Determination of amine value

Determination of amine value. The linearity, repeatability, and recovery of the method … Specific lengths of the fatty and polyoxyethylene chains of ethoxylated fatty amines are critical to their performance in specific applications, and thus the ability to characterize these surfactants accurately is crucial. 53 0. doi: 10. Jan 15, 2012 · A Gas chromatographic-Head space (GC-HS) method was developed and validated for the determination of Diethylamine and Triethylamine. Determination of the amine value by non-aqueous titration in glacial acetic acid with perchloric acid. Two of those methods are based on potentiometric titration ASTM D2074 Total, Primary, Secondary and Tertiary Amine Values of Fatty Amines by Alternative Indicator Method Lubricants, drilling fluids, engine oils, coolants, hydraulic fluids and many other industrial fluids contain amine additives as corrosion inhibitors and acid neutralizers. 1 ref. A simple and rapid method using high-performance liquid chromatography (HPLC) was developed to quantitatively determine the concentration of amine collectors (including Jul 1, 2015 · 2. SCOPE Aug 8, 2013 · A general methodology for the determination of pK a values by CE was proposed in 1992, and further refined by the addition of terms concerning the rate of electroosmotic flow and a method of handling potential discontinuities between buffer electrolytes. Feb 1, 2007 · Three different methods for the determination of the amine hydrogen equivalent weight in aliphatic amine epoxide hardeners were compared. Adding the two pK a values together and dividing by 2 gives us a value of 5. Normal Test Reporting Time 3. and 55 ± 10 pmoles/10 7 cells from Bisogno et al. 5 Determination of Aliphatic Primary Amines by Flow Injection Fluorometry Using Beryllium-Schiff Base Complexes. This test Aug 16, 2021 · Determination of amines, especially biogenic ones, which occur in samples with a complex matrix (food, plants, solid samples) is a much more serious challenge. Reference ASTM D 1652 and D 2074 (modified by D-9-J). Mar 14, 2007 · For "short-chain" alkyl primary amines, where the solvation around the amino group is expected to be the same, the standard potential value appears to follow a linear relationship with the number of carbon atoms, which indicates that the methylene group (-CH2-) causes an inductive effect that is responsible for the stabilization of the amine accurate determination of various pharmaceuticals, some acids in foods, use of some acids or bases in detergents, cosmetics and textile auxiliaries, in the analysis of industrial process streams, the analysis of polymers [1 – 7] . In 2017, Ferreira et al. All of the above methods for analyzing aqueous amine solutions have one or more major difficulties and none of the methods can analyze for all of the components in the solution. 526 0. 2 Normative references. For compounds such as polyamines with more than one ionizable center (atom or functional group), there is a pK(a) value fo … The enantiopure amine 5 is a valuable chiral source for the synthesis of chiral ligands and organocatalysts. It is common to compare basicity's of amines by using the K a 's of their conjugate acids, which is the corresponding ammonium ion. 3 and 102. D. The developed microextraction approach provided effective calcium separation from food sample matrices (extraction recovery 97%) and satisfactory selectivity for its determination by the inexpensive, simply operated chiral primary amine (Scheme 2). [2] The chemical substance may be a fat, oil, natural or synthetic ester, or other polyol. DSC could also be used with success for the determination of the amine hydrogen equivalent This document provides a procedure for determining the epoxide equivalent of epoxy resins and the amine value of polyamide resins. Using FF glutaric anhydride ester as a coating hapten and antibody raised against modified FFA, an ELISA was developed that showed an IC50 value of 0. The titration of amines with a strong acid in nonaqueous medium also affords good results [4]. 95 and 1. According to the order of addition for each amine cited in Table 3, increasing volumes (ml) containing 25–300, 50–500 and 25–250 μg of benzidine, m-aminophenol and p-phenylenediamine are mixed into separated sets of 25 ml volumetric flasks with the optimum amounts of DNFB and base as cited in Table 1, in addition to 1. 