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Established in 2001, Puyang Zhong Yuan Restar Petroleum Equipment Co.,Ltd, “RSD” for short, is Henan’s high-tech enterprise with intellectual property advantages and independent legal person qualification. With registered capital of RMB 50 million, the Company has two subsidiaries-Henan Restar Separation Equipment Technology Co., Ltd We are mainly specialized in R&D, production and service of various intelligent separation and control systems in oil&gas drilling,engineering environmental protection and mining industries.We always take the lead in Chinese market shares of drilling fluid shale shaker for many years. Our products have been exported more than 20 countries and always extensively praised by customers. We are Class I network supplier of Sinopec,CNPC and CNOOC and registered supplier of ONGC, OIL India,KOC. High quality and international standard products make us gain many Large-scale drilling fluids recycling systems for Saudi Aramco and Gazprom projects.

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Direct Detection of a Sulfonate Ester Genotoxic Impurity ...
Direct Detection of a Sulfonate Ester Genotoxic Impurity ...

A direct, ambient ionization method has been developed using ,atmospheric pressure thermal desorption–extractive electrospray–mass spectrometry, (AP/TD-EESI-MS) for the detection of the genotoxic impurity (GTI) methyl p-toluenesulfonate (MTS) in a surrogate pharmaceutical matrix. A custom-made thermal desorption probe was used to the desorb and vaporize MTS from the solid …

Newer Developments in HPLC Impacting Pharmaceutical ...
Newer Developments in HPLC Impacting Pharmaceutical ...

For instance, to support process developments for ,API, synthesis and drug product manufacturing from complex drug molecules with multiple chiral centers, as many as 10-20 HPLC methods (achiral and chiral methods for raw materials, starting materials, intermediates, final drug substances and drug products) are typically developed in quick succession.

Development of a Surface Washing Agent Effectiveness ...
Development of a Surface Washing Agent Effectiveness ...

IOSC 2005 Control No. 427 A New ,Screening, Protocol for Testing the Effectiveness of Surface Washing Agents Karen M. Koran1, Albert D. Venosa2, Sylian Rodriguez1 1Pegasus Technical Services, Inc., 46 E. Hollister Street, Cincinnati, OH, 45219 2U. S. Environmental Protection Agency, 26 W. Martin Luther King Dr., Cincinnati, OH 45268 ABSTRACT The U. S. Environmental Protection Agency (EPA) is ...

Novel ‘Dilute-and-Shoot’ Liquid Chromatography–Tandem Mass ...
Novel ‘Dilute-and-Shoot’ Liquid Chromatography–Tandem Mass ...

By applying the method described above to the strict monitoring of a group of patients where the dose, time administered and time of sample collection are all known, it may be possible to develop cutoff concentrations for each drug in urine to determine if a patient is adherent or not, similar to other semi-quantitative urine ,screening, assays (e.g., drugs of abuse ,screening,).

QbD-Based Development and Validation of a Stability ...
QbD-Based Development and Validation of a Stability ...

System suitability ,test, of the chromatography system was performed by injecting six replicate injections of standard solution 25 µg/mL. Prior to sample analysis, percent relative standard deviation (% ,RSD,) of standard area and retention time for six suitability injections were determined and accepted below 2.0%.

Development of an UHPLC Method Using Agilent method ...
Development of an UHPLC Method Using Agilent method ...

8A: Overlay of 250 injections of final method. 8B: ,RSD, OF ,API, Area and RT of 250 injections are 0.81% and 0.04%. Peak tailing and back pressure observed was 1.3 and 150 bar. Rapid Optimization Results Figure 3: Results from the ,screening, experiments. HPH-C18 with pH 10.8 (2A), HPH-C8 with pH 10.8 (2B), Phenyl Hexyl with pH 8 (2C), EC-CN with pH ...

Rapid Screening of Amphetamine Drugs in Urine by Positive ...
Rapid Screening of Amphetamine Drugs in Urine by Positive ...

and high-throughput ,screening,. Only two product ions were used for this analysis because ,amphetamine, and methamphetamine only give two intense product ions (Figure 4, Table 2) while ephedrine, MDA, MDMA, and MDEA produce multiple intense product ions (Table 2). Run-to-run retention time is very reproducible with a <1.4% ,RSD,.

Frontiers | Biosensing the Histamine Producing Potential ...
Frontiers | Biosensing the Histamine Producing Potential ...

Histamine, poisoning is the most common cause of human foodborne illness due to the consumption of fish products. An enzyme-based amperometric biosensor was developed to be used as a ,screening, tool to detect ,histamine, and ,histamine,-producing bacteria (HPB) in tuna. It was developed by immobilizing histidine decarboxylase and horseradish peroxidase on the surface of screen-printed electrodes ...

