Essential oil, with more than thirty kinds of compounds separated and identified by gas chromatography-mass spectrometry, was extracted from Shatian shaddock peel and Sweet shaddock peel by squeeze-steam distillation ...Essential oil, with more than thirty kinds of compounds separated and identified by gas chromatography-mass spectrometry, was extracted from Shatian shaddock peel and Sweet shaddock peel by squeeze-steam distillation and direct steam distillation method. Among their composition, the main components are terpene compounds, which account for 93.926% (mass fraction, the same below) and 85.843% of essential oils extracted from Shatian shaddock peel and Sweet shaddock peel, respectively. Although nootkatone is the major contributor of shaddock characteristic scent, and its contents are 1.069% and 1.749% of essential oils from Sweet shaddock peel and Shatian shaddock peel, respectively. The results show that squeeze-steam distillation gives higher yield and good quality of essential oil and the compositions of essential oils from two kinds of shaddock peels are different, but the main contributors of the shaddock scent are the same.展开更多
The rheological analysis on dynamic shear rate-viscosity relationship of tea-oil extracted from tea-oil tree seeds by supercritical extraction method was carried out at gradient temperatures and constant shear rate,re...The rheological analysis on dynamic shear rate-viscosity relationship of tea-oil extracted from tea-oil tree seeds by supercritical extraction method was carried out at gradient temperatures and constant shear rate,respectively.The results show that at 20,40,60 and 80 ℃,once the shear rate increases gradually,the torque enlarges correspondingly,while the viscosity shows little difference.However,at the constant shear rate,the rising temperature results in a steady downtrend on tea-oil viscosity.This results reveal that tea-oil viscosity is not closely correlated with shear rate at constant temperature,yet negatively correlated with temperature at constant shear rate.展开更多
Crude palm Oil (CPO) processing is very popular in African Countries. In Cameroon, various actors are involved ranging from agro-industrial complexes to traditional processing by smallholders who use very inefficient ...Crude palm Oil (CPO) processing is very popular in African Countries. In Cameroon, various actors are involved ranging from agro-industrial complexes to traditional processing by smallholders who use very inefficient equipment and thus have low oil extraction rates. Small-scale processing by smallholders dates back to the early 1980s and has witnessed a lot of changes as a result of new actors in the sector, changing technologies and to an extent, government policies. This paper attempts a review of the origins and evolution of small-scale palm oil processing using intermediate technology, highlighting its importance to both the farmer and the national economy. An attempt is made to look into the future of this activity, with proposals for its consolidation.展开更多
采用超声波以及微波辅助萃取火麻籽油,通过单因素实验确定最佳工艺条件,比较不同萃取方法的油脂收率。通过气质联用仪(GC–MS)测定油品中α–亚麻酸的含量。实验结果表明:超声波辅助萃取火麻籽油最佳工艺条件为料液比1∶16(g/m L)、超...采用超声波以及微波辅助萃取火麻籽油,通过单因素实验确定最佳工艺条件,比较不同萃取方法的油脂收率。通过气质联用仪(GC–MS)测定油品中α–亚麻酸的含量。实验结果表明:超声波辅助萃取火麻籽油最佳工艺条件为料液比1∶16(g/m L)、超声波功率180 k W、萃取时间40 min和萃取温度20℃,此时油脂最大收率为36.49%;微波辅助萃取火麻籽油最佳工艺条件为料液比1∶16(g/m L)、微波功率800 k W、萃取时间8 min和萃取温度50℃,此时油脂最大收率为37.86%;超声波与微波辅助萃取油品中α–亚麻酸的含量分别为21.02%、26.39%。展开更多
文摘Essential oil, with more than thirty kinds of compounds separated and identified by gas chromatography-mass spectrometry, was extracted from Shatian shaddock peel and Sweet shaddock peel by squeeze-steam distillation and direct steam distillation method. Among their composition, the main components are terpene compounds, which account for 93.926% (mass fraction, the same below) and 85.843% of essential oils extracted from Shatian shaddock peel and Sweet shaddock peel, respectively. Although nootkatone is the major contributor of shaddock characteristic scent, and its contents are 1.069% and 1.749% of essential oils from Sweet shaddock peel and Shatian shaddock peel, respectively. The results show that squeeze-steam distillation gives higher yield and good quality of essential oil and the compositions of essential oils from two kinds of shaddock peels are different, but the main contributors of the shaddock scent are the same.
基金Projects(2007CB210201) supported by the Major State Basic Research Development Program of China
文摘The rheological analysis on dynamic shear rate-viscosity relationship of tea-oil extracted from tea-oil tree seeds by supercritical extraction method was carried out at gradient temperatures and constant shear rate,respectively.The results show that at 20,40,60 and 80 ℃,once the shear rate increases gradually,the torque enlarges correspondingly,while the viscosity shows little difference.However,at the constant shear rate,the rising temperature results in a steady downtrend on tea-oil viscosity.This results reveal that tea-oil viscosity is not closely correlated with shear rate at constant temperature,yet negatively correlated with temperature at constant shear rate.
文摘Crude palm Oil (CPO) processing is very popular in African Countries. In Cameroon, various actors are involved ranging from agro-industrial complexes to traditional processing by smallholders who use very inefficient equipment and thus have low oil extraction rates. Small-scale processing by smallholders dates back to the early 1980s and has witnessed a lot of changes as a result of new actors in the sector, changing technologies and to an extent, government policies. This paper attempts a review of the origins and evolution of small-scale palm oil processing using intermediate technology, highlighting its importance to both the farmer and the national economy. An attempt is made to look into the future of this activity, with proposals for its consolidation.
文摘采用超声波以及微波辅助萃取火麻籽油,通过单因素实验确定最佳工艺条件,比较不同萃取方法的油脂收率。通过气质联用仪(GC–MS)测定油品中α–亚麻酸的含量。实验结果表明:超声波辅助萃取火麻籽油最佳工艺条件为料液比1∶16(g/m L)、超声波功率180 k W、萃取时间40 min和萃取温度20℃,此时油脂最大收率为36.49%;微波辅助萃取火麻籽油最佳工艺条件为料液比1∶16(g/m L)、微波功率800 k W、萃取时间8 min和萃取温度50℃,此时油脂最大收率为37.86%;超声波与微波辅助萃取油品中α–亚麻酸的含量分别为21.02%、26.39%。