97 for the isoelectric point. 8 ml of tween-80 in the case nitrogen compounds such as fatty amine salts of quaternary ammoniums linked to one or more long chain alkyl hydrophobic moieties. Determination of the amine number in the laboratory: permits the determination of the total, primary, secondary, and tertiary amine values of fatty amines and diamines, and the total amine value of fatty amidoamines. 0. Consider the reactions for a conjugate acid-base pair, RNH 3 + − Equivalent weight is a calculated value determined from the amine number (also known as the amine value or amine alkalinity). Dec 1, 2023 · We used color component values in RGB (red, green, blue) color model as analytical signals for the calcium quantification. 3. Diethylamine is mostly used in the production of rubber primary, secondary and tertiary amine groups [2,4]. Wet methods routinely used are total amine value (ASTM Method D2073) combining weight or neutralization equivalent primary, secondary, and tertiary amine content (ASTM Method D2083) moisture, Kad-Fischer (ASTM Method D2072) and iodine value, measure of unsaturation (ASTM Method D2075). Dec 20, 1999 · On the other hand, in the primary alkyl amine hydrochloride series, such as 1-phenylethyl amine and 1-(p-nitrophenyl)ethyl amine, the IRIS values are obtained as 0. 2 secondary amine value , nÑthe number of milligrams of potassium hydroxide (KOH) equivalent to the secondary amine basicity i n1gof sample. Therefore, the ability of these probiotic cultures to produce biogenic amines could be considered a contrastive feature to the beneficial Jan 31, 2012 · The currently valid threshold limit value and MAK value for air is 5 mL/m 3 and 15 mg/m 3, respectively. Weak bases such as amines can be titrated in aprotic solvents with good accuracy if a very strong acid is used as the titrant. Do I have to know how much titrant and how much sample they used to get this Department of Planning, Transport & Infrastructure Field Services Section Technical Services Group Procedure Determination of the Total Amine Value of an Adhesion Agent and the Percentage of Adhesion Agent in Precoat TP780 Revision: 3. Unfortunately, the link between the analysis report and the amine system operation is often unclear. Determination of Cations and Amines in Hydrogen Peroxide by Ion Chromatography Using a RFIC™ (Reagent-Free) System (AU 155) Hydrogen Peroxide 0. Use this method to determine the epoxide equivalent for epoxy resins and the amine value for polyamide resins. The uncertainty results from several factors that can lead to The total amine values in samples reacted at lower temperature and longer reaction time (S5, AV = 7. Feb 2, 2024 · The pK a values of N-3, N-3′′, and N-4′′′ amines were determined using both 15 N and 1 H chemical shift data and showed good agreement, while pK a values of N-2′ and N-6′ were determined only from 1 H chemical shifts (Figure Figure4 4 B–D). The type of amine compound used depends upon the type and function of the fluid. This page titled 15. Acid value & base value measurements. The pK a values for glycine, for example, are 2. 48 ng/mL. [2] It may be defined as the number of milligrams of potassium hydroxide (KOH) equivalent to one gram of epoxy hardener resin. 530 mm I. This means that these functional groups would be Another way is the oxidation of amines by sodium chlorite and subsequent iodometric determination of excess reagent [2]. 0% m/m Monochloroacetic acid 0. NOTE: Due to the variations In titrations, color potassium hydrogen g per-chloric acid rx. talanta. It is important in both research and industrial practice to quantify amine concentration in the solution and/or wastewater. The subject of interest here, however, is only the total amine value, which is assumed to vary directly with the total AS additive con­ centration. Fortunately, the K a and K b values for amines are directly related. [70] described a method for the extraction of NH 4 + and low-molecular amines from brines by steam distillation. Table of contents. 0 ml of the 0. Hence, the commercial ethyleneamines have all types of amine group present in their structure and are suitable for testing determination procedures. 05 to 1. However, some of the disadvantages include the time-consuming and labor-intensive nature of measurements and the requirement of solutions of accurately known concentrations (Dimzon and Knepper, 2015). 