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Griess reagent

Griess reagent is a chemical compound used in analytical chemistry to detect and quantify nitrite (NO2-) ions.
It is commonly employed in various research applications, including the measurement of nitric oxide (NO) production, environmental monitoring, and food analysis.
The Griess reaction involves the diazotization of sulfanilamide by nitrite, followed by coupling with N-(1-naphthyl)ethylenediamine to produce a purple azo dye that can be measured spectrophotometrically.
By optimizing Grieess reagent protocols and comparing methods from literature, preprints, and patents, researchers can enhance the reproducibility and accuracy of their nitrite-based assays, streamlining their research process and improving the reliability of their findings.
The PubCompare.ai platform offers an AI-driven solution to effortlessly compare Grieess reagent protocols, identify the most effective and reliable methods, and enhance the overall quality and efficiency of nitrite-based research.

Most cited protocols related to «Griess reagent»

NO and cell viability assays were performed as described during our previous work [18] (link). Briefly, RAW264.7 cells (1×106 cells/mL) were pre-incubated with RGSF (25, 50, 100, and 200 μg/mL) or vehicle for 30 min and then stimulated with LPS (100 ng/mL) for 18 h. One-hundred microliter of cell supernatant from each well were transferred into 96-well microplates and mixed with an equal volume of Griess reagent at room temperature. The absorbance at 540 nm was determined by a Spectramax 250 microplate reader. For cell viability test, 30 μL of 5 mg/mL 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) reagent was added to the culture plates and cell viability test was performed based on the reduction of MTT reagent into an insoluble, dark purple formazan product in viable cells.
Publication 2012
Biological Assay Bromides Cells Cell Survival Formazans Griess reagent RAW 264.7 Cells
The nitric oxide assay was performed as described previously with slight modification (Yoon et al., 2009 (link)). After pre-incubation of RAW 264.7 cells (1.5 × 105 cells/mL) with LPS (1 µg/mL) for 24 h, the quantity of nitrite in the culture medium was measured as an indicator of NO production. Amounts of nitrite, a stable metabolite of NO, were measured using Griess reagent (1% sulfanilamide and 0.1% naphthylethylenediamine dihydrochloride in 2.5% phosphoric acid). Briefly, 100 µL of cell culture medium was mixed with 100 µL of Griess reagent. Subsequently, the mixture was incubated at room temperature for 10 min and the absorbance at 540 nm was measured in a microplate reader. Fresh culture medium was used as a blank in every experiment. The quantity of nitrite was determined from a sodium nitrite standard curve.
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Publication 2009
Biological Assay Cell Culture Techniques Cells Culture Media Griess reagent Nitrites Oxide, Nitric Phosphoric Acids RAW 264.7 Cells Sodium Nitrite Sulfanilamide
Hydrogen sulfide quantification was performed as described by Nashef et al. (1977) (link). Briefly, strawberry leaf tissue was ground into fine powder with a mortar and pestle under liquid nitrogen and ~0.3g of frozen tissue were homogenized in 1ml of 100mM potassium phosphate buffer (pH 7) containing 10mM EDTA. The homogenate was centrifuged at 15,000 g for 15min at 4 °C and 100 μl of the supernatant was used for the quantification of H2S, in an assay mixture containing also 1880 μl extraction buffer and 20 μl of 20mM 5,5’-dithiobis(2-nitrobenzoic acid), in a total volume of 2ml. The assay mixture was incubated at room temperature for 2min and the absorbance was read at 412nm. Hydrogen sulfide was quantified based on a standard curve of known concentrations of NaHS.
