WO2000028305A1 - Verfahren zur quantitativen bestimmung von polyasparaginsäure - Google Patents
Verfahren zur quantitativen bestimmung von polyasparaginsäure Download PDFInfo
- Publication number
- WO2000028305A1 WO2000028305A1 PCT/EP1999/008229 EP9908229W WO0028305A1 WO 2000028305 A1 WO2000028305 A1 WO 2000028305A1 EP 9908229 W EP9908229 W EP 9908229W WO 0028305 A1 WO0028305 A1 WO 0028305A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- determination
- iii
- salts
- content
- polyaspartic
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/82—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a precipitate or turbidity
- G01N21/83—Turbidimetric titration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/68—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids
Definitions
- the present invention relates to a method for the quantitative determination of polyaspartic acid (PASP) and its derivatives in aqueous formulations.
- PASP polyaspartic acid
- PASP polyaspartic acids
- PASP polyaspartic acids
- DE-A 4 221 875 describes the production of modified polyaspartic acids by polycondensation and their use as additives for detergents, cleaning agents, water treatment agents and scale inhibitors when evaporating sugars.
- polyaspartic acids according to DE 19 647 293 Cl and DE 19 700 493 AI can be used in membrane processes, in surface treatment and in process and waste water treatment.
- polycarboxylates generally means, in addition to the group of polyaspartic acids and their derivatives, above all the group of polyacrylic acids, their homo- and copolymers and their salts.
- the polyacrylates are usually acrylic acid homopolymes or copolymers based Acrylic acid and maleic acid or based on maleic acid and methyl vinyl ether. They can have an acidic, neutral or basic character.
- polyaspartic acid is used in the automotive industry, in water treatment or in the textile and leather sector.
- the DE 3842747 disclosure slip describes a method for determining the concentration of polyacrylates.
- the method is based on the method of quantitatively determining the polyacrylate content of an aqueous system containing interfering cations by contacting the polyacrylic acid complexed with polyvalent cations in contact with an ion exchange resin to substantially remove the interfering cations. Then the aqueous
- the conventional way is to determine the carboxyl content of polyacrylic acid using the iron thiocyanate method.
- the iron thiocyanate method is based on the formation of a colorless complex between iron (III) and polyacrylic acids, while a complex formed between iron (III) and thiocyanate ions is red.
- the further object of the present invention is to use a suitable method to make reproducible statements about the content of polyaspartic acids (PASP) in aqueous formulations, even in the presence of other ingredients. So far, no method is known that guarantees this differentiation, i.e. takes cross influences into account and is sensitive enough to reliably determine even low levels of PASP.
- PASP polyaspartic acids
- the object of the present invention is achieved in that the difficulties described above can be eliminated by determining the polyaspartic acid content by means of turbidity titration with transition metal salts under special boundary conditions.
- the present invention relates to a method for the quantitative determination of polyaspartic acid in aqueous formulations, characterized in that the determination by turbidity titration with salts of transition metals, preferably with such salts of cations selected from the series: Cr (III), Fe (II), Fe (III), Cu (II), Cd (II).
- turbidity titration with transition metal salts enables the content of polyaspartic acids in aqueous formulations to be high
- the consumption of standard solution eg FeCl 3 solution
- the calibration curve can be used to establish a correlation between the consumption of the standard solution and the time required for this.
- FeCl3 immediately precipitates out of the solution, which forms the turbidity.
- Fe polyaspartate is formed because Fe (III) is trapped by excess polyaspartic acid (sodium salts)
- the turbidity of the solution due to Fe (OH) 3 increases only very slowly.
- the equivalence point is reached where all polyaspartic acid (sodium salts) is bound to Fe (III) and Fe (OH) 3 can now precipitate out unhindered. It is determined, for example, by the maximum in the first derivative of the transmission curve.
- this method permits a very precise determination of the polyaspartic acids even in the presence of other ingredients, that is to say also in the case of cross influences. In many cases, the possible influence of other ingredients can be minimized so that even complex mixtures of aqueous formulations can be reliably determined.
- This method thus enables an efficient and quick determination of the
- the average molecular weight (M) of the polyaspartic acids which can be determined using the method according to the invention can vary within a wide range, polyaspartic acids with a molecular weight of 500 to 100,000 g / mol being preferably used. However, polyaspartic acids with a molecular weight of 1,000 to 50,000 g / mol, particularly preferably 1,000 to 30,000 g / mol, are particularly preferred.
