WO2002103038A1 - Un procedimiento enzimático para obtener 4-0-b-d galactopiranosil-d-xilosa obtenida deacuerdo con el procedimiento, composiciones que la contienen y su uso en la evaluación de la lactasa intestinal - Google Patents
Un procedimiento enzimático para obtener 4-0-b-d galactopiranosil-d-xilosa obtenida deacuerdo con el procedimiento, composiciones que la contienen y su uso en la evaluación de la lactasa intestinal Download PDFInfo
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- WO2002103038A1 WO2002103038A1 PCT/ES2002/000297 ES0200297W WO02103038A1 WO 2002103038 A1 WO2002103038 A1 WO 2002103038A1 ES 0200297 W ES0200297 W ES 0200297W WO 02103038 A1 WO02103038 A1 WO 02103038A1
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- xylose
- reaction
- galactopyranosyl
- reaction mixture
- mixture
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/12—Disaccharides
Definitions
- the present invention is comprised in the field of procedures for. obtain compounds, specifically disaccharides useful in the methods of evaluation of blood lactase activity.
- intestinal lactase activity is of importance in pediatrics and gastroenterology and can be carried out directly, from a sample of mucosa, or indirectly, from the level of blood glucose or exhaled hydrogen, after administration of One dose of lactase to the individual.
- Direct determination has the disadvantage of being a complex and expensive method. because it requires specific instruments and highly specialized personnel to practice the extraction of the sample, which must be subsequently analyzed, apart from being unpleasant and not without danger for the individual
- intestinal lactase Other methods of determining intestinal lactase are based on the fact that certain disaccharides are, based on their affinity for lactase, capable of acting as a lactase substrate and are transformed, by the enzyme, into certain monosaccharides that are easily absorbed by the intestine and eliminated by the urine.
- Said disaccharide is administered orally, acts as a substrate for intestinal lactase and therefore decomposes, in the intestinal tract, in xylose and galactose, the xylose being absorbed and eliminated in the urine in which the xylose can be directly evaluated by a colorimetric method simple.
- the amounts of xylose excreted in urine are correlated with intestinal lactase levels.
- Spanish patent ES-P-9001680 also describes a preparation method basically for 4-O- ⁇ - galactopyranosyl-D-xylose, comprising a synthesis from benzyl ⁇ -D-xylopyranoside and following a sequence of operations involving reactions of selective protection, glycosylation and deprotection.
- Both the number of reaction stages, and the use of expensive reagents such as silver triflate in the glycosylation reaction, and the use of chromatography columns in the purification of intermediates and the final product, produce costs and present difficulties in carrying carry out this procedure on an industrial scale.
- the 4-0- ⁇ -D-galactopyranosyl-D-xylose that can be obtained by the aforementioned process as well as the compositions comprising said 4-0- ⁇ -D-galactopyranosyl-D-xylose, constitute further objects of the invention.
- a reaction medium comprising buffered water at a pH between 5.0 and 9. 0; 10 to 1,000 units of a ⁇ -D-galactosidase enzyme are added, per gram of ⁇ -D-galactopyranoside to the first reaction mixture; and obtaining a second reaction mixture; a second stage in which the second reaction mixture is subjected to a reaction at a temperature between a temperature higher than the freezing point of the second reaction mixture and 452C, for 2 to 48 hours, to form disaccharides in the second mixture of reaction; a third stage in which the reaction is stopped when the disaccharides have been formed in the desired amount, by a treatment chosen from a deactivation of the ⁇ -D-galactosidase by freezing the second reaction mixture at a temperature between -209C and -1702C, a deactivation of ⁇ -D-galactosidase by
- the proportion of D-xylose in the second reaction mixture is preferably 7.5% by weight
- the proportion of ⁇ -D-galactopyranoside in the second reaction mixture is 1.5% by weight.
- 100 units of ⁇ -D-galactosidase are added, per gram of ⁇ -D-galactopyranoside.
