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Related Concept Videos

Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

Blood Studies for Cardiovascular System I: Cardiac Biomarkers

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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
Troponins
Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
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Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers01:19

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Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
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Related Experiment Video

Updated: Jan 7, 2026

Dried Blood Spot Collection of Health Biomarkers to Maximize Participation in Population Studies
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Biomarkers.

Akihito Korenaga1, Rie Yamamoto2, Mayu Yoneyama1

  • 1Shimadzu Corporation, Kyoto, Japan.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 24, 2025
PubMed
Summary

This study validates a new plasma assay for Alzheimer's disease biomarkers using immunoprecipitation-mass spectrometry. The improved method offers reliable and reproducible measurement of amyloid-beta peptides for large-scale screening.

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Analytical Chemistry

Background:

  • Plasma biomarkers offer a non-invasive approach for Alzheimer's disease (AD) screening.
  • Previous research demonstrated a correlation between plasma amyloid-beta (Aβ) peptides (Aβ1-40, Aβ1-42, APP669-711) and brain amyloid accumulation.
  • This study focuses on the analytical validation of an improved plasma Aβ assay.

Purpose of the Study:

  • To analytically validate a plasma amyloid-beta assay using immunoprecipitation-matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (IP-MALDI-MS).
  • To assess the performance of a benchtop MALDI-TOF mass spectrometer for measuring plasma Aβ peptides.
  • To evaluate the assay's reproducibility, trueness, dynamic range, spike recovery, and dilution linearity.

Main Methods:

  • Immunoprecipitation using anti-amyloid beta antibody-coated magnetic beads.
  • Measurement of immunoprecipitated samples using a benchtop MALDI-TOF mass spectrometer.
  • Normalization of peptide intensities using stable isotope-labeled Aβ1-38 as internal standards.
  • Evaluation of biomarker ratios (Aβ1-40/Aβ1-42 and APP669-711/Aβ1-42) for reproducibility and accuracy.

Main Results:

  • High intra-assay and inter-assay reproducibility with coefficients of variation (CV) < 5%.
  • Accurate trueness (100±20%) across specified concentration ranges for Aβ1-40, Aβ1-42, and APP669-711.
  • Excellent spike recovery (87-113%) and dilution linearity (88-111%).

Conclusions:

  • The IP-MALDI-MS system with a benchtop instrument demonstrates sufficient stability and reliability for plasma Aβ peptide measurement.
  • The validated assay shows improved reproducibility and trueness compared to previous methods.
  • This assay is suitable for large-scale Alzheimer's disease screening using plasma biomarkers.