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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
    11. Optical evaluation of internal damage to human hair based on second near‐infrared window polarization microscopy International Journal of Cosmetic Science · 2024
    12. Structured Oral Examinations in Internal Medicine - Case H MedEdPORTAL · 2009
    13. Study of<i>Demodex</i>mites: Challenges and Solutions Journal of the European Academy of Dermatology and Venereology · 2015 · 41 citations
    14. Exploring the association between alcohol consumption and androgenic alopecia: a systematic review and meta-analysis Alcohol and Alcoholism · 2024
    15. Matrix effects and application of matrix effect factor Bioanalysis · 2017 · 323 citations
    16. High-performance liquid chromatographic determination of α-tocopheryl nicotinate in cosmetic preparations 1992 · 5 citations
    17. A Method to Monitor Dutasteride in Rat Plasma Using Liquid-Liquid Extraction and Multiple Reaction Monitoring: Comparisons and Validation Mass spectrometry letters · 2014 · 7 citations
    18. Platelet-rich plasma therapy: key infection prevention practices and strategies for safety risk reduction Infection Control and Hospital Epidemiology · 2025
    19. Concept Paper on Health and Safety Issues in Day Care. Final Manuscript. 1977
    20. Non‐invasive evaluation of hair interior morphology by X‐ray microscope Journal of dermatology · 2006 · 3 citations
    21. Scalp Microinfusion: A Novel Drug Delivery Technique for Hair Loss Treatment Skin appendage disorders · 2023
    22. Hair vibrancy: A quantitative multi‐modal approach bridging consumer perception, expert and instrumental evaluation International Journal of Cosmetic Science · 2026
    23. Rapid and Sensitive LC–MS–MS Method for the Simultaneous Estimation of Alfuzosin and Dutasteride in Human Plasma Chromatographia · 2008 · 25 citations
    24. Alopecia Areata–Specific Patient-Reported Outcome Measures JAMA Dermatology · 2025 · 2 citations
    25. High-performance liquid chromatographic determination of finasteride in human plasma using direct injection with column switching Journal of Chromatography B: Biomedical Sciences and Applications · 1996 · 29 citations
    26. A liquid chromatography/tandem mass spectrometry method for determination of aristolochic acid‐I in rat plasma Biomedical Chromatography · 2009 · 15 citations
    27. Determination of finasteride in human serum by LC-MS/MS 분석과학 · 2011 · 2 citations
    28. Cyproterone Acetate Quantification in Human Plasma by High-performance Liquid Chromatography Coupled to Atmospheric Pressure Photoionization Tandem Mass Spectrometry Arzneimittelforschung · 2011 · 1 citations
    29. BIO-ANALYTICAL METHOD DEVELOPMENT AND VALIDATION OF FINASTERIDE, TADALAFIL, AND ITS APPLICATION TO PHARMACOKINETIC STUDIES IN RAT PLASMA BY USING LC-MS/MS International Journal of Applied Pharmaceutics · 2024
    30. Study on pharmacokinetics and determination of perospirone in human plasma by HPLC-MS/MS Chinese Journal of Hospital Pharmacy · 2013