Pigment bleaching

Arheopectic pigmented bleach (alkali metal hypochlorite) hard surface cleaner formulated with bentonite clay is disclosed in U.S. Patent 5,688,435. Examples of time-dependent shear effects determined from constant shear rate measurements at 1, 10, 50, and 100 sec-1 are provided in the patent and shown in Figure 4.2 and Figure 4.3. The viscosity data show evidence of shear thickening as a function of time at constant shear rates of 1 and 10 sec-1 and thixotropy occurs at 50 and 100 sec-1. The formulation is rheopectic at 10 sec-1. Dynamic mechanical data are also contained in the patent and the storage and loss modulus as a function of strain amplitude is shown in Figure 4.4, for one patent example. 

Prote-SoL [Synthron] Wetdng agent, dispersant stabilizer for dyeing, pigments, bleaching. 

The presence of a lipid-oxidizing enzyme in plants, then termed lipoxidase, was first described by Andre and Hou in 1932 [1]. A pigment bleaching property, attributed to a separate enzyme activity described as carotene oxidase, was later found to originate from this enzyme as well [2]. The name lipoxygenase (linoleateioxygen oxidoreductase, EC 1.13.11.12) is now used for this enzyme. 

We have seen that the rods and cones contain the visual pigment and that the pigment bleaches when exposed to light. The retina of the intact animal recovers its bright color when placed in the dark. Such... 

PIGMENT BLEACHING IN RELATION TO PS-I and PS-II ACTIVITY OF SUBCHLORO-PLAST PARTICLES PREPARED WITH DIGITONIN. 

Experiments were repeated three times and gave similar results with respect to the overall behaviour of pigment bleaching and the loss of photosynthetic activities in the different illuminated samples. However, single values after certain illumination times can vary up to 20% depending on the quality of the starting material. 

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