Supercharge Your Innovation With Domain-Expert AI Agents!

Method for detecting content of sulfate in citric acid sample

A sulfate and citric acid technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of large detection deviation, little production guidance, and inability to detect sulfate content data, etc., to achieve the effect of convenient operation and fast detection.

Pending Publication Date: 2021-06-08
COFCO BIOTECHNOLOGY CO LTD
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the visual turbidimetric method is easily affected by personal senses, the detection deviation is large, and the specific content data of sulfate cannot be detected, which has little significance for production guidance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for detecting content of sulfate in citric acid sample
  • Method for detecting content of sulfate in citric acid sample
  • Method for detecting content of sulfate in citric acid sample

Examples

Experimental program
Comparison scheme
Effect test

preparation example

[0028] 1) Preparation of reagents

[0029] Sulfate standard solution (0.1mg / mL): Prepared according to GB / T602-2002 (Preparation of standard solutions for the determination of impurities in chemical reagents).

[0030] Stabilizer solution: Glycerin-ethanol mixture (the volume ratio of the two is 1:2): Prepared according to GB1897-2008 (food additive hydrochloric acid).

[0031] Barium chloride solution (250g / L): Weigh 25g of barium chloride, dissolve in water, transfer to a 100mL volumetric flask, add water to make up to the mark.

[0032] Hydrochloric acid solution (3mol / L): Prepared according to GB / T601-2016 (Preparation of Standard Titration Solutions of Chemical Reagents).

[0033] Distilled water: Prepared according to GB / T601-2016-2016 (Preparation of Chemical Reagent Standard Titration Solutions).

Embodiment 1

[0035] This example is used to illustrate the method reproducibility and accuracy of the present invention.

[0036] (1) Move into sulfate standard solution (0.1mg / mL) in six 50ml colorimetric tubes with stoppers respectively; 1mL, 1.5mL, 2.0mL, 2.5mL, the corresponding sulfate mass is 0mg, 0.05mg, 0.10mg, 0.15mg, 0.20mg, 0.25mg;

[0037] (2) Add water to 6 stoppered colorimetric tubes to 15ml, then add 1mL hydrochloric acid solution, 2.5mL stabilizer solution, 1mL barium chloride solution, shake well, dilute to the mark with water to 25mL, 6 stoppered colorimetric tubes The sulfate content in the color tube is 0mg / mL, 0.002mg / mL, 0.004mg / mL, 0.006mg / mL, 0.008mg / mL, 0.01mg / mL, after shaking well, place it in a water bath at 36℃, keep warm 10min;

[0038](3) Detect the absorbance at a wavelength of 420nm, and calibrate the zero point with the absorbance of the blank solution (the standard solution to be tested with a sulfate radical content of 0 mg / mL). See Table 1 below;

...

Embodiment 2

[0045] This example is used to illustrate the application of the method of the present invention in the detection of sulfate content in citric acid samples.

[0046] Carry out experiment according to the method for the step (5)-(7) of embodiment 1, difference is, in step (5), put into the citric acid sample of different batches (known Sulfate standard content in the citric acid sample), use the standard curve that embodiment 1 draws and the linear regression equation that obtains to calculate the content of sulfate in the sample test solution.

[0047] The results are shown in Table 3 below.

[0048] Table 1

[0049] Numbering Sulfate standard solution (mL) Sulfate content (mg / mL) Absorbance (A) 1 0 0 0 2 0.5 0.002 0.053 3 1.0 0.004 0.105 4 1.5 0.006 0.148 5 2.0 0.008 0.198 6 2.5 0.01 0.255

[0050] Y=0.0399X-0.00005, R 2 =0.9988, formula (1);

[0051] Wherein, Y is sulfate radical content;

[0052] X is absorb...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the field of citric acid detection, and discloses a method for detecting the content of sulfate in citric acid. The method comprises the following steps: 1) preparing a sulfate standard solution; 2) mixing the sulfate standard solution with a water-soluble barium source to prepare a plurality of to-be-detected standard solutions with different sulfate radical contents, and mixing a citric acid sample to be detected with the water-soluble barium source to prepare a to-be-detected sample solution; 3) detecting the absorbance of the to-be-detected standard solutions under the wavelength of 400-450 nm by using a spectrophotometer; 4) drawing a standard curve by taking the absorbance as an abscissa and the corresponding sulfate radical content as an ordinate to obtain a linear regression equation; and 5) detecting the absorbance of the to-be-detected solution of the sample under the same wavelength as that in step 3), calculating the content of sulfate radicals in the to-be-detected solution of the sample according to the linear regression equation, and further calculating to obtain the content of sulfate in the to-be-detected citric acid sample. The method is rapid in detection, and an accurate numerical value of the sulfate radical content can be obtained.

Description

technical field [0001] The invention relates to the field of citric acid detection, in particular to a method for detecting sulfate content in citric acid samples. Background technique [0002] Citric acid is used as sour agent, antioxidant synergist and flavoring agent in food processing. Therefore, there are clear requirements for various indicators of citric acid products, and sulfate in citric acid products is an important detection indicators. GB1987-2007 (food additive citric acid) stipulates that the content of sulfate in citric acid monohydrate is ≤0.015%, and the content of sulfate in anhydrous citric acid is ≤0.01%. BP2018) also has restrictions on the sulfate content, and the sulfate content is less than 0.015%. For the detection method of sulfate content in citric acid, all current standards stipulate the use of visual turbidimetry, which is easy to operate and can meet the requirements of national standards for sulfate content in citric acid. However, visual ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 王迪领全红丽孙晶刘素芳刘凤玲
Owner COFCO BIOTECHNOLOGY CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com