- the reaction medium may further comprise at least one cosolvent medium selected from dimethylsulfoxide, dimethylformamide, dioxane and mixtures thereof, preferably in a proportion of 20% based on the reaction medium.
- the reaction medium is buffered at pH 7.
- the reaction is conveniently carried out at a constant temperature, in order to increase its reproducibility.
- the reaction temperature is greater than the freezing point of the second reaction mixture and less than 40 seconds.
- the reaction is carried out at room temperature, which allows good yields without the need to cool the second reaction mixture.
- the reaction can also be performed at -52C, or at 372C.
- the reaction temperature is preferably lower than O ⁇ C but higher than the freezing point of the second reaction mixture.
- the ⁇ -D-galactopyranoside substrate is preferably selected from o-nitrophenyl ⁇ -D-galactopyranoside (Gal-ONP) and lactose.
- the enzyme ⁇ -galactosidase can be ⁇ -galactosidase from E. coli or from Kluyveramyces lactis (such as AXILACT®).
- Gal-ONP When Gal-ONP is used as a substrate, it is formed in the o-nitrophenol reaction that is removed by extraction with ethyl acetate in the event that the reaction is stopped by heating, or it is eliminated by simple filtration in case the reaction is stopped by cooling.
- a temperature of -782C is preferably applied.
- a temperature of 100se is preferably applied.
- 4-0- ⁇ -D-galactopyranosyl-D-xylose can be isolated from the reaction mixture, by several alternative methods.
- water is removed from the fourth reaction mixture to obtain a reaction residue containing the disaccharides, the reaction residue is subjected to an acetylation treatment to obtain a 4-0- ⁇ -peracetylated derivative.
- the acetylation of the reaction residue is preferably carried out with acetic anhydride in pyridine, while, preferably, the deacetylation of the peracetylated derivative is carried out catalytically with sodium methoxide in methane1.
- the fourth reaction mixture is subjected to a column elution with a first eluent which can be selected from mixtures of water with methanol, ethanol or isopropanol, preferably a water / isopropanol mixture with an isopropanol ratio of 1 to 10% (v / v), preferably 2% (v / v).
- a first eluent which can be selected from mixtures of water with methanol, ethanol or isopropanol, preferably a water / isopropanol mixture with an isopropanol ratio of 1 to 10% (v / v), preferably 2% (v / v).
- Elution is carried out in a filtration column selected from filtration columns with cross-linked dextran polymer fillers, such as a SEPHADEX filled column, columns filtration with fillers of acrylamide polymers, such as a column with BIOGEL filler, and filtration columns of activated carbon or activated carbon-celite, to obtain fractions containing 4- O- ⁇ -D-galactopyranosyl-D- Xylose
- the fourth reaction mixture is concentrated before undergoing elution in the column.
- celite is added to the fourth reaction mixture, the mixture thus obtained is concentrated to dryness and the residue is subjected to a solid-liquid extraction with an organic solvent in a soxhlet extractor followed by elution in a column .
- the preferred solvent for solid-liquid extraction is ethyl acetate.
- the column is selected from filtration columns with crosslinked dextran polymer fillers, such as a column with SEPHADEX filler, filtration columns with acrylamide polymer fillers, such as a BIOGEL filled column, and filtration columns. of active carbon or activated carbon-celite.
- the column is activated carbon-celite, in which the carbon is deactivated by the addition of hydrochloric acid.
- This third alternative method offers the advantage of removing most of the xylose - especially when used in excess in the reaction - before elution in the column whereupon the filling, as well as the amount of first eluent that is Need for elution is much less.
- Another advantage of this third alternative method is that the solid-liquid extraction in ethyl acetate is completely selective since in the liquid phase there is no presence of disaccharides, but only of xylose and galactose.
