Resource, Materials and Environment Lesson 2: Food Chemistry ponents Protein: Amino acids, Peptide and Polypetide Carbohydrates Fats and oils Food Additives Food Production Proteins proteins are essential parts of all anisms Amino acids Building blocks for protein Properties of amino acids Differentiation of amino acids, techniques Chromatography and electrophoresis Peptide bond Dehydration synthesis (condensation) reaction forming a peptide group Peptides are synthesized by coupling the carboxyl group or C-terminus of one amino acid to the amino group or N-terminus of another. Peptide group Properties of amino acids Due to the co-existence of the NH3+and the COO-, amino acids exhibit amphoteric behaviour, for instance alanine reacts both with acids and bases; There are twenty standard amino acids proteins by living cells. Different sequencing of amino acids results in different type of proteins. Properties of amino acids Amino Acid is slightly acidic. For alanine, the following reaction occurs in pure water: Properties of amino acids Isoelectric point The pH at which an amino acid carries electric charge, this quantity can be determined by an analytical technique called electrophoresis Isoelectric Point
Resource, Materials and Environment 来自淘豆网m.daumloan.com转载请标明出处.
