The present invention relates to a polysaccharide derivative which is able to not only enhance cleaning properties of clothing, etc. but also suppress resoiling due to powder soil during washing. The polysaccharide derivative is a polysaccharide derivative having a cationic group and a hydrocarbon group (R) having 2 or more carbon atoms, wherein the hydrocarbon group (R) is bound to a group resulting from eliminating a hydrogen atom from a hydroxy group of a hydroxyalkylated polysaccharide, directly or via a hydrocarbon group having an oxygen atom; the hydroxyalkylated polysaccharide is a hydroxyethylated polysaccharide or a hydroxypropylated polysaccharide; and the hydroxyalkylated polysaccharide has a weight average molecular weight of 10,000 or more and 740,000 or less.

Friction reducers, fracturing fluid compositions and methods for treating subterranean formations, wherein friction reducer is a reacted, grafted or blend of natural gum and polyacrylamide having a molecular weight between 300,000 and 30,000,000.

The present disclosure provides a composition for submucosal injection including a divalent cation and an oligosaccharide obtained by exposing powdered polysaccharides to irradiation, heat, ultrasound, or ultraviolet radiation. The composition may be provided as a single solution; or the divalent cation and the oligosaccharide may be separately packaged, with the divalent cation being provided in solution form and the oligosaccharide being provided in powder form. The divalent cation may be 0.1-0.5% w/v of Ca.sup.2+, Mg.sup.2+, Fe.sup.2+, Cu.sup.2+, Ba.sup.2+, Zn.sup.2+, or any combination thereof. The oligosaccharide may be 0.5-2% w/v of degraded sodium alginate, degraded xanthan gum, degraded dextran, degraded welan gum, degraded gellan gum, degraded diutan gum, or any combination thereof. When the divalent cation is in contact with the oligosaccharide, viscosity of the composition is greater than 1000 cP, and injection pressure of the composition falls within a range of 2.5-4 kgf.

Disclosed are compounds, in particular based on polysaccharides, that are adsorbed on a cellulosic material, and relates in particular to the application of such compounds as reinforcing agent for cellulosic materials, in the wet and/or dry state. The compounds include a combination of at least one polysaccharide adsorbed on a cellulosic material, the polysaccharide including at least two different monosaccharide units, forming first and second monosaccharide units, the second monosaccharide units being branched on a chain including at least the first monosaccharide units, at least some of the second monosaccharide units being non-cyclic and bearing aldehyde functions, the aldehyde functions possibly forming hemiacetal functions with hydroxy functions of the cellulosic material.

The present invention relates to a non-cellulosic polysaccharide derivative: i) having a mean average molecular weight (Mw) from about 100,000 g/mol, preferably from about 150,000 g/mol and more preferably from about 200,000 g/mole to about 2,000,000 g/mol, preferably to about 1,800,000 g/mol and more preferably to about 1,400,000 g/mole; and ii) containing at least one cationic group, with a cationic degree of substitution (DS.sub.cat).sub.extraction, from about 0.20 to about 0.30.

The present invention relates to a non-cellulosic polysaccharide derivative: i) having a mean average molecular weight (Mw) from about 100,000 g/mol, preferably from about 150,000 g/mol and more preferably from about 200,000 g/mole to about 2,000,000 g/mol, preferably to about 1,800,000 g/mol and more preferably to about 1,400,000 g/mole; and ii) containing at least one cationic group, with a cationic degree of substitution (DS.sub.cat.).sub.extraction, from about 0.20 to about 0.30.

Therapeutic compositions and/or formulations are provided, comprising: at least one cross-linked protein matrix, wherein the at least one cross-linked protein matrix comprises at least one protein residue and at least one saccharide-containing residue, and methods of producing the same. The cross-linked protein matrix may be derived from cross-linking a full length or substantially full length protein, such as tropoelastin, elastin, albumin, collagen, collagen monomers, immunoglobulins, insulin, and/or derivatives or combinations thereof, with a saccharide containing cross-linking agent, such as a polysaccharide cross-linking agent derived from, for example, hyaluronic acid or a cellulose derivative. The therapeutic compositions may be administered topically or by injection. The present disclosure also provides methods, systems, and/or kits for the preparation and/or formulation of the compositions disclosed herein.

A method of treating a subterranean formation penetrated by a wellbore, wherein the subterranean formation comprises one or more permeable zones, comprising introducing a superabsorbent polymer (SAP) fluid into the wellbore, wherein the SAP fluid comprises an aqueous fluid and an SAP material comprising a reaction product of a reaction mixture comprising one or more viscosifying polymeric materials, one or more crosslinking agents, and water, allowing the SAP fluid to flow into at least a portion of the one or more permeable zones in the subterranean formation, and allowing the SAP material to absorb water and form a swollen SAP material, wherein the swollen SAP material impedes fluid flow through at least a portion of the one or more permeable zones.

The invention provides an improved method of synthesising derivatives of β-D-glucopyranoside-containing polymers, such as chitin, chitosan, cellulose, amylose, pullulan, curdlan, inulin, guar gum or cyclodextrin. The method includes reacting a polymer of formula (III) with a cyclic imide to form a polymer of formula (I) thereby introducing a nitrogen functionality at the 6-position and providing access to 6-deoxy-6-amino-β-D-glucopyranoside-containing polymers. ##STR00001##

A method of making a proppant-gel matrix comprising: a) hydrating a gelling agent to form a hydrated gelling agent; b) adding a basic compound to the hydrated gelling agent to form a basic hydrated gelling agent having a pH in the range of 11.5 to 14.0; c) mixing the basic hydrated gelling agent and a proppant to form a basic hydrated gelling system; and d) adding a crosslinking agent to the basic hydrated gelling system to form the proppant-gel matrix, is disclosed. The proppant-gel matrix can then be used as a fracturing fluid in a hydraulic fracturing process.