Optical spectrum rapid nondestructive detection method of fruit and vegetable vitamin C content

Abstract

The invention relates to a spectrum rapid nondestructive testing method for testing the content of vitamin C in fruit and vegetable, which relates to a rapid nondestructive testing method for testing the content of vitamin C in fruit and vegetable through utilizing visible light and a near infrared diffuse reflectance spectroscopy analytic technique. The testing method which is adopted at present has the disadvantages of destructive test, slow testing speed, low efficiency and high production cost. The technical proposal which is provided by the spectrum rapid nondestructive testing method specifically comprises gathering samples, gathering and selecting modeling samples, gathering the spectrum of modeling samples, measuring the reference chemical value of modeling samples, correcting mathematical model building, correcting mathematical model proof, and predicting unknown samples. The spectrum rapid nondestructive testing method is mainly used to rapidly and efficiently achieve the nondestructive inspection of the content of vitamin C in various fruit and vegetable. The invention has the advantages of fast testing speed, high testing precision, little artificial error and low detecting cost, which does not need chemical agent, and does not pollute environment.

Description

technical field [0001] The invention relates to the field of nondestructive testing methods, in particular to a method for rapid nondestructive testing using spectral analysis technology. Background technique [0002] In recent years, with the continuous increase in the output of fruits and vegetables and the continuous improvement of people's living standards, consumers have higher and higher requirements for the internal quality indicators of fruits and vegetables when purchasing fruits and vegetables, and vitamin C is an important nutritional component. , is undoubtedly the main reference index for consumers when choosing fruits and vegetables. At present, the determination of vitamin C in fruits and vegetables is often based on destructive chemical analysis or analysis using expensive laboratory instruments. Common methods for detecting vitamin C in fruits and vegetables mainly include: [0003] 2,6-dichloroindophenol titration: Redox titration of acidic solutions of fr...

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Problems solved by technology

Although the 2,6-dichloroindophenol titration method is the national standard method for the determination of vitamin C content in fruits and vegetables in my country (GB / T6195-1986), the measurement process requires fruit beating, constant volume, filtration, titration, calibration, etc. , the measurement results are greatly affected by human factors, the detection speed is slow, the detection efficiency is low, and expensive chemical reagents need to be purchased, and the detection cost is high

Although the 2,4-dinitrophenylhydrazine method is the national standard method (GB / T12392-1990) for the determination of total ascorbic acid in vegetables, fruits and their products in my country, the measurement process requires fruit beating, constant volume, filtration, water bath, Colorimetry, curve drawing and other processing, the measurement results are greatly affected by human factors, the detection speed is slow, the detection efficiency is low, and expensive chemical reagents need to be purchased, and the detection cost is high

Although high performance liquid chromatography is the national standard method for the determination of various components in food and feed in my country (for example: GB / T 19861-2005: Detection method for Sudan red dye in food; GB / T 17817-1999: Vitamin in feed A), but the measurement process requires beating, constant volume, filtration, chromatographic analysis, etc., and must be equipped with high-performance liquid chromatography, ultraviolet detectors, integrators and other equipment, so this method is complicated to operate and the instruments used are expensive. , the detection cost is high, and the detection cycle is long

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