Dextrinization purpose

The Fajans titration of Cl with Ag+ convincingly demonstrates indicator end points in precipitation titrations. Dissolve 0.5 g of NaCl plus 0.15 g of dextrin in 400 mL of water. The purpose of the dextrin is to retard coagulation of the AgCl precipitate. Add 1 mL of dichlorofluorescein indicator solution containing either 1 mg/mL of dichlorofluorescein in 95% aqueous ethanol or 1 mg/mL of the sodium salt in water. Titrate the NaCl solution... 

Analysis of commercial dextrins, with the view of determining their purity and their value for various industrial purposes, includes the following investigations ... 

Various substances, such as sodium carbonate (especially with eosin), magnesium sulphate, dextrin, starch, glucose or sugar may be added as thickening or to adjust the tint, and others, such as fatty substances, fatty acids, paraffin wax or ceresine (in colours for fats and waxes), to facilitate the use for particular purposes. 

Blyazid or Blyacid (Lead Azide). Replaced MF in detonators for military ammo and in commercial blasting caps. It is not used in Cu or brass primers or fuzes because of its tendency to form the highly sensitive Cu azide. For purposes where a higher sensitivity is desired, Pb Azide is covered with a layer of Pb Styphnate, or used with this more sensitive initiator. Pb Azide is used in both pure and dextrinated form... 

This chapter s purpose is to define these low profile markets where starches and dextrins are being used and to describe how the adhesive character of starch is developed in different ways for different end uses. 

We will discuss first whether there is an absolutely definite limit of action for all amylases. In the case of the action of /5-amylase on starch and on a-dextrins this question seems to be settled, but in the case of the malt a-amylase the answer is less certain. But certainly the action of the malt amylase practically stops at a certain limit. There is, however, almost always a very slow further action. It is possible that this slow saccharification of the limit dextrins is due not to the amylases but to other carbohydrases which have no action on starch but which are capable of attacking products with short chains. Under all circumstances it must be kept in mind that when in an experiment the saccharification for practical purposes has stopped and the limit dextrins have been isolated, this does not necessarily mean that the limit dextrins will not be further attacked by the enzyme used. But the velocity of this action is certainly very small compared with the velocity of the action on starch. Thus, it must be admitted that experiments involving the isolation of the limit dextrins after the action of a certain amylase on starch are in most cases not strictly reproducible. TJie total yield and chain length distribution of limit dextrins may vary, but their general character is not affected. If a limit dextrin produced by a certain amylase is treated with the same enzyme for a very long time, it is very often transformed to another limit dextrin of lower molecular weight with concomi-... 

With knowledge of the discussion about the site of the - biphasic - action (interfacial conversion versus reaction in the bulk of the liquid [130, 216]) the aqueous phase hydroformylation of higher ( heavier ) alkenes is still much investigated (e. g.. Refs. [216 b, 217 a, 218 g, 219 f, h, 231]). There is a certain trend to recommend high-molecular ligands for this purpose (e. g., calix[4]arenes, dextrins, etc.). Other papers describe the hydroformylation of special alkenes using Co or Ru catalysts [232]. 

On account of its high price, it is frequently adulterated, mostly with insoluble cherr> sulphurous acid to make it appear of better quality for certain purposes. This renders it unsuitable for the manufacture of matches. Since the conditions export from the Sudan have become unfavour-abk, gum arabic is adulterated with gum Senegal indeed, according to Liebermann, the latter is often sslightly acid, is heterogeneous. 

Colloidal Special purpose (RD1333) Dextrinated Barium azide Thallous azide... 

The only known in situ study [39] of material stored in bulk was conducted on Special Purpose lead azide (Chapter 1), as described in more detail in Section D.4, below. In addition, dextrinated lead azide that had been in storage for 25 years and had been repackaged was tested for suspected sensitivity changes. However, the sensitivity was found to be almost identical to that of a flesh preparation that was tested concurrently [38]. 

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