3 mmol/kg. 1. Sep 9, 2016 · I am given an amine number of 2. To develop amine oxidases for the rapid detection of BAs, the genes for amine oxidases from Arthobacter aurescens TC-1, designated AMAO1, AMAO2, and AMAO3, respectively Jul 11, 2024 · If the chiral amine is not enantiopure, the number of accessible stereoisomers increases to 24. Nov 28, 2020 · Comparing the NCO and amine value data of the 4 companies tested, both conform to the above-mentioned amine value calculation method when the hypothetical NCO index is 1. The oil bath temperature was maintained within a Oct 1, 2023 · Biogenic amines (BAs) are nitrogen compounds formed during decarboxylation of amino acids with the participation of bacteria. Determination of aromatic amines. The PEI used in our study is a branched chain polymer with a ratio of 1:2:1 of primary:secondary: tertiary amines with a branching Jan 1, 1992 · 1. 4 total amine value, n the number of milligrams of Feb 1, 2007 · Three different methods for the determination of the amine hydrogen equivalent weight in aliphatic amine epoxide hardeners were compared. Identification and semi-quantitative determination of T 770 (a monomeric HALS) was demonstrated by Reiter et al. The epoxide equivalent is calculated based on the weight of the epoxy sample and the volume and normality of HBr used. Jan 5, 2016 · PEI is a more unique polyelectrolyte. Samples for acetylation and two blanks were refluxed for 1 h under constant stirring in a mineral oil bath. The amount of sample used depends on the expected amine number. The primary amine has a pK a value of 4. May 2, 2022 · Amines were discovered by Wurtz in 1849 and were initially called “artificial alkaloids”. Two of those methods are based on potentiometric titration and the other one uses differential scanning calorimetry (DSC). 9mol/l Di-n-butylamine When used for amine value determination of polyurethane raw materials, this application can be used as a basis for compliance with ASTM D6979-03 or ISO 25761. Blank value This titration is performed as back titration, therefore the blank value must first be determined. The method uses the self-assembly of 2-formylphenylboronic acid with a chiral diol and a chiral amine or derivatives (of unknown chirality) to produce two diastereomeric iminoboronates that differ in their fluorescence intensity and polarization. X 3 µ column with carrier gas nitrogen having pressure of 2. 555. Jan 22, 2015 · Values of 100–800 mg tyramine have been reported as toxic doses in food (Silla-Santos 1996). The recommended volume used for the titration should be between 30% and 70% of the total burette volume. The overall, average retention time RSD was 0. Next, we draw a straight line through each pair of points, extending the line through the vertical line that indicates the equivalence point’s volume (Figure 9. Analytical Sciences 1992, 8 (3) Download scientific diagram | Determination of the amine hydrogen equivalent weight for the system tetraethylenepentamine (TEPA)/epoxy resin DER 331 (187 g eq À 1 ) by DSC: (a) D H as a function Dec 25, 2014 · Functional groups of chitosan and agarose including amine and hydroxyl groups have pKa values well above the pH value of tumor [20] [21][22]. Mar 9, 2022 · A multi-purpose tool for food inspection: Simultaneous determination of various classes of preservatives and biogenic amines in meat and fish products by LC-MS. The three methods give similar values. The antibody showed a cross-reactivity of 100% with FFA, 97% with FF, 6% with thiamphenicol, and a negligible value with chloramphenicol. 1±0. Introduction. The measured IOH value Hydroxyl value. 9% for five different commercial hindered amine light stabilizers. Report the amine value to the nearest whole number. 4 In reporting the result of a test or analysis made in accordance with this standard, if the final value, observed or calculated, is to be rounded off, it shall be done in accordance with IS : 2-1960*. 5, secondary: 6. 4) and further reductions in basicity are unlikely to lead to dramatic property changes based on amine basicity alone (though Jan 9, 2023 · Tyramine was either detected low or moderate in all the three types of meat. Download: Download high-res image (313KB) Aug 11, 2023 · Next, we add points representing the potential at 110% of V eq (a value of 1. 