CN101162219A - Pigment from mangrove kenaelia candel ph indicator - Google Patents
Pigment from mangrove kenaelia candel ph indicator Download PDFInfo
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- CN101162219A CN101162219A CNA2006101226960A CN200610122696A CN101162219A CN 101162219 A CN101162219 A CN 101162219A CN A2006101226960 A CNA2006101226960 A CN A2006101226960A CN 200610122696 A CN200610122696 A CN 200610122696A CN 101162219 A CN101162219 A CN 101162219A
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- mangrove
- kenaelia
- candel
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Abstract
The invention provides a mangrove kenaelia candel pigment acid-base indicator, the main technical points of which are that the mangrove kenaelia candel pigment is pulverescent water color; the color of the mangrove kenaelia candel pigment is influenced by acidity, that is, colors appear different within different ranges of acidity, for example, stable yellow appears when PH is between 1 and 7, stable red appears when PH is less than or equal to 1 or more than or equal to 8, thereby the mangrove kenaelia candel pigment can be taken as the acid-base indicator for indicating the titration end-point in the titration of mutual titration between strong acid strong base sodium hydroxide and hydrochloric acid, the transition interval is that PH is between 7.2 and 8.3. When the mangrove kenaelia candel pigment is used for the sodium hydroxide to titrate the hydrochloric acid, the color of the end-point changes from yellow to red, and the titration result can compete with that of using phenolphthalein. When the mangrove kenaelia candel pigment is used for the hydrochloric acid to titrate the hydrochloric acid, the color of the end-point changes from red to yellow, and the acute degree of the color change of the end-point is far beyond the effect of using helianthine as the indicator with easy observation, small error of the end-point, accurate determination result, and the mangrove kenaelia candel pigment can substitute the helianthine when the hydrochloric acid titrates the hydrochloric acid. As a pure natural product, the mangrove kenaelia candel pigment acid-base indicator is safe for users, does not pollute environment and is beyond comparison by a chemical agent. The mangrove kenaelia candel pigment acid-base indicator is a water-solubility indicator, has good stability for light and heat, strong oxidation resistance and reductibility resistance, convenient use, simple preparation technology and low cost.
Description
Technical field
The pigment from mangrove kenaelia candel ph indicator that the present invention relates to belongs to the chemical reagent class.
Background technology
The feature of acid base indicator is that in the acid base titration process, with the variation of solution acidity, its structure changes, thereby causes change in color.Indicator commonly used in the acid base titration has phenolphthalein, methyl orange and methyl red.During with NaOH titration hydrochloric acid, make indicator with phenolphthalein, the color change interval of phenolphthalein is pH8～10, titration to solution by colourless appearance little red be terminal point, the change color of this terminal point is more easily observed.The color change interval of methyl orange is pH3.1～4.4, and change color is red → orange → Huang.During with salt acidometric titration NaOH, make indicator with methyl orange, color becomes the orange terminal point that is by yellow.But orange and yellow are very approaching, and solution is become by yellow and is difficult for observing when orange, therefore, causes bigger end point error easily.Discover that extract the gained mangrove kenaelia candel pigment by the mangrove kenaelia candel leaf, its color is relevant with acidity, is stable yellow in pH1～7 acidity scopes, is stable redness in pH≤1 and pH 〉=8 scopes, and color changes with acidity sharp, reversible.When using it in the NaOH titration hydrochloric acid directing terminal, its titration results be that indicator is compared with phenolphthalein, by consuming volume of titrant, error is less than ± 0.02mL.Especially outstanding is, when being used for salt acidometric titration NaOH with it as indicator, terminal colour becomes vivid yellow by vivid redness, and the sharp degree of its change color is considerably beyond the change color of making indicator with methyl orange, and terminal point is very easily observed.Therefore, this mangrove kenaelia candel pigment as acid base indicator, is used in acid base titration, end point error is little, and measurement result is accurate, for titration brings convenience.And this pigment indicator is the pure natural product, not only to user's safety, more can any pollution do not arranged to environment, has the advantage that chemical reagent is not taken charge of analogy.This pigment from mangrove kenaelia candel ph indicator is a water colo(u)r, and light, heat are had good stable, and resistance to oxidation and reducing resistance can be strong, easy to use; Preparation technology is simple, and cost is low, is the initiative technical research that plant pigment is used in the chemical reagent field.
Summary of the invention
The invention provides a kind of pigment from mangrove kenaelia candel ph indicator, its main technical points is that mangrove kenaelia candel pigment is the powdery, water-soluble pigment, and its change color is subjected to the influence of acidity, is different colours in the different acidity scope.Be stable yellow in pH1～7 acidity scopes, be stable redness in pH≤1 and pH 〉=8 scopes, can be used as acid base indicator and be used for the titration that NaOH and hydrochloric acid drips mutually and indicate titration end-point, its color change interval is pH7.2～8.3.When being used for NaOH titration hydrochloric acid, terminal colour is changed to by yellow and becomes redness, and titration results can compare favourably with the result who uses phenolphthalein.When being used for salt acidometric titration NaOH, terminal colour is changed to by vivid redness and becomes vivid yellow, and terminal colour changes sharp degree considerably beyond the effect of making indicator with methyl orange, the use of alternative methyl orange in salt acidometric titration NaOH.
