can pesticides used in sugarcane be detected in the final sugar product?
483492
Of the three answers given go with the second one.  Sugar is made through a process of washing, cooking, and crystallization into its final, refined form.  Any residual pesticide can be detected by standard testing techniques like gas chromatography.\n\nIs it possible that some miniscule amount of pesticide does get into the sugar?  Yes, but it is probably so low in concentration that it is way below government standards.  As for the drek about "invisible forces" keeping chemists from doing their jobs, take all such answers for the nonsense that they are.
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White sugar has had all nutrients bleached out of it.\nBrown sugar still retains some nutrients even after processing\nBrown is better.
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Yes!\n\nComparison of the Ammonium Oxalate Extraction of Fertilizer for K2O, Method 983.02, with the Ammonium Citrate/EDTA Extraction, Method 993.31 \nNatalie F. Newlon \n\nThe direct available method for phosphorus in fertilizers, Method 960.03, is an Official Method for extraction of both P2O5 and K2O. Because K2O is much more soluble and easier to extract than P2O5, the conditions of the extraction procedure are set for efficient extraction of P2O5, and the extraction of K2O is, in effect, a bonus. In 1993, a modified extraction procedure, using an extractant of ammonium citrate/ethylenediaminetetraacetic acid (EDTA) solution, was evaluated for P2O5 and then collaboratively studied. This now-modified extraction procedure for phosphorus is Official Method 993.31, which is used extensively as an alternative to Method 960.03 for phosphorus because it is less labor-intensive. Method 993.31 was also evaluated in our laboratory for K2O extraction, but it was never formally collaboratively studied for K2O. To demonstrate the suitability of Method 993.31 as an extraction procedure for K2O, as well as P2O5 in fertilizers, Method 993.31 extraction for K2O was compared with Method 983.02, the traditional ammonium oxalate extraction procedure for K2O. A wide range of fertilizer samples was extracted by using both procedures. The t-test for samples containing <30% K2O had a t-value of 1.23 and a probability of 0.22, which indicates there was no significant difference in the results obtained by the 2 extraction methods. The t-test for samples containing >30% K2O had a t-value of 0.30 and a probability of 0.77, also indicating no significant difference. It is recommended that Method 983.02 be modified to include the ammonium citrate/EDTA extraction procedure as an additional option for extraction of K2O from commercial fertilizers.
999393
Most common method would be an oxidative digestion (most likely using ultraviolet radiation) in order to eliminate the organic matrix, and subsequent simultaneous ICP-OES analytics. Numerous other detection methods are available (electrochemistry, mass spectroscopy, atom absorption spectroscopy, even classical wet chemistry might give satisfactory results if done with extreme care and insight).\n\nThe heavy metals would be the usual suspects also monitored in drinking water, with special emphasis on any material used or present as impurity in the packaging (tin, lead, cadmium, zinc...)
980626
ChemDraw from CambridgeSoft Corporation may be help you. Look at www.cambridgesoft.com
125022
General Color Tests for Carbohydrates\n\nCarbohydrates are dehydrated when treated with strong mineral acids under non-oxidizing conditions. The free or potentially free aldehyde or ketonic groups of monosaccharides and certain disaccharides are readily oxidized by mildly alkaline solutions of cupric ions; such as Benedict's reagent ( copper sulfate, sodium carbonate, and sodium citrate ). These carbohydrates are called reducing sugars because they reduce cupric (Cu+2)ions to form cuprous (Cu+1) oxide, Cu2O, a yellow to brick-red precipitate. The aldoses are oxidized to aldonic acids (glucose forms gluconic acid), as well as other products. The ketoses yield a mixture of lower molecular weight oxidation products.\n\nProcedure:\n\nBring in different samples of carbohydrates, such as sugars, starches, fruits, vegetables, cookies rice, pasta, beans etc. \n\nWhen performing the following test, run a control tube for each.\n\nMolisch test: a general for carbohydrates.\n\nTo three separate test tubes, add 10 drops of 1% solutions of glucose, sucrose and starch, and dilute each sugar solution with 2 ml. of water. Add 2 drops of alpha naphthol solution (dissolve 10g alpha naphthol in 100 ml. 95% ethyl alcohol ) to each tube and mix. Incline the test tube and slowly and carefully add 3 ml. of concentrated sulfuric acid down the side of the tube to form a layer below the sugar solution. A purple ring at the interface is indicative of a carbohydrate. Additional tests can be performed on apples, celery petioles, carrots, grapes, and onions. \n\nBarfoed's test: a general test to distinguish between monosaccharides and disaccharides. \n\nTo 5 ml. of Barfoed's reagent (dissolve 66.5g of neutral, crystallized copper acetate in 800 ml. of water and add 6 ml. of glacial acetic acid, and make to one liter ), in separate test tubes, add 5 ml. of the 1% carbohydrate solutions, shake the contents of each tube well, and place all of the tubes at the same time in an actively boiling water bath. Heat for 3.5 min. after the water starts boiling again. Timing is important since a false positive test can be obtained for monosaccharides with disaccharides, if the disaccharides are heated for more than 3.5 minutes thereby breaking down ( hydrolyzing ) to monosaccharides. During this period observe the tubes closely and note any change or clarity of the solutions. A positive test for monosaccharides is the appearance of a red precipitate of Cu2O within 1 or 2 minutes, if no precipitate forms it indicates the presence of a disaccharide. Record the time if a reaction ( turbidity )precipitate occurs. For purposes of comparison, it is helpful to make a control tube with 5 ml. of water in place of the sugar.