7 × 10 −5)% - (5. b) Correlation of the NIR predicted values with the reference data as a result of a quantitative method development of the amine number in dipping paint. 14 for the N-terminal amino group of ubiquitin, determined from the 15 N chemical shift, is at the upper limit of experimental values for proteins reported in the literature, which Jul 11, 2024 · If the chiral amine is not enantiopure, the number of accessible stereoisomers increases to 24. Detection was good peak shapes for amines without the addition of an organic solvent to the eluent. 3 tertiary amine value, n the number of milligrams of potassium hydroxide (KOH) equivalent to the tertiary amine basicity i n1gof sample. To calculate how many grams of amine curing agent would be required to cure 100 grams of epoxy resin, which is known as PHR, the formula shown in Figure 2 is used. For this reason, the adjustment of the pH value is crucial to favor the interactions between the When used for amine value determination of polyurethane raw materials, this application can be used as a basis for compliance with ASTM D6979-03 or ISO 25761. 07 – 785 ng o. We believe that this application of orthogonal dynamic covalent self-assembly in the determination of the enantioselectivity will lead to the development of high-throughput procedures for the determination of chirality. 3 tertiary amine value , nÑthe number of milligrams of potassium hydroxide (KOH) equivalent to the tertiary amine basicity i n1gof sample. The blank value determination is carried out under the same conditions as the sample titration: 30 ml of dried Toluene are placed in a 250 ml glass beaker (tall form, without spout), 20. Use each system of units separately. 1 These referee test methods cover the potentiometric determination of the total, primary, secondary, and tertiary amine values of fatty amines and diamines, and the total amine value of fatty amidoamines. Foreword. 7, and tertiary: 11. 2017. 0 license and was authored, remixed, and/or curated by Anonymous via source content that was edited to the style and standards of the LibreTexts platform. This procedure is based on an acid-base reaction performed in glacial acetic acid. 54 0. I wish I had the molecular weight. c. 9 The integration of the peaks in the 1H NMR spectrum corresponding to the two diastereoisomers formed thus infers the ee of the chiral primary amine initially used. The amine value is calculated based on the weight Aug 27, 2020 · However, Kb values are often not used to discuss relative basicity of amines. 08, that is, the measured amine value is within the reasonable amine value range mentioned above, so our (pure) polyphamide value calculation method is reliable. amine from the sample and allowed the acid gases and H 2O to elute for analysis. 6 [27]. Preparation and Procedures. Feb 9, 2023 · Thankfully, the pK a values for all proteinogenic amino acids have been determined experimentally. Apr 27, 2021 · The published abundance values often show considerable scatter, examples being the reports for the levels of oleamide from the N 18 TG 2 values being 530 ± 300 pmoles/10 7 cells from Jeffries et al. Injector temperature was kept at 220°C and detector temperature was kept at 250°C. 2. Dec 1, 2007 · The determination of pK a values by UV–VIS assumes that the solute of interest is pure or that its impurities do not absorb in the UV–VIS range, since the spectra of impurities can overlap with those corresponding to the solutes of interest [5], [7], [8], [10], [13]. Regression model PLS with 5 factors Potentiometric titration is considered to be the most consistent and robust technique among the non-NMR methods (Czechowska-Biskup, 2012). The American Oil Chemists’ Society hy-droxyl value method (20) was followed to obtain the hy-droxyl value of ethoxylated amines with the following modifications. Dec 7, 2012 · Biogenic amines (BAs) that are produced through naturally occurring decarboxylation of amino acids have toxicological effects on humans. The literature value of 62. 6 1. The values found in this study (560 mg kg −1 means for both fermented milks) are within this range of toxicity. 64 mg KOH g −1 sample, S6, AV = 7. 