ABSTRACT
A new method was proposed for analysis of the organic compounds in cigarette smoke by high resolution Orbitrap mass spectrometry based on polyacrylonitrile-silica (PAN-SiO2) nanofiber membrane extraction and methanol elution.Hydrophobic PAN-SiO2 nanofiber membrane which was used to enrich small molecular organic compounds in cigarette smoke was prepared by the technology of electrospinning.Several parameters including the concentrations of PAN and SiO2 nanopartical,elecrospining voltage,needle aperture and flow rate of spinning solution were optimized.Under the optimal conditions,a PAN-SiO2 nanofiber membrane with good adsorption performance and great physical strength was obtained.A total of 21 compounds including acetone,styrene,acrolein,isoprene,and acrylonitrile were identified by analyzing the cigarette smoke with Orbitrap MS spectrometry in the positive ion mode.Six organic acids including salicylic acid,malic acid and lactic acid were detected in negative ion mode.The limits of detection and quantification for nicotine were 0.071 ng/L and 0.236 ng/L,respectively.
ABSTRACT
OBJECTIVE@#To investigate effect of hyperbaric oxygen (HBO) therapy on treatment of late healed wounds after pharyngeal and laryngeal carcinomas surgery.@*METHOD@#Eighty-three patients with late healed wounds after pharyngolaryngectomy were divided into two groups, which were HBO treatment group (n = 48) and control group (n = 35) by random. 48 cases were treated with the general therapeutic measure along with HBO (the pressure is 2 x 10(5) Pa, 110 minutes per day for 5 to 10 days). The other 35 cases were treated with the general therapy without HBO as control.@*RESULT@#There were fresh granulation erupted from the wound of entry after 3 or 4 days of HBO) treatment, then the granulation and the new blood capillary erupted continually to fill the wound surface, and the wound of entry was healed over finally. In the HBO and the control groups, the average healing time was 27.50 and 45.00 days (P < 0.01) in the wound by necrosectomy of the myocutaneous flap or forearm flap, 8. 50 and 14.09 days (P < 0.01) in the pharyngeal fistula, 5.93 and 8.62 days (P < 0.01) in the infected or fluid-filled wound.@*CONCLUSION@#HBO therapy is an effective and powerful treatment for late healed postoperative wounds in pharyngeal and laryngeal carcinomas surgery.
Subject(s)
Adult , Aged , Female , Humans , Male , Middle Aged , Hyperbaric Oxygenation , Laryngeal Neoplasms , General Surgery , Therapeutics , Otorhinolaryngologic Surgical Procedures , Postoperative Period , Treatment Outcome , Wound HealingABSTRACT
OBJECTIVE@#To investigate the expression and significance of vascular cell adhesion molecule-1 (VCAM-1) and P-selectin in hypopharyngeal carcinoma, and explore the relationship of VCAM-1, P-selectin and microvessel density (MVD).@*METHOD@#Expression of VCAM-1 and P-selectin were detected by immunohistochemistry staining in 40 specimens of hypopharyngeal carcinoma and 10 specimens of normal mucosa of oral pharynx. MVD was assessed based on the expression of CD34.@*RESULT@#VCAM-1 and P-selectin were detected in 26 out of 40 (65%) and 29 out of 40 (72.5%) respectively in hypopharyngeal carcinoma, but none that in normal mucosa (P<0.01). MVD in hypopharyngeal carcinoma was higher than that in normal mucosa and it was related to lymph node metastasis. MVD level was significantly higher in VCAM-1 and P-selectin-positive specimens than in negative ones (P<0.01), which also positively correlated with the expression of VCAM-1 and P-selectin (P<0.01). The expression of P-selectin positively correlated with VCAM-1 in hypopharyngeal carcinoma specimens with lymph node metastasis.@*CONCLUSION@#The higher expression of VCAM-1 and P-selectin play key roles in the invasion and metastasis of hypopharyngeal carcinoma and were correlated with vascularization.