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Product solution concentration control testing

Surfactants are frequently used in detergents and food products to alter the properties of solution interfaces, mediating between immiscible phases because of their hydrophobic and hydrophilic moieties. The addition of surfactants increases the concentration of hydrophobic compounds in the water phase by solubilization or emulsification above a specific threshold, the critical micellar concentration (CMC), where surfactant molecules aggregate to micelles [130]. Two widely utilized nonionic surfactants, Tween 80 and Triton X-100, were evaluated in terms of enzyme interaction, by calculating the inactivation coefficient (kA) under static conditions. Concentrations lower than CMC were studied in order to avoid diffusional limitations in the interaction of the enzyme and the PAH in the micellar phase. The concentration 0.25 CMC was considered the most favorable for the enzyme, with Triton X-100 being the surfactant that led to the lowest inactivation coefficients for all the concentrations tested and was 2.5 times lower than kd in control experiment. [Pg.281]

For rapid analysis during the production process atomic absorption is mainly of indirect value because, due to the sequential character of the technique, it cannot be used for complete steel or slag analysis in a two to three minute period. The analytical requirements for the testing of rapid continuous production processes are fulfilled by the techniques of emission and X-ray spectrometry. These techniques are characterised by great speed, high precision and simultaneous multi-element analysis. Accuracy must, however, be constantly checked with a variety of special calibration samples. This requires the determination of the true concentrations of the calibration samples with chemical methods of solution analysis, whose precision is often only equal to or, when compared with X-ray spectrometry, frequently poorer. Chemical analysis is, however, the basis of all comparisons, and must be repeated frequently for the determination of the true concentrations. Atomic absorption, with its relatively good precision, has greatly simplified the analytical control of numerous elements. [Pg.212]

Measure oxygen consumption during controlled lipid oxidation induced by thermal decomposition of 2,2 Azobis(2-aminopropane) hydrochloride AAPH Based on inhibition of production of 2,2 Azinobis(3-ethylbenzthiazoline)-6-sulfonic acid ABTS radical cation and mM concentration of a Trolox solution having antioxidant capacity equivalent to 1.0-mM solution of test substance... [Pg.488]


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See also in sourсe #XX -- [ Pg.410 ]




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Concentrated solutions

Concentrates products

Concentrating solutions

Control Product concentration

Control testing

Control tests

Product control

Product controlling

Product solution

Product solution concentration

Product testing

Product tests

Production controls

Production solution

Production test

Production testing

Solute concentration

Solutions solution concentrations

Test solutions

Tested products

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