FOOD 2400 Lecture Notes - Lecture 9: Hydroxy Group, Ketose, Glycosidic Bond
8 Sep 2017
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High levels of polar side chains (acidic and basic) increase the solubility of the protein: ex. Disulfide cross-links can form within and between peptide chains when sulfur amino acids are present (cystine, cysteine, and methionine: 8 essential amino acids for adults: In some cases, amino acids are grouped into four classes according to the polarity of the r side chain: nonpolar or hydrophobic side chains. In aqueous solution, at ph near neutrality, amino acids exist as zwitterions (german for dipolar (+ and -)) Egg albumin, ovalbumin: globulins: soluble in neutral dilute salt solution, ex. Myosin, d-lactoglobulin: glutelins: soluble in dilute acid or base, but not neutral solutions, ex. Glutenin from wheat: prolamines: soluble in 50-90% ethanol and insoluble in water, ex. Zien from corn, and gliadins from wheat: scleroproteins: insoluble in water or salt solutions, rich in glycine, alanine, and proline (structural proteins, ex.
