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Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

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In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
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Estimating the Yield of Compounds on the TLC Plate via the Blue-LED Illumination Technique
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Stability-indicating spectrophotometric manipulations for the determination of Letrozole in the presence of its

Nourhan A Abd El-Fatah1, Manal Mohammed Fouad2,3, Maha A Hegazy4

  • 1Analytical Chemistry Department, Faculty of Pharmacy, October University for Modern Sciences and Arts (MSA), 6th October City, Giza, 11787, Egypt. naeldin@msa.edu.eg.

BMC Chemistry
|March 8, 2025
PubMed
Summary
This summary is machine-generated.

New spectrophotometric methods accurately quantify letrozole (LTZ), a breast cancer drug, even after alkaline degradation. These validated techniques ensure reliable analysis of LTZ in various forms.

Keywords:
Alkali-induced degradation productsClorTox assessmentLetrozoleSpectrophotometryWhiteness evaluation

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Area of Science:

  • Analytical Chemistry
  • Pharmaceutical Analysis

Background:

  • Letrozole (LTZ) is a crucial hormonal therapy for breast cancer.
  • LTZ is prone to degradation in alkaline environments due to its cyano phenyl group.

Purpose of the Study:

  • To develop and validate novel stability-indicating spectrophotometric methods for accurate LTZ quantification.
  • To address the challenge of LTZ degradation products in analytical measurements.

Main Methods:

  • Development of three distinct spectrophotometric methods: Second derivative (D2), Ratio Difference (RD), and First derivative of ratio spectra (DD1).
  • Validation of methods according to International Council for Harmonisation (ICH) guidelines.
  • Application of Whiteness tool (RBG12 algorithm) and ChlorTox scale for environmental and hazard assessment.

Main Results:

  • The developed methods demonstrated linearity within specified ranges (1.00–16.00 µg/mL for D2, 3.00–16.00 µg/mL for RD and DD1).
  • High recovery rates (100.02% ± 1.371 for D2, 100.05% ± 1.972 for RD, 100.40% ± 1.223 for DD1) indicate method accuracy.
  • Successful application of the methods for LTZ determination in bulk powder, mixtures, and pharmaceutical formulations.

Conclusions:

  • The proposed spectrophotometric methods are simple, sensitive, and accurate for quantifying letrozole in the presence of its degradation products.
  • These validated methods provide reliable analytical tools for pharmaceutical quality control and research involving letrozole.