Leaf hydrogen peroxide content was assayed as described by Loreto and Velikova (2001 (link)). Frozen leaf material (~0.1g) was homogenized on ice with 0.1% (w/v) TCA. The homogenate was centrifuged at 15,000 g for 15min at 4 °C and 0.5ml of the supernatant was added to 0.5ml of 10mM potassium phosphate buffer (pH 7.0) and 1ml of 1M KI. The absorbance of assay mixture was read at 390nm and the content of H2O2 was calculated based on a standard curve of known concentrations of H2O2.
Nitric oxide content was determined according to Zhou et al. (2005) (link). Briefly, frozen leaf material (~0.1g) was homogenized in 50mM cool acetic acid (pH 3.6) containing 4% zinc acetate and centrifuged at 10,000 g for 15min at 4 °C. The supernatant was collected and the pellet was washed with 0.5ml extraction buffer and centrifuged again. The two supernatants were combined and 0.1g charcoal was added. The mixture was agitated and centrifuged at 15,000 g for 15min at 4 °C. To 1ml of clear supernatant, 1ml Griess reagent was added and the mixture was incubated at room temperature for 30min. The absorbance of the mixture was read at 540nm and NO content was calculated by comparison to a standard curve of NaNO2.
Publication 2013
Acetic Acid Biological Assay Buffers Charcoal Edetic Acid Freezing Griess reagent Hydrogen Sulfide Nitrobenzoic Acids Nitrogen Peroxide, Hydrogen Plant Leaves potassium phosphate Powder sodium bisulfide Strawberries Tissues Zinc Acetate
The production of NO was estimated by measuring the amount of nitrite, a stable metabolite of NO, using the Griess reagent as described [14 (link)]. After THC-pretreated BV2 microglial cells were stimulated with LPS in 12-well plates for 24 hr, and then 100 µl of the cell culture media was mixed with an equal volume of Griess reagent. Light absorbance was read at 540 nm. The results were expressed as a percentage of released NO from LPS-stimulated BV2 cells. To prepare a standard curve, sodium nitrite was used to prepare a standard curve.
Publication 2012
Cell Culture Techniques Cells Culture Media Griess reagent Light Microglia Nitrites Sodium Nitrite
Our previous studies demonstrated that NO production in glial cells was mainly due to the induction of iNOS [9 (link)]. Therefore, measurement of NO was used to represent the induction process. NO released from cells was converted to nitrite in the culture medium, which was determined using the Griess reagent. In this study, cells were cultured in DMEM without phenol red. After treating cells with cytokines and LPS, aliquots (200 μl) of culture medium were transferred to test tubes and incubated with 100 μl of the reagent A (1% (w/v) sulfanilamide in 5% phosphoric acid, Sigma) for 10 minutes at room temperature in the dark. This was followed by incubation with 100 μl of reagent B (0.1%, w/v, N-1-napthylethylenediamine dihydrochloride, Sigma) for 10 minutes at room temperature in the dark. After mixing, 100 μl of the purple/magenta solution was transferred to a 96-well plate and the absorbance at 543 nm was measured within 30 minutes in a plate reader. The dilution series of sodium nitrite (0-100 μM) was used to generate the nitrite standard reference curve.
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Publication 2011
Cells Culture Media Cytokine Griess reagent Neuroglia Nitrites NOS2A protein, human phosphoric acid Rosaniline Dyes Sodium Nitrite Sulfanilamide Technique, Dilution

Most recents protocols related to «Griess reagent»

