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Preparation method for carrot pigment acid-base detection indicator

A technology for the detection of carrot pigment and acid-base, which is applied in the direction of material analysis by observing the influence on chemical indicators, and analysis by making materials undergo chemical reactions. It can solve the problem that the color change of acid-base indicators is not obvious and is not suitable for indication Eliminates problems such as difficult access to reagents and materials, and achieves the effects of easy observation, no environmental pollution, and simple preparation methods

Inactive Publication Date: 2015-03-25
DONGCHEN LEADER TESTING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, reports on using plant pigments as indicators have been made public. For example, Chinese patent application No. 200610122696.0 discloses mangrove candelan pigment acid-base indicator.
As a common herbaceous plant, carrots are easy to obtain, but the known acid-base indicators made from carrots have no obvious color change and poor indicating effect, so they are not suitable for use as indicators.

Method used

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  • Preparation method for carrot pigment acid-base detection indicator

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Embodiment 1

[0016] A method for preparing a carrot pigment acid-base detection indicator, comprising the following steps: (1) After washing and draining fresh carrots, scrape off the purple-red skin and grind them into slurry; (2) grind the above-mentioned carrots into slurry The skin, ethyl acetate and water were mixed and stirred at 300 rpm, heated and refluxed for 40 minutes; (3) The above-mentioned extract mixture was separated to obtain the upper layer of carrot pigment liquid and the lower layer of water layer with solids; (4) The above water layer with solids was operated 3 times according to the method described in step (2) to obtain new carrot pigment solution; (5) the carrot pigment solution in step (3) and step (4) was vacuumed to Stir and mix at 200 rev / min for 30 minutes under the same conditions, heat to 35°C and distill under reduced pressure to dry all the concentrated carrot pigment liquids above; 45°C, 12 hours in a decompression vacuum drying oven, and then grind to obt...

Embodiment 2

[0018] A method for preparing a carrot pigment acid-base detection indicator, comprising the following steps: (1) After washing and draining fresh carrots, scrape off the purple-red skin and grind them into slurry; (2) grind the above-mentioned carrots into slurry The skin, petroleum ether and water were mixed and stirred at 400 rpm, heated and refluxed for 30 minutes; (3) the above-mentioned extract mixture was separated to obtain the upper layer of carrot pigment liquid and the lower layer with solid water layer; (4) the The above-mentioned water layer with solids is operated 3 times according to the method described in step (2) to obtain a new carrot pigment solution; (5) the carrot pigment solution in step (3) and step (4) is vacuumed under the condition of 800Pa Stir and mix at 300 rpm for 40 minutes, heat to 45°C and distill under reduced pressure to dry all the concentrated carrot pigment liquids above; ℃, 24 hours in a reduced-pressure vacuum drying oven, and then grin...

Embodiment 3

[0020] A method for preparing a carrot pigment acid-base detection indicator, comprising the following steps: (1) After washing and draining fresh carrots, scrape off the purple-red skin and grind them into slurry; (2) grind the above-mentioned carrots into slurry The peel, ether and water were uniformly mixed and stirred at 400 rpm, heated and refluxed for 50 minutes; (3) the above-mentioned extract mixture was separated to obtain the upper layer of carrot pigment liquid and the lower layer with solid water layer; (4) the The above-mentioned water layer with solids is operated 3 times according to the method described in step (2) to obtain new carrot pigment solution; (5) the carrot pigment solution in step (3) and step (4) is vacuumed under the condition of 300Pa Stir and mix at 250 rpm for 30 minutes, heat to 45°C and distill under reduced pressure to dry all the concentrated carrot pigment solutions above; ℃ for 22 hours in a vacuum drying oven under reduced pressure, and ...

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Abstract

The invention relates to a preparation method for a carrot pigment acid-base detection indicator. The preparation method includes the following steps: pulverizing, heating for extraction, skimming, concentration, and drying. The detection capability of the prepared carrot pigment acid-base detection indicator is much better than that of a known carrot pigment acid-base detection indicator; the sensitivity of the prepared carrot pigment acid-base detection indicator is higher than that of ordinary biological acid-base indicators, so that extensive application value in analytical chemistry is achieved, and a prefabricated standard color chart can facilitate observation; the prepared carrot pigment acid-base detection indicator is a purely natural product, and an applied organic reagent is recyclable, so that the carrot pigment acid-base detection indicator is harmless to manufacturers and users, avoids environmental pollution, and achieves incomparable advantages over chemosynthetic indicators.

Description

technical field [0001] The invention relates to a preparation method of an acid-base indicator, in particular to a preparation method of a carrot pigment acid-base detection indicator. Background technique [0002] An acid-base indicator is a reagent used to test the pH of a solution. During the acid-base titration process, as the acidity of the solution changes, its structure changes, causing a color change. The current common acid-base indicators are usually synthetic indicators, such as methyl orange, phenolphthalein, and phenol red; such synthetic indicators are made by chemical synthesis, and there are problems of resource consumption and environmental pollution; and, general synthetic The indicator has only two colors, the color changes are not rich enough and the color difference is small, not sensitive enough, and it is not conducive to judgment and observation. For example, the color of methyl orange changes from red to yellow with the increase of pH value (3.1-4.4...

Claims

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Application Information

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IPC IPC(8): G01N21/80
Inventor 熊开胜张海防谢建庭
Owner DONGCHEN LEADER TESTING
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