\n\nBenedict's test for Reducing sugars:\n\nPerform the tests on the 1% carbohydrate solutions. Add 5 ml. of Benedict's reagent and 2 ml. of carbohydrate to a test tube and shake each tube thoroughly. Place all tubes in a boiling water bath at the same time. Heat in the water bath for 5-6 min. and observe what happens. Record any changes in color, in the transparencies and in the formation and color of any precipitate.\n\nAdd 4-5 drops of 3M HCl to 5 ml. of 1% sucrose solution and heat in the boiling water bath for 5 min. Treat the 1% starch solution in the same way but extend the heating period to 25-30 min. Apply Benedict's test to 1-2 ml. of each solution in the same manner as before. Compare the results with those obtained without acid treatment.\n\nBial's Orcinol test distiguishes a pentose ( 5 carbons ) from a hexose ( 6 carbons ) monosaccharide.\n\nPipet 4 ml. of each carbohydrate ( 1% solutions ) into separate test tubes. Add 2 ml. of Bial's reagent ( dissolve 6g orcinol in 200 ml. 95% ethanol. Then add 40 drops of 10% FeCl3.6H2O solution ) followed by 5 ml. of concentrated HCl to all the tubes. Mix and stopper the tubes with cotton and heat in a boiling water bath for 10 min. A positive reaction for a pentos is indicat
282990
pesticide analysis is usually done either by GC or HPLC.
230507
This is a common urban myth that high schoolers love to threaten each other with. From the little research I did on the web I say it is a lie. Due to the fact that sugar is not readily soluble in gasoline it would do nothing more than clog the filter sock on the fuel pump and possibly the fuel filter. If sugar did make it to the engine it would probably do nothing more than a little sand would do once making it that far. I have never had to drop a tank and clean it out because of sugar contamination. I am not sure about sugars solubiltiy in ethyl alcohol (ethanol) though so I may be wrong on this one. Anyways If you really wanted to inconvenience someone just put water in their tank it would be a lot easier to do and a lot harder to detect. Also they would probably just blame it on the gas station.
887348
Suspected carcinogens.
235360
sucrose is a non reducing sugar so it will not give a positive red result. You need to boil it with acid to hydrolyse it then it will give a positive result.
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The responses of microorganisms to growth-inhibiting salt concentrations have been studied extensively. In a number of cases, the effects of both salt and sugar stress on the accumulation of individual compatible solutes such as K+ and glycine betaine have been determined. However, only in a few studies have the osmolytes accumulated in salt-stressed cells been compared with those in sugar (nonionic)-stressed cells
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Starch is not very soluble in water.\n\nMost important, however, is the type of assay used for glucose. A simple oxidation reaction would not be glucose specific... it would work just as well on any reducing sugar. Instead, the standard assays for glucose are enzymatic. You transform glucose into something which absorbs light and measure with a photometric spectrometer.\n\nEnzymes that have glucose as a substrate will not act on starch.
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As no one else has had a go, i will. \n\nCellulase should produce glucose, so you are needing a method to analyse the amount of glucose formed. \n\nIf you have access to a blood glucose monitor, this would be the simplest way. Otherwise, the reaction between glucose and Benedicts solution is quantitative, and you could weigh the amount of Cu2O formed.
932310
Check the carb content on the label...you'll be surprised how much sugar is in it!
108473
due to less production of sugarcane growth
784733
a. sugar dissolves into water and the sand can then be filtered out.\n\nb. can be distilled\n\ni'd have to look up the rest. post them when you find them, I'd like to know!
481495
1. Perform vacuum distillation.  Place the solution in a vacuum flask; apply vacuum (removing air from vessel); apply heat and "boil" the water off.  Collect the condensate and measure its volume.  Weigh the remaining sugar that is left behind in the vacuum flask.\n  -or -\n2. There may be a way to measure the refractive index of the sugar solution.\n-or-\n3. Heat a sample of the solution to determine the boiling point elevation; if you have a table that compares molarity vs. boiling point elevation, you may be able to determine the molarity of the solution by knowing at what temp. the solution boils.\n\n4. You may be able to extrapolate by weighing exactly one cubic centimeter (cc) (volume) of the solution at 25 degrees C.  There may be a table comparing weight of a 1 cc solution at that temp (as the density of 1 cc of water is different than a 1cc sugar solution.