164 results about "Food Analysis" patented technology

A compact spectrometer is disclosed that is suitable for use in mobile devices such as cellular telephones. In preferred embodiments, the spectrometer comprises a filter, at least one Fourier transform focusing element, a micro-lens array, and a detector, but does not use any dispersive elements. Methods for using the spectrometer as an end-user device for performing on-site determinations of food quality, in particular, by comparison with an updatable database accessible by all users of the device, are also disclosed.

The present disclosure provides methods and systems for providing personalized food and health management recommendations. A dietary glucose monitor may comprise a food analysis module in communication with a glucose level monitor, where the food analysis module may be configured to (1) analyze data indicative of foods consumed by a user, and (2) determine an effect of individual foods on a glucose level of the user, based on changes to the user's glucose level as measured by the glucose level monitor.

The invention relates to a method for detecting bisphenol A and bisphenol AF in food, belonging to technical field of analytical chemistry determination method. With ionic liquid (1-butyl-3-methylimidazole hexafluorophosphate) as an extractant and TritonX-100 or acetone as an dispersant, ultrasonic oscillation is carried out to form emulsion; after centrifugal separation, extraction drops at the lower layer are directly subjected to HPLC (high performance liquid chromatography) quantitative analysis. The method disclosed by the invention has the advantages of simpleness in detection steps, easiness in operation, low detection limit and high enrichment multiple, greatly reduced detection cost. The method disclosed by the invention is a rapid, efficient and environmentally friendly pre-treatment technology and has a wider application prospect in the field of food analysis.

The invention discloses a rapid bacterial detection method based on upconversion fluorescence resonance energy transfer, and belongs to the technical field of bacterial detection. The method includes the steps that the gold nanoparticle surface is modified with nucleic acid aptamers capable of specifically recognizing a target bacterium, the rare earth upconversion fluorescence particle surface is modified with cDNA paired with the aptamers complementarily, after the two kinds of nanoparticles are mixed, the distance between the two kinds of particles is reduced due to base complementary pairing of two nucleotide sequences, and therefore fluorescence of upconversion fluorescence particles is quenched by gold nanoparticles. When a target object is added, the target object and cDNA are competitively combined with the aptamers to recover fluorescence of upconversion fluorescence particles. The target bacterium is measured quantitatively according to different fluorescence recovery strength. The method is high in sensitivity and specificity, easy to operate, various target objects can be determined by changing aptamer sequences, and the rapid bacterial detection method is of great significance in environment monitoring and food analysis.

A food mixing unit is equipped with a weighing system having a memory device for storing at least one recipe of foods to be loaded into the mixing unit and at least one weight detecting device to detect the weight of the foods loaded. Foods to be loaded are taken from relative stocking areas and the food weight is controlled by the weight detecting device and based on the food recipe, as foods are loaded into the mixing unit. A plurality of chemical and / or physical parameters is measured for each of the food stored in the relative stocking areas by using of a food analysis tool and the food recipe is modified according to the measured values of chemical and / or physical parameters and rewritten in the memory device of the weighing system.

A food mixing unit is equipped with a weighing system having a memory device for storing at least one recipe of foods to be loaded into the mixing unit and at least one weight detecting device to detect the weight of the foods loaded. Foods to be loaded are taken from relative stocking areas and the food weight is controlled by the weight detecting device and based on the food recipe, as foods are loaded into the mixing unit. A plurality of chemical and / or physical parameters is measured for each of the food stored in the relative stocking areas by means of a food analysis tool and the food recipe is modified according to the measured values of chemical and / or physical parameters and rewritten in the memory device of the weighing system.

