Tìm thấy 12+ kết quả cho từ khóa "Chromatographic conditions"
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Optimization of the chromatographic conditions. In order to optimize the chromatographic conditions, 2 3 central composite face centered design of experiments (CCFC DoE) was employed, which involved a set of 11 planned experiments, and investigation of two experi- mental factors: buffer concentration (x1), in a range from 1 to 10 mM, and buffer pH value (x2), in a range from 9.0 to 10.2.
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The delay time between the UV detector of the cap-LC and the NMR flow cell has to be cal- ibrated for all chromatographic conditions due to the changes of viscosity of the different solvent compositions, which has an effect on the pump of the cap-LC. HPLC conditions are not always reproducible when analytical and prep-HPLC columns are used to isolate different amounts of the analytes of interest.
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Objectives: Establishing an HPLC method that is suited with current conditions of the laboratory to quantify 2,3,5,4’-tetrahydroxystilbene-2-O-β-D-glucoside (THSG) in dry extract of Radix Fallopiae multiflorae. Material and methods: Parameters of the method are validated including:. Results: Chromatographic conditions of the method: using Sunfire RP-C18 column, acetonitrile and 0.1% aqueous formic acid as mobile phase following a multistep gradient program, monitored at 320 nm.
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Objectives: Establishing a HPLC method that was suitable with current conditions of the laboratory to quantification of trans-resveratrol in Rhizoma reynoutriae japonicae. Material and methods: Parameters of the established method are validated including: linear range, precision, accuracy. Results: Chromatographic conditions of the method: using Sunfire RP-18 column, acetonitrile and 0.1% formic acid as mobile phase following a multi-step gradient program, monitored at 305 nm.
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In the present work, no ion suppression effects were observed under the optimized sample preparation and chromatographic conditions. Results of the postcolumn analyte infusion experiment showed negligible ion suppression or enhancement at the retention time of analytes and ISs (Figure 5a–5e). Further, quantitative evaluation of the matrix effect was also carried out for all the analytes and ISs from the peak area response and expressed as matrix factors as shown in Table 5..
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The selection of chromatographic conditions is examined further in Figure 6.21b. Based on what is known about the sample, initial conditions are selected for the separation (e.g., as in Table 6.1) and an initial run is carried out (step 1 of Fig. Alternatively, a single gradient separation can be used (step 1b. In some cases a change in separation conditions or chromatographic mode may be indicated (step 3).
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Objectives: To establish an UPLC/UV-Vis method that is suited with current conditions of the laboratory to quantify silybin A and B in dry extract of milk thistle. Parameters of the method are validated including: linear range, precision, accuracy. Chromatographic conditions of the method: using Cortecs UPLC BEH column (C 18 . The established method has good precision (RSD = 2.37%) and accuracy (recovery ratio average RSD = 2.84%)..
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Under the chromatographic conditions described in the experimental section the blank chromatogram was shown in Figure 3a, PSMA I&T chromatogram (Figure 3b) and 68 Ga-labeled PSMA I&T chromatogram (Figure 3c) were used for analytical HPLC method validation.
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The chromatographic conditions of the Hong Kong Pharmacopoeia [6] were used to investigate the chromatographic column. The results of analysis by the C18 InertSustain column showed that the peaks R1, Rg1, Re, Rb1 separated most clearly, and the resolution of peaks Rg1 and Re was 1.6, which is acceptable. particle size 5µm) chromatography column and the mobile phase consisted of ACN and water with gradient program in Table 1 at the flow rate of 1.6 mL/min.
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We investigated the chromatographic conditions for quantifying AST in SGR referring to Vietnamese Pharmacopoeia V, the conditions were as follow: C18 column mm i.d.. Consequently, the mobile phase of MeOH - H 2 O (38 : 62, v/v) gave the best separation of AST peak, and high feasibility for implementation. compounds in the matrix had a relatively strong interaction with the column so the total analysis time was relatively long.
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The initial optimization studies started with the chromatographic conditions suggested by Chamseddin and Jira, except for the length and particle size of the column, which were different from the original method.. Japan) was used for the separation of NAC and antibiotics. Therefore, the system suitability and selectivity of the method were initially tested for NAC and antibiotics.
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The analyte could be analyzed at six different pH values at a particular organic composition (isocratic mode) for an estimate of the analyte s s pH and for determination of the suitable chromatographic conditions to analyze the analyte.. If the chromatographer intends to determine the chromato- graphic pK a and understand the influence of mobile-phase pH on the target analyte retention, pH scouting studies need to be performed in isocratic mode..
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Stress degradation conditions for M PER M AML, and M IND:. With the proposed chromatographic and spectrophotometric methods, the Coverdine tablets were successfully analyzed in the presence of the indicated ingredients (Figure 4). One of the validation parameters, accuracy, was achieved by adding a known amount of pure drug active compound to Coverdine tablet solutions.
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The optimization of the chromatographic parameters benefited from chemometric methods. Firstly, a 2-level full factorial design was applied to learn the effects of chromatographic variables on retention time of EZE.. Peak area value. Peak areas of EZE derivative obtained from different derivatization conditions.. Significance of the parameters was determined at the 95% probability level (P = 0.05).
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TẠM NGỪNG VÀ CHẤM DỨT HỢP ĐỒNG BỞI NHÀ THẦU PART III – Conditions of Contract 4/103January 2011 PV Power – PV Power TB2 2 x 600MW Thai Binh 2 Power Plant EPC RFP Document 16.1 Quyền tạm ngừng công việc bởi Nhà thầu Chấm dứt Hợp đồng bởi Nhà thầu Ngừng công việc và di dời thiết bị của Nhà thầu Thanh toán khi chấm dứt Hợp đồng .
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These two actions occur as soon as the if statement is analyzed, and both use the value of conditions to react in unique ways. weather_mc movie clip instance to a frame label based on the value of conditions.. If conditions has a value of "Rainy", the weather_mc movie clip instance moves to that frame label, where the weather appears rainy. The next action determines what will be displayed in the weatherText_txt text field in the lower-right portion of the stage.
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Your project may contain numerous conditions you can use to control the way your script works or interacts with the user. A movie clip's position, size, or other property is greater than, less than, or equal to another value. The user has a specific interaction with the mouse or keyboard. Text or numeric values are greater than, less than, or equal to another value
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The tendency of HPLC conditions to denature a protein can be ordered as follows: RP HIC ≈ IEC >. 13.3.2 Role of Protein Structure in Chromatographic Behavior. Protein retention in HPLC can be understood as an interplay between protein structure and the chromatographic process. In the case of small solute molecules, most parts of the molecule are in contact with the stationary phase.
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All of these tools take advantage of the fact that the retention of a given compound will change in a predictable manner as a function of virtually any continuous chromatographic variable.. A simplistic description of the chromatographic zone migration through the column under gradient conditions is given in Chapter 2.
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s errors, unsafe vehicle conditions and roads and bridges condition and other. Road user?s errors includes in Vietnam include speeding, dangerous overtaking, drunk driving, poor road observation, misuse of lanes and pedestrian, making up 66.4% of the total number of sample accidents. Unsafe vehicle conditions, roads and bridges conditions and others made up and 28.5% of the total number of road accidents respectively..