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Chitosan-purple sweet potato pigment pH test paper and preparation method thereof

A technology of purple sweet potato pigment and chitosan, which is applied in the direction of analyzing materials through chemical reactions and observing the influence of chemical indicators on materials, etc. It can solve the problems that the application of pH test paper is not popular enough, and meet the equipment requirements Low cost, high safety, and simple production process

Inactive Publication Date: 2018-12-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of pH test paper prepared by extracting indicators from safe and low-cost natural raw materials is not popular enough

Method used

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  • Chitosan-purple sweet potato pigment pH test paper and preparation method thereof
  • Chitosan-purple sweet potato pigment pH test paper and preparation method thereof
  • Chitosan-purple sweet potato pigment pH test paper and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Extraction of purple potato pigment:

[0019] Purple potato powder and acidified ethanol were mixed at a ratio of 1:20 (w / v) and then ultrasonicated to prepare a purple potato pigment solution. The acidified ethanol is prepared by mixing hydrochloric acid and absolute ethanol with a volume ratio of 15:85, and the concentration of hydrochloric acid is 0.5mol / L. The frequency of ultrasound is 10kHz, the power of ultrasound is 20W, the mode of ultrasound is 2s on / 2s off, and the duration of ultrasound is 10min.

[0020] (2) preparation of chitosan-purple sweet potato pigment solution:

[0021] Add the purple potato pigment solution into the chitosan acetic acid solution according to 80mL / L, and stir at 200rpm for 8h; wherein the chitosan acetic acid solution is obtained by adding chitosan into the acetic acid solution according to 20g / L, wherein the volume of the acetic acid solution The concentration is 1%.

[0022] (3) Film injection and drying:

[0023] Inject a...

Embodiment 2

[0025] (1) Extraction of purple potato pigment:

[0026] Purple potato powder and acidified ethanol were mixed at a ratio of 1:100 (w / v) and then ultrasonicated to prepare a purple potato pigment solution. The acidified ethanol is prepared by mixing hydrochloric acid and absolute ethanol with a volume ratio of 15:85, and the concentration of hydrochloric acid is 4mol / L. The frequency of ultrasound is 50kHz, the power of ultrasound is 450W, the mode of ultrasound is 11s on / 4s off, and the duration of ultrasound is 60min.

[0027] (2) preparation of chitosan-purple sweet potato pigment solution:

[0028] Add the purple potato pigment solution into the chitosan acetic acid solution according to 10mL / L, and stir at 4000rpm for 1h; wherein the chitosan acetic acid solution is obtained by adding chitosan into the acetic acid solution according to 5g / L, wherein the volume of the acetic acid solution The concentration is 1%.

[0029] (3) Film injection and drying:

[0030] Inject ...

Embodiment 3

[0032] (1) Extraction of purple potato pigment:

[0033] Purple potato powder and acidified ethanol were mixed at a ratio of 1:100 (w / v) and then ultrasonicated to prepare a purple potato pigment solution. The acidified ethanol is prepared by mixing hydrochloric acid and absolute ethanol with a volume ratio of 15:85, and the concentration of hydrochloric acid is 4mol / L. The frequency of ultrasound is 50kHz, the power of ultrasound is 450W, the mode of ultrasound is 11s on / 4s off, and the duration of ultrasound is 60min.

[0034] (2) Selection of optimal purple sweet potato pigment addition amount:

[0035] Different volumes of purple sweet potato pigment solution and chitosan were prepared into chitosan-purple sweet potato pigment pH test paper, and the tensile force was measured. The measurement results are shown in Table 1. 20mL / L with the strongest stretching force was selected as the optimal amount of purple sweet potato pigment.

[0036] Table 1:

[0037]

[0038]...

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Abstract

The invention discloses chitosan-purple sweet potato pigment pH test paper and a preparation method thereof. The method comprises the following steps that purple sweet potato powder and acidified ethanol are mixed and then are subjected to ultrasonic treatment so as to obtain a purple sweet potato pigment solution, then the purple sweet potato pigment solution is dissolved in a chitosan-acetic acid solution, and stirring, film injection and drying are carried out so as to obtain the pH test paper. According to the pH test paper and the preparation method thereof, the pH test paper is preparedby utilizing the good film-forming property of chitosan and the change of the main configuration of purple sweet potato pigment in different pH solution environments; and common food materials are adopted as raw materials, a preparation process is simple, the requirement for equipment is low, the pH indication range is wide, the safety is high, and the pH test paper is very suitable for real-timemonitoring of product quality indexes related to the pH value in the field of food.

Description

technical field [0001] The invention relates to a preparation method of a pH test paper, in particular to a chitosan-purple sweet potato pigment pH test paper and a preparation method thereof. Background technique [0002] The measurement of pH is widely used in various aspects, especially in the field of food, where the quality of food is often closely related to pH changes. Therefore, it is of great significance to establish a fast, safe and nondestructive pH indication method for food safety monitoring. At present, the commonly used pH detection methods mainly include the use of pH meter and pH test paper. The pH meter reads quickly and accurately, but most of the pH meters are only suitable for liquid detection, and have certain limitations for the detection of solid pH. And the pH meter is not widely used in people's daily life, and the popularity outside the laboratory is not high. At present, the main color components of widely used pH test paper include methyl red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/80
CPCG01N21/80
Inventor 胡亚芹李苑吴春华应宇斌陈士国丁甜陈健初刘东红
Owner ZHEJIANG UNIV
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