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Method for using petunia petal pigment as acid-base indicator

A technology of acid-base indicator and petunia, which is applied in the application field of chemical chromogen, can solve the problems of cumbersome extraction methods, low precision, and wide color range, and achieve rich color changes, easy and fast determination, and color development high precision effect

Inactive Publication Date: 2010-07-28
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the growth of mangrove candela requires a special environment, the materials are not easy to collect, and the extraction method of purple cabbage pigment is too cumbersome, and the color range of the two plant pigment acid-base indicators is too wide, the color change is monotonous, and the accuracy is not high.
Therefore, the application of the two patents is subject to many restrictions

Method used

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  • Method for using petunia petal pigment as acid-base indicator
  • Method for using petunia petal pigment as acid-base indicator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) Take the petunia purple petals, cut them into pieces, grind them thoroughly with a mortar, add methanol solution containing 0.1% hydrochloric acid for leaching for 20 minutes according to the ratio of material to liquid (1:5 (w / v)), and take the purple supernatant stand-by;

[0014] (2) Use HCl, HAC, NH at a concentration of 1mol / L 3 ·H 2 O. Prepare 5 ml of NaOH solutions with a pH of 1 to 14, and add 10 drops to the holes of the white drip plate;

[0015] (3) Take the petunia purple petal pigment solution extracted in (1) with a dropper, add 2 drops respectively to the holes of the white drip plate containing different pH solutions, and observe the color of the solution. It was found that when the pH of the solution was 1-7, the color of the solution gradually changed from deep red to light red; when the pH was 8-10, the color of the solution changed from purple to blue; when the pH was 11-13, the color of the solution was grass green; At pH 14, the solution col...

Embodiment 2

[0018] (1) Take the petunia purple petals, cut them into pieces, grind them thoroughly with a mortar, add methanol solution containing 0.1% hydrochloric acid for leaching for 30 minutes according to the ratio of material to liquid 1:10 (w / v), and take the purple supernatant stand-by;

[0019] (2) Use HCl, HAC, NH at a concentration of 1mol / L 3 ·H 2 O. Prepare 5 ml of NaOH solutions with a pH of 1 to 14, and add 10 drops to the holes of the white drip plate;

[0020] (3) Take the petunia purple petal pigment solution extracted in (1) with a dropper, add 3 drops respectively to the holes of the white drip plate containing different pH solutions, and observe the color of the solution. It was found that when the pH of the solution was 1-7, the color of the solution gradually changed from deep red to light red; when the pH was 8-10, the color of the solution changed from purple to blue; when the pH was 11-13, the color of the solution was grass green; At pH 14, the solution colo...

Embodiment 3

[0023] (1) Take the petunia purple petals, cut them into pieces, grind them thoroughly with a mortar, add methanol solution containing 0.1% hydrochloric acid for leaching for 30 minutes according to the ratio of solid to liquid 1:5 (w / v), and take the purple supernatant stand-by;

[0024] (2) Use HCl, HAC, NH at a concentration of 1mol / L 3 ·H 2 O. Prepare 5 ml of NaOH solutions with a pH of 1 to 14, and add 10 drops to the holes of the white drip plate;

[0025] (3) Take the petunia purple petal pigment solution extracted in (1) with a dropper, add 2 drops respectively to the holes of the white drip plate containing different pH solutions, and observe the color of the solution. It was found that when the pH of the solution was 1-7, the color of the solution gradually changed from deep red to light red; when the pH was 8-10, the color of the solution changed from purple to blue; when the pH was 11-13, the color of the solution was grass green; At pH 14, the solution color wa...

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Abstract

The invention relates to a method for using petunia petal pigment as an acid-base indicator, which comprises the steps of extracting the purple petunia petals with hydrochloric acid methanol solution to obtain pigment solution, then calibrating the color regularity of the petunia petal pigment solution at different pH values by standard solution with the pH of 1-14, and finally adding a few drops of petunia petal pigment solution to the solution to be tested so as to predict the pH range of the solution according to the color condition.

Description

technical field [0001] The invention relates to a method for using plant pigments as an acid-base indicator, and belongs to the technical field of chemical developer applications. Background technique [0002] There have been reports of using plant pigments as acid-base indicators, such as published patent numbers CN1796986 and CN101162219. But the growth of mangrove candela requires a special environment, the materials are not easy to collect, and the extraction method of purple cabbage pigment is too cumbersome, and the color range of the two plant pigment acid-base indicators is too wide, the color change is monotonous, and the accuracy is not high. Therefore, the application of the two patents is subject to many restrictions. Contents of the invention [0003] The purpose of the present invention is to provide a method of using petunia petal pigment as an acid-base indicator. The raw material of this kind of plant pigment indicator is easy to obtain, easy to extract, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/80
Inventor 王长泉
Owner SHANDONG UNIV OF TECH
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