- elution in the fifth stage is performed instead of using a filler column, adding active carbon to the fourth reaction mixture once separated the agliconic fragment of the substrate in the fourth stage, thus obtaining that the 4-0- ⁇ -D-galact ⁇ piranosyl-D-xylose, is adsorbed on the active carbon and eluting the 4-0- ⁇ -D - galactopyranosyl-D-xylose of activated carbon with a second eluent.
- Said elution is preferably carried out by consecutive washing with water and with diluted isopropanol with increasing proportion by volume of isopropanol in successive steps.
- the volume ratio of isopropanol is between 1% and 3% in a first step, between 3% and 5% in a second step, and between 5% and 7% in a third step.
- the preferred isopropanol concentration for washing is a 2% isopropanol sequence, followed by elution with 4% isopropanol and followed by elution with 6% isopropanol. From the residue obtained by concentration, pure 4-0- ⁇ -D-galactopyranosyl-D-xylose is obtained by crystallizing it in acetone-water.
- o-nitrophenyl ⁇ -D-galactopyranoside is used as the substrate for the reaction.
- the invention also relates to 4-0- ⁇ -D-galactopyranosyl-D-xylose obtained by the above-described process, and to salt or aqueous compositions and solutions, comprising a 4-0- ⁇ -
- D-galactopyranosyl-D-xylose obtained by said procedure, as well as the use of a 4-0- ⁇ -D-galactopyranosyl-D-xylose in the preparation of compositions and solutions for the in vivo evaluation of intestinal lactase in humans.
- ⁇ -D-galactopyranosyl-D-xylose is combined with pharmaceutically acceptable amounts of at least one additive selected from stabilizers, protectants, flavorings, lactose, gelling agents, fluidizing agents and preservatives, pharmaceutically acceptable and conventional.
- 4-0- ⁇ -D-galactopyranosyl-D-xylose or the compositions or solutions that contain it, are administered orally and lead to the appearance in urine of xylose which, spectrophotometrically evaluated-, is used in a specific, routine way , bloodless and simple for the diagnostic evaluation of deficiencies in lactase activity.
- Example 1 To determine the influence of the reaction temperature the following test was performed: Samples of reaction mixtures were prepared composed of
- reaction medium comprised of an aqueous solution buffered to pH 7
- Example 2 To determine the influence of pH on the reaction, the following samples were prepared:
- D-xylose 500mM: 125mg E. coli galactosidase: 1.6 u Buffered aqueous solution (50mM potassium phosphate, lmM MgCl 2 / 5mM mercaptoethanol) at pH: 8.5 l, 6ml
- Example 3 To synthesize 4-0- ⁇ -D-galactopyranosyl-D - xylose were dissolved 6g nitrophenyl ⁇ -o-xylose D in 330ml of water buffered to pH 7 (-D- galactopyranoside (Gal-ONP) and 25 g of 0.05M KH 2 PO 4/2 2 HPO 4, LMM MgCl 2, 5mM mercaptoethanol), were added 2 mg (640U) of ⁇ - galactosidase enzyme from E. coli, and the solution thus obtained was subjected to incubation at 30s C an orbitical agitator until the Gal-ONP was practically consumed (approximately 4 hours).
- reaction was stopped by heating in a water bath at 100SC for 10 minutes, and then the o-nitrophenol formed with CH 2 C1 2 was extracted -
- the precipitated salts were filtered, the filtrate was concentrated to dryness and the residue was chromatographed on a silica gel column using a gradient of hexane / ethyl acetate of 4: 1 - 1: 1 as eluent. From the column, the acetylated D-xylose was eluted first and then the mixture of the acetylated disaccharides. Once the fractions containing the disaccharide mixture were concentrated, the residue was dissolved in MeOH, a solution of 1M MeONa / MeOH was added, and the mixture thus obtained was stirred until deacetylation was complete (tic follow-up with isopropanol / NH 3 / H 0).
- the mixture was neutralized with AMBERLITE IR-120 (H + ) and concentrated to dryness.
