Pregelatinized Maize Starch Research Articles

Un test d'irradiation de l'amidon. Mode operatoire, application à différents amidons

AbstractProof for Irradiation of Starch. Working Rules and Application to Various Starches. The test which is proposed for the proof of irradiation of starch is based on the determination of the malonaldehyde – which is formed by irradiation – by means of 2‐thiobarbituric acid. The study was made on the alteration of the aldehyde content of 3 starches (maize starch, pregelatinized maize starch, potato starch) which had been irradiated with 400 Krad and stored at different temperatures. If water content of the sample, storage temperature and duration of storage are known, the original irradiation dose can be calculated by the obtained graphs. These calculations are of variable precision in the specific cases. It is possible to determine the irradiation of maize starch having been stored for three months at 25 °C, provided that the irradiation dose had been of at least 25 Krad.

Water-Absorptive Properties of Selected Solids in a Lipophilic Base I

Water-absorptive properties of various combinations of starch, pregelatinized maize starch, talc, and zinc oxide dispersed in light liquid petrolatum were investigated. The suction orce and mercury rise were measured in terms of millibars with a tensiometer. The performance of these dispersions was evaluated in terms of two estimated parameters, α^ and β^, which were related to absorption rate and absorptive capacity, respectively. Water-absorptive capacity varied in a predictable way while absorption rate did not. Zinc oxide had the highest absorptive capacity. Some interaction among the powders was noted by a decrease in suction force when various ones were mixed together.