Evaluation of the Developmental Toxicity of Linalool in ...
Evaluation of the Developmental Toxicity of Linalool in ...

1/3/2008, · In the reproductive and developmental toxicity ,screening test,, female rats were gavaged daily with 0, 250, 500, or 1000 mg/kg/day of coriander oil (72.9% linalool) in a corn oil vehicle, with daily dosing beginning 7 days prior to a 7-day cohabitation period with male rats and continuing until day 4 of lactation .

Newer Developments in HPLC Impacting Pharmaceutical ...
Newer Developments in HPLC Impacting Pharmaceutical ...

For instance, to support process developments for ,API, synthesis and drug product manufacturing from complex drug molecules with multiple chiral centers, as many as 10-20 HPLC methods (achiral and chiral methods for raw materials, starting materials, intermediates, final drug substances and drug products) are typically developed in quick succession.

WO2010007164A1 - Method of assaying an aminoadamantane ...
WO2010007164A1 - Method of assaying an aminoadamantane ...

This invention provides a method for assaying a memantine hydrochloride- containing sample, comprising analyzing the sample using a High Performance Liquid Chromatography (HPLC) system with a basic Refractive Index detector (HPLC-RI) under isocratic chromatographic conditions, so as to quantitate the memantine hydrochloride in the sample, wherein the method does not comprise the step of ...

Further Validation of a Rapid Screening Semiquantitative ...
Further Validation of a Rapid Screening Semiquantitative ...

1/1/2018, · The results of the SQ-TLC estimation of quantities of ,active pharmaceutical ingredients, in the antimalarial dosage forms analysed in this study were largely confirmed by HPLC quantification. The study has further validated the SQ-TLC technique as a rapid ,screening, tool that can be adopted for use in resource-constrained communities to reliably detect substandard antimalarial medicines.

A Review of Current Trends and Advances in Analytical ...
A Review of Current Trends and Advances in Analytical ...

14/12/2011, · Specification and ,test, methods for the commonly used ,API, and excipients are described in detail in pharmacopoeias. ... In order to shorten the analysis time Song et al. proposed a fast ,screening, method of lovastatin in red yeast rice products by flow injection tandem mass spectrometry without LC separation . 2 ... with a ,RSD, 4.29%.

Application of response surface methodology (RSM) in ...
Application of response surface methodology (RSM) in ...

The main objective of the present study was to develop and optimize an effervescent tablet of levetiracetam, an antiepileptic drug, using central composite design with response surface methodology (RSM).The present investigation helps to overcome the problem associated with levetiracetam tablets and liquid dosage forms with children and elderly people like bad taste and swallowing difficulties.

Wastewater Surveillance Testing Methods | CDC
Wastewater Surveillance Testing Methods | CDC

After sample collection, the first step in SARS-CoV-2, wastewater testing, is sample preparation. A matrix recovery control should be spiked into the sample during this step. The second step is sample concentration. The third step is RNA extraction from the concentrated wastewater sample.

Rapid Screening of Amphetamine Drugs in Urine by Positive ...
Rapid Screening of Amphetamine Drugs in Urine by Positive ...

and high-throughput ,screening,. Only two product ions were used for this analysis because ,amphetamine, and methamphetamine only give two intense product ions (Figure 4, Table 2) while ephedrine, MDA, MDMA, and MDEA produce multiple intense product ions (Table 2). Run-to-run retention time is very reproducible with a <1.4% ,RSD,.

Novel ‘Dilute-and-Shoot’ Liquid Chromatography–Tandem Mass ...
Novel ‘Dilute-and-Shoot’ Liquid Chromatography–Tandem Mass ...

By applying the method described above to the strict monitoring of a group of patients where the dose, time administered and time of sample collection are all known, it may be possible to develop cutoff concentrations for each drug in urine to determine if a patient is adherent or not, similar to other semi-quantitative urine ,screening, assays (e.g., drugs of abuse ,screening,).

Journal of Chemical and Pharmaceutical Research 2017 9 ...
Journal of Chemical and Pharmaceutical Research 2017 9 ...

Sitagliptin ,test, solution (2.0 mg mL-1) and (s)-enantiomer (2.0 mgmL-1) were prepared by dissolving the appropriate amount of the sample in the mobile phase. The ,test, …

Molecules | Free Full-Text | Development and Validation of ...
Molecules | Free Full-Text | Development and Validation of ...

The authors developed a 1H qNMR ,test, procedure for identification and quantification of impurity A present in gabapentin active pharmaceutical ingredient (,API,) and gabapentin products. The validation studies helped to determine the limit of quantitation and assess linearity, accuracy, repeatability, intermediate precision, specificity, and robustness of the procedure. Spike-and-recovery assays ...

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