CN1065079A - The method of extracting Chinese sorghum red pigment by use of water - Google Patents

Abstract

The invention discloses a kind of production method of extracting natural Chinese sorghum red pigment.It is also could in the red position of exsiccant sorghum plant 24 hours of having been pulverized by the water logging of pH8 bubble or soak at 60-80 ℃ in 1-2 hours, the centrifugal reddish-brown liquid (A) that gets, material soaked 24 hours under buck again, the centrifugal reddish-brown liquid (B) that gets, and material gets reddish-brown liquid (C) with the clear water wash-out.With the acidifying together of (A)+(B)+(C) reddish-brown liquid, adjust pH is to pH6-4, and leaving standstill after 1-2 hours has haematochrome to separate out, and the centrifugal reddish-brown thick liquid that gets transfers to pH8 vacuum-drying with the pH value and promptly gets the natural Chinese sorghum red pigment finished product.Especially for foodstuffs industry, cosmetic industry etc.

Description

The method of extracting Chinese sorghum red pigment by use of water

The present invention is the method with the contained haematochrome in red position of water extraction sorghum plant, fruit.

The method of existing extraction red sorghum pigment, with the haematochrome in alcohols (mainly being ethanol or Diluted Alcohol solution) the extracting Chinese sorghum fruit shell, the extract concentrate drying obtains finished product.Weak point is to want the more energy of consumption rate the present invention, with the ethanol-extracted red sorghum pigment fire prevention, explosion-proof shield and safeguard procedures will be arranged also, also need refluxing extraction device, alcohol retrieving arrangement, concentrate and drying installation etc.Facility investment is big, generally also will leave the city and just can do factory, is subjected to certain limitation.

The present invention be take water soak at normal temperatures (with alkali regulate to keep PH8 or more than) exsiccant sorghum husk powder (or other red position of sorghum plant) 24 hours, perhaps soaked 1-2 hour down at 60-80 ℃, centrifugal then.Centrifugal rotational speed is collected reddish-brown leaching liquid [A] at 4000 Υ/below the min, and material carries out immersion second time again, and method is with above-mentioned.Be dipped into after the time centrifugally again, collect reddish-brown leaching liquid [B], the material flushing with clean water, the reddish-brown liquid [C] of collection wash-out, slag can discard or open up other purposes.Reddish-brown liquid [A], [B], [C] collect and are acidified to PH6-4 together, left standstill 1-2 hour, there is red to separate out, this moment can be centrifugal (or standing over night, discard supernatant liquid), discard clear liquid and collect the reddish-brown thick liquid, transfer again PH to 8 or more than, vacuum-drying (or 80 ℃ down dry, promptly get natural Chinese sorghum red pigment, be milled to Powdered) be finished product.This finished product water soluble or aqueous ethanolic solution, product yield 7-9% can be used for foodstuffs industry, makeup or other requires the purposes of nontoxic red coloration.

The key equipment that the present invention needs is 4000 Υ/min low speed centrifuge.

Production technique of the present invention is easy, and facility investment is few, and it is low to consume energy, and cost is also lower.Accompanying drawing is seen in its technical process.Below with reference to accompanying drawing the present invention is further described.

Raw material is that the shell of red position of exsiccant sorghum plant or Chinese sorghum fruit enters pulverizer [1], and powder enters steeping tank [2], and the water that will be five times in raw material (w/w) simultaneously enters steeping tank [2], and to soak the pH value of adjusting in the steeping tank with alkali be PH8.Soak 24 hours (perhaps heat 60-80 ℃ 1-2 hour) stirring at low speed.To expect and solution injection whizzer [3], feed liquid is separated, reddish-brown liquid [A] is injected souring tank [6], and material enters steeping tank [4] again, annotates and is five times in the water of raw material (w/w) in steeping tank [4], soak 24 hours (perhaps 60-80 ℃ 1-2 hour), stirring at low speed will be expected and solution injects whizzer [5], get reddish-brown liquid [B], inject souring tank [6], in washing whizzer [5] expect reddish-brown liquid [C], inject souring tank [6], discard the slag in the whizzer [5], with [A], [B], [C] injects the reddish-brown liquid of souring tank [6], transfer to PH6-4 with acid, left standstill 1-2 hour, inject whizzer [7], discard clear water, thick liquid is entered alkalization jar [8], transfer to PH8, enter vacuum drier [9] (or in 80 ℃ of drying plant dryings with alkali, be milled to powder) be finished product, weigh [10] pack [11] afterwards.Adjusting the used alkali of pH value is best with NaOH, and acid is best with HCl.

Claims (1)

1. The present invention is the method with the water extraction natural Chinese sorghum red pigment.Its Production Flow Chart is the red position of disintegrating Chinese sorghum plant (containing the shell of fruit etc.) alkaline soak, centrifugal gained reddish-brown liquid, be acidified to PH6-4, haematochrome is separated out from water, centrifugal gained reddish-brown thick liquid, be basified to PH8 again, vacuum-drying (or 80 ℃ down dry, grind) promptly get natural Chinese sorghum red pigment finished product (other nontoxic alkali, acid are all available, are the best with NaOH and HCl).The producing and manufacturing technique of this alkali-acid-alkali is main points of the present invention.Raw material is repeatedly extracted the yield that can improve finished product with method of the present invention.

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