, 17-MPHS, and MPHS in a short time. The chromatographic system consists of RP-HPLC using the BDS column (250 mm × 4.6 mm × 5 μm). The mobile phase was prepared by mixing the WFI: glacial acetic acid: acetonitrile in a volume ratio (63:2:35) at a flow rate of 2.0 mL/min with detection wavelength at 254 nm at room temperature and injection volume 20 μL. The method manifested a satisfied linearity regression R² (0.9998-0.99999) with LOD 143.97 ng/mL and 4.49 µg/mL; and LOQ 436.27 ng/mL and 13.61 µg/mL for MP and MPHS respectively. The method proved its efficiency via system suitability achievement in the robustness and ruggedness conduction according to the validation guidelines. High sensitivity according to its LOD and LOQ. So, the current method could be considered in the pharmaceutical industry. The suggested method has been successfully implemented in the Egyptian local market for the quantitative assessment of the assay of the finished product.

In Vitro Release Test of Nano-drug Delivery Systems Based on Analytical and Technological Perspectives

Background:

Nanotech products are gaining more attention depending on their advantages for improving drug solubility, maintenance of drug targeting, and attenuation of drug toxicity. In vitro release test is the critical physical parameter to determine the pharmaceutical quality of the product, to monitor formulation design and batch-to-batch variation.

Methods:

Spectrophotometric and chromatographic methods are mostly used in quantification studies from in vitro release test of nano-drug delivery systems. These techniques have advantages and disadvantages with respect to each other considering dynamic range, selectivity, automation, compatibility with in vitro release media and cost per sample.

Results:

It is very important to determine the correct kinetic profile of active pharmaceutical substances. At this point, the analytical method used for in vitro release tests has become a very critical parameter to correctly assess the profiles. In this review, we provided an overview of analytical methods applied to the in vitro release assay of various nanopharmaceuticals.

Conclusion:

This review presents practical direction on analytical method selection for in vitro release test on nanopharmaceuticals. Moreover, precautions on analytical method selection, optimization and validation were discussed.