- the mixture of free disaccharides was crystallized twice successively with MeOH / acetone, obtaining 1.07 of 4-0- ⁇ -D-galactopyranosyl-D-xylose with a 17% yield based on the initial Gal-ONP.
- Example 4 An active / celite column was prepared by dry mixing 200g of activated carbon (DARCO G-60) and 200 g of celite, and water was added until a homogeneous paste formed. The paste was treated with 150ml of HCl (35%) to deactivate the coal, as well as to wash traces of iron and alkaline ashes, and then washed with water until the wash waters came out neutral. Once washed, it was packed in a 5cm (a) x 50cm chromatography column, and compacted.
- DARCO G-60 activated carbon
- Example 3 Following the methodology set forth in Example 3, the reaction was stopped by heating at 100se for 10 minutes and the ortonitrophenol formed with ethyl acetate was extracted. The aqueous solution was concentrated to an approximate volume of 50ml, filtered through glass wool and passed through the active / celite carbon column. First, excess D-xylose was eluted with water and then, using a fractionated gradient of EtOH / H 2 0 (2% -10% EtOH), the disaccharide mixture was collected.
- EtOH / H 2 0 2% -10% EtOH
- the enriched fractions in the 4-0- ⁇ -D-galactopyranosyl-D-xylose regioisomer were pooled and concentrated to a reduced volume, after which acetone was added until the appearance of turbidity leaving the mixture obtained in the cold to stand.
- the 4-0- ⁇ -D-galactopyranosyl-D-xylose crystallized purely, obtaining 970mg, that is, 19% based on the initial Gal-ONP, whose spectral data coincided with those exposed with respect to the product obtained according with example 3.
- Example 5 A column of activated carbon / celite was prepared by dry mixing 200g of activated carbon (DARCO G-60) and 200 g of celite, and water was added until a homogeneous paste was formed. The paste was treated with 150 ml of HCl (35%) to deactivate the carbon and wash the residues of iron and 'alkaline ashes and subsequently washed with water until the wash waters came out neutral. Once washed, it was packed in a 5cm ( ⁇ ) x 50cm chromatography column, and compacted.
- Example 3 Following the methodology set forth in Example 3, the reaction was stopped by heating at 1002C for 10 minutes and the ortonitrophenol formed with ethyl acetate was extracted. The aqueous solution was concentrated to a volume of approximately 50ml, filtered through glass wool and passed through the active carbon / celite column.
- Supernatant produced contained only a minimal amount of 4-0- ⁇ -D-galactopyranosyl-D-xylose.
- the 4- O- ⁇ -D-galactopyranosyl-D-xylose crystals were filtered and washed with acetone.
- Example 6 An • activated carbon / celite column was prepared by dry mixing 200g of activated carbon (DARCO G-60) and 200 g of celite, and water was added until a homogeneous paste was formed. The paste was treated with 15Oral HCl (35%) to deactivate the carbon and wash traces of iron and alkaline ashes, and then washed with water until the wash waters came out neutral. Once washed, it was packed in a 5cm (0) x 50cm chromatography column, and compacted.
- DARCO G-60 activated carbon
- Example 4 Following the methodology set forth in Example 4, the reaction was stopped by heating at 1009C for 10 minutes and the ortonitrophenol formed with ethyl acetate was extracted and filtered to remove traces of the enzyme. The aqueous solution was concentrated in vacuo to an approximate volume of 45 ml, and passed through an active carbon / celite column. First, the excess D-xylose was eluted with water and then, using a fractionated gradient of EtOH / H 2 0 (2% 10% EtOH) the disaccharide mixture was collected.
- the enriched fractions in the 4-0- ⁇ -D-galactopyranosyl-D-xylose regioisomer were pooled and concentrated to a reduced volume, after which acetone was added until the appearance of turbidity was allowed to stand the mixture thus obtained cold.
- the crystallized 4-0- ⁇ -D-galactopyranosyl-D-xylose was filtered through a filter plate, obtaining 817mg, that is, 16% based on the initial Gal-ONP.
