Flos Sophorae exerts antioxidant and prebiotic actions, chili pepper has potent coloring capacity, thus this study investigated whether combination of Flos …

The highest anti-inflammatory response was obtained when 60°C, E2, and 150 min were used for the extraction, and nitric oxide (NO) production was reduced to 22.56%. Based on the results obtained...

Nitrogen exists in different oxidation states which makes the process of its removal from water complex and challenging. Adsorption or co-precipitation treatment is most often not feasible due to the stability and high solubility of nitrate, resulting in high energy and cost for treatment of nitrate-contaminated water (Rezvani et al., 2019).Most …

1. Introduction Nitrite (NI) and nitrate (NA) are commonly used as food additives to cured meats as red color preservers, stabilizers, and antibacterials against Clostridium botulinum. However, in the stomach, at low pH, NI reacts with primary and secondary amines to form carcinogenic species known as nitrosamine compounds.

Enzymatic-assisted extraction (EAE) has been used in many fruit and seed products ().Chouaibi et al. described the chemical composition of red pepper seeds and establish that more than 43% are cellulose complex that forms the cell wall.Additionally, Zhang et al. explained that when raw seeds from chili pepper are solar or industrial …

Ventricina is a traditional sausage made from pork meat produced in the Abruzzi and Molise regions. The aim of this study was to detect the content of nitrates and nitrites in local cultivars of chilli pepper, and their concentration in ventricina samples spiced with the same chilli pepper. Furthermore, it was examined whether, in the samples of …

Determination of nitrate, nitrite and ammonium in field-moist soils by extraction with potassium chloride solution ? Part 2: Automated method with segmented flow analysis. Buy. ... M., S trickland, J.D.H. Nitrate reduction and the occurence of a deep nitrite maximum in the ocean off the west coast of South America. J. Marit. Res., 26, 187-201 ...

The present study investigates the use of supercritical fluid extraction (SFE) for obtaining an extract rich in bioactive compounds. First, some variable ... antioxidant activity and inhibition of nitrite production in LPS-stimulated Raw 264.7 cells ... a Instituto de Química Médica, Consejo Superior de Investigaciones Científicas (IQM-CSIC

Nitrite and nitrate can be directly measured by UV absorbance detection at 210–220 nm or by their conductivity. However, most of the methods for nitrite and nitrate …

An aqueous two-phase extraction process composed of tetrahydrofuran/ammonium sulfate to extract nitrite from urine samples is investigated. The method is based on the reaction of nitrite with o-phenylenediamine in acid media to form benzotriazole and the aqueous two-phase extraction of benzotriazole in the presence of salt as an inducing agent in phase …

1. Introduction Nitrite and nitrate exist widely in the environment and food products. These salts have been used as additives in the food industry for a long time. Their principal function is to suppress the propagation of food poisoning microorganisms, notably Clostridium botulinum [1].

Abstract. We describe a fast and reliable procedure for the efficient extraction of nitrites in cured meat using microwave-assisted heat and report their in …

Nitrate determination from fresh plant material is common in routine analysis, but comparisons between extraction solutions, detection techniques or combinations of both show that there is a wide range in performance in methods determining plant nitrate. In this paper, the performance of methanol:water (1:1, V:V) as an extraction solution was ...

FIG. 5. Zinc dust will reduce nitrate to nitrite, but will not further reduce nitrite to nitrogen gas or other nitrogenous by-products when used sparingly. PROTOCOL For either substrate, NO3-or NO 2-, inoculate the medium with a heavy inoculum from well-isolated colonies of the test organism. Incubate at 35°C for 12 to 24 hours.

Procédé. Le nitrate de soude est extrait du caliche, le mélangenaturel de différents sels alcalins qu'on retrouve à un mètreou plus sous la surface du désert. Le caliche est broyé …

An Ultrasound Assessed Extraction Combined with Ion-Pair HPLC Method and Risk Assessment of Nitrite and Nitrate in Cured Meat. An accurate IPC-UV method was developed and validated for the determination of nitrite (NI) and nitrate (NA) in meat products. The best separation was achieved on a phenyl-hexyl column (150 mm × …

Two simple and fast methods for the extraction of the nitrite ion (NO2−) from food samples have been developed. The methods were characterized by UV−visible spectroscopic and electrochemical measurements, and their performance for NO2− extraction was compared with a standard method. The extraction methods yielded relative recoveries between …

Abstract. An accurate IPC-UV method was developed and validated for the determination of nitrite (NI) and nitrate (NA) in meat products. The best separation was achieved on a phenyl-hexyl column (150 mm × 4.6 mm, 3 µm) with a mobile phase composed of 25% acetonitrile and 75% buffer (2 mM disodium hydrogen phosphate and …

Introduction Nitrite and nitrate are widely used as preservatives in meat products, and play a pivotal role in microbiological safety, controlling lipid oxidation and developing characteristic color and flavor ( Perea-Sanz et al., 2020, Pini et al., 2020 ).

