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    Glossary Internal Standard

    substance added to samples to ensure accurate measurements

    An Internal Standard (IS) is a substance added in a constant amount to samples, calibrators, and quality controls in an analytical experiment. It is used to correct for variations in sample preparation and instrument response, ensuring more accurate and consistent results. This technique is particularly useful in fields like biochemistry and pharmacology, where precise quantification of compounds is critical.

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    1. Quantitative analysis of finasteride tablets dissolution content with non-isotopically labeled internal standard by paper spray ionization mass spectrometry Journal of Separation Science · 2018 · 2 citations
    2. The Platelet Rich Plasma (PRP) Preparation and Standardization of time interval for scalp hair loss Journal of Pakistan Association of Dermatologists · 2022
    3. Targeted Determination of Residual Sex Hormones in Cosmetics Using Magnetic Solid-Phase Extraction with Isotope-Labeled Internal Standards by UHPLC-MS/MS Molecules · 2025
    4. Simultaneous determination of multi-class active pharmaceutical ingredients by UHPLC-HRMS Journal of pharmaceutical and biomedical analysis · 2021 · 2 citations
    5. Matrix matching in quantitative bioanalysis by LC–MS/MS a dream or a reality? Bioanalysis · 2019 · 2 citations
    6. Ultra-Performance Liquid Chromatography with Electrospray Ionization Tandem Mass Spectrometry for the Determination of Ketoconazole in Anti-Dandruff Shampoo Analytical Letters · 2014 · 1 citations
    7. Analysis of Gene Expression in Isolated Single Hair Follicles: An Approach Using Semiquantitative Reverse-Transcriptase—Polymerase Chain Reaction Journal of Investigative Dermatology · 1995
    8. Synthesis of 5,6,6-[2H3]finasteride and quantitative determination of finasteride in human plasma at picogram level by an isotope-dilution mass spectrometric method Journal of Chromatography B: Biomedical Sciences and Applications · 1995 · 20 citations
    9. Effect of Exercise Interventions on Metabolic, Reproductive and Mental Health in Overweight Women with Polycystic Ovary Syndrome Victoria University Research Repository (Victoria University) · 2021
    10. Metal doped keratin film standard for LA-ICP-MS determination of lead in hair samples Journal of analytical atomic spectrometry · 2010 · 18 citations
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