A method for determining volatile organic compounds (VOCs) emitted from medical molecular sieve oxygen concentrators was developed using thermal desorption-gas chromatography-mass spectrometry (TD-GC-MS). The oxygen concentrator gas was sampled at a flow rate of 0.5 L/min through a branched sampling system onto Tenax GR/carbopack B adsorption tubes. The adsorbed compounds were desorbed and introduced using a programmed temperature vaporization inlet system, followed by chromatographic separation on an SH-I-624Sil MS column. Four VOCs (BHT-Q, PTBP, BHT-quinol, and EHB) were detected in the medical oxygen concentrator using this method. Calibration curves for these compounds exhibited excellent linearity ( R ²>0.99) within the range of 3~100 ng. With a sampling volume of 20 L, the detection limit of the four VOCs ranged from 0.003 9 to 0.022 2 μg/m ³. Spike recovery rates for the four VOCs were between 95% and 115%, with relative standard deviations (RSDs) below 5% ( n=6). The method is simple, rapid, highly sensitive, and accurate, making it suitable for VOCs detection in medical molecular sieve oxygen concentrators.
Volatile Organic Compounds/analysis* ; Gas Chromatography-Mass Spectrometry/methods* ; Oxygen

Ophthalmic drug-device combination products are a new method of ophthalmic disease treatment,which is characterized by high bioavailability,strong targeting and good compliance.However,it is difficult for products to be developed and regulated due to the complexity of the human eye structure,drug-device interactions,and other factors.To provide a basis for guaranteeing the safety and efficacy of products development and management,the related regulations,current research,and evaluation of the quality of products are summarized in this paper.

With the development of the economy and technological progress,more and more animal-derived mesh products are being utilized in the medical field for tissue and organ repair and replacement.Owing to the complexity of their structure and production process,these animal-derived meshes still face several challenges in practical applications,such as insufficient mechanical strength,rapid degradation rates,and the detection of harmful leachable substances.Among these challenges,the production process is a key factor affecting product quality.This paper reviews the key aspects of the production process and quality control for animal-derived meshes in China,offering new insights for the quality control and regulatory oversight of such products.

Objective To explore the activation of tumor necrosis factor-α(TNF-α)signaling pathway and the expressions of the associated inflammatory factors in NPHP1-defective renal tubular epithelial cells.Methods A human proximal renal tubular cell(HK2)model of lentivirus-mediated NPHP1 knockdown(NPHP1KD)was constructed,and the expressions of TNF-α,p38,and C/EBPβ and the inflammatory factors CXCL5,CCL20,IL-1β,IL-6 and MCP-1 were detected using RT-qPCR,Western blotting or enzyme-linked immunosorbent assay.A small interfering RNA(siRNA)was transfected in wild-type and NPHP1KDHK2 cells,and the changes in the expressions of TNF-α,p38,and C/EBPβ and the inflammatory factors were examined.Results NPHP1KDHK2 cells showed significantly increased mRNA expressions of TNF-α,C/EBPβ,CXCL5,IL-1β,and IL-6(P<0.05),protein expressions of phospho-p38 and C/EBPβ(P<0.05),and IL-6 level in the culture supernatant(P<0.05),and these changes were significantly blocked by transfection of cells with siRNA-C/EBPβ(P<0.05).Conclusion TNF-α signaling pathway is activated and its associated inflammatory factors are upregulated in NPHP1KDHK2 cells,and C/EBPβ may serve as a key transcription factor to mediate these changes.

AIM:To explore the effect of polyphenolic compound 3,5-dihydroxy-4-methoxybenzyl alcohol(DHMBA)on hypoxia/reoxygenation(H/R)injury of human umbilical vein endothelial cells(EA.hy926 cells)and its po-tential mechanisms.METHODS:To construct an H/R model,the EA.hy926 cells were cultured in an acidic hypoxia buffer while in an anaerobic workstation.The cells were divided into control,H/R,H/R+different doses of DHMBA,H/R+edaravone(antioxidant)and H/R+reactive oxygen species(ROS)inducer oligomycin A+DHMBA groups.Cell viability was measured by CCK-8 assay,and tumor necrosis factor-α(TNF-α)and interleukin-6(IL-6)levels in cells were mea-sured by ELISA.Phosphorylation of endothelial nitric oxide synthase(eNOS)and nuclear factor-κB(NF-κB)p65 were measured by Western blot.Intracellular NO levels were determined by laser confocal microscopy.Glutathione(GSH)/glu-tathione disulfide(GSSG)oxidation balance was determined by the dinitrobenzoic acid chromogenic method.Intracellular ROS levels were measured by flow cytometry.Lactate dehydrogenase(LDH)leakage was determined using nitro blue tet-razolium staining.Scratch assays were performed to assess cell migration.RESULTS:DHMBA exhibited no significant cytotoxicity between 125 and 1 000 μmol/L.In H/R-injured human umbilical vein endothelial cells,DHMBA improved cell survival,inhibited phosphorylation of NF-κB p65,reduced the content of TNF-α and IL-6,and increased phosphory-lation of eNOS and NO levels.DHMBA also suppressed ROS overload and restored the ratio between GSH and oxidized GSH,decreased in LDH leakage and increased cell migration in H/R-injured human umbilical vein endothelial cells.CONCLUSION:DHMBA can alleviate H/R-induced oxidative stress,inflammation,cellular damage,and dysfunction,which are associated with the ability of DHMBA to inhibit ROS production in human umbilical vein endothelial cells.

