*
*
Whitson residence
Bio150 house
Biology department
ptcouncil.net residence



You are watching: All lipids share this characteristic.

Lipids Fats, oils, and waxes space all instances of lipids. Over there are numerous lipids, but they every share the properties of gift at least partially hydrophobic (meaning lock won"t mix v water). Water molecules are polar due to the fact that they have positive and an adverse ends, rather like small magnets. Many lipids space non-polar (having no charged areas) or just slightly polar, through a very couple of charged areas. Water mixes with hydrophilic (water-loving) compound by difficult to your charged groups. Due to the fact that lipids absence charged groups, the water molecules have nothing come stick to and don"t mix through them. (Think of make the efforts to pick up a glass marble with a magnet). Lipids deserve to be put in three major groups: triglycerides (fats & oils), phospholipids (making up cell membranes), and also steroids (many hormones).

Testing the Polarity the Lipids We have the right to use chromatography to different out mixture of chemicals and tell united state something around their properties. Drops of unknowns are blotted near the bottom the a color layer analyzer strip. The basic of the strip is collection in a solvent, and also the solvent soaks its method up the strip favor water move up a sponge. The solvent likewise takes several of the unknowns together with it. Chemicals v a polarity comparable to the solvent will certainly be liquified by it and also move along the solvent front. Little molecules will relocate along much faster than large ones. By looking at how far various chemicals move along the strip, you can gain a feeling for exactly how polar lock are and sometimes additionally how huge they are. In this case, we placed three unknowns on a color layer analyzer strip: a phospholipid, a triglyceride, and a fatty acid. Our score is to sort out i m sorry is which based on their properties. Our solvent is non-polar, and so have to mix fine with various other non-polar substances and also carry them in addition to it. We know that the an ext polar a compound, the tighter it should stick come the silica that the color layer analyzer strip. Phospholipids shouldn"t move at all from where they are inserted on the strip, whereas triglycerides room non-polar and shouldn"t pole at all to the strip. Fat acids should autumn somewhere in between.

*



See more: Towing Ratings For 1999 Dodge Ram 1500 Towing Capacity, 1999 Dodge Ram 1500 Heavy Towing (10,000 Lbs+)

Rf Values

Rf A = 2.4 cm/ 6.5 cm = 0.4 Rf B = 0 cm/ 6.5 cm= 0.0Rf C =4.3 cm/ 6.5 cm= 0.7 Note: dimensions are taken from the center of the darkest blotch in every lane.


*

Calculations: Rf worths

Rf values are a numerical means of to compare the movement of various substances follow me a color layer analyzer strip. The Rf is equal to the total distance a substance travel (measure from the center of the blotch) divided by the total distance the solvent prior moved. A substance the didn"t move at all would have actually an Rf of zero, while a problem that relocated right v the solvent front would have actually an Rf the one. ranges can it is in calculated native the photo over by individually the final allude to i beg your pardon something traveled from the suggest at which that started. Because that example, samples were blotted on in ~ the 8.3 centimeter mark and also the solvent stopped at the 1.8 centimeter mark. The solvent thus traveled 6.5 cm (or 8.3 cm - 1.8 cm).

Class chromatography Results based upon class results, C relocated fastest, A next fastest, and also B didn"t relocate (though you deserve to see some smudging in all lanes from impurities). Thus, C need to be non-polar like our solvent, A contempt polar, and also B for this reason polar that it couldn"t be relocated off the silica. Triglycerides room non-polar, and also should dissolve instantly in our non-polar solvent. Thus, C seems prefer a great candidate for our triglyceride sample. Phospholipids need to adhere to the silica, which appears to enhance up v lane B. Fatty acids are slightly polar, i m sorry is the ideal match for lane A. have the right to you see just how the amount of polarity a substance has correlates through how rapid it move up the color layer analyzer strip?