Maize degradation during processing

As mentioned above, the assumption that e.g. the highly bioactive 4-acetylbenzoxazolin-2(3/ 0-one (4-ABOA), isolated from kernels of a fusarium resistant maize line [96-98] may have resulted from the enzymatic and chemical degradation of the precursor 5-acetyl-4-hydroxy-2- 3-D-glucopyranosyloxy-2//-l,4-benzoxazin-3(4/f)-one is possible, particularly since no means to inactivate 3-glucosidase have been undertaken during the isolation process (Fig. (13)). 

The TGA purge gas mass/time i.e. temperature curves in the Figures 10.21 A and C confirm the loss of absorbed moisture between 30°C and 100°C (mass intensity maxima of m/z 17 and 18 during the first fifteen minutes). The Figures 10.21A and 10.2IB show at 200°C (35 minutes) a clear maximum for m/z = 17 i.e. a NH3 concentration maximum and at 230°C (40 minutes) a clear maximum for m/z = 44 i.e. a C02 concentration maximum. The MS results in the Figures 10.21B, 10.21C and 10.21D also show the release of C02, H20 and some CO during the main thermal degradation process (60 minutes/330°C) of this on maize based polymer sample. 

Maize juice produced from com starch, which has received considerable attention as a sucrose source, has been snccessfully deionized by conventional treatment with the result that improved sugar recoveries are possible. In the manufacture of dextrose, the organic acids and colored substances produced as degradation products during starch hydrolysis were eliminated economically by the use of the ion-exchange process to produce a high-quality sugar. 

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