A nano-sized color-sensitive sensor and its method for discriminating the mildew degree of wheat

A color-sensitive sensor and nanotechnology, which is used in material analysis, instruments, scientific instruments and other directions by observing the effect on chemical indicators, can solve the problems of non-specific vapor results of volatiles and other problems, and achieve good color-sensitive characteristics, The effect of increasing the color rendering effect and improving the sensitivity

Active Publication Date: 2022-01-11
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has special limitations of baseline drift, non-specificity for volatiles, and effects of vapor results

Method used

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  • A nano-sized color-sensitive sensor and its method for discriminating the mildew degree of wheat
  • A nano-sized color-sensitive sensor and its method for discriminating the mildew degree of wheat
  • A nano-sized color-sensitive sensor and its method for discriminating the mildew degree of wheat

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1: Screening of wheat mildew characteristic gas and color-sensitive materials sensitive to it

[0044] S1. Analysis of volatile gases in the process of wheat mildew

[0045] (1) Cultivate the wheat in the constant temperature and humidity chamber with the best mildew condition, take the wheat sample in the extraction bottle with a balance and add 4-methyl-2-pentanol as an internal standard, and tighten the lid; then Heat the extraction bottle in a constant temperature water bath, insert the SPME extraction head from the rubber pad of the bottle cap into the headspace of the sample, push out the fiber head, and absorb in the headspace;

[0046] The optimal conditions for the mildew are 28°C and 80% humidity;

[0047] The amount of the sample and 4-methyl-2-pentanol is 8.0 g: 10 μL, wherein the concentration of 4-methyl-2-pentanol is 1.212 mg / L;

[0048] The water bath heating condition is 75°C;

[0049] The headspace was adsorbed for 40 minutes.

[0050] (2) ...

Embodiment 2

[0060] Embodiment 2: the synthesis of nano-color sensitive material

[0061] (1) Using styrene (St) and acrylic acid (AA) as monomers, ammonium persulfate (APS) as an initiator in a non-buffered medium, polystyrene-acrylic acid (P(St -co-AA)).

[0062] The specific preparation method is as follows: add 40 mL of deionized water into a 100 mL glass reaction vessel. Then it was heated to 70° C. in a constant temperature magnetic stirring water bath. After stirring at 400 rpm and purging with nitrogen for about 1 hour, 5.25 g of St and 0.18 g of AA monomer were added to the reaction vessel, and the reaction was started by adding 10 mL of a 10 g / L aqueous solution of APS. The system was controlled at 70 ° C and maintained for 8 Hour. After the reaction was completed, 0.1 mol / L HCl solution was added and centrifuged at 12,000 rpm for 30 minutes, and finally washed three times with deionized water to remove residual monomers, electrolytes and water-soluble oligomers. Finally, the...

Embodiment 3

[0067] Embodiment 3: P (St-co-AA) nanosphere and the influence of different mass ratios of color-sensitive materials on material properties

[0068] P(St-co-AA)-NO 2 As a single array unit, BDP is made into a set of color-sensitive sensors to detect 1-octen-3-ol, and the response difference of each sensor array to 1-octen-3-ol is shown in Table 2 below.

[0069] By comparison, it was found that P(St-co-AA)-NO 2 When BDP captures 1-octen-3-ol molecules, its RGB response values ​​are significantly higher than other materials.

[0070] Table 2. Different mass ratios (NO 2 BDP / PSA) and 1-octen-3-ol reaction response value mean, standard deviation and coefficient of variation

[0071]

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Abstract

The invention relates to a nano-color sensitive sensor and a method for discriminating the mildew degree of wheat, and belongs to the field of grain and oil raw material quality control; the invention firstly synthesizes polystyrene-acrylic acid nano-microspheres; Gas-sensitive color-sensitive material and adding dichloromethane solution, and then adding emulsifier polyethylene glycol 600 under magnetic stirring; preparing nano-sized color-sensitive material; and using the nano-sized color-sensitive material to measure the degree of mildew in wheat To detect, compare the pattern recognition results of non-nanometerized and nanometerized color-sensitive sensors to detect wheat mildew at the same time, determine the potential of nanometerized sensors in detecting volatile gases of wheat mildew, and complete the discrimination of wheat with different degrees of mildew; It has important practical significance in meeting consumers' food quality and safety needs and maintaining market order.

Description

technical field [0001] The invention relates to a nano-sized color-sensitive sensor and a method for discriminating the mildew degree of wheat, belonging to the field of grain and oil raw material quality control. Background technique [0002] Among China's grain reserves, wheat reserves rank first. Wheat is easily infected by mold during storage and transportation, causing deterioration and thus affecting its quality and safety. There are various types of molds on grain, and the genus Aspergillus and Penicillium are the most common flora. When a small amount of local moisture rises, the conditions for the growth of these dry molds such as Aspergillus baulardii will first be met, and these molds will grow first. . [0003] In view of the above drawbacks, electronic noses have also been used to identify gas mixtures to overcome this constraint. It has been used as a rapid detection of food variety, quality, insect damage, freshness and mildew degree and other related field...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
CPCG01N21/783G01N2021/7756
Inventor 林颢康文翠陈全胜严松
Owner JIANGSU UNIV
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