Objective To explore the activation of tumor necrosis factor-α(TNF-α)signaling pathway and the expressions of the associated inflammatory factors in NPHP1-defective renal tubular epithelial cells.Methods A human proximal renal tubular cell(HK2)model of lentivirus-mediated NPHP1 knockdown(NPHP1KD)was constructed,and the expressions of TNF-α,p38,and C/EBPβ and the inflammatory factors CXCL5,CCL20,IL-1β,IL-6 and MCP-1 were detected using RT-qPCR,Western blotting or enzyme-linked immunosorbent assay.A small interfering RNA(siRNA)was transfected in wild-type and NPHP1KDHK2 cells,and the changes in the expressions of TNF-α,p38,and C/EBPβ and the inflammatory factors were examined.Results NPHP1KDHK2 cells showed significantly increased mRNA expressions of TNF-α,C/EBPβ,CXCL5,IL-1β,and IL-6(P<0.05),protein expressions of phospho-p38 and C/EBPβ(P<0.05),and IL-6 level in the culture supernatant(P<0.05),and these changes were significantly blocked by transfection of cells with siRNA-C/EBPβ(P<0.05).Conclusion TNF-α signaling pathway is activated and its associated inflammatory factors are upregulated in NPHP1KDHK2 cells,and C/EBPβ may serve as a key transcription factor to mediate these changes.

Objective:To investigate the correlation of peripheral blood relative mitochondrial DNA copy number(mtDNAcn)with intrinsic capacity and body composition, and to identify potential biomarkers for healthy aging.Methods:Clinical data of 416 patients admitted to our hospital from September 2019 to June 2021 were consecutively collected.MtDNA was extracted from peripheral blood of these subjects, and mtDNAcn was determined by a real-time fluoresence quantitative reverse transcription-polymerase chain reaction(qRT-PCR). Intrinsic capacity assessment included 5 aspects that were exercise[Morse Fall Scale(MFS), Physiological Frailty Phenotype(PFP), Sarcopenia Questionnaire(SARC-CALF), Short Physical Performance Battery(SPPB), Time Up and Go Test(TUG)]; vitality[Mini Nutritional Assessment(MNA), Multidimensional Prognostic Index(MPI)]; cognition[Mini-Mental State Examination(MMSE)scale]; psychology[Geriatric Depression Scale(GDS), Self-rating Anxiety Scale(SAS)]; sensory capacities[Cumulative Illness Rating Scale-the Comorbidity Index(CIRS-CI)]. To assess body composition, dual-energy X-ray absorptiometry was used to measure body fat, including trunk fat, total body fat, fat in the abdominal region, fat in the buttock region, and then to calculate fat index(FMI)and limb skeletal muscle mass index(ASMI).Results:Spearman correlation analysis showed that mtDNAcn had a negatively correlation with age( r=-0.176, P<0.05). After adjustment for gender and body mass index, partial correlation analysis showed mtDNAcn were still negatively correlated with age( r=-0.144, P<0.05). Furthermore, mtDNAcn was significantly correlated with 4 m gait speed, the scores of SARC-CalF, MFS, MNA, MMSE, MPI and its sub-scale's Activities of Daily Living(ADL)and Short Portable Mental Status Questionnaire(SPMSQ)( r=0.171, -0.207, -0.163, 0.221, 0.184, -0.210, 0.241, -0.269, all P<0.05). After adjustment for age, gender and body mass index, partial correlation analysis showed mtDNAcn still had a significant correlation with gait speed, the scores of MFS, MNA, MPI and SPMSQ( r=0.170, -0.170, 0.148, -0.242, -0.188, all P<0.05). In addition, the Spearman correlation analysis showed that mtDNAcn was positively correlated with FMI, trunk fat, total body fat, abdominal fat and fat in the buttock region( r=0.168, 0.143, 0.175, 0.116, 0.199, all P<0.05). However, after adjustment for age and gender, mtDNAcn was only correlated with FMI, total body fat, fat in the buttock region( r=0.126, 0.131, 0.127, all P<0.05). On the other hand, multiple linear regression analysis showed that mtDNAcn was significantly correlated with age, gait speed, FMI, total body fat, fat in the buttock region, the scores of MFS, PFP, MNA and MPI( β=-0.191, 0.156, 0.126, 0.131, 0.125, -0.119, -0.145, 0.151, -0.171, all P<0.05). Conclusions:MtDNAcn is correlated with physical function, frailty, nutrition, falling, cognition and body composition, and may be considered as a biomarker for the evaluation of the locomotion and vitality of human intrinsic capacity.