- the molecular weight distribution can be about
- transition metal salts especially the cations of the elements of the first transition series, complex aminocarboxylic acids.
- polyaspartic acids form stable complexes with many cations of the transition metals and alkaline earth metals.
- the following cations can be used with PASP to form the respective complexes: Al (III), Cr (III), Fe (II), Fe (III), Cu (II), Cd (II), Pb ( II), Pb (IV), Sn (IV).
- Fe (II) and (Fe (III) cations are preferably used, and Fe (III) ions are particularly preferably used.
- the property of the polyaspartic acids is used to decompose at an elevated temperature in an acidic environment. This occurs primarily in the pH range between 0 and 7 and in a temperature range between 10 ° C to 200 ° C.
- a pressure range between 1 bar and 10 bar is preferably selected. Of course, higher pressures can also be selected. If appropriate, the decomposition can also take place under the influence of microwaves, even under pressure.
- Decomposition can also be promoted by using ultrasound or shock waves.
- the cross influences of other ingredients can now be minimized or eliminated sustainably by titrating all ingredients with transition metal salts, preferably with iron salts, by a suitable choice of a parameter (temperature or pH), or by a suitable choice of a combination of these Parameters, polyaspartic acids specifically decomposed, and then after titration of the other ingredients to the content of polyaspartic acids by difference closes in the aqueous formulation. If necessary, the sensitivity can be increased by evaporating the PASP sodium salt solution.
- the measuring device for carrying out the turbidity titration according to the invention can consist of a thermostated reaction vessel, preferably with a magnetic stirrer.
- vessels with a different drive type can also be used. The use of thermostatted vessels is always advantageous.
- the measuring device consists of one machine each to ensure the constancy of the pH range and for dosing the cation solution.
- other devices and / or methods can also be used for this purpose, for example burettes, buffers with or without indicators, pH electrodes and other acid / base additives and combinations of these devices and / or methods.
- the turbidity that occurs can be recorded optically and / or by measuring the turbidity, for example via a photometer, and is then forwarded to an evaluation system, for example to a recorder, to a data acquisition device or with the aid of a computer.
- the measuring device consists of a thermostatted reaction vessel with a volume of approx. 120 ml with magnetic stirrer, which is driven by a Metrohm ® magnetic stirrer drive.
- a Metrohm ® 719S Titrino is used to adjust the pH.
- a Metrohm ® Dosimat 665 takes care of the dosing. The data of the turbidity occurring is recorded using a Metrohm ® Photometer 662, a Delphin ® box and forwarded to the computer, where it is run in the MS-
- a calibration curve is first created from the dilution series of a polyaspartic acid solution of known concentration. The dosing time is plotted on the ordinate and the percentage of PASP is shown on the abscissa (FIG. 1). For example, a solution of a polyaspartic acid with an approximate molecular weight M w of 3,000 is selected as the standard for polyaspartic acid.
- polyacrylates or surfactants in aqueous formulations with polyaspartic acids were examined.
- the property of the polyaspartic acids is used, under the influence of temperature and / or pH or in a suitable manner
- polyaspartic acids can also be differentiated from other ingredients and that the time units to be expected are met with high accuracy until the titration is completed.
- Detection using the Metrohm ® photometer 662 is recorded in a Delphin ® box and evaluated on a computer (MS-DOS Excel ® ). The measured time is multiplied by the calculated slope of the calibration curve and, taking into account the dilution factor 25, gives the final result in% by weight.