50 0. May 26, 2014 · The lowest amine equivalent of TEPA is 31. Peak area %-RSD values for four quaternary amines, from 3. Test methods for primary, secondary, and tertiary amine values are not applicable to fatty amidoamines. 99. It involves titrating samples of the resins with a standardized hydrobromic acid (HBr) solution. Buy. 6 × 10 −8)% (Fig. Depending on the number of radicals, or groups linked to the nitrogen atom, we speak of primary, secondary or tertiary amines. A procedure for the determination of equivalent weight of amines is described. 2 secondary amine value, n the number of milligrams of potassium hydroxide (KOH) equivalent to the secondary amine basicity i n1gof sample. For this reason, the adjustment of the pH value is crucial to favor the interactions between the Aug 11, 2014 · An HPLC-UV method coupled with 9-fluorenylmethylchloroformate (FMOC) derivatization was developed for the determination of short chained amines in an environmental matrix. Mar 1, 2023 · In comparison with ammonia and aliphatic amines, PAAs are weaker bases owing to the direct attachment of the nitrogen atom to the aromatic system [17]. Download scientific diagram | Determination of amine value and amine group conversion (%) from publication: Isocyanate-free urethane vinyl ester resin: preparation, characterization and thermal Apr 18, 2007 · A simple method was developed for the determination of biogenic amines in aquatic food products using a reverse-phase high-performance liquid chromatography with postcolumn automatic o-phthalaldehyde derivatization and fluorescence detection. 2018; 178 :1053–1066. Jul 11, 2022 · Suppliers of amine curing agents will typically list this value on a certificate of analysis as Amine Hydrogen Equivalent Weight, or AHEW. after pre-heating a polymer sheet with a heat-gun to enhance desorption of the analyte [21]. These procedures are not applicable to fatty amidoamines and fatty diamines. The determination of the critical micelle concentration (CMC) value of surfactants under different environmental conditions is important for a number of different biological and chemical processes. The values given in parentheses (if provided) are not standard and may not be exact mathematical conversions. Using the Dionex IonPac CS17 column, a separation of the common inorganic cations, ammonium, and the four amines, mono-, di-, and trimethyl amine, and ethylamine was developed (Figure 1). 60 (for the ammonium). In general words, the amount of iodine that can react with a common mass’s fat is known as the “iodine value” or “iodine number” (100 grams). Determination of basicity (total amine value), expressed as percent nitrogen Plastiques — Polyalcools utilisés pour la production de polyuréthannes — Détermination de la basicité (valeur totale d’amines) en pourcentage d’azote INTERNATIONAL STANDARD ISO 25761 Second edition 2014-03-01 Reference number ISO 25761:2014(E) Calibration recovery values for four quaternary amines, from 12. Talanta. 50–52 The enantiopurity of chiral amine 5 can be determined by HPLC after its derivatization but it takes a lot of time, whereas by using this protocol it can be determined in five minutes (including the sample preparation time). A method based on high-performance liquid chromatography with diode array detector (HPLC–DAD) for the determination of eight biogenic amines in ripened meat products was developed and validated. 2 This standard does not purport to address all of the safety concerns, if any, associated with its use. 66 V at 55. Principle of iodine value Mar 10, 2021 · Alkyl amines are surfactants used as quartz collectors in the reverse flotation of phosphate ores. Normal-phase high-performance liquid chromatography (HPLC) and matrixassisted laser desorption ionization-time of flight (MALDI-TOF) mass spectrometry methods were developed Jul 16, 2022 · The poster is organized with more basic amines on the left, and less basic amines on the right, with a cutoff at pH 7 since amines with pKas lower than 7 are unlikely to be meaningfully protonated at physiological pH (~7. 