Recognition of simple sugars
- 1. Recognition of simple sugars<br />Members:<br />Valeria Sánchez Vélez<br />María Paula Rivera Villabona<br />Laura Torres Figueroa<br />María Isabel Cifuentes Jiménez <br />Introduction:<br />Monosaccharides are crystalline compounds, soluble in water, sweat to taste, and needs digestion in order to be absorbed into the blood steam. They may contain either five carbons (pentose) or six carbons (hexodes).<br />Disaccharides are crystalline, water-soluble, sweet to taste, and must be digested to monosaccharide before they can be absorbed and used for energy. These are a combination of two monosaccharides.<br />Polysaccharides are not water soluble and are not crystalline. They form colloidal suspensions instead of solutions. They are not sweet and must be digested before being absorbed. They are made of many monosaccharides or disaccharides joined together.<br />Benedict`s test allows detect the presence of reducing sugars. All monosaccharides are reducing sugars; they all have a free reactive carbonyl group. Some disaccharides have exposed carbonyl groups and are also reducing sugars, other disaccharides (sucrose) are non reducing sugars and will not react with Benedict`s solution; Colours depend on how much of this precipitate was formed, colour shows how much reducing sugar was presented.<br />634365184785<br />Sweetness is one of the five basic tastes and it is almost universally regarded as a pleasurable experience.<br />Materials:<br />Unknown solution A<br />Unknown solution B<br />Unknown solution C<br />Pipette<br />3 test tubes<br />Benedict`s solution <br />Burner<br />Lab coat<br />Lab guide<br />Objective:<br />Recognize simple sugars dissolved in unknown solutions<br />Results:<br />UnknownBenedict`s testSweetnessAOrange colourVery sweetBGreen colourBitterCMaintain its colourNeutral<br />Procedure:<br />We drop the solutions into the test tubes with the pipette<br />We drop 5ml of Benedict`s solution in each test tube and mix it with each solution<br />We heated each test tube in the burner in order to see each solutions reaction<br />We observed that solution A turned into orange colour, solution B into green colour and solution C maintain its colour<br />Conclusions:<br /> <br />Solution A is a monosaccharide, because it change its colour and the Benedict`s test was of recognition of monosaccharides.<br />Solution B is a monosaccharide, because it change its colour and the Benedict`s test was of recognition of monosaccharides.<br />Solution C is a polysaccharide, because it didn`t changed its colour.<br />Bibliography:<br />E-Bio LabActivity guide<br />Campbell-Reece , Biology, 6 Edition<br />http://www.biosci.ohiou.edu/introbioslab/Bios170/170_2/benedict.htm<br />http://en.wikipedia.org/wiki/Sweetness<br />