Cellulosic properties

Cellulosic properties
Summary: The cellulose does not significantly change while heating to about 150 Centigrade degrees, the coking because of dehydrating gradually that can exceed this temperature. Cellulose and denser mineral acid play a hydrolyzing role and turn into glucose,etc., act on to produce alkali cellulose with denser caustic alkali solution, turn into and oxidize the cellulose with strong oxidant function.
The base ring of the cellulosic macromolecule is D - glucose by - 1, macromolecule many candies that 4 candy glucoside keys make up, molecular weight about 50000- 2500000 is equivalent to 300- 15000 pieces of glucose base dehydration glucose, their molecular formulae are: ( C6H10O5) N, its chemistry makes up and includes carbon 44.44%, hydrogen 6.17%, oxygen 49.39%. Because of the difference of sources, the number of residue of glucose in the cellulosic molecule, namely get degree (DP) together In very wide range. The molecular formula can write ( C6H10O5) n. It is principal ingredients of vascular bundle plant, lichen plant and some alga cell walls. Acetic acid fungus (Acetobaeter) Pod membrane,and tail asking for animal find too by existence with cellulose in the pocket, cotton seed mao are high purity (98% cellulose. As it always goes, - cellulose ' - cellulose) This name is a part that can't be drawn from the totally cellulosic standard sample of the original cell wall by 17.5% NaOH. - cellulose ( - cellulose) , - cellulose ( - cellulose) Correspondent to the half cellulosic cellulose.
Though, usually the majority is the crystallization cellulose, - cellulose on - cellulose, - cellulose also contains various more than carbohydrate besides containing the cellulose chemically. The cellulose of the cell wall forms the little fiber. The width is 10- 30 millimicrons, some of length is up to several microns. Employ the diffraction of X-ray and shoulder the decoration method (negative decoration method) ,Observe according to electron microscope, catenate the intersection of molecule and parallel crystallization that arrange part make up wide as millimicron of basic little fibers. Infer these basic little fibers form the little fiber when being assembled. The cellulose can be soluble in Schwitzer reagent or dense sulfuric acid. Though is difficult to hydrolyze with the acid, rare acid or cellulase can make the cellulose produce D - glucose, fibrous biose and liogosaccharide.
Have in the acetic acid fungus from UDP glucose guiding drug (primer) Shift glucoside of candy and formate cellulosic enzyme (cellulose synthase (UDPformingEC2. 4. 1. 12). Have already got the standard sample with likewise active particle enzyme in the higher plant. This enzyme is usually to utilize GDP glucose (cellulose synthase (GDP forming) EC2. 4. 1. 29),On condition that shift by UDP glucose, - 1 happens, the mixing of 3 keys. The a little fibrous forming place and mechanism too bright of controlling the cellulose to arrange. On the other hand in terms of cellulosic resolving, while estimating and coming into being the cell wall to spread and grow, a portion of the little fiber is decomposed, become solubility because of function of cellulase.
Organic solvents such as the cellulose is insoluble in water and ethanol, ether,etc., can be soluble in copper ammonia Cu(NH3) 4( OH) 2 solution and copper second and two amine [NH2CH2CH2NH2]Cu( OH) 2 solution,etc.. Water can make the cellulose dissolve limitedly bloatedly, aqueous solution of some acid, alkali and salt can be permeated through the crystalline district of fiber, produce and dissolve limitlessly bloatedly, make the cellulose dissolve. The cellulose does not significantly change while heating to about 150 Centigrade degrees, the coking because of dehydrating gradually that can exceed this temperature. Cellulose and denser mineral acid play a hydrolyzing role and turn into glucose,etc., act on to produce alkali cellulose with denser caustic alkali solution, turn into and oxidize the cellulose with strong oxidant function.
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