In plasma samples, the following oxidative stress markers were measured: nitrite (NO2), superoxide anion radical (O2), hydrogen peroxide (H2O2), and the index of lipid peroxidation (measured as TBARS – thiobarbituric acid reactive substances).
Nitric oxide decomposes rapidly to form stable metabolite nitrite/nitrate products. The nitrite level was measured and used as an index of nitric oxide (NO) production using the Griess reagent. A total of 0.5 ml of plasma was precipitated with 200 μl of 30% sulphosalicylic acid, vortexed for 30 min, and centrifuged at 3000 × g. Equal volumes of supernatant and Griess reagent containing 1% sulphanilamide in 5% phosphoric acid/0.1% naphthalene ethylenediamine dihydrochloride were added and incubated for 10 min in the dark, and the sample was measured at 543 nm. The nitrite levels were calculated using sodium nitrite as the standard [13 (link)].
The O2 concentration was measured after the reaction of nitro blue tetrazolium in Tris buffer with the plasma at 530 nm. Distilled water served as the blank [14 ].
The measurement of H2O2 is based on the oxidation of phenol red by H2O2 in a reaction catalysed by horseradish peroxidase (HRPO). Two hundred μl of plasma was precipitated with 800 ml of freshly prepared phenol red solution, followed by the addition of 10 μl of (1:20) HRPO (made ex tempore). Distilled water was used as the blank instead of the plasma sample. H2O2 was measured at 610 nm [15 (link)].
The degree of lipid peroxidation in the plasma samples was estimated by measuring TBARS using 1% thiobarbituric acid in 0.05 NaOH, incubated with the plasma at 100 °C for 15 min, and measured at 530 nm. Distilled water served as the blank [16 (link)].
The activity of the following antioxidants in the lysate was determined: reduced glutathione (GSH), catalase (CAT), and superoxide dismutase (SOD). The level of reduced glutathione was determined based on GSH oxidation with 5,5-dithiobis-6,2-nitrobenzoic acid using a method by Beutler [17 ]. The CAT activity was determined according to Aebi [18 (link)]. The lysates were diluted with distilled water (1:7 v/v) and treated with chloroform-ethanol (0.6:1 v/v) to remove haemoglobin, and then 50 μl of CAT buffer, 100 μl of sample and 1 ml of 10 mM H2O2 were added to the samples. The detection was performed at 360 nm. SOD activity was determined by the epinephrine method of Beutler [19 (link)]. Lysate (100 μl) and 1 ml carbonate buffer were mixed, and then 100 μl of epinephrine was added. The detection was performed at 470 nm.
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Publication 2023
Anions Antioxidant Activity Buffers Carbonates Catalase Chloroform Epinephrine Ethanol ethylenediamine dihydrochloride Griess reagent Hemoglobin Horseradish Peroxidase Lipid Peroxidation naphthalene Nitrates Nitrites Nitrobenzoic Acids Nitroblue Tetrazolium Oxidative Stress Oxide, Nitric Peroxide, Hydrogen Phosphoric Acids Plasma Reduced Glutathione Sodium Nitrite Sulfanilamide sulfosalicylic acid Superoxide Dismutase Superoxides thiobarbituric acid Thiobarbituric Acid Reactive Substances Tromethamine
NO- levels were measured in the supernatants collected from the MAP-infected MDMs after 2 h of infection with the Measure-iT ™ High-Sensitivity Nitrite Assay Kit (Invitrogen, Paisley, UK) according to the manufacturer's instructions. The assay has an optimal range of 20–500 pmol nitrite, making it up to 50 times more sensitive than colorimetric methods utilizing the Griess reagent. Nitrates are analyzed after quantitative conversion to nitrites through enzymatic reduction; used in this manner, the assay provides effective quantitation of NO-. Briefly, the supernatants from the MAP-infected MDMs after 2 h of infection (40 µl) were brought to a volume of 50 µl by adding 10 µl of H2O and placed into 96-well black plates in triplicate. Subsequently, 100 µl of quantitation reagent were added and mixed by pipetting. The plate was incubated for 10 minutes at room temperature and 5 µl of quantitation developer were added to each well and gently mixed by pipetting. Right after quantitation developer addition, fluorescence was measured using a multimodal microplate reader Synergy™ HTX (Biotek, Winooski, Vermont, US) at 365/450 nm (ex/em). A standard curve was prepared with the Measure-iT™ nitrite quantitation reagent concentrate included in the kit (0, 2.75, 5.5, 11, 22, 33, 44, 55 µM). Assays were conducted in duplicate in a final volume of 110 µl by adding 100 µl of quantification agent, fluorescence was measured, and plotted versus picomoles of NO-. The equation was used to determine the NO- concentration for each sample.
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Publication 2023
Biological Assay Colorimetry Enzymes Fluorescence Griess reagent Hypersensitivity Infection methylene dimethanesulfonate Multimodal Imaging Nitrates Nitrites
The NO2 concentration in culture media was measured to assess NO production in MGCs using Griess reagent. For each sample, 50 μl aliquots were mixed with 50 μl of the Griess reagent (1% sulfanilamide/0.1% naphthylethylene diamine dihydrochloride/2% phosphoric acid) in a 96-well plate. The absorbance at 550 nm was then measured on a microplate reader (SpectraMax M5; Molecular Devices). NaNO2 was used as the standard to calculate NO2 concentrations.
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Publication 2023
Culture Media Diamines Griess reagent Medical Devices Phosphoric Acids Sulfanilamide

