Vitamin C is found naturally in a number of fruits, particularly citrus fruits. It is also an organic compound that can be synthesized in the laboratory. Is there any difference between the natural material and the synthetic material in terms of structure and chemical behavior that would depend upon its source?
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Vitamin C is found naturally in a number of fruits, particularly citrus fruits. It is also an organic
compound that can be synthesized in the laboratory. Is there any difference between the natural
material and the synthetic material in terms of structure and chemical behavior that would depend
upon its source?
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- Organic polymers have a similar composition to that of common carbohydrates(predominantly composed of Carbon, Hydrogen and Oxygen atoms). By principle, somecarbohydrates readily react with oxygen gas to produce carbon dioxide and water vapor,explain why this principle doesn’t spontaneously work on organic polymer wastes such asPolyethylene terepththalate (PET) and Polystyrene (PS)?Copper ions present in Benedict’s reagent react with the free end of any reducing sugars, such as glucose, when heated. Originally blue in color, these copper ions are reduced by the sugar and produce an orange-red colored precipitate. Alternatively, iodine-potassium iodide (IKI) may also be used when working with starch. IKI contains special tri-iodine ions which interact with the coiled structure of a starch polymer. Prior to a reaction, the IKI displays a yellow-brown color; however, after reacting with starch, a dark purple or black color is presented. The molecule pictured below produced a blue color when tested with Benedict’s reagent, a yellow color when tested with IKI, and a violet color when tested with Biuret reagent. Based on the structure shown below and these chemical results, what kind of biomolecule is this?One of the main sources of sphingosine in the body is in the cell membrane. What complication could arise from the biological synthesis of ceramide?
- Glucose is a reducing sugar while sucrose is a non-reducing sugar. What could possibly be the chemical structure present in a sugar that renders it reducing or non-reducing?A researcher wishes to obtain a glycoside (an organic compound) from an aqueous plant extract using the solvent extraction technique. She therefore performs the following steps: Step 1: An aqueous solution (100 mL) containing 7 g of the glycoside was shaken with 50 mL of ethyl acetate. Step 2: The resulting aqueous layer from Step 1 was further shaken with 50 mL of dichloromethane. Given that: Kp for the glycoside in ethyl acetate-water = 0.8 Kp for the glycoside in dichloromethane-water = 0.9 Calculate the total mass of glycoside extracted. If the molar mass of the glycoside = 784.3 g/mol, calculate the molar concentration of the glycoside remaining in the aqueous layer after each extraction.One or more of the compounds shown below will satisfy each of the following statements. Not all compounds may be used; some may be used twice. Put the number(s) in the blank. (1) Found in chitin. (2) An L-saccharide. (3) The first residue attached to asparagine in N-linked glycans. (4) A uronic acid. (5) A ketose. CH,OH CoO COO OH H H H H ОН Н но OH OH H OH H HO OH H NHC- CH, Oso, OH (a) (b) (c) CH,OH CH,OH CH,OH C=0 CHOH C=0 H-C- OH CH,OH но -с-н ČH,OH CH,OH (d) (e)
- A food factory wants to test the film strength of different types of starch, but the film strength is affected by the film thickness, and it is difficult to control the film thickness during the production process. Only the thickness data of various film samples can be recorded, but when the manufacturer wants to test the film strength , the influence of film thickness can be excluded. How should the manufacturer design the experiment? In order to compare the strength of the film and exclude the influence of the thickness of the film, how should the experiment be randomization?What does it mean for chitosan to have high bioadhesive properties? In which areas is this feature important for the use of this natural polymer? Explain with an example. b) What properties of chitosan make it possible to use it in different tissue engineering applications? Give an exampleSorbitol is a sweetener often substituted for cane sugar, because it is better tolerated by diabetics. It is also an intermediate in the commercial synthesis of vitamin C. Sorbitol is prepared by high-pressure hydrogenation of glucose over a nickel catalyst. What is the structure (including stereochemistry) of sorbitol?
- The molecular structure of vitamin A is conjugated with N = 10. Calculatethe wavelength of light in the first transition of vitamin A.please explain The porosity of the PAGE gel is determined by the ratio of acrylamide and the amount of .............................. (TEMD, bis-acrylamide, SDS, Glycine, Coomassie blue, iodocetate acetate, His tag, ammonium persulfate)(a) What is a reducing sugar? (b) Give an example of a reducing sugar (c) What test can be used to confirm a reducing sugar?