The invention discloses a rapid detection method for production process quality control of yellow wine, belonging to the technical field of food analysis and food safety, comprising the following steps: (1) carrying out dilution and determining capacity on a yellow wine sample with absolute ethyl alcohol; (2) mixing the diluted yellow wine sample with a 9-hydroxy-xanthene solution in a hydrochloric acid solution and reacting for 60 min at room temperature; and (3) carrying out component separation on the derivative yellow wine sample with high performance liquid chromatography, and calculating the content of urea and ethyl carbamate (EC) in the sample with the external standard method. According to the invention, by setting different parameters at different time periods for a fluorescence detector, the technical difficulty of simultaneously detecting the content of EC and urea in yellow wine is solved, a HPLC-FLD method for simultaneously detecting EC and urea in yellow wine is established, thus a rapid, convenient, accurate and effective monitoring method for yellow wine safety production is provided.

The invention relates to a method for promptly detecting biogenic amine in food and belongs to the food analysis and security technical field. The method for promptly detecting the biogenic amine in food comprises the following steps: (1) extracting the biogenic amine from food samples; (2) purifying biogenic amine extracting solution; (3) derivatizing the biogenic amine extracting solution; and (4) optimizing developing solvent and analyzing thin layer chromatography. The method for promptly detecting the biogenic amine in food can be used for promptly detecting biogenic amine content in products of fish, meat, cheese, wine, vinegar and the like. Compared with the other analysis methods, the method for promptly detecting biogenic amine in food has the advantages of being free of expensive analytical instruments, low in cost, easy to operate, fast, and capable of effectively lowering monitoring cost in food production and circulation.

The invention discloses a preparation method for a simple enzyme biosensor. The method includes: mixing prussian blue ink with carbon ink in certain proportion, then preparing a substrate electrode by a screen printing technique, using glutaraldehyde as the cross-linking agent to fix the bio-oxidase corresponding to a detected substance so as to realize preparation of the enzyme sensor. The method is easy to operate and low in cost, can realize batch preparation, and the loaded enzyme is difficult to leak, thus ensuring high-activity of bio-enzyme. The enzyme biosensor has high sensitivity and stable electric signal response, can realize mass production, and is easy to achieve industrialization. The prepared enzyme biosensor is applicable to hydrogen peroxide or glucose detection in food analysis, clinical medicine, and bioengineering.

The invention discloses a metal-organic frameworks (MOFs) material-based series molecular sieve and a preparation method and an application method thereof in complex sample purification and separation analysis, and relates to the technical field of chromatography application and the field of solid phase micro extraction. The series molecular sieve comprises an MOFs material-based solid phase micro extraction device and an MOFs material-based capillary gas phase chromatographic column; the MOFs material-based solid phase micro extraction device comprises a section of stainless steel fiber extraction head, the surface of which is coated with an MOFs material; and the MOFs material-based capillary gas phase chromatographic column comprises a section of capillary, the inner wall of which is uniformly coated with a layer of MOFs material. High-selectivity purification, efficient separation and specificity detection and measurement of a complex sample are realized by combined use of the solid phase micro extraction device coated with the MOFs material and the gas phase chromatographic column coated with the MOFs material. The series molecular sieve is favorable for large-scale popularization and application, and has broad application prospect in the fields of analytical chemistry, particularly environmental analysis, food analysis and the like.

Belonging to the field of food analysis, the invention relates to a method for detection of tea polysaccharide in Pu'er tea or a Pu'er tea extract. The detection method comprises the steps of: 1. preparing a glucose standard solution; 2. preparing a Pu'er tea or Pu'er tea extract sample into a detection solution; 3. measuring the absorbance of the standard reference solution and the detection solution by ultraviolet spectrophotometry, and drawing a standard curve; and 4. calculating the content of tea polysaccharide in the Pu'er tea or the Pu'er tea extract.

The invention discloses an up-conversion fluorescent aptamer-based side stream test paper detection method, and belongs to the technical fields of environment detection and food safety detection. A nucleic acid aptamer capable of specifically identifying target bacteria is modified on the surface of each nano-gold particle; cDNA which is in complementary pairing with the aptamer is modified on thesurface of each rare earth up-conversion fluorescent particle; and after the two kinds of nanoparticles are mixed, the basic groups of the two segments of nucleic acid sequences are in complementarypairing and the distance of the two kinds of particles are pulled closely, so that fluorescence of the upper-conversion fluorescent particles is quenched. After a target object is added, the target object can be bound with the aptamer with cDNA competitiveness, so that fluorescence recovery of the up-conversion nanoparticles is caused. According to different fluorescence recovery intensity, quantitative measurement of the target bacteria can be realized. The method provided by the invention is high in sensitivity, high in specificity and simple and convenient in operation, various target objects can be measured through change of the aptamer sequence, and very import significance in the aspects of environment monitoring, food analysis and the like is achieved.