The preparation technology of pigment from mangrove kenaelia candel ph indicator is:
The autumn eggplant that is the island mangrove area with the Zhan Jiangte of Guangdong Province is a raw material, the mangrove kenaelia candel leaf is cleaned, airing, pulverize, it is an amount of that mangrove kenaelia candel leaf after the pulverizing and 0.9% hydrochloric acid add hydrochloric acid by 1: 20 (w/v), soak 4h in 50 ℃ of following water bath with thermostatic control reflux, filter yellow filtrate, the filter residue that obtains soaks 2h again with 0.9% hydrochloric acid solution again under the same terms, filter, merge filtrate twice, it is about 35% that filtrate vacuum under 50 ± 5 ℃ of conditions is concentrated into soluble solids, adopts centrifugal spray drying method drying then, during centrifugal spray drying, the drying tower EAT is controlled at 175 ℃, and leaving air temp is controlled at 85 ℃, can finish about about 3～4s.Obtain the mangrove kenaelia candel pigment powder of pale brown look, yield is about between 25%～30%.
The present invention has following outstanding feature: the color of pigment from mangrove kenaelia candel ph indicator changes with acidity, and color changes sharp, reversible with acidity; When being used for salt acidometric titration NaOH, becoming yellow by redness is terminal point, and terminal colour changes sharp degree considerably beyond the effect of making indicator with methyl orange, very easily observe, end point error is little, and measurement result is accurate, the use of alternative methyl orange in salt acidometric titration NaOH; Pigment from mangrove kenaelia candel ph indicator is the pure natural product, not only to user's safety, more can any pollution not arranged to environment, and chemical reagent is incomparable; This pigment from mangrove kenaelia candel ph indicator is water-soluble indicator, and light, heat are had good stable, and resistance to oxidation and reducing resistance can be strong, easy to use; Preparation technology is simple, and cost is low.
Operation technique of the present invention is as follows:
Get the mangrove kenaelia candel pigment powder 0.5g that makes by above-mentioned preparation technology and be dissolved in the 100mL distilled water, get its 2～3 and drip in titrated NaOH or hydrochloric acid solution and get final product.
Claims (2)
1. pigment from mangrove kenaelia candel ph indicator proterties: powder is water-soluble.
2. pigment from mangrove kenaelia candel ph indicator according to claim 1 is characterized in that, the color of pigment from mangrove kenaelia candel ph indicator is subjected to the influence of acidity, is different colours in the different acidity scope.In pH1～7 acidity scopes, be stable yellow, in pH≤1 and pH 〉=8 scopes, be stable redness.Be used for NaOH titration hydrochloric acid, terminal colour is changed to by yellow and becomes redness; Be used for salt acidometric titration NaOH, terminal colour is changed to by redness and becomes yellow.Color change interval is pH7.2～8.3.Terminal colour changes sharp degree considerably beyond the effect of making indicator with methyl orange, the use of alternative methyl orange in salt acidometric titration NaOH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101226960A CN101162219A (en) | 2006-10-13 | 2006-10-13 | Pigment from mangrove kenaelia candel ph indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101226960A CN101162219A (en) | 2006-10-13 | 2006-10-13 | Pigment from mangrove kenaelia candel ph indicator |
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| CN101162219A true CN101162219A (en) | 2008-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2006101226960A Pending CN101162219A (en) | 2006-10-13 | 2006-10-13 | Pigment from mangrove kenaelia candel ph indicator |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788496A (en) * | 2010-03-09 | 2010-07-28 | 山东理工大学 | Method for using petunia petal pigment as acid-base indicator |
| CN102213679A (en) * | 2011-04-15 | 2011-10-12 | 盐城纺织职业技术学院 | Rainflower fruit pigment neutralization indicator preparation method |
| CN104458740A (en) * | 2014-11-24 | 2015-03-25 | 苏州东辰林达检测技术有限公司 | Preparation method for carrot pigment acid-base detection indicator |
| CN104880461A (en) * | 2015-06-22 | 2015-09-02 | 王迪 | Acid-base indicator based on natural plant pigment and preparation method thereof |
| CN107827850A (en) * | 2017-11-17 | 2018-03-23 | 山西大学 | A kind of acid-base indicator and its preparation method and application |
| CN110243821A (en) * | 2019-05-21 | 2019-09-17 | 天津科技大学 | Amur honeysuckle fruit pigment acid-base indicator and preparation method thereof |
-
2006
- 2006-10-13 CN CNA2006101226960A patent/CN101162219A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788496A (en) * | 2010-03-09 | 2010-07-28 | 山东理工大学 | Method for using petunia petal pigment as acid-base indicator |
| CN102213679A (en) * | 2011-04-15 | 2011-10-12 | 盐城纺织职业技术学院 | Rainflower fruit pigment neutralization indicator preparation method |
| CN104458740A (en) * | 2014-11-24 | 2015-03-25 | 苏州东辰林达检测技术有限公司 | Preparation method for carrot pigment acid-base detection indicator |
| CN104880461A (en) * | 2015-06-22 | 2015-09-02 | 王迪 | Acid-base indicator based on natural plant pigment and preparation method thereof |
| CN107827850A (en) * | 2017-11-17 | 2018-03-23 | 山西大学 | A kind of acid-base indicator and its preparation method and application |
| CN107827850B (en) * | 2017-11-17 | 2021-03-30 | 山西大学 | Acid-base indicator and preparation method and application thereof |
| CN110243821A (en) * | 2019-05-21 | 2019-09-17 | 天津科技大学 | Amur honeysuckle fruit pigment acid-base indicator and preparation method thereof |
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Open date: 20080416 |