4. A procedure that converts the quantity of acid or base present to a common standard of mg KOH needed to neutralize (for acids) or mg of “virtual” KOH available (for bases) per gram of material. Jun 8, 2015 · The approach allows for the accurate determination of the ee value of chiral amines with errors of just 1-2%. The saturation of the column with amine made reproducibility difficult. The sum of primary, secondary, and tertiary amines are determined by titration with standard perchloric acid in glacial acetic acid. The determination of the pK a or pK b values of organic compounds with acidity or basicity constant less Apr 12, 2017 · Calibration curves within the concentration range relevant for the analysis of real polymer samples (LOQ = 70 mg/L) were constructed with R 2 values above 0. (n=5). 0 Date: May 2012 Page 1 of 4 PURPOSE This procedure describes a method for determining the total amine value of an adhesion agent and the percentage of We report the first fluorescence-based assay for the rapid determination of the ee value of amines, amino alcohols, and amino acid esters. 2 d). The amine group nitrogen concentrations estimated for the three hardeners according to the international standard ISO 9702:1996 methods and the calculated values of amine hydrogen equivalent weight are shown in Table 2. 330mg/L When used for amine value determination of polyurethane raw materials, this application can be used as a basis for compliance with ASTM D6979-03 or ISO 25761. The pK a value of PAAs is variable, but most of them are positively charged at acid pH values. Many methods of the determination of aromatic amines are based When used for amine value determination of polyurethane raw materials, this application can be used as a basis for compliance with ASTM D6979-03 or ISO 25761. Fatty amine compositions made from a metathesis-derived C10-C17 monounsaturated acid, octadecene-1,18-dioic acid, or their ester derivatives are disclosed. 6 mg recovered 300 Interlaboratory Test Results for Free Amine Determination (all results in % mass by mass} Lab 1 Lab 2 Lab 3 Lab 4 Lab 5 Free amine content 0. The mechanisms of biogenic amines-dansyl-chloride formation were investigated and proposed. Thus, the complex can be readily used for ee determination of the amine. 08. This application note (download below) gives the detailed method and procedure tips for the determination of the amine value by nonaqueous titration. The biogenic amine derivatization method was Selectivity of Free Amine Determination Added impurity Free amine (% m/m) None 0. 4 total amine value , nÑthe number of milligrams of 3. [3] ASTM D 1957 [4] and ASTM E222-10 [5] describe several versions of this method of determining hydroxyl value. 0% m/m Glycolic acid 0. According to the List of MAK and BAT Values as well as TRGS 900, the short-time value for diethylamine is classified in peak limitation category I with an excursion factor of 2 [1, 2]. 2: a) The pre-treated spectra of dipping paints (λ = 1350–1430 nm) with varying amine number from 37. 5-3. Follow. This separation starts with a weak (0. 8 mM Mar 2, 2017 · The pK a of 9. Table 3. Chemical analysis in amine system operations C hemical analysis opens the door to understand-ing, responding to and preventing alkanolamine (amine) system operational difficulties. )) for seven amines in this study ranged from (4. 3 g/eq, as determined by potentiometry, was found because this technique measures the total hydrogen content, including primary and secondary amines. 3, and a viscosity range of 1000-2500 cts. Oct 8, 2019 · These alternative test methods cover the indicator procedure for determining the total, primary, secondary, and tertiary amine values of fatty amines. Bacterial amine oxidases are useful tools for the rapid quantification of BAs in foods. 005–0. [1] Specifically, it is usually used to measure the amine content of amine functional compounds. 10 Although the stereoisomerism of 1 is complex, the CD spectrum remains consistent for a large number of amines. In another aspect, fatty amidoamines made by reacting a metathesis-derived C10-C17 monounsaturated acid, octadecene-1,18-dioic acid, or their ester derivatives with an aminoalkyl-substituted tertiary amine are disclosed. 6 g/eq for TEPA ACROS obtained by potentiometry in a non aqueous medium and related to the first inflection of the primary Total amine value To analy2e fatty amines, both wet and instmmental methods of analysis are used. Apr 1, 2022 · p L o (atm) is the subcooled liquid vapor pressure of amine (the value of each amine can be found in Table S12). 1. The biogenic amines of the fresh meat sold in the wet market is generally higher than the reported values. For this experiment The conversion between hydroxyl value and other hydroxyl content measurements is obtained by multiplying the hydroxyl value by the factor 17/560. 