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- Which of the following combination in each pair is likely to produce more Maillard browning when heated at 95 °C for 4 hours? Explain the chemical basis for your choice. Sucrose + glycine, pH 7.0 vs. glucose + glycine, pH 7.0 Maltose with a dextrose equivalency (DE) of 20 + glycine, pH 9.0 vs. maltose + glycine, pH 9.0 Lactose + glycine, pH 8.0 vs. lactose + glycine, pH 4.0A hydrocarbon of unknown structure has the formula C8H10. On catalytic hydrogenation over the Lindlar catalyst, 1 equivalent of Η2 is absorbed. On hydrogenation overa palladium catalyst, 3 equivalents of Η2 are absorbed. (a) How many degrees of unsaturation are present in the unknown structure? (b) How many triple bonds are Present? (c) How many double bonds are present? (d) How many rings are present? (e) Draw a structure that fits the data.An oligosaccharide isolated from an organism is found tocontain two glucose residues and one galactose residue.Exhaustive methylation followed by hydrolysis producedtwo glucoses with methoxy groups at positions 2, 3,and 6 and galactose with methoxy groups at positions2, 3, 4, and 6. What is the structure of the originaloligosaccharide?
- Identify the organic functional group(s) of the reactant, the reaction type, and predict the functional group(s) of the product(s) then draw the major product(s) The reactant is:a. deoxytetroseb. alcohol pentosec. ketohexosed. aldotriosee. aldopentoseThe reaction type is:a. acetal formationb. oxidation (benedict's)c. hemiacetal formationd. acetal hydrolysise. reduction (hydrogenation)f. mutarotationThe product should be:a. alpha 1-4 disaccharideb. deoxyhexosec. carboxylic acid pentosed. alcohol pentosee. alpha pyranosef. no reactionAn aldopentose "O", is oxidized with HNO3 to a diacid "P" which is optically active. The compound "O", is also degraded to an aldotetrose "Q" which undergoes another oxidation to an optically inactive diacid "R". Assuming that "O" has the configuration D-(4R); what are the structures of "O" to "R"?Predict the products obtained when d-galactose reacts with each reagent.(a) Br2 and H2O (b) NaOH, H2O (c) CH3OH, H + (d) Ag(NH3) 2+ -OH(e) H2, Ni (f) excess Ac2O and pyridine (g) excess CH3 I, Ag2O (h) NaBH4(i) Br2, H2O, then H2O2 and Fe2(SO4)3 (j) (1) KCN/HCN; (2) H2, Pd/BaSO4; (3) H3O! (k) excess HIO42
- When d-fructose is dissolved in D2O and the solution is made basic, the d-fructose recovered from the solution has an average of 1.7 deuterium atomsattached to the C-1 carbon per molecule. Show the mechanism that accounts for the incorporation of these deuterium atoms into d-fructose.I. True or False ____________7] Salivary amylase can be use to hydrolyze 1,4 glycosidic bonds of cellulose.____________8] Lobry de Bruyn-van Ekenstein Transformation take place when a sugar is treated with a strongly basic reagent.Which of the following combination in each pair is likely to produce more Maillard browning when heated at 95 °C for 4 hours? Explain the chemical basis for your choice. A.Sucrose + glycine, pH 7.0 vs. glucose + glycine, pH 7.0 B.Maltose with a dextrose equivalency (DE) of 20 + glycine, pH 9.0 vs. maltose + glycine, pH 9.0 C.Lactose + glycine, pH 8.0 vs. lactose + glycine, pH 4.0 Please answer very soon will give rating surely All questions answers needed
- Reaction a) maltose (s) + H2O (l) -----> 2 glucose (s) Reaction b) 6 CO2 (g) + 6 H2O (l) -------> glucose (s) + 6 O2 (g) How would you manipulate reactions a) and b) to ended up with the reaction c) ? Reaction c) maltose (s) + 12 O2 (g) -------> 12 CO2 (g) + 11 H2O (l)Polyunsaturated fatty acids (PUFA's) in oils 0.g. sunflower oil are prone to rancidity because they contain conjugated double bond systems which are easily oxidized in the presence of light or peroxides. BHT Is used as an antioxidant in oils to prevent oxidative rancidity. How do BHT prevent oils from reacting with peroxides so that they do not become rancid? Show the mechanism.For D-lyxose i. Draw an epimer at C3. ii. Draw a diastereomer that is not an epimer. iii. Draw the anomers of -D-lyxofuranose and -D-lyxopyranose. iv. Draw the product as Haworth projection when reacted with methanol catalysed by acid.