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- Elfman-Borjesson, I., et al.
(författare)
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Gradients of n-heptane and acetonitrile in silver-ion high-performance liquid chromatography analyses of cis and trans bonds in lipids
- 1997
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Ingår i: Journal of the American Oil Chemists Society. - 0003-021X .- 1558-9331. ; 74:9, s. 1177-1180
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Tidskriftsartikel (refereegranskat)abstract
- Cis and trans isomers of fatty acid methyl esters, fatty alcohols, and triacylglycerols were analyzed with a silver-ion high-performance liquid chromatography system. Gradients of n-heptane and acetonitrile were used to elute molecules with up to nine cis double bonds. The analyses were as fast and reliable and had a resolution similar to that of the best published analyses. However, published analyses were performed with chlorinated solvents, and these solvents are carcinogenic and mutagenic. The solvents we used, heptane and acetonitrile, are less dangerous to the analyst.
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| 4. |
- Härröd, Magnus
(författare)
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Apparent concentration. A method to predict the flow properties of viscous foods for process applications
- 1989
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Ingår i: Journal of food process engineering. - 0145-8876 .- 1745-4530. ; 11:4, s. 277-296
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Tidskriftsartikel (refereegranskat)abstract
- Compared with traditional methods, the prediction of flow properties of starch pastes is greatly improved with the new apparent concentration method proposed in this study. The new method considers the effects on the flow properties of minor variations in the preparation procedure and the composition of the product. The deviations with the new method range from ±10% for high-viscosity pastes down to -30% for low-viscosity pastes. The deviations are mainly due to the time dependency of the shear stress, as these effects are considerable for starch pastes, but have not been considered in the modelling in this work. Successful use of the apparent concentration method requires a reference model with known parameter values, a simple rheological measurement on the actual product, and appropriate calculations. The simple measurement can be performed on-line or in the laboratory. A special residual analysis was developed to make it possible to split up the differences between observed and predicted values and attribute the parts to the following factors.
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| 9. |
- Härröd, Magnus
(författare)
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Modelling of flow properties of starch pastes prepared by different procedures
- 1989
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Ingår i: Journal of food process engineering. - 0145-8876 .- 1745-4530. ; 11:4, s. 257-275
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Tidskriftsartikel (refereegranskat)abstract
- The flow properties of starch pastes prepared by different procedures were measured and modelled. An extended power law model was developed to describe the shear stress over wide ranges of shear rates, temperatures and concentrations (6-450 s-1, 10-90°C, 3-10%). Each pastes preparation procedure required its own set of parameter values to be modelled since different preparation procedures produced pastes with considerably different flow properties. These effects have to be considered before the flow properties can be predicted with satisfactory precision for process applications. Such a method is presented in a subsequent paper. The exactness in the modelling was restricted by the changes of the flow properties during the measuring process.
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