Explain how the (±)-lactic acid could be separated into its pure enantiomers by using (R)-1- phenylethylamine as the resolving agent.

Saccharide Y is a tetrasaccharide. To determine its linkages, glycopeptide X was exhaustively methylated, effectively methylating saccharide Y. Cleavage gave a polypeptide and the following products: 2,3,4-tri-O-methyl-a-D-glucopyranoside acid, 2,3- di-O-methyl-ß-D-glucopyranoside, 1,3,4-tri-O-methyl-ß-D-glucuronic acid and 1,4,6-tri-O- methyl-ß-D-N-acetylgalactosamine. Further treatments to the isolated tetrasaccharide gave the following results: A. Treatment of saccharide Y with an a-1,4 glycosidase gave a trisaccharide and glucopyranose B. Treatment of saccharide Y with a 2,6-glycosidase also gave a trisaccharide and glucuronic acid. Draw the structure of the saccharide.

I have an aqueous solution of tyrosinase but I require the solid form of tyrosinase.   How would you process the aqueous solution to obtain the solid form?

Calculate and draw the isoelectric point of the tetrapeptide Ser-Leu-Phe-Pro at pH 7.0. hand written please

Draw a ceramide with a (16:1n-7) fatty acid attached

Complete the following table by providing the Fischer and Haworth Projections of the given sugars. (Please be careful with the alpha and beta, and the complete and abbreviated) (not a graded question) Sugar Fischer Projection Haworth Projection (Complete) alpha-anomer Haworth Projection (Abbreviated) beta-anomer L-Galactose       L-Fructose

Consult Table 18.3 and draw alanine. Label the functional groups and give the three-letter abbreviation and the one-letter abbreviation. What group does the side chain fall into?

Draw the structures of the following compounds. (Includes both new and old names.) 3-cyclopentylhexan-3-ol

92.11

Draw the structure of Pro-Leu-Glu at physiological pH (7.4).