Background: Acetyl octapeptide-3 (SNAP-8) is an antiaging peptide that is more effective than acetyl hexapeptide-3, which is more stable than botulinum toxin and effectively relieves facial wrinkles. Products containing SNAP-8 such as patch are producing, but analytical method has not been reported to determination of SNAP-8. Method: Mobile phase, collision energy, and desolvation line temperature were optimized, and mass spectral data set for SNAP-8 was newly constructed by liquid chromatography-triple quadrupole mass spectrometer in multiple reaction monitoring mode. Results: The developed method showed good linearity (r ≥ 0.9971) with limit of quantification of 0.0125 ng/mL, repeatability (% relative standard deviation = 0.02 to 0.12) and accuracy (% relative error = − 1.68 to 1.44) under optimal conditions. This method was successfully applied to a biodegradable microneedle patch loaded with SNAP-8. Conclusion: The present method for the quantification of SNAP-8 may be useful for quality control in the cosmetic fields.

Endogenous normal and modified nucleosides have been studied as potential biomarkers of various inflammatory diseases including sepsis. However, no systematic nucleoside profiling and pattern analysis study has been performed in sepsis. In this study, simultaneous liquid chromatography–mass spectrometry profiling of normal and modified nucleosides was performed to characterize altered nucleoside metabolism in sepsis mice.

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Background; The primo vascular system (PVS) is new circulatory system. However, the primo vascular system doesn’t achieve now on the valuation criteria on the substance of meridians, so that anyone can't prove that the primo vascular system is the substance of meridians. Objectives: The purpose of this study is to prove clinical-physiologically that the primo vascular system is the substance of acupuncture meridian.Methods: Meridian-like high thermal line (MLHTL) induced by the mineral pulse light stimulus on acupoints, and nephrotic syndrome treated simultaneously without any drug use, were researched and analyzed. Next, the inducing characteristic of meridian-like high thermal lines and, anatomic and electro-physiologic characteristic of PVS were researched and analyzed. Results: The KI, SP meridian-like high thermal line coinciding completely along the classic KI, SP meridian course, were induced by the mineral pulse light stimulus on SP6 acupoints, and simultaneously nephrotic syndrome in kidney, the internal target organ connected along KI meridian from the KI3, SP6 acupoints, was treated without any drug use. And the primo vascular system was basis tissue of MLHTL inducing. Conclusions: The primo vascular system was achieved completely to the valuation criteria on the substance of meridians. Thus, the primo vascular system is the substance of meridians.