Determination of Carbonyl Groups in Starches by Polarographic Techniques Using o‐Phenylenediamine III. Separation of 2‐Methylquinoxaline from Reaction Mixtures by Extraction or Chromatographic Techniques

Gas-Liquid Chromatography and Mass Spectrometry of Quinoxalines Derived from Various Homoglucans by Alkalineo-Phenylenediamine Method

“…A quinoxaline having one whole glucose residue in its side chain structure should be formed, when the alkaline degradation proceeds along the main a-1,4 glucosidic chain of amylose, if there is a glucose unit with an a- 1,6 linked glucose residue 19 ,20) as a branch, in a similar manner to scleroglucan. The determination limit of these minor components of carbohydrates, i.e., rt-1,6 linked branches, by the present alkaline OPD method may depend on the pretreatment of the sample, followed by the use of separation techniques for quinoxaline derivatives by GLC analysis.…”

Organic polarography

“…Other quantitative polarographic procedures were reported for reducing sugars (105), saccharin in nonalcoholic beverages (879), for 3-keto sugars (985), and for glucose using an 02electrode and glucose oxidase (401, 412, 688,684). Carbonyl groups in starches and related carbohydrates after reaction with o-phenylenediamine were analyzed polarographically (887)(888)(889)(890).…”

“…Eighteen phenothiazine derivatives were analyzed by ac and dc polarography (889). The reduction of diazaphenothiazine derivatives was described (699).…”