- Example 7 A column of activated carbon / celite was prepared by dry mixing 200g of activated carbon (DARCO G-60) and 200 g of celite, and water was added until a homogeneous paste was formed. The paste was treated with 150ml of HCl (35%) to deactivate the carbon and wash traces of iron and alkaline ashes, and then washed with water until the wash waters came out neutral. Once washed, it was packed in a 5cm (0) x 50cm chromatography column, and compacted.
- DARCO G-60 activated carbon
- HCl 150ml of HCl
- Rf (4-0- ⁇ -D-galactopyranosyl-D-xylose): 0.17 Rf (2-0- ⁇ -D-galactopyranosyl-D-xylose
- Example 3 Following the methodology set forth in Example 3, the reaction was stopped by heating at 1002C for 10 minutes and the ortonitrophenol formed with ethyl acetate was extracted and filtered to remove traces of the enzyme.
- the aqueous solution was concentrated in vacuo to an approximate volume of 70 ml, and the concentrated solution was eluted through an active carbon / celite column. First, it was eluted with 2% isopropanol / water and 1.3 liters were collected. Then 4% fractions were collected up to 2.6 liters, using a total volume of 3.9 liters.
- the enriched fractions in the 4-0 ⁇ ⁇ -D-galactopyranosyl-D-xylose regioisomer were pooled and concentrated to a reduced volume, after which acetone was added until the appearance of turbidity allowing the mixture thus obtained to stand cold.
- the crystallized 4-0- ⁇ -D-galacto ' pyranosyl-D-xylose was filtered through a filter plate, yielding 1,213mg, that is, 24% based on the initial Gal-ONP.
- Example 8 An active carbon / celite column was prepared by dry mixing 24g of activated carbon (DARCO G-60) and 24 g of celite, and water was added until a homogeneous paste formed. The paste was treated with 18ml of HCl (35%) to deactivate the carbon as well as wash iron debris and alkaline ashes, and then washed with water until the wash waters came out neutral. Once washed, it was packed in a chromatography column and compacted.
- DARCO G-60 activated carbon
- HCl 18ml of HCl
- reaction was followed by thin layer chromatography with isopropanol / NH 3 / H 2 0 (7.5 / 0.5 / 2.5) in a manner analogous to that indicated in example 7.
- the reaction was stopped by heating at 1002C for 10 minutes, allowed to cool and the ortonitrophenol formed with ethyl acetate was extracted.
- celite 40g
- the mixture was concentrated to dryness.
- the solid residue was subjected to a solid-liquid extraction using a "soxhlet" extractor equipped with a cellulose cartridge and using ethyl acetate (500ml) as the solvent.
- Example 9 To synthesize 4-0- ⁇ -D-galactopyranosyl-D-xylose, 4.12g of o-nitrophenol ⁇ -D-galactopyranoside (Gal-ONP) and 20.6 g of D-xylose were dissolved in 272ml of water buffered to pH 7 (0.05M KH 2 P0 / K2 2 HP0, lmM MgCl 2 , 5mM mercaptoethanol), 66 units of E. coli ⁇ -galactosidase enzyme were added, and the solution thus obtained was incubated at 37 SC in an orbitical agitator until the Gal-ONP was practically consumed (21 hours).
- Gal-ONP o-nitrophenol ⁇ -D-galactopyranoside
- the reaction was stopped by cooling to 02c and the o-nitrophenol was filtered as a solid.
- the mixture was filtered and the active carbon solid was washed with water (400 ml), 2% isopropanol (100 ml), 4% isopropanol (200 ml) and 6% isopropanol (200 ml).
