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Method and detecting tube for visually detecting meat freshness based on gold nanoparticle material

A technology of gold nanometer and freshness, which is applied in the direction of analyzing materials through chemical reactions and observing the influence of chemical indicators, etc. It can solve the problems of narrow chromaticity changes, unfavorable application and promotion, and poor material stability. and other problems, to achieve the effect of easy operation, rich color changes, easy to carry and store

Active Publication Date: 2015-12-30
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above invention patents are all based on the traditional pH detection principle. The purpose of predicting the freshness of food is achieved through the color change of traditional indicators such as bromothymol blue, methyl red, bromophenol red, bromocresol purple, etc., but the chromaticity change is narrow , poor material stability
There are also some invention patents that provide specialized measuring instruments, such as a method for identifying and predicting the freshness of meat (CN102297930A), a method for quickly detecting the freshness of hairtail with near-infrared spectroscopy (CN103424374), a rapid and sensitive detection method Meat freshness method (CN104458888A), freshwater fish freshness ultrasonic detector and detection method (CN103983693A), a fish fillet freshness detection method based on hyperspectral imaging (CN103439285A), but these methods all require special instruments , the detection is realized by specialized personnel and professional operation skills, which is not conducive to wide application and promotion

Method used

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  • Method and detecting tube for visually detecting meat freshness based on gold nanoparticle material
  • Method and detecting tube for visually detecting meat freshness based on gold nanoparticle material
  • Method and detecting tube for visually detecting meat freshness based on gold nanoparticle material

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preparation example Construction

[0031] The preparation method of described gold nanorod comprises the steps:

[0032] 1) Synthesis of seed crystals: react chloroauric acid and sodium borohydride solution in the presence of hexadecyltrimethylammonium bromide for 30 seconds, then sink at 30°C for 1 hour to obtain seed crystals;

[0033] 2) Synthesis of gold nanorods: In the presence of cetyltrimethylammonium bromide, mix chloroauric acid, silver nitrate, hydrochloric acid, and ascorbic acid, then add the seed crystals prepared in step 1) and keep away from light After standing overnight and centrifuging, the resulting precipitate was redispersed in cetyltrimethylammonium bromide solution to obtain a gold nanorod solution.

[0034] In step 1), the mol ratio of chloroauric acid to sodium borohydride solution is 1:1-10;

[0035] In step 2), the molar ratio of chloroauric acid, silver nitrate solution, hydrochloric acid and ascorbic acid is 5:1:200:8; the volume range of seed crystals used per 2 mmol of hydrochlo...

Embodiment 1

[0050] Synthesis of gold nanorods:

[0051] 1) Synthesis of seed crystals: In 9.75mL of cetyltrimethylammonium bromide (0.10mol / L), add 0.25mL of chloroauric acid (9.71mmol / L), and then add 0.3mL of sodium borohydride solution ( 0.01mol / L), after stirring for 30s, settling at 30°C for 1h to obtain dark brown seed crystals;

[0052] 2) Synthesis of gold nanorods: In 100mL cetyltrimethylammonium bromide (0.10mol / L), add 5.15mL chloroauric acid (9.7mmol / L), 0.1mL silver nitrate solution (0.10mol / L) L), 2mL of hydrochloric acid solution (1.00mol / L), 0.8mL of ascorbic acid (0.10mol / L), mixed well, added 0.5mL seed crystals, kept in the dark overnight and then centrifuged (12000rpm, 20min), the resulting precipitate was redispersed in In 150.00mL cetyltrimethylammonium bromide solution (33.00mmol / L), a gold nanorod solution was obtained.

Embodiment 2

[0054] Synthesis of gold nanorods:

[0055] 1) Synthesis of seed crystals: In 9.75mL of cetyltrimethylammonium bromide (0.10mol / L), add 0.25mL of chloroauric acid (9.71mmol / L), and then add 1.2mL of sodium borohydride solution ( 0.02mol / L), after stirring for 30s, settling at 30°C for 1h to obtain tea-brown seed crystals;

[0056] 2) Synthesis of gold nanorods: In 100mL of cetyltrimethylammonium bromide (0.10mol / L), add 5.15mL of chloroauric acid (9.71mmol / L), 0.1mL of silver nitrate solution (0.10mol / L) L), 2mL of hydrochloric acid solution (1.00mol / L), 0.8mL of ascorbic acid (0.10mol / L), mixed well, added 0.5mL seed crystals, kept in the dark overnight and then centrifuged (12000rpm, 20min), the resulting precipitate was redispersed in In 150.00mL cetyltrimethylammonium bromide solution (33.00mmol / L), a gold nanorod solution was obtained.

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Abstract

The invention discloses a method for visually detecting meat freshness based on a gold nanoparticle material. According to the method, different biogenic amines released by the meat in different freshness can hydrolyze a reducing agent precursor and generate different reducible matters, so that the visible detection for the meat freshness can be realized by inducing the chromogenic reaction between the reducible matters and the gold nanoparticle material under the condition of the existence of silver ion. Besides, the invention also provides a detecting tube for visually detecting the meat freshness. The detecting tube comprises a transparent tube body and a transparent tube cover connected with the transparent tube body; a gel is arranged in the transparent tube cover; the gold nanoparticle material, the reducing agent precursor and the silver nitrate are contained in the gel. The detecting tube can be used for performing the conventional quick test on the meat freshness or real-time indicating the freshness of the meat within the shelf life. The method and the detecting tube provided by the invention can be used for realizing the quick, accurate and real-time detection for the meat freshness; the detection cost is low; the operation is simple and convenient; the detecting tube can be conveniently carried and stored.

Description

technical field [0001] The invention belongs to the technical field of meat product detection, and in particular relates to a method for visually detecting the freshness of meat based on gold nanomaterials and a detection tube thereof. Background technique [0002] The spoilage of meat is usually caused by contamination by external microorganisms and the action of enzymes in the process of slaughtering, processing and distribution. Rotten meat not only undergoes serious changes in sensory properties, color, elasticity, smell, etc., but also destroys the nutritional content of the meat. At the same time, due to the production of toxic substances due to the metabolism of microbial life, eating spoiled meat will cause food poisoning. From the perspective of protecting human health and economic and environmental protection, it is of great significance to provide an instrument for indicating the degree of food corruption for meat production departments and consumers. [0003] Am...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 郭良洽林天然
Owner FUZHOU UNIV
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