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Method for measuring sodium alginate content

A sodium alginate and determination method technology, applied in the direction of measuring device, color/spectral characteristic measurement, material analysis through optical means, etc., can solve the problems involving many kinds of reagents, long operation time, complicated operation, etc., and achieve the goal of instrument and Fewer types of reagents, high accuracy, and excellent data repeatability

Inactive Publication Date: 2017-09-29
QINGDAO UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Wang Zewen et al. (Wang Zewen et al., the spectrophotometric testing technology of sodium alginate. Analysis and detection, 2009, 35 (5): 149-151) have studied the method that adopts copper reagent chromogenic spectrophotometry to measure sodium alginate content, this The method is determined by an indirect method, which involves many kinds of reagents and complicated operation
Shang Derong et al. (Shang Derong et al. Establishment of Determination Method for Algin in Kelp. Food Science and Technology, 2011, 36(8): 252-254) studied the method for determining the content of algin in kelp by mass method and calcium acetate method. The method has problems such as long operation time, many steps, and impurity interference

Method used

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  • Method for measuring sodium alginate content
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  • Method for measuring sodium alginate content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The assay method of sodium alginate content in ice cream, comprises the steps:

[0064] S1, sample pretreatment

[0065] Take 10g of a certain brand of ice cream containing sodium alginate, add 500ml of deionized water and 5g of solid sodium carbonate to the sample, stir and heat continuously at 80-90°C for 2h, centrifuge at 6000rad / min for 20min, leave Take the supernatant.

[0066] S2, color reaction of supernatant

[0067] Take 5ml of the supernatant and add it into a 25ml volumetric flask, then add 7mL of 12mol / L concentrated hydrochloric acid and 1mL of phloroglucinol color solution into the volumetric flask, shake and shake well, and react in a boiling water bath for 45min to obtain a color The reaction solution.

[0068] S3, detect and calculate sodium alginate content

[0069] Dilute the color reaction solution with cold deionized water, shake it well and let it cool for 5 minutes, measure its absorbance three times at a wavelength of 440nm, take the average...

Embodiment 2

[0071] The assay method of sodium alginate content in tofu comprises the following steps:

[0072] S1, sample pretreatment

[0073] Take 10g of a certain brand of tofu containing sodium alginate, add 500ml of deionized water and 5g of solid sodium carbonate to the sample, stir and heat continuously at 80-90°C for 2h, centrifuge at 6000rad / min for 20min, leave Take the supernatant.

[0074] S2, color reaction of supernatant

[0075] Take 5ml of the supernatant and add it into a 25ml volumetric flask, then add 7mL of 12mol / L concentrated hydrochloric acid and 1mL of phloroglucinol color solution into the volumetric flask, shake and shake well, and react in a boiling water bath for 45min to obtain a color The reaction solution.

[0076] S3, detect and calculate sodium alginate content

[0077] Dilute the color reaction solution with cold deionized water, shake it well and let it cool for 5 minutes, measure its absorbance three times at a wavelength of 440nm, take the average ...

Embodiment 3

[0079] The assay method of sodium alginate content in jelly, comprises the steps:

[0080] S1, sample pretreatment

[0081] Take 10g of a certain brand of jelly containing sodium alginate, add 500ml of deionized water and 5g of solid sodium carbonate to the sample, stir and heat continuously at 80-90°C for 2h, centrifuge at 6000rad / min for 20min, leave Take the supernatant.

[0082] S2, color reaction of supernatant

[0083] Take 5ml of the supernatant and add it to a 25ml volumetric flask, then add 7mL of 12mol / L concentrated hydrochloric acid and 1mL of phloroglucinol color solution into the volumetric flask, shake and shake well, and react in a boiling water bath for 45min to obtain a color The reaction solution.

[0084] S3, detect and calculate sodium alginate content

[0085] Dilute the color reaction solution with cold deionized water, shake it well and let it cool for 5 minutes, measure its absorbance three times at a wavelength of 440nm, take the average value as ...

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Abstract

The invention relates to a method for measuring sodium alginate content. The method comprises the following steps: using a food containing sodium alginate as a sample; adding deionized water and solid sodium carbonate into the sample; stirring, heating and performing centrifugal separation; keeping supernatant; adding concentrated hydrochloric acid into the supernatant; performing a color development reaction under a boiling water bath condition by taking a phloroglucinol solution as a color development solution; then, measuring absorbance under the wavelength of 420 to 460nm; inquiring on a drawn sodium alginate content standard curve to obtain the sodium alginate content of the food sample. The method is used for measuring the sodium alginate content, is easy, convenient and rapid to operate, is suitable for actual work such as laboratory detection, monitoring of product quality in plants and sodium alginate degradation monitoring, and has a popularization value; less instruments and reagents are used, and have higher accuracy and excellent data repeatability.

Description

technical field [0001] The invention belongs to the field of quantitative analysis of sodium alginate solution concentration, and in particular relates to a method for measuring the concentration of sodium alginate solution. Background technique [0002] Sodium alginate, (sodium alginate, referred to as AGS), also known as sodium alginate, its molecular formula is (C 6 h 7 o 6 Na)n, is a macromolecular polysaccharide. Because sodium alginate cannot be digested and absorbed by the human body, and it has the functions of adsorption, water absorption, and gel filtration in the stomach, it can help excrete heavy metal ions in the body, lower blood pressure, lower blood lipids, increase satiety, and strengthen intestinal tract. The role of peristalsis. In the food industry, sodium alginate is often used as a variety of food additives, such as food stabilizers, preservatives, thickeners, etc. [0003] As a good stabilizer, sodium alginate is added to ice cream to reduce ice c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/314
Inventor 高翠丽夏延致李金花薛志欣王展闫雅君
Owner QINGDAO UNIV