- thermoblock thermostat LT 1 W, manufacturer: Dr. Lange
- Iron (III) chloride (p.A. Riedel-deHaen) solution 0.005 m borax solution 0.005 m consisting of
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Immunology (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Pathology (AREA)
- General Physics & Mathematics (AREA)
- Biochemistry (AREA)
- Urology & Nephrology (AREA)
- Molecular Biology (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Biomedical Technology (AREA)
- Hematology (AREA)
- Proteomics, Peptides & Aminoacids (AREA)
- Biotechnology (AREA)
- Microbiology (AREA)
- Cell Biology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Plasma & Fusion (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99971915A EP1129334A1 (de) | 1998-11-11 | 1999-10-29 | Verfahren zur quantitativen bestimmung von polyasparaginsäure |
AU11576/00A AU1157600A (en) | 1998-11-11 | 1999-10-29 | Method for the quantitative determination of polyaspartic acid |
KR1020017005889A KR20010080977A (ko) | 1998-11-11 | 1999-10-29 | 폴리아스파르트산의 정량적 측정 방법 |
CA002350204A CA2350204A1 (en) | 1998-11-11 | 1999-10-29 | Method for the quantitative determination of polyaspartic acid |
JP2000581435A JP2002529730A (ja) | 1998-11-11 | 1999-10-29 | ポリアスパラギン酸の定量測定方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19852083A DE19852083C2 (de) | 1998-11-11 | 1998-11-11 | Verfahren zur quantitativen Bestimmung von Polyasparaginsäure |
DE19852083.2 | 1998-11-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000028305A1 true WO2000028305A1 (de) | 2000-05-18 |
Family
ID=7887480
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/008229 WO2000028305A1 (de) | 1998-11-11 | 1999-10-29 | Verfahren zur quantitativen bestimmung von polyasparaginsäure |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1129334A1 (de) |
JP (1) | JP2002529730A (de) |
KR (1) | KR20010080977A (de) |
AU (1) | AU1157600A (de) |
CA (1) | CA2350204A1 (de) |
DE (1) | DE19852083C2 (de) |
WO (1) | WO2000028305A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111257503A (zh) * | 2020-04-01 | 2020-06-09 | 李岩 | 基于滴定分析法检测高含铬铝合金的铬含量的方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4000083A (en) * | 1974-05-06 | 1976-12-28 | B°V° Chemie Combinatie Amsterdam C°C°A° | Sequestering agents |
DE3842747A1 (de) * | 1987-12-18 | 1989-07-13 | Mobil Oil Corp | Verfahren zur bestimmung der konzentration von polyacrylsaeure in einer loesung mit mehrwertigen kationen |
WO1993024661A2 (de) * | 1992-05-29 | 1993-12-09 | Basf Aktiengesellschaft | Verwendung von kondensaten der asparaginsäure als belagsverhinderer bei der eindampfung von zuckersäften |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3007764A1 (de) * | 1980-02-29 | 1981-10-15 | Boehringer Mannheim Gmbh | Verfahren und reagens zur bestimmung der beta -lipoproteine |
-
1998
- 1998-11-11 DE DE19852083A patent/DE19852083C2/de not_active Expired - Fee Related
-
1999
- 1999-10-29 WO PCT/EP1999/008229 patent/WO2000028305A1/de not_active Application Discontinuation
- 1999-10-29 AU AU11576/00A patent/AU1157600A/en not_active Abandoned
- 1999-10-29 JP JP2000581435A patent/JP2002529730A/ja active Pending
- 1999-10-29 EP EP99971915A patent/EP1129334A1/de not_active Withdrawn
- 1999-10-29 KR KR1020017005889A patent/KR20010080977A/ko not_active Application Discontinuation
- 1999-10-29 CA CA002350204A patent/CA2350204A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4000083A (en) * | 1974-05-06 | 1976-12-28 | B°V° Chemie Combinatie Amsterdam C°C°A° | Sequestering agents |
DE3842747A1 (de) * | 1987-12-18 | 1989-07-13 | Mobil Oil Corp | Verfahren zur bestimmung der konzentration von polyacrylsaeure in einer loesung mit mehrwertigen kationen |
WO1993024661A2 (de) * | 1992-05-29 | 1993-12-09 | Basf Aktiengesellschaft | Verwendung von kondensaten der asparaginsäure als belagsverhinderer bei der eindampfung von zuckersäften |
Non-Patent Citations (2)
Title |
---|
"Ullmanns Enzyklopädie der technischen Chemie, Band 5,Analysen und Messverfahren", 1989, VERLAG CHEMIE, DE, XP002131699 * |
PEIFANG LUO, RICHARD P.BALDWIN: "LCEC of Underivatiized Polypeptides and Proteins at Copper Electrodes", ELECTROANALYSIS, vol. 4, 1992, US, pages 393 - 401, XP000881191 * |
Also Published As
Publication number | Publication date |
---|---|
AU1157600A (en) | 2000-05-29 |
DE19852083A1 (de) | 2000-05-25 |
JP2002529730A (ja) | 2002-09-10 |
KR20010080977A (ko) | 2001-08-25 |
EP1129334A1 (de) | 2001-09-05 |
CA2350204A1 (en) | 2000-05-18 |
DE19852083C2 (de) | 2000-12-07 |
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