Method for detecting sulfur dioxide in plant-derived food

A sulfur dioxide, plant-derived technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of dark color and interference measurement, and achieve the effect of reducing environmental pollution

Inactive Publication Date: 2013-07-17
CHINA NAT RICE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These two inspection methods have limitations: respectively use "sodium tetrachloromercury solution" and "lead acetate solution" as the absorption liquid, the former is a highly toxic control substance, and the latter is a harmful heavy metal, and this method is not applicable to deep Color, determination of samples containing hydroquinones, the color of the extract or distillate of such samples is darker, which interferes with the determination

Method used

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  • Method for detecting sulfur dioxide in plant-derived food
  • Method for detecting sulfur dioxide in plant-derived food
  • Method for detecting sulfur dioxide in plant-derived food

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] 1. Instruments and reagents:

[0071] Instrument: UV-3802 spectrophotometer (Unocal Shanghai Instrument Company), flow meter (0.1L min -1 ~1.0L·min -1 ), HP4 ceramic heating plate (German IKA company).

[0072] Reagents: water is distilled water or deionized water, hydrochloric acid solution (1+1); sodium hydroxide solution (weigh 6g sodium hydroxide, dilute with water to 100mL; cyclohexanediaminetetraacetic acid disodium solution (weigh 1.82g1, 2-cyclohexanediaminetetraacetic acid, add 6.5mL of sodium hydroxide solution, dilute to 100mL with water); formaldehyde buffer absorption solution stock solution (weigh 2.04g potassium hydrogen phthalate, dissolve in a small amount of water, add formaldehyde solution 5.5 mL, disodium cyclohexanediaminetetraacetic acid solution 20mL, diluted with water to 100mL); formaldehyde buffer absorption solution (dilute the formaldehyde buffer absorption solution stock solution 100 times with water); 0.05% pararosaniline hydrochloride co...

Embodiment 2

[0080] 1. Sample processing

[0081]Accurately weigh 2g of crushed black fungus and place it in a 250mL flask. Measure 10mL of 1+1 hydrochloric acid solution into the dropping funnel of the device, measure 20mL of 0.05% formaldehyde buffer absorption solution into the absorption bottle and 50mL volumetric flask, connect it to the distillation device, and adjust the nitrogen flow rate to 0.5L / min ~0.6L / min. Add 50 mL of deionized water into the weighed sample flask, immediately put it back into the distillation device, and put the hydrochloric acid solution in the dropping funnel into the flask. Adjust the temperature of the temperature-controlled ceramic electric heating plate to 500°C, boil the contents in the flask, and keep boiling for about 30 minutes. Remove the absorption bottle, transfer the absorption solution into a volumetric flask, rinse with formaldehyde buffer absorption solution, and make up to volume. At the same time, do a blank experiment.

[0082] 2. Samp...

Embodiment 3

[0085] 1. Sample processing

[0086] Accurately weigh 0.2 g of crushed lily and place it in a 250 mL flask. Measure 10mL of 1+1 hydrochloric acid solution into the dropping funnel of the device, measure 20mL of 0.05% formaldehyde buffer absorption solution into the absorption bottle and 50mL volumetric flask, connect it to the distillation device, and adjust the nitrogen flow rate to 0.5L / min ~0.6L / min. Add 50 mL of deionized water into the weighed sample flask, immediately put it back into the distillation device, and put the hydrochloric acid solution in the dropping funnel into the flask. Adjust the temperature of the temperature-controlled ceramic electric heating plate to 500°C, boil the contents in the flask, and keep boiling for about 30 minutes. Remove the absorption bottle, transfer the absorption solution into a volumetric flask, rinse with formaldehyde buffer absorption solution, and make up to volume. At the same time, do a blank experiment.

[0087] 2. Sample ...

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Abstract

The invention relates to a detection method, in particular to a method for detecting sulfur dioxide in plant-derived food, and belongs to the technical field of food detection. The method provided by the invention comprises steps of: using plant-derived food as a test material; crushing the raw material, and adding hydrochloric acid for nitrogen filling distillation, so as to release of sulfur dioxide, which is then adsorbed by a formaldehyde solution; adding sodium hydroxide and Pararosaniline hydrochloride to form a amaranth complex; determining absorbance value at a wavelength of 577nm; and calculating the content of sulfur dioxide of the plant-derived food according to the absorbance value. The plant-derived food comprises grains, beans, nuts, edible fungus, fruits, vegetables and products thereof. The method replaces a poisonous reagent of a sodium tetrachloromercurate absorption liquid or a heavy metal pollution reagent of a lead acetate absorption liquid with the formaldehyde absorption solution, and can reduce the environmental pollution and damage to the testing personnel. The absorption liquid of the sample in the invention is colorless and transparent, has no interference on the determination of colored sample, and is suitable for detection of all kinds of plant-derived food.

Description

technical field [0001] The invention relates to a detection method, in particular to a method for detecting sulfur dioxide in plant-derived food, and belongs to the technical field of food detection. Background technique [0002] Sulfur dioxide, sulfite, low sulfite, pyrosulfite and sulfur are used as food additives in food production. It is mainly used as bleaching, antiseptic, anti-oxidation and dough improver by using their reducing properties, and is mostly used in dried bamboo shoots, dried vegetables, dried fruits, mushrooms, rice products, biscuits, sugar, candied fruit, canned food, vermicelli, fruit and vegetable juice, etc. Agricultural products and products. The country has strict regulations on the maximum dosage of it (GB2760-2011). When the sulfur dioxide content exceeds a certain standard, it is detrimental to human health. They have a passivating effect on vitamins, and their harm to humans is manifested as bone marrow atrophy and multiple neuritis. Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 段彬伍方长云何小嫣孙成效陈能郭望模朱智伟
Owner CHINA NAT RICE RES INST
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