The invention belongs to the odor detection technology, relates to the technical field of odor sample processing and smell and discloses a smell detection system based on an odor evaporation characteristic spectrum and a system thereof. The artificial smell technology has been widely applied in the field of detection of various types of odor, and the smell detection capability can be greatly improved through improving the volume of odor information obtained by a single sensor. The invention describes evaporation characteristics of a liquid sample based on the principles that the components of the liquid sample has different evaporation characteristics, and odor generated in evaporation at different time has different gas components and contents thereof during evaporation of the liquid sample of a finite volume, and a specific type of gas sensor responds to odor generated in evaporation at different time to obtain sensor signals changing along with the time, i.e. the odor evaporation characteristic spectrum. Therefore, the invention increases odor information obtained by the gas sensor, improves the accuracy of odor analysis and has great market application value in food analysis, security testing, medical treatment, public health and other aspects.

A food analysis device includes a variable wavelength interference filter adapted to disperse light reflected by the food into a plurality of lights with respective wavelengths, an imaging section adapted to image the lights with the respective wavelengths obtained by the dispersion to obtain spectral images corresponding respectively to the wavelengths, and a control section adapted to obtain spectrum of each of the pixels from the spectral images corresponding to the respective wavelengths, and then detect a pixel including the absorption spectrum of water, and then detect a plurality of components based on the spectrum of the pixel detected.

The invention discloses a rapid and automatic determination method and device for tripolycyanamide content in dairy products, belonging to the field of food analysis. The method comprises the following steps that: in a unit (A) under an operating procedure, a first step, a multifunctional valve is in a state I, a pump A rotates, a pump B stops, a first sample flows into a column 2 for enriching tripolycyanamide, and the eluent flows into a column 1 for regenerating tripolycyanamide; a second step, the pump A stops, the pump B rotates, the cleanout fluid flows into the column 2 for cleaning the impurities therein; a third step, the multifunctional valve is switched to a state II, eluent flows into the column 2 for eluting and regenerating tripolycyanamide; the tripolycyanamide in the column 2 is substituted by the eluent and directly enters into a sampling ring of a unit (B) in the form of a sample plug, so as to perform volume quantification, injection, re-separation and detection, and a response signal is processed by a computer; and meanwhile, a second sample enters into the column 1 for enrichment, and the process of the column 2 is repeated. The method and the device are high in automation degree and excellent in reproducibility, and can analyze about 30 samples per hour; and the unit (A) in the invention can be used with various flow injection analysis systems.

The invention relates to a method for extracting the gluten contained in a sample using an ethanol aqueous solution in the presence of a composition containing a disulphur group reducer and a decoupling agent, in a buffer having a pH of between 7 and 8. The inventive method can be used to extract quantitatively the gluten contained in a heat-processed or non-heat processed food sample before the quantification of the gluten by ELISA. The method is suitable for food analyses, in particular, for foodstuffs intended for celiac sufferers.

The invention relates to a protein enzyme-hydrolysis reactor which can change microcurrent control chip and the preparing method in the microcurrent control chip field. The reactor comprises a microcurrent control chip with two-tip single channel and a glass fiber(enzyme centre)fixed proteinase, wherein the enzyme centre penetrates the microcurrent channel of the chip and goes out from two tips, the enzyme centre modifies chitose film on the surface with dip-coating method by the glass fiber and is made by fixing the proteinase to the surface of the glass fiber with adsorption, embedding or covalence bond technique, the protein enzyme-hydrolysis reactor which can change microcurrent control chip is acquired by inserting the glass fiber enzyme centre in the micro channel of microcurrent control chip before using. The glass fiber enzyme centre has the inexpensive price, which can change according to the requirements, improves the using efficient of the chip and the enzyme, and reduces the measuring cost of enzyme method. The reactor has the good application prospect in the clinical diagnosis, the environmental monitoring, the life science research and the food analysis field.

