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Then analysis was done by injecting a 1 ll aliquot in a splitless mode into a Hewlett Packard 6890 gas chromatograph (Avondale, PA, USA) equipped with a flame-ionization detector and a DB-5 fused-silica capillary column (30 m 0:32 mm i.d.; film thickness 1 lm; J&W Scientific, Folsom, CA, USA). Injector and detector temperatures were set at 300 C. Oven initiating temperature was at 190 C, elevated to 215 C at 6 C/min, and then increased up to 300 C at 32 C/min, held for 3 min. Nitrogen was used as a carrier gas. The percentage yield (percent weight conversion) was defined as ðmg biodiesel mg initial soybean oilÞ 100% and was estimated using peak area integrated by on-line software Hewlett-Packard 3365 Series II ChemStation (Avondale, PA, USA). Õª×Ô------ ÆÚ¿¯£ºBioresource Technology 88 (2003) 103¨C106 ÎÄÕÂÌâÄ¿£ºOptimization of lipase-catalyzed biodiesel by response surface methodology ×Ô¼º¿´¿´°É£¬ºÇºÇ |

3Â¥2007-06-17 21:41:48
flydyyfx
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2Â¥2007-06-10 22:43:10













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