1.Development and effect test of a portbable microorganism incubator
Hongjuan QI ; Yun SHI ; Yingya CHEN ; Peng GUO ; Lili WANG ; Rongzhang HAO ; Menghan GENG ; Xuelin LIU
Military Medical Sciences 2016;40(3):245-247
Objective To develop a portbable incubator for on-site cultivation of microorganisms in foods and drinking water.Methods Cultivation temperature was set as required by the temperature for various microorganisms and PID was controlled via the single chip microcomputer and configuration screen .Then, the framework of the incubator was designed and assembled.Finally, the cultivation effect was tested .Results The incubator was compact and portable .The deviation of the temperature was in the range of 1℃.The hold time of self-contained power could exceed 8 h.In addition, the cultivation effect of our fabricated incubator was not significantly different from that of the commercial electro-heating standing-temperature cultivator used in laboratories .Conclusion The incubator is suitable for on-site detection of microorganisms in foods and drinking water , which is significant for spotting and removing the hidden dangers from microorganism contaminations in foods and drinking water in order to protect the health of soldiers .
2. Determination of cyclohexanol in urine by headspace solid-phase microextraction coupled with gas chromatography
Wanting SU ; Yong MEI ; Geng ZHANG ; Hongmin GAO ; Menghan NIE ; Ruodan FANG
Chinese Journal of Industrial Hygiene and Occupational Diseases 2019;37(7):543-546
Objective:
To establish a method for determining cyclohexanol in urine by headspace solid-phase microextraction (HS/SPME) coupled with gas chromatography (GC) .
Methods:
After the urine sample was hydrolyzed by β-glucuronidase, 2.0 g of NaCl was added, then the analyte in urine was adsorbed by a CAR/PDMS solid phase micro-extraction head in a water bath at 50 ℃ for 20 min. And the extraction head was inserted into the gas chromatograph gasification chamber to desorb, the analyte was detected after separated by the capillary through the flame ionization detector.
Results:
The linear range of the method was 0.1-5.0 mg/L with the correlation coefficients (