The invention relates to detection system for an atmospheric pollution gas, and belongs to the technical field of environment protection. The detection system is used for the detection of air pollutants. The detection system is mainly characterized in that a single chip microcomputer PIC16F676 and a single chip microcomputer PIC12F675 are used as a control center for controlling the whole system; a software portion is written and programmed by using a module idea. Under the support of the software, the detection system has the advantages of intuitive display, easy operation, convenience for carrying and strong data processing capacity. Besides detection of the air pollutants, establishing a high-quality automatic detection system for air environment quality and having significant theoretical value and practical meaning for air protection and treatment, the detection system can be expanded to other occasions such as biology, medical treatment, food analysis and the like, is a novel portable energy-saving analysis system. The detection system is a novel air quality detection system integrating real time, intelligent, wireless and systematization together by using advanced computer technology, single chip microcomputer technology and wireless transmitter and receiver technology.

The invention discloses a method for identifying the false proof of sericin finishing products of fabric, which is characterized in that the method comprises analyzing the content of amino acid on the coating layers of fabric, calculating the percentage between the mass sum of aspartate and serine and the total mass of aspartate and serine and the percentage between the mass of amino acid with a polarized lateral group and the total mass of amino acid, and judging that the coating layers on fabric are sericin coating layers when the percentage content sum of aspartate and serine is bigger than and is equal to 42% and the percentage content sum of amino acid with a polarized lateral group is bigger than 70%. Since the analytic technique of amino acid content in food analysis is utilized, the mass percentage content of aspartate and serine and the mass percentage content of amino acid with a polarized lateral group are particularly analyzed, the method can accurately judge whether the coating layers are sericin or not.

The invention belongs to the technical field of food analysis, and particularly relates to a detection method for characterizing the brittleness of surimi gel. The method comprises the following steps: preparing a gel test sample from the surimi gel, placing the gel test sample onto a physical analyzer platform, performing compression and three-point bending test on the test sample by using a probe, performing fitting calculation according to a stress-strain curve to obtain a compression fracture strain epsilon value and a compression constant alpha value, and calculating an area under the curve before fracture according to a force-displacement curve, thereby obtaining an embrittlement work W value; building a surimi gel brittleness multiple-regression equation, in which the epsilon value,the alpha value and the W value are used as independent variables, so as to accurately characterize a brittleness value of the surimi gel. The detection method is high in operability, quick and accurate, and is favorable for detecting the product quality control property.

The invention discloses a synthesis method of green carbon quantum dots and application of the green carbon quantum dots in nitrite detection, and belongs to the technical field of food analysis and detection. The detection method disclosed by the invention specifically comprises the following steps: preparing green carbon quantum dots, drawing a fluorescence standard curve, pretreating a sample,and determining the concentration of nitrite in the sample. According to the invention, nitrosomercaptan is generated by utilizing the analyte nitrite and thiobarbituric acid through pi conjugation, and fluorescence quenching can be caused by the internal filtration effect between nitrosomercaptan and the green carbon quantum dots, so that the existence of nitrite is monitored. The system for detecting nitrite adopts green fluorescent carbon quantum dots, so that the detection cost is low, the reaction conditions are mild, the steps are simple, and the anti-interference performance is good. And the synthesis method of the green carbon quantum dots disclosed by the invention is simple to operate and convenient and rapid in purification, and has good industrial application potential.

