Manufacturing method of food odor visible sensor based on natural pigment

Abstract

The invention discloses a manufacturing method of a food odor visible sensor based on natural pigment. The manufacturing method comprises the steps of: respectively adding 50-95% alcohol solution or 3-7% of citric acid solvent to black rice, azalea, peach flower and purple sweet potato raw materials, soaking in a 60-80 DEG C water bath pan, after obvious fading, filtering and concentrating to obtain four pigment concentrated solutions with water contents of 60-80%, adjusting the pH values of the four pigment solutions to 4, 5, 6, 7, 8 and 10 with water, 0.5-5% citric acid solution and 3-10% sodium bicarbonate solution respectively, detecting with a color difference meter and analyzing the color difference of each pigment under the conditions of different pH values by an LAB color space method, selecting the pigment with obvious AB value changes under the weak acid, neutral and weak basic conditions as a gas sensitive material, finally fixing the gas sensitive material to a substrate flat material, and drying to obtain a visible sensor array. According to the invention, the natural pigment is used as the gas sensitive material, thereby being nontoxic and harmless as well as eliminating the harm to human health.

Description

technical field [0001] The invention relates to a manufacturing method of an odor visualization sensor, in particular to a manufacturing method of a food odor visualization sensor using natural pigments as gas-sensitive materials. Background technique [0002] Food odor is an important indicator for judging food quality and freshness. Since most food odors are colorless and invisible to the naked eye and are not easy to collect, it is difficult to conduct qualitative and quantitative analysis. Food odors are usually acidic and volatile, so these two properties can be used to make odor visualization sensors. The currently available odor visualization sensors perform qualitative and quantitative analysis of the gas to be detected based on the color change before and after the reaction between a specific gas-sensitive material and the gas to be detected. The gas-sensitive materials in the patent No. ZL200710024695.7, titled "Manufacturing Method of Color Sensitive Gas Sensor A...

AI Technical Summary

Problems solved by technology

The gas-sensitive materials in the patent No. ZL200710024695.7, titled "Manufacturing Method of Color Sensitive Gas Sensor Array" are generally porphyrin compounds and hydrophobic pH indicators. Although these gas-sensitive materials have high sensitivity, However, due to its chemical toxicity, it is not suitable for direct use in food analysis, let alone in contact with food.

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