0 mL). 1 Scope. When used for amine value determination of polyurethane raw materials, this application can be used as a basis for compliance with ASTM D6979-03 or ISO 25761. Amines are weak bases and are used in industrial chemical processes as well as in pharmaceuticals. 081. . 34 (for the carboxylic acid) and 9. An important parameter and quality indicator is the amine value (expressed in mg KOH/g sample). 03, respectively, so that these guests are not applicable for the ee determination [13]. 5 psi (Pound per square inch). Its determination has as the main objective the characterization of the crosslinking efficiency in polymer synthesis, and quality obtained for each amine base. 5 1. Practical Application. Determination of basicity (total amine value), expressed as percent nitrogen. Dec 1, 2009 · The procedure also provides value amine (milligrams of KOH per gram of hardener) for each compound. The pK(a) is the pH at which a functional group is 50% ionized. Scope 1. 10: Amines - Structures and Names is shared under a CC BY-NC-SA 3. They were found well separated on the DB-624, 30m x 0. Branched PEI has three pK a values depending on the degree of substitution of the amines. 3. The predictive fractions of physical adsorption process (Φ adsorption (Pred. Background 4,4'-Diamino-3,3'- dichlorodiphenylmethane (MOCA) is a diamine compound that is most commonly used as a curing agent in the production of urethane polymers. Sensor cleaning: In organic chemistry, amine value is a measure of the nitrogen content of an organic molecule. 70 V at 100. indi cations and sol ids determinations, the repeatability of this test method should be considered suspect only for amine value deviations of more than five. 45 mg KOH g −1 sample) were lower compared to samples When used for amine value determination of polyurethane raw materials, this application can be used as a basis for compliance with ASTM D6979-03 or ISO 25761. This assembly has been shown to be applicable to the determination of ee of a wide variety of different primary amines. Sep 15, 2022 · Amines are named by naming the alkyl groups attached to the nitrogen atom, followed by the suffix -amine. 0 mL) and at 200% of V eq (a value of 1. 1016/j. Measurement of Amine Value to Quantify MOCA in Polymers and Polymer Building Blocks. 62,63 An important step was made by Ishihama64 when he studied multivalent compounds and Amine number Fig. Feb 1, 2007 · Determination of the amine hydrogen equivalent weight by potentiometric methods. 5 mmol/kg to 48. 3), which were 5-8 orders of magnitude lower than the measured value. 133%, What is iodine value? Iodine value is the amount of iodine that 100 grams of a particular substance can absorb. Oct 11, 2023 · The main analytical methods for the determination of t,t-MA, S-PMA, S-BMA, HA, 2-MHA, 3-MHA and 4-MHA include gas chromatography-mass spectrometry (GC-MS) [14], high performance liquid chromatography with ultraviolet detection (HPLC-UV) [15, 16], high-performance liquid chromatography with diode array detector (HPLC-DAD) [17] and high-performance liquid chromatography-mass spectrometry (HPLC The extent of ionization of the polyamines is an important factor in their interactions with cellular components. 1 These alternative test methods cover the indicator procedure for determining the total, primary, secondary, and tertiary amine values of fatty amines. determination of acid value, amine value for reactive polyamides and non-reactive polyamides have been specified. 3 – 785 ng o. Aug 24, 2016 · DESI allows the determination of small to medium size HALS directly from the investigated sample whereby mainly the surfaces are probed [16]. The amine number is determined by titration of the amine acetate ion When used for amine value determination of polyurethane raw materials, this application can be used as a basis for compliance with ASTM D6979-03 or ISO 25761. This reaction may be also used for photometric determination [3]. Spiked extracts from polyolefin samples showed recovery rates between 97. Retention time precision with the Vanquish UHPLC system yielded very low relative standard deviation values (RSD). gnbsqdaf wxsyp yviaqtg knmiul hxtlbz xkvjy mkd zgscapj fcj yls