Method for simultaneously and rapidly measuring nitrogen and sulfur contents in aquatic products

A technology for rapid determination of aquatic products, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of many factors affecting the accuracy of data, cumbersome detection steps, and long time consumption, so as to make up for the distortion of detection data, fast detection speed, time-sensitive effect

Inactive Publication Date: 2021-12-10
YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current two current detection methods have cumbersome detection steps, many factors that affect the accuracy of data, and take a long time

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for simultaneously and rapidly measuring nitrogen and sulfur contents in aquatic products
  • Method for simultaneously and rapidly measuring nitrogen and sulfur contents in aquatic products
  • Method for simultaneously and rapidly measuring nitrogen and sulfur contents in aquatic products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: the mensuration of nitrogen (N) sulfur (S) in the scallop:

[0038] A method for simultaneous rapid determination of nitrogen and sulfur content in aquatic products, comprising: 1) selected instruments and equipment, 2) preparation of a standard curve, 3) testing steps, 4) instrument conditions used in the experiment, 5) calculation and expression of results ;

[0039] 1) Instruments and equipment: direct sample nitrogen and sulfur tester, thermal conductivity cell detector and high-purity helium and oxygen; direct sample nitrogen and sulfur tester is developed to solve the technical problems of the present invention;

[0040] (1) Direct sampling nitrogen and sulfur tester: equipped with solid sampling system, two-stage purging device, two purification packed columns, one adsorption column, nickel-chromium wire resistance furnace, quartz tube, two gas circuit control systems , tin foil cup; the solid sampling system is connected to 2 purification packed c...

Embodiment 2

[0074] Example 2: Determination of nitrogen (N) and sulfur (S) in fresh and alive prawn meat: the instruments and equipment used are the same as those in Example 1.

[0075] Homogenize the edible part of fresh and live prawns, weigh about 50.0 mg in a tin foil cup, and measure the nitrogen value with a direct sampling nitrogen and sulfur tester; Add national standard material prawn GB10050 (N=13.5%; S=1.0%) 0.9330g and 2.294g and put it in a mortar and grind it evenly. and 32 times of S; respectively take about 50.0 mg of the sample in a tinfoil cup, utilize the instrument and equipment described in Example 1 to measure the value of nitrogen and sulfur; other conditions are the same as those of scallops in Example 1, fresh and alive prawns The determination results of the standard recovery of N and S in meat (see Table 5 and Table 6).

[0076] Table 5. Determination results of N recovery rate in live and fresh prawn meat

[0077]

[0078] Table 6, Determination of S recov...

Embodiment 3

[0081] Embodiment 3: the mensuration of nitrogen (N) sulfur (S) in grilled fish fillets:

[0082] Grilled fish fillets cut into pieces and pulverized in a pulverizer, weighed about 20.0 mg and put it in a tin foil cup, and measured the value of nitrogen and sulfur using the instrument and equipment described in Example 1; Two parts of g, respectively add 0.4167g and 1.4280g of the national standard substance prawn GB10050 (N=13.5%; S=1.0%) and place them in a mortar to grind evenly. N, 7.88 times and 14.76 times of S, respectively weigh about 20.0 mg of the sample in a tin foil cup, utilize the instrument and equipment described in Example 1 to measure the value of nitrogen and sulfur; other conditions are the same as those of scallops, grilled fish The assay results of the standard addition recovery of N and S in the sheet (see Table 7, Table 8).

[0083] Table 7. Determination results of the standard recovery of N in grilled fish fillets

[0084]

[0085] Table 8, the d...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for simultaneously and rapidly measuring nitrogen and sulfur contents in aquatic products, and belongs to the technical field of aquatic product detection, and the method comprises the following steps: 1) selecting instruments and equipment, 2) preparing a standard curve, 3) testing, 4) determining conditions of instruments used for experiments, and 5) calculating and expressing results. According to the method, the aquatic product is combusted and decomposed into gas at 900 DEG C in an oxygen-enriched atmosphere, the gas enters a reduced copper part at the lower part of a combustion tube under the driving of high-purity helium as a carrier gas, sulfur trioxide is converted into sulfur dioxide, nitrogen oxide is converted into nitrogen, water and carbon dioxide in the mixed gas are respectively absorbed through two purification columns, an adsorption column adsorbs sulfur dioxide, and the remaining nitrogen directly enters a thermal conductivity detector to detect the nitrogen content. The sulfur dioxide adsorption column is heated, the desorbed sulfur dioxide is loaded into a thermal conductivity detector by helium, and the content of the desorbed sulfur dioxide is detected. The detection requirements that the nitrogen and the sulfur in the aquatic products do not need to be digested, solid samples can be directly fed and simultaneously measured, and the timeliness is high are met.

Description

technical field [0001] The invention belongs to the technical field of aquatic product detection, and in particular relates to a simultaneous rapid determination method for nitrogen and sulfur content in aquatic products. Background technique [0002] Aquatic products are an important source of high-quality protein for human beings. The current detection method corresponding to the protein content in food is the national standard "GB 5009.5-2016 Food Safety National Standard for the Determination of Protein in Food". This method needs to be concentrated under catalytic heating conditions. Sulfuric acid is pyrolyzed at 420°C, and the ammonia produced combines with sulfuric acid to form ammonium sulfate; alkalized distillation frees ammonia, absorbs it with boric acid and titrates it with standard titration solution of sulfuric acid or hydrochloric acid, calculates the nitrogen content according to the consumption of acid, and then multiplies it by the conversion factor , whic...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/66G01N30/02
CPCG01N30/66G01N30/02Y02A50/20
Inventor 尚德荣宁劲松赵艳芳谷文艳盛晓风丁海燕康绪明
Owner YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap