P-cellulose

Kiefer, J.E. and Touey, G.P. "Cellulose Acetate Spinning Solutions and Process of Spinning Fine Denier Filaments," US Patent 3,033,698(1962). 

P-cellulose Cellulose soluble in 17.5% basic solution but not soluble in 8% caustic solution. Boeseken-Haworth projections Planar hexagonal rings used for simplicity instead of staggered chain forms. 

CM cellulose (carboxymethyl) CM 22, 23 cellulose P cellulose (phosphate) SE cellulose (sulphoethyl) SM cellulose (sulphomethyl) DEAE cellulose (diethylaminoethyl) DE 22, 23 cellulose PAB cellulose (p-aminobenzyl) TEAE cellulose (triethylaminoethyl) ECTEOLA cellulose... 

According to a recent report (55), /3-lactamase I of strain 569 can be further resolved by P-cellulose chromatography. The three fractions thus obtained appear to retain their identity on gel electrophoresis, even in the presence of urea, and yield distinctive tryptic digest maps. 

Cellex P, cellulose sorbent with phosphonic acid groups... 

Cellulose is designated a, 3, and y on the basis of alkali solubility. a-Cellulose is that fraction not removed by treatment with 17.5% NaOH at 20°C the 17.5% NaOH-soluble fraction contains (3- and y-cellulose. The subfraction precipitating after acidification of the alkaline liquid phase is P-cellulose y-cellulose is the acid- and base-soluble subfraction remaining dispersed. a-Cellulose contains the highest DP. 

Tissue culture filter unit, 500 mL, 0.2-p cellulose acetate, sterile Nalgene... 

It should be noted, however, that mixture-based hbraries are not limited to the solution state, but have also been screened while bound to a sohd support, such as plastic pins,P cellulose membranes,or resin beads, This assay format is favorable for direct-binding assays involving soluble acceptors. 

O Brien, J.P. Cellulosic Fibers from Anisotropic Solutions. US Patent 4,464,323, 1984. 

Colloidal, aqueous dispersions of microcrystalline cellulose can be prepared by boiling cotton linters for 15 minutes with 2.5 N hydrochloric acid, followed by subjecting the resulting (level-off D.P.) cellulose to vigorous mechanical agitation. The microcrystals ( Avicel ), which are thereby freed from their fibrous packed structure, have been put to a variety of uses in the production of food gels and structural materials. ... 

Haskins, Joseph P., Cellulose Ethers of Industrial Significance, 2, 279-294... 

Fig. 7. Lineweaver-Burk plots for no inhibition, glucose and cellobiose inhibition in <25 p cellulose, enzyme activity —2.0FP, temp. 50 C...

These three isomers were separated on a column of P-cellulose, too. When 1-butanol saturated with water served as the solvent, 1-butanol cone. HCl water (200 15 15) eluted mer, s-fac and u-fac in this order. The resolutions of the u-fac and mer isomers were completely achieved on SE-Sephadex with 0.15 mol/dm sodium (-l-)-tartrato-antimonate(III), the (-I-) and (—) enantiomers being eluted in this order. Since the mer isomer racemizes quickly in neutral or alkaline solution, all the operations were performed in an aqueous solution acidified with 0.01 mol/dm HCl. 

For the determination of dissolved metals the sample needs to be filtered through a 0.45 p cellulose membrane filter as soon after collection as possible. An initial portion of the sample is used to rinse the filter apparatus and then discarded. After the sample has been filtered the filtrate must be acidified with high quality nitric acid to a pH of <2. Normally 3 mL/liter is sufficient to preserve the integrity of the sample. The metals of interest can be determined using the appropriate and/or available instrumentation. 

For the determination of suspended metals a representative volume of unpreserved sample must be filtered through a 0.45 p cellulose membrane filter. The filter containing the insoluble material is transferred to a beaker and cautiously digested with concentrated nitric acid until complete. The solution is evaporated to near dryness and either dilute hydrochloric acid or nitric acid is added depending on the instrumental technique used and/or the metal determined. The solution should be filtered and diluted to a specified volume. 

Mann G., Kunze J., Loth F., Fink H.-P., Cellulose ethers with a block-Uke distribution of substituents by structure-selective derivatization of cellulose. Polymer, 39,1998,3155-3165. 

Delmer D.P., Cellulose biosynthesis Exciting times for a difficult field of study, Annu. Rev. Plant Physiol. Plant Mol. Biol, 50,1999, 245. 

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