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Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003505359A JP4115933B2 (ja) | 2001-06-18 | 2002-06-14 | 4−O−β−D−ガラクトピラノシル−D−キシロースの酵素的製造方法、該方法によって得られる4−O−β−D−ガラクトピラノシル−D−キシロース、該キシロースを含有する組成物および腸ラクターゼの評価における該キシロースの使用 |
DE60210278T DE60210278T2 (de) | 2001-06-18 | 2002-06-14 | ENZYMATISCHES VERFAHREN ZUR HERSTELLUNG VON 4-O-ß-D-GALACTOPYRANOSYL-D-XYLOSE, MIT DIESEM VERFAHREN GEWONNENE 4-O-ß-D-GALACTOPYRANOSYL-D-XYLOSE, DIESE ENTHALTENDE ZUSAMMENSETZUNGEN UND VERWENDUNG DAVON BEIM QUANTIFIIZIEREN INTESTINALER LACTASE |
ES02740774T ES2260444T3 (es) | 2001-06-18 | 2002-06-14 | Un procedimiento enzimatico para obtener 4-0-b-d-galactopiranosil-d-xilosa,4-o-b-d-galactopiranosil-d-xilosa obtenida de acuerdo con el procedimiento, composiciones que la continenen y su uso en la evaluacion de la lactasa intestinal. |
AU2002314215A AU2002314215B2 (en) | 2001-06-18 | 2002-06-14 | Enzymatic method of producing 4-0-beta-D galactopyranosyl-D-xylose, 4-0-beta-D-galactopyranosyl-D-xylose obtained using said method, compositions containing same and the use thereof in evaluating intestinal lactase |
CA2451065A CA2451065C (en) | 2001-06-18 | 2002-06-14 | Enzymatic method of producing 4-0-beta-d-galactopyranosyl-d-xylose |
MXPA03011869A MXPA03011869A (es) | 2001-06-18 | 2002-06-14 | Un procedimiento enzimatico para obtener 4-o-??-d-galactopiranosil-d-xilosa, 4-o-??-d-galactopiranosil-d-xilosa obtenida de acuerdo con el procedimiento, composiciones que la contienen y su uso en la evaluacion de la lactasa intestinal. |
EP02740774A EP1408118B1 (en) | 2001-06-18 | 2002-06-14 | Enzymatic method of producing 4-0-b-d galactopyranosyl-d-xylose, 4-0-b-d-galactopyranosyl-d-xylose obtained using said method, compositions containing same and the use thereof in evaluating intestinal lactase |
US10/738,378 US7537909B2 (en) | 2001-06-18 | 2003-12-17 | Enzymatic method of producing 4-O-β-D-galactopyranosyl-D-xylose, 4-O-β-D-galactopyranosyl-D-xylose obtained using said method, compositions contain same and the use thereof in evaluating intestinal lactase |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES200101419A ES2182703B1 (es) | 2001-06-18 | 2001-06-18 | Un procedimiento enzimatico para obtener 4-0-b-d-galactopiranosil-d-xilosa, 4-o-b-d-galactopiranosil-d-xilosa obtenida de acuerdo con el pr cedimiento, composiciones que la contienen y su uso en la evaluacion de la lactasa intestinal. |
ESP200101419 | 2001-06-18 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/738,378 Continuation US7537909B2 (en) | 2001-06-18 | 2003-12-17 | Enzymatic method of producing 4-O-β-D-galactopyranosyl-D-xylose, 4-O-β-D-galactopyranosyl-D-xylose obtained using said method, compositions contain same and the use thereof in evaluating intestinal lactase |
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WO2002103038A1 true WO2002103038A1 (es) | 2002-12-27 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/ES2002/000297 WO2002103038A1 (es) | 2001-06-18 | 2002-06-14 | Un procedimiento enzimático para obtener 4-0-b-d galactopiranosil-d-xilosa obtenida deacuerdo con el procedimiento, composiciones que la contienen y su uso en la evaluación de la lactasa intestinal |
Country Status (12)
Country | Link |