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Publication 2023
Biological Assay Cell Culture Techniques Cells Culture Media Griess reagent Nitrites RAW 264.7 Cells Sodium Nitrite
RAW 264.7 cells were thawed and subcultured in 10% FBS and 1% antibiotic (penicillin and streptomycin)-supplemented DMEM culture medium. Cultured cells were kept in an incubator in a humidified atmosphere at 37°C and 5% CO2. For the cell viability assay, subcultured stock cells at around 90% confluency were collected and seeded into a 98-well plate with a cell density of 2.5×104 cells per well in DMEM supplemented with 10% FBS. Cells were left overnight and then treated with different concentration of extracts in DMEM supplemented with 10% FBS. Eighteen hours after treatment, cell viability was measured using the MTT assay kit following the manufacturer’s protocol.
LPS-induced nitric oxide (NO) production in RAW 264.7 cells is a highly exploited method in research, as a cellular inflammatory model. NO produced in this way can be quantified in a cell culture medium in the form of nitrite (NO2-), a stable degradation product of NO. For anti-inflammatory activity, the nitrite concentration in the medium was quantified by Griess reagent using the modified methods explained by Alhallaf and Perkins.43 (link) In brief, the subcultured cells were seeded at a cell density of 15×104 cells per well in a 48-well plate in DMEM supplemented with 10% FBS, and incubated overnight. Then, treatment was carried out at a non-toxic concentration in phenol red-free DMEM supplemented with 10% FBS and incubated at 37°C. One hour after incubation, inflammation was induced by adding LPS solution to make 1 µg/mL concentration in the culture medium. After 18 hours of treatment, the nitrite concentration was measured in the culture medium using Griess reagent (equal amounts of 1% sulfanilamide in 5% phosphoric acid + 0.1% naphthyl ethylenediamine di-hydrochloride in water). Then, 100 µL of culture medium was mixed with 100 µL of Griess reagent, and absorbance was measured after 10 minutes in a microplate reader at 540 nm wavelength. The quantity of nitrite in the cell supernatant was determined by comparison with the standard curve of sodium nitrite at different concentrations.
Publication 2023
Aftercare Anti-Inflammatory Agents Antibiotics Atmosphere Biological Assay Cell Culture Techniques Cells Cell Survival Cultured Cells Culture Media ethylenediamine hydrochloride Griess reagent Inflammation Nitrites Oxide, Nitric Penicillins phosphoric acid RAW 264.7 Cells Sodium Nitrite Streptomycin Sulfanilamide

