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Objective Establishment of a capillary column headspacesampling program for Gas chromatography determination of ethanol residuein Isosorbide Mononitrate sustained-release tablets. Methods A capillarycolumn $\left({{30}\mathrm{\;m}\times {0.320}\mathrm{\;{mm}},{0.25\mu}\mathrm{m}}\right)$ with $6\%$ cyanopropylphenyl-94%dimethylpolysiloxane (or similar polarity) as stationary solution wasused. The starting temperature was ${50}^{\circ }\mathrm{C}$ and maintainedfor $6\mathrm{\;{min}}$ , thetemperature of the detector was ${250}^{\circ }\mathrm{C}$ , thetemperature of the inlet was ${200}^{\circ }\mathrm{C}$ , theequilibrium temperature of the headspace bottle was ${80}^{\circ }\mathrm{C}$ , the equilibriumtime was ${30}\mathrm{\;{min}}$ , theflow rate of nitrogen was $1\mathrm{\;{mL}}/\mathrm{{min}}$ , and thetemperature of the headspace bottle was ${200}^{\circ }\mathrm{C}$ . The shuntratio was ${50}: 1$ . Results Underthe above chromatographic conditions, the retention time of ethanol was $3\mathrm{\;{min}}$ and theconcentration of ethanol was in the range of ${0.43}\sim {10.8\mu}\mathrm{g}/\mathrm{{mL}}$ . The recoveries were ${87.04}\%\sim {94.45}\%,\mathrm{{RSD}}={0.17}\%\left({n = 6}\right)$ .
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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