Determination of Carbonyl Groups in Starches by Polarographic Techniques Using <i>o</i>‐Phenylenediamine. IV. Relation between the Limiting Current of the Total Quinoxalines and the Molecular Size of Amyloses. A Rapid Determination Method of Molecular Weights of Amylose and Amylopectin

Takagi, Masanosuke; Nishio, Takeshi; Mizutani, Masanari; Kamatani, N.; Imaoka, Yoshio; Ono, Satoshi

doi:10.1002/star.19690210103

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1970

1975

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Determination of Carbonyl Groups in Starches by Polarographic Techniques Using o‐Phenylenediamine. V. Reactions of Periodate Oxidized Starches with o‐Phenylenediamine.

Takagi¹,

Mizutani²,

Nishio³

et al. 1970

Starch Stärke

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The reaction of oxyamylose with o‐phenylenediamine (OPD) in alkaline media produces quinoxalines which can be followed by polarographic method and the dialdehyde content can easily be determined polarographically. The lower limit of the determination of dialdehyde content may be 0.01 in the ratio of NaIO4/AGU. Quinoxalines produced from oxyamylose were studied chromatographically and spectrophotometrically and compared with those from D‐glucose. Three quinoxalines were identified with quinoxaline, 2‐methylquinoxaline and 2‐hydroxyethylquinoxaline. Mechanism of the reaction of oxyamylose with OPD is discussed.

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