The extraction efficiency of Co (II) reaches the maximum of 99.16%, while the extraction efficiencies of Ni (II), Mn (II), and Li (I) are 9.27%–9.80% under the following conditions: 30vol% of N263 and 15vol% of iso-propyl alcohol in sulfonated kerosene, the volume ratio of the aqueous-to-organic phase is 2:1, the extraction time is 30 min, and 1...

A modification of AOAC Method 973.31 is proposed to improve the extraction efficiency of nitrite from cured meat samples and its subsequent quantification based on the diazotization-coupling reaction of sulfanilamide with N- (1-naphthyl)ethylenediamine dihydrochloride (NED). The various experimental parameters were thoroughly investigated.

Abstract. A study was undertaken to determine the extent of loss of nitrite during the analytical workup of cured meats for nitrite analysis. Two extraction techniques were compared: (A) a relatively long (2 hr) and hot (80°C) procedure carried out at the natural pH of the sample, and (B) the method of Sen and Donaldson that specifies an …

Two extraction techniques were compared: (A) a relatively long (2 hr) and hot (80°C) procedure carried out at the natural pH of the sample, and (B) the method of …

There are no regulations in Canada that prevent individual consumers from purchasing sodium nitrite, either for its intended use or …

Cloud-point extraction (CPE) is an extraction technique based on the clouding phenomenon of surfactants and was first introduced by Watanabe and Tanaka to preconcentrate metal ions from aqueous samples [21]. At certain temperature, aqueous solution of a non-ionic surfactant becomes turbid.

Two simple and fast methods for the extraction of the nitrite ion (NO2−) from food samples have been developed. The methods were characterized by UV−visible spectroscopic and …

Chile Exports of nitrites, nitrates to Canada was US$303.26 Thousand during 2021, according to the United Nations COMTRADE database on international trade. Chile …

FOREWORD This Food Additives Status List, formerly called Appendix A of the Investigations Operations Manual (IOM), organizes additives found in many parts of 21 CFR into one alphabetized list....

1 Scope This part of ISO 14256 describes an automated method for the determination of nitrate, nitrite and ammonium in a 1 mol/l potassium chloride extract of field-moist soil samples. This part of ISO 14256 is applicable to all types of soils homogenized by suitable methods. 2 Normative references

However, in ventricina samples with sodium nitrate added, an average quantity of nitrates at t 0 of 134±20.9 mg/kg was detect, whereas nitrites have never been found (5.0 mg/kg) at t 0, while after 50 days of ripening values of nitrates and nitrites were 129.0±15.4 and 28.8±15.8 mg/kg, respectively.

Decolorization and cloud point extraction procedure were developed for separation and preconcentration of nitrite in urine and plasma, as shown in Fig. 1.In order to find the appropriate conditions for this study, different experimental parameters were studied and optimized using urine and plasma samples spiked with nitrite.

Our bioinformatics analysis revealed that a large fragment DNA (19.8 kb) is deleted from the B7 genome, thus resulting in the deletion of three genes, including CaGpiP1 encoding a glycosylphosphatidyl-inisotol (GPI)-anchored protein, CaNRT2.1 encoding a membrane-bound nitrate/nitrite transporter, and CaRQH1 encoding a RecQ …

Two simple and fast methods for the extraction of the nitrite ion (NO2−) from food samples have been developed. The methods were characterized by UV−visible spectroscopic and electrochemical measurements, and their performance for NO2− extraction was compared with a standard method.

Two extraction techniques were compared: (A) a relatively long (2 hr) and hot (80°C) procedure carried out at the natural pH of the sample, and (B) the method of Sen and Donaldson that specifies an alkaline solution and much milder conditions (20 min at 50°C at pH 8) for extraction.

The aim of the present study was to extract the volatile compounds of Habanero peppers, using solvent extraction and solvent-assisted flavor evaporation (SAFE) methods, and to analyze them using gas chromatography-mass spectrometry (GC-MS).