Flow injection kinetic spectrophotometric determination of ascorbic acid based on an inhibiting effect
✍ Scribed by Jing Fan; Cunling Ye; Suling Feng; Guien Zhang; Jianji Wang
- Book ID
- 117225054
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 91 KB
- Volume
- 50
- Category
- Article
- ISSN
- 0039-9140
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A method is proposed for the flow-injection determination of ascorbic acid (0.1-40 pg ml-'). Iodine is generated in the flow system as triiodide ion or the triiodide/starch complex giving a steady spectrophotometric signal at 350 or 580 nm, respectively; inverse peaks caused by ascorbic acid samples
The chemiluminescent reaction, in alkaline solution, of lucigenin with the products from the photooxidation of ascorbic acid sensitized by toluidine blue has been studied. A flow-injection configuration is proposed for the determination of ascorbic acid over a concentration range of 1 X 10p9-3 X lop
The flow-injection spectrophotometric determination of different amino acids was carried out by reaction with copper(B) ions entrapped in a polymeric material and filling a packed-bed reactor; the released copperW, complexed with the amino acid, reacted with zincon in a basic medium producing a blue