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The Griess reagent is a chemical solution used in analytical chemistry and biochemistry. It is primarily utilized for the detection and quantification of nitrite ions (NO2−) in various samples. The reagent reacts with nitrite to produce a colored azo compound, which can be measured spectrophotometrically to determine the nitrite concentration in the sample.
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The Griess Reagent System is a laboratory product designed to measure nitrite levels. It provides reagents required to perform a colorimetric assay that quantifies the presence of nitrite in samples. The core function of the Griess Reagent System is to enable the detection and measurement of nitrite concentrations in various biological and environmental samples.
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The Griess reagent is a chemical reagent used in laboratory analysis. It is used to detect and quantify the presence of nitrite ions (NO2-) in a sample. The reagent reacts with nitrite to produce a colored azo compound, which can be measured spectrophotometrically.
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The LPS laboratory equipment is a high-precision device used for various applications in scientific research and laboratory settings. It is designed to accurately measure and monitor specific parameters essential for various experimental procedures. The core function of the LPS is to provide reliable and consistent data collection, ensuring the integrity of research results. No further details or interpretations can be provided while maintaining an unbiased and factual approach.
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The Griess reagent kit is a laboratory product designed for the detection and quantification of nitrite (NO2-) in various samples. The kit provides the necessary reagents and protocols to perform the Griess reaction, a colorimetric assay that allows for the indirect measurement of nitric oxide (NO) production. The kit is suitable for use in various research and diagnostic applications.
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Fetal Bovine Serum (FBS) is a cell culture supplement derived from the blood of bovine fetuses. FBS provides a source of proteins, growth factors, and other components that support the growth and maintenance of various cell types in in vitro cell culture applications.
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The Microplate reader is a versatile laboratory instrument used to measure and analyze the optical properties of samples in microplates. It is designed to quantify absorbance, fluorescence, or luminescence signals from various assays and applications.
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Griess reagent is a laboratory chemical used for the detection and quantification of nitrite ions (NO2-) in aqueous solutions. It is a colorimetric assay that produces a pink or purple-colored azo dye in the presence of nitrite ions. The Griess reagent is a commonly used analytical tool in various fields, including biochemistry, environmental analysis, and clinical diagnostics.
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DMSO is a versatile organic solvent commonly used in laboratory settings. It has a high boiling point, low viscosity, and the ability to dissolve a wide range of polar and non-polar compounds. DMSO's core function is as a solvent, allowing for the effective dissolution and handling of various chemical substances during research and experimentation.

More about "Griess reagent"

Griess Reagent: Unlocking the Power of Nitrite Detection Griess reagent is a versatile analytical tool used across various scientific disciplines, from environmental monitoring to biomedical research.
This chemical compound is a crucial component in the detection and quantification of nitrite (NO2-) ions, a crucial indicator of nitric oxide (NO) production.
The Griess reaction involves a two-step process: the diazotization of sulfanilamide by nitrite, followed by the coupling with N-(1-naphthyl)ethylenediamine to create a purple azo dye.
This dye can then be measured spectrophotometrically, allowing researchers to accurately determine nitrite levels in their samples.
Optimizing Griess Reagent Protocols By carefully comparing Griess reagent protocols from literature, preprints, and patents, researchers can enhance the reproducibility and accuracy of their nitrite-based assays.
This process can involve adjusting factors such as reagent concentrations, reaction times, and incubation temperatures to ensure optimal performance.
The PubCompare.ai platform offers an AI-driven solution to streamline this protocol comparison process.
By leveraging this tool, researchers can quickly identify the most effective and reliable Griess reagent methods, ultimately improving the quality and efficiency of their nitrite-based research.
Expanding Griess Reagent Applications Griess reagent is not limited to nitrite detection alone.
It can also be employed in the measurement of nitric oxide (NO) production, a crucial signaling molecule in various physiological and pathological processes.
Additionally, Griess reagent is utilized in environmental monitoring, food analysis, and other research applications where the quantification of nitrite is of importance.
Enhancing Research with Griess Reagent To further optimize Griess reagent-based research, researchers may also consider the use of related tools and techniques, such as the Griess Reagent System, lipopolysaccharide (LPS) stimulation, and microplate readers.
By integrating these complementary methods, researchers can gain a more comprehensive understanding of nitrite-related phenomena and unlock new insights in their respective fields.
By mastering the intricacies of Griess reagent and leveraging the power of AI-driven protocol comparison, researchers can streamline their workflow, enhance the reliability of their findings, and drive advancements in their areas of study.