Cyclic 3',5'-adenosine monophosphate (cAMP) and cyclic 3',5'-guanosine monophosphate (cGMP) are considered as potential biomarkers for Yin-Yang disharmony in traditional Chinese medicine.However,phosphodiesterase-mediated ex vivo degradation of these molecules in biological samples may result in their underestimation.In the present study,a ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) method was developed for determination of cAMP and cGMP in rat plasma,with special consideration of their stability ex vivo.Following precipitation of proteins from plasma samples with 0.4 M perchloric acid,the analytes were chromatographed on a Shimadzu Shim-pack-XR-ODS Ⅱ column with 2.5 mM ammonium acetate and methanol in gradient mode.The MS/MS detection was performed using multiple reaction monitoring in the positive electrospray ionization mode.The lower limit of quantification was 0.27 ng/mL for cAMP and 0.37 ng/mL for cGMP.The method was used to determine the plasma cAMP and cGMP levels in normal and Yin deficiency diabetic rats treated with or without Rehmannia glutinosa.The developed method may be useful for evaluating the regulatory effects of Chinese herbal medicine on the levels of cAMP and cGMP in the body.

Objective:To systematically review the qualitative research on the care experience of caregivers of palliative care for minors, in order to provide a reference for formulating a care plan that is more in line with the needs of palliative care for minors and their families.Methods:The Cochrane Library, Australia Joanna Briggs Institute Evidence-based Health Care Center Library, Embase, PubMed and Web of Science, CINAHL, China National Knowledge Infrastructure, Wanfang Database, VIP Database and China Biology Medicine Disc were searched by computer for literature on qualitative research on care experience of underage hospice care caregivers from the establishment of the database to December 30, 2023.Results:A total of 11 articles were included and 70 research results were extracted, which were summarized into 7 new categories and formed 2 integrated results: professional caregivers and relative caregivers had multiple care burden, and need multiple care support; professional caregivers and relative caregivers can shoulder the care responsibility of children together, actively respond to the difficulties in care, gain personal care experience and growth.Conclusions:Hospice care for minors has its own characteristics, and caregivers have various care burdens and needs. Special attention should be paid to the emotional experience and care demands of caregivers, and targeted support and protection should be provided to promote the construction of hospice care team for minors in China and improve the level of hospice care for minors in China.

Genome-scale metabolomics analysis is increasingly used for pathway and function dis-covery in the post-genomics era.The great potential offered by developed mass spectrometry(MS)-based technologies has been hindered,since only a small portion of detected metabolites were iden-tifiable so far.To address the critical issue of low identification coverage in metabolomics,we adopted a deep metabolomics analysis strategy by integrating advanced algorithms and expanded reference databases.The experimental reference spectra and in silico reference spectra were adopted to facilitate the structural annotation.To further characterize the structure of metabolites,two approaches were incorporated into our strategy,i.e.,structural motif search combined with neutral loss scanning and metabolite association network.Untargeted metabolomics analysis was performed on 150 rice cultivars using ultra-performance liquid chromatography coupled with quadrupole-Orbitrap MS.Consequently,a total of 1939 out of 4491 metabolite features in the MS/MS spectral tag(MS2T)library were annotated,representing an extension of annotation coverage by an order of magnitude in rice.The differential accumulation patterns of flavonoids between indica and japon-ica cultivars were revealed,especially O-sulfated flavonoids.A series of closely-related flavonolignans were characterized,adding further evidence for the crucial role of tricin-oligolignols in lignification.Our study provides an important protocol for exploring phytochemical diversity in other plant species.