Tackling the Orexin Conundrum: An Optimized LC–MS/MS Method Demonstrates Accurate CSF Quantification and Absence in Peripheral Blood

Yan Cao; Y M Zhang; J Y Han; Zhengwen Xu; Huimin Zhang; Y L Yang; Dong Wang; Yanhong Zhai; Shuqin Zhan; Hui Li; Zhu Cao

doi:10.1021/acs.analchem.6c00454

May 12, 2026Analytical Chemistry

Tackling the Orexin Conundrum: An Optimized LC–MS/MS Method Demonstrates Accurate CSF Quantification and Absence in Peripheral Blood

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Key Points

This research aims to develop a high-specificity method for quantifying orexin in cerebrospinal fluid (CSF) and to assess its reliability in sleep disorder diagnostics.
Developed an optimized LC–MS/MS method for orexin quantification in CSF and peripheral blood.
Analyzed the presence of orexin-A in CSF and its absence in peripheral blood samples.
Established reference standards for clinical biomarker analysis.
CSF orexin-A showed a significantly higher concentration compared to peripheral blood, confirming its exclusive presence in CSF.
The optimized method demonstrated high specificity and accuracy, making it a reliable reference for sleep disorder diagnostics.
Orexin-A in CSF was established as the most reliable clinical biomarker for sleep disorders.

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Implication

Establishes CSF orexin-A as a reliable biomarker for sleep disorders, indicating its potential in diagnostics.

Abstract

= 0.297). This study establishes a high-specificity analytical framework as a practical reference standard for refined sleep disorder diagnostics and confirms that CSF orexin-A remains the currently the most reliable clinical biomarker.

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Cite This Study

Cao et al. (2026) studied this question.

synapsesocial.com/papers/6a056668a550a87e60a1e761 https://doi.org/10.1021/acs.analchem.6c00454

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Tackling the Orexin Conundrum: An Optimized LC–MS/MS Method Demonstrates Accurate CSF Quantification and Absence in Peripheral Blood

Key Points

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Implication

Abstract

Discussion

Cite This Study

Tackling the Orexin Conundrum: An Optimized LC–MS/MS Method Demonstrates Accurate CSF Quantification and Absence in Peripheral Blood

Key Points

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

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