MCQs Quiz

Nepheloturbidometry combines nephelometry and turbidimetry to quantify suspended particles by measuring light scattering and loss of transmitted light. The principle relies on light scattering phenomena (Rayleigh and Mie regimes) where particle size, concentration, refractive index, wavelength and measurement angle influence signal. Instrumentation includes a stable light source, sample cell, optics, angle-specific detectors (often 90° for … Read more

Atomic absorption spectroscopy (AAS) is a sensitive analytical technique widely used in pharmaceutical analysis for trace metal determination. This introduction covers the AAS principle — generation of free ground‑state atoms and element‑specific light absorption — and key instrumentation: hollow cathode lamps, nebulizers, burners, graphite furnaces, monochromators, and photomultiplier detectors. It explains common interferences (spectral overlap, … Read more

Flame photometry is a vital, simple analytical technique used in pharmaceutical analysis for the quantitative determination of alkali and alkaline earth metals. B. Pharm students should understand the core principle—excited atoms emit characteristic radiation in a flame—and common instrumentation components such as the burner, nebulizer, monochromator/filters and photodetector. Important practical topics include interferences (spectral, chemical, … Read more

Introduction: Infrared (IR) spectroscopy is a core analytical technique in pharmaceutical analysis, essential for B.Pharm students studying drug identification, structural elucidation and quality control. IR (including FTIR and ATR) detects molecular vibrational modes and characteristic functional group absorptions—such as carbonyl (~1700 cm−1), O–H, N–H and C≡N—allowing fingerprint matching, polymorph differentiation, impurity profiling and salt form … Read more

Introduction: Infrared (IR) detectors convert infrared radiation into measurable electrical signals and are essential in pharmaceutical analysis, instrumental spectroscopy, and quality control. This overview compares main thermal and pyroelectric detector types — Golay cell, bolometer, thermocouple, thermistor and pyroelectric detector — describing principles, materials, sensitivity, response time, noise-equivalent power (NEP) and spectral range. B. Pharm … Read more

Introduction Instrumentation of IR spectroscopy covers the essential components that determine spectral quality: IR sources, monochromators and detectors. B. Pharm students must understand common IR sources (Globar, Nernst glower, lasers), types of monochromators (dispersive prisms/gratings and the Michelson interferometer used in FT‑IR), beam splitters, and detector classes (thermal detectors like bolometers and pyroelectric, and photon … Read more

Introduction: Vibrational frequency and absorption are central concepts in infrared (IR) spectroscopy, crucial for B.Pharm students analyzing drug molecules and functional groups. Key factors affecting vibrational frequency include bond strength, reduced mass, bond order, hybridization (sp, sp2, sp3), and electronegativity. Spectral shifts arise from conjugation, hydrogen bonding, solvent effects, isotopic substitution, anharmonicity, and vibrational coupling, … Read more

Sample handling techniques for IR spectroscopy are essential for accurate spectral interpretation in pharmaceutical analysis. This introduction reviews practical methods such as KBr pellet preparation, Nujol mulls, attenuated total reflectance (ATR), thin films, liquid cells, and diffuse reflectance, emphasizing steps to avoid contaminants, moisture, and scattering artifacts. Key considerations include choice of window materials (NaCl, … Read more

Infrared (IR) spectroscopy is a fundamental analytical technique for B.Pharm students that probes molecular vibrations to identify functional groups and confirm drug structures. Based on absorption of IR radiation at characteristic wavenumbers (cm−1), IR reveals stretching and bending vibrational modes, fingerprint regions, and effects of conjugation, hydrogen bonding, and isotopic substitution. Key concepts include selection … Read more

Introduction: Fluorimetry, or fluorescence spectroscopy, is a powerful analytical technique widely used in pharmaceutical analysis for sensitive and selective detection of drugs, impurities, and biomolecules. Understanding instrumentation — light sources, excitation-emission optics, monochromators, filters, detectors (PMT, CCD), and software — is essential for accurate assays. Key concepts include quantum yield, fluorescence lifetime, inner-filter effects, quenching … Read more