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US (1) | US7537909B2 (es) |
EP (1) | EP1408118B1 (es) |
JP (1) | JP4115933B2 (es) |
AT (1) | ATE321876T1 (es) |
AU (1) | AU2002314215B2 (es) |
CA (1) | CA2451065C (es) |
DE (1) | DE60210278T2 (es) |
ES (2) | ES2182703B1 (es) |
MX (1) | MXPA03011869A (es) |
PT (1) | PT1408118E (es) |
RU (1) | RU2316593C2 (es) |
WO (1) | WO2002103038A1 (es) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9128100B2 (en) | 2011-01-14 | 2015-09-08 | Venter Pharma, S.L. | Non-invasive diagnostic method for the evaluation of intestinal lactase deficiency (hypolactasia) |
CN107050915A (zh) * | 2017-06-01 | 2017-08-18 | 湖北恒贸茶油有限公司 | 带结晶导出区的茶油结晶罐 |
Families Citing this family (1)
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EP1887017A1 (en) * | 2006-08-09 | 2008-02-13 | Friesland Brands B.V. | Prebiotic carbohydrate |
Citations (3)
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ES2023556A6 (es) * | 1990-06-18 | 1992-01-16 | Consejo Superior Investigacion | Procedimiento de obtencion de 4-o-beta-d-galactopiranosil-d-xilosa utilizable para la evaluacion diagnostica de la lactasa intestinal. |
ES2100131A1 (es) * | 1995-11-08 | 1997-06-01 | Consejo Superior Investigacion | Procedimiento enzimatico de obtencion de beta-d-galactopiranosil-d-xilosas utilizables para la evaluacion diagnostica de la lactasa intestinal. |
ES2130073A1 (es) * | 1997-05-28 | 1999-06-16 | Consejo Superior Investigacion | Mejoras en el procedimiento de obtencion de beta-d-galactopiranosil-xilosas utilizables para la evaluacion diagnostica de la lactasa intestinal. |
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US4228274A (en) * | 1976-09-28 | 1980-10-14 | Merck & Co., Inc. | 1-Substituted glycopyranosides |
SE8203925D0 (sv) * | 1982-06-23 | 1982-06-23 | Svenska Sockerfabriks Ab | New and novel glycosides, glycoconjugates and processes for their preparation |
WO1995008645A1 (en) * | 1993-09-23 | 1995-03-30 | New England Biolabs, Inc. | Isolation and composition of novel glycosidases |
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Cited By (3)
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US9128100B2 (en) | 2011-01-14 | 2015-09-08 | Venter Pharma, S.L. | Non-invasive diagnostic method for the evaluation of intestinal lactase deficiency (hypolactasia) |
US9529000B2 (en) | 2011-01-14 | 2016-12-27 | Venter Pharma, S.L. | Non-invasive diagnostic method for the evaluation of intestinal lactase deficiency (hypolactasia) |
CN107050915A (zh) * | 2017-06-01 | 2017-08-18 | 湖北恒贸茶油有限公司 | 带结晶导出区的茶油结晶罐 |
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US20040241811A1 (en) | 2004-12-02 |
MXPA03011869A (es) | 2005-03-07 |
CA2451065C (en) | 2012-09-11 |
AU2002314215B2 (en) | 2006-11-16 |
JP4115933B2 (ja) | 2008-07-09 |
EP1408118A1 (en) | 2004-04-14 |
ES2182703A1 (es) | 2003-03-01 |
EP1408118B1 (en) | 2006-03-29 |
CA2451065A1 (en) | 2002-12-27 |
DE60210278T2 (de) | 2006-12-14 |
ES2260444T3 (es) | 2006-11-01 |
US7537909B2 (en) | 2009-05-26 |
ES2182703B1 (es) | 2004-06-01 |
RU2316593C2 (ru) | 2008-02-10 |
RU2004101406A (ru) | 2005-05-10 |
JP2004537298A (ja) | 2004-12-16 |
PT1408118E (pt) | 2006-08-31 |
ATE321876T1 (de) | 2006-04-15 |
DE60210278D1 (de) | 2006-05-18 |
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