Top Tweets for #pharmaceuticalmethods
#Potency is the concentration (EC50) or dose (ED50) of a drug required to produce 50% of that drug's maximal effect. Efficacy (Emax) is the maximum effect which can be expected from this drug.
#PharmaceuticalMethods
#Drug_evaluation may be defined as the determination of identity, purity and quality of a drug. Identity is the identification of biological source of the drug. Quality is the quantity of the active constituents present.
#PharmaceuticalMethods
Linear dichroism is the differential #absorption between two orthogonal components of linear polarized light. Circular dichroism is the differential absorption between left and right circular polarized light components.
#PharmaceuticalMethods
Stripping methods are generally more sensitive than other #voltammetric techniques because of a preconcentration step which accumulates the desired analyte on the surface of the electrode.
#PharmaceuticalMethods
JRC scientists developed a quantitative method for measuring the surface energy and #hydrophobicity of nanomaterials, as the knowledge about hydrophobicity is important when assessing potential risks of chemicals.
#PharmaceuticalMethods
Magnetic particles with immobilized #antibodies to various antigens have been employed for the rapid isolation of populations T-(CD4 +, CD3 +, CD8+) and B- (CD19+) of lymphocytes, NK cells, and monocytes.
#PharmaceuticalMethods
A typical #HILIC application uses acetonitrile at a concentration between 50-95% in an aqueous buffer such as ammonium formate, ammonium acetate or their acids, which have high solubility in organic solvents.
#PharmaceuticalMethods
Mechanical or optical problems in #detector usually can be traced to the flow cell. Detector-related problems include leaks, air bubbles, and cell contamination. These usually produce spikes or baseline noise on the chromatograms or low sensitivity.
#PharmaceuticalMethods
A #peak in the region around 2200 cm-1 – 2050 cm-1 is a subtle indicator of the presence of a triple bond [C≡N or C≡C] . Nothing else shows up in this region.
#PharmaceuticalMethods
m/z represents mass divided by charge number and the horizontal axis in a #mass_spectrum is expressed in units of m/z. Since z is almost always 1 with GCMS, the m/z value is often considered to be the mass.
#PharmaceuticaLMethods
#Analytical_toxicology staff work in laboratories to detect, identify and measure drugs and other potentially harmful chemicals in body fluids for the diagnosis, treatment and prevention of poisoning.
#PharmaceuticalMethods
Pauly's test is a specific test for #proteins containing tyrosine and histidine as the reagent undergoes diazotization with aromatic groups. The reaction is performed under cold conditions as the diazonium compound can only form at cold temperatures.
#PharmaceuticalMethods
Class 3 solvents have low toxic potential to humans and do not need a limit. Most of these #impurities occur due to manufacturing processes, degradation, storage conditions, excipients, or contamination.
#PharmaceuticalMethods
#GMP ensures that companies execute consistent procedures within safe environments. It prevents contamination, recalls, and loss of profit. GMP comes with strict protocols that lessen the risk of manufacturing errors.
#PharmaceuticalMethods
#Precipitation_gravimetry is an analytical technique that uses a precipitation reaction to separate ions from a solution. The chemical that is added to cause the precipitation is called the precipitant or precipitating agent.
#PharmaceuticalMethods
#Aluminum forms an oxine complex that can be quantitatively precipitated from aqueous solution between pH 4.2-9.8; it can thus be precipitated from an acetic acid - acetate buffer solution or from an ammoniacal solution.
#PharmaceuticalMethods
For #TEM, the sample is fixed, post-fixed, dehydrated and embedded in resin. The sample is then microsectioned and mounted onto a grid for TEM imaging. For SEM, the sample is fixed, post-fixed in some cases, dehydrated and mounted onto a stub.
#PharmaceuticalMethods
PIDs use a #high_energy_ultraviolet (UV) light source to ionize the molecules in a sample collected by an air pump. PIDs cannot detect methane, the principal component of natural gas, because this substance is not ionized by UV.
#PharmaceuticalMethods
Analytical range is the “best” #precision of measurement obtained over a concentration range multiplied by a factor acceptable to the analyst.
#PharmaceuticalMethods
#Prospective_process_validation is validation conducted prior to the distribution of either a new product, or a product made under a revised manufacturing process, where the revisions may affect the product's characteristics.
#PharmaceuticalMethods
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