The invention discloses a hydrophilic hyperbranched polyglycidyl ether anion magnetic adsorbent as well as a preparation method and application thereof, and belongs to the technical field of nano material preparation and food analysis application. The preparation method comprises the following steps: synthesizing magnetic nanoparticles Fe3O4 by adopting a solvothermal method; then synthesizing a solid polymer by taking the magnetic nanoparticles Fe3O4 as a carrier, polyglycidyl ether as a functional monomer and potassium methoxide and anhydrous tetrahydrofuran as solvents through anion ring-opening polymerization reaction; and finally, separating the solid polymer through an external magnetic field, and washing and drying the separated solid polymer to obtain the hydrophilic hyperbranchedpolyglycidyl ether anion magnetic adsorbent. The prepared hydrophilic hyperbranched polyglycidyl ether anion magnetic adsorbent is uniform in particle size, good in structural stability, strong in magnetic response, good in reusability, high in cochineal adsorption capacity, high in recovery rate, low in material cost and simple to prepare.

The invention relates to a biosensor for detecting Hx (hypoxanthine) in aquatic products and application thereof, and belongs to the field of food analysis. A fluorescence biosensor is built on the basis of the catalysis activity of Pt NPs (platinum nanoparticles), and is used for detecting the content of Hx in the aquatic products. A provided sensing system consists of XOD (xanthine oxidase), OPD(o-phenylenediamine) and Pt NPs; Hx reacts with oxygen under the existence of XOD to produce uric acid and H2O2; the Pt NPs can catalyze the oxidization reaction of the OPD and the H2O2 to produce 2,3-phenazine diamine giving out yellow fluorescence; and a fast, simple, convenient and sensitive aquatic product freshness degree detection method is provided. The novel detection method has the characteristics that the preparation of the Pt NPs is simple; the acquisition is easy; the simple and convenient analysis on the aquatic product freshness degree can be realized; the operation is simple; and the sensitivity and the selectivity are high. The popularization and the use are easy.

The invention relates to the field of food analysis and discloses a method of qualitatively analyzing sources of gelatin in hide gelatins. Acetone is used herein as a gelatin extracting agent for hide gelatins, specific endoproteinase Lys-C and trypsin are used to decompose polypeptides of different gelatin sources from hide gelatins into characteristic polypeptide fragments, a high-performance liquid chromatograph-linear ion trap and orbit trap high-resolution combined mass spectrograph apparatus is utilized in a single ion detection scanning mode to separate and detect gelatin enzymatic hydrolysates, a mass spectrum obtained is recorded, and mass spectrum analytical software is used to identify characteristic polypeptides in donkey hide gelatin, pig skin gelatin and cattle hide gelatin. The method provided herein can be used to identify donkey hide gelatin, cattle hide gelatin and pig skin gelatin among hide gelatin products, has high detection accuracy, good reproducibility and sensitivity, and can provide basis for relevant departments to monitor the quality of hide gelatin products.

The invention relates to a construction method of a GC-MS (Gas Chromatography-Mass Spectrometer) fingerprint chromatogram of ice wine, in particular to the construction method of the GC-MS (Gas Chromatography-Mass Spectrometer) fingerprint chromatogram of Wu Nu Mountain ice wine, belonging to the technical field of food analysis. The method is characterized by comprising the following steps of distilling the ice wine, collecting fractions with an initial boiling point of -102DEG C; taking steam of the fractions by using a headspace bottle method; constructing the fingerprint chromatogram by using the GC-MS. Compared with the prior art, the construction method for the fingerprint chromatogram, disclosed by the invention, has the beneficial effects of simplicity, quickness and no need of adding an organic solvent for extracting; the fingerprint chromatogram is high in accuracy, good in repeatability, clear and discernible in chromatogram and great in difference, and can be widely applied to mass discrimination of the Wu Nu Mountain ice wine.

The invention discloses an aptamer probe for detecting alpha-lactalbumin, beta-lactoglobulin and lactoferrin, and belongs to the technical field of IA (immunoassay) of food analysis. The nucleotide sequence of the aptamer probe for detecting alpha-lactalbumin, beta-lactoglobulin and lactoferrin disclosed by the invention is shown as SEQ ID NO. 1-3. According to a method disclosed by the invention,the contents of the alpha-lactalbumin, the beta-lactoglobulin and the lactoferrin can be simultaneously detected quickly and accurately; the method is high in sensitivity, short in detection time andsimple and easy to operate.