Mitochondrial dynamics regulates mitochondrial morphology and functions.Imbalance in mitochondrial dynamics with aging leads to mitochondrial dysfunction, accelerates the aging process and is closely related to the occurrence and progression of age-related diseases.However, the specifics of the relationship between aging and altered mitochondrial dynamics are still not fully understood.Here, we review the link between mitochondrial dynamics and aging, and discuss mechanisms underlying age-related diseases associated with altered mitochondrial dynamics, aiming to identify novel therapeutic targets and strategies for the management of age-related diseases.

Objective:To investigate the correlation of mitochondrial respiration function and oxidative phosphorylation of peripheral blood mononuclear cells(PBMCs)with grip strength and muscle mass in the elderly, and to identify potential biomarkers for the diagnosis of sarcopenia.Methods:A total of 65 patients admitted to our hospital from June 2019 to August 2020 were enrolled in this study.PBMCs were extracted from subjects.Mitochondrial oxidative respiration function was assessed via the Seahorse XF24 analyzer.Grip strength was measured using a hydraulic dynamometer, and appendicular skeletal muscle mass(ASM)was estimated by dual-energy X-ray absorptiometry(DXA). Multivariate analysis was conducted by using partial correlation analysis and multiple linear regression, in order to evaluate the correlation of mitochondrial oxidative respiration function with grip strength and ASM.Results:After adjustment for gender and body mass index(BMI), partial correlation analysis showed that grip strength and ASM had a negative correlation with age( r=-0.537 and -0.390, both P<0.001); and basal respiration, maximal respiration, ATP production and spare respiratory capacity of mitochondria in PBMCs were negatively correlated with age( r=-0.558, -0.614, -0.526 and -0.582, all P<0.001), whereas grip strength and ASM were positively correlated with basal respiration, maximal respiration, ATP production, spare respiratory capacity and proton leak of mitochondria in PBMCs(grip strength: r=0.414, 0.451, 0.362, 0.420 and 0.425, P=0.002, 0.001, 0.008, 0.002 and 0.002; ASM: r=0.319, 0.368, 0.299, 0.352 and 0.279, P=0.019, 0.006, 0.028, 0.009 and 0.041). Multiple linear regression analysis showed that grip strength and ASM were positively correlated with basal respiration, maximal respiration, ATP production, spare respiratory capacity and proton leak of mitochondria in PBMCs(grip: β=0.503, 0.548, 0.452, 0.519 and 0.532, t=3.248, 3.604, 2.774, 3.301 and 3.350, P=0.002, 0.001, 0.008, 0.002 and 0.002; ASM: β=0.302, 0.355, 0.289, 0.346 and 0.271, t=2.427, 2.856, 2.263, 2.716 and 2.091, P=0.019, 0.006, 0.028, 0.009 and 0.041). Age was negatively correlated with basal respiration, maximal respiration, ATP production and spare respiratory capacity of mitochondria in PBMCs( β=-0.581, -0.654, -0.558 and -0.640, t=-4.285, -5.157, -3.938 and -4.863, all P<0.001). Multiple linear regression analysis showed that ASM and grip strength had no significant correlation with basal respiration, maximal respiration, ATP production, spare respiratory capacity or proton leak of mitochondria in PBMCs. Conclusions:Age-related mitochondrial oxidative respiration in PBMCs can reflect changes in muscle strength and muscle mass and, combined with grip strength and ASM, may be considered as a biomarker for the evaluation of sarcopenia in the elderly.

OBJECTIVE: In this paper, the key points of quality control and safety evaluation of human assisted reproductive medium were summarized to provide reference for the establishment of relevant standards and quality control in the future. METHODS: Through literature research, the key factors of quality control and risk control of human assisted reproductive medium were summarized, and the problems in clinical transformation were discussed. RESULTS: It is very important for the development of human assisted reproduction technology to study the active ingredients and their harmful degradation products and drugs in the culture medium of assisted reproduction. CONCLUSIONS At present, the biggest challenge is to effectively control the quality of the culture medium for human assisted reproduction, establish corresponding inspection methods and quality standards for the key components, ensure the safety and effectiveness during the product shelf life, and thus improve the success rate of human assisted reproduction technology.
Humans ; Quality Control ; Reproduction ; Reproductive Techniques, Assisted