Background technology
Incense with golden color willow (Melaleuca bracteata cv.Revolution Gold), is again thousand layers of gold, and Myrtaceae white spirit layer belongs to, branch is elongated, one of fine tree species that blade golden yellow or yellow is township afforestation, beautify the environment, are applicable to planting in loke shore limit, river.Pigment in plant leaf comprises chlorophyll, anthocyanidin and carotenoid, and these several pigments shared component and determining positions in cell the color of leaf, and in the time that carotenoid proportion is larger, blade is orange or yellow.Carotenoid is to be synthesized and presented yellow, an orange red and red large class terpene coloring matter by Isoprenoid pathway in organism.Carotenoid is not only as photosynthetic accessory pigment, participate in carrying out luminous energy transmission and Substance Transformation, and be the important natural pigment of a class, give animals and plants with the color and luster such as yellow, orange and red, there is important physiological function, can preventing chronic disease, suppress tumour, anti-oxidant and strengthen human immunity activity etc.
At present, the research of incense with golden color willow is mainly concentrated on the cultivation management aspects such as breediness, the prevention and control of plant diseases, pest control and grafting both at home and abroad, and the extraction of its carotenoid is studied, there is not yet the report that utilizes ultrasonic assisted Extraction to follow the example of extraction.
Summary of the invention
The object of the invention is to provide a kind of method of extracting carotenoid from incense with golden color willow.
The technical scheme that the present invention takes is:
The concrete steps of the method for extracting carotenoid from incense with golden color willow of the present invention are as follows:
(1) first gather fresh incense with golden color willow leaf sheet, then put into Freeze Drying Equipment freeze-drying 30-60h;
(2) the incense with golden color willow leaf sheet after freeze-drying is pulverized, crossed 40 mesh sieves;
(3) then toward pulverize after blade in add acetone and sherwood oil mixed extract, solid-liquid ratio is 1: 15-40;
(4) carry out ultrasonic assisted extraction, ultrasonic power is 40-90W again, and ultrasonic temperature is 20-70 DEG C, and ultrasonic time 5-50min extracts 1-4 time;
(5) extract after, carry out centrifugal, at 4 DEG C, under rotating speed 8000rpm, extract 10min, draw supernatant liquor, can obtain the solution that contains carotenoid.
In step (1), preferably put into Freeze Drying Equipment freeze-drying 48h.
In step (3), in acetone and sherwood oil mixed extract, the weight ratio of acetone and sherwood oil is 1-9: 3, be preferably 6: 3.
In step (3), solid-liquid ratio is preferably 1: 36.
In step (3), preferably ultrasonic power is 50W, and ultrasonic temperature is 63 DEG C, and ultrasonic time 20min extracts 2 times.
In above-mentioned steps, note lucifuge, in operating process, action should be wanted rapidly, after EO, to cover as early as possible bottle cap, avoids sample liquid too much to contact with air and oxidized.
Positively effect of the present invention is as follows:
The method of extracting carotenoid from incense with golden color willow of the present invention has advantages of convenient and swift and simple to operate, low for equipment requirements, and uses the extraction yield of method extraction carotenoid of the present invention high.
Embodiment
The following examples are to describe in further detail of the present invention.
Embodiment 1
(1) first gather fresh incense with golden color willow leaf sheet, then put into Freeze Drying Equipment freeze-drying 30h;
(2) the incense with golden color willow leaf sheet after freeze-drying is pulverized, crossed 40 mesh sieves;
(3) then toward pulverize after blade in add acetone and sherwood oil mixed extract, solid-liquid ratio is 1: 15;
(4) carry out ultrasonic assisted extraction, ultrasonic power is 40W again, and ultrasonic temperature is 20 DEG C, and ultrasonic time 50min extracts 4 times;
(5) extract after, carry out centrifugal, at 4 DEG C, under rotating speed 8000rpm, extract 10min, draw supernatant liquor, can obtain the solution that contains carotenoid.
In step (3), in acetone and sherwood oil mixed extract, the weight ratio of acetone and sherwood oil is 1: 3.
Embodiment 2
(1) first gather fresh incense with golden color willow leaf sheet, then put into Freeze Drying Equipment freeze-drying 60h;
(2) the incense with golden color willow leaf sheet after freeze-drying is pulverized, crossed 40 mesh sieves;
(3) then toward pulverize after blade in add acetone and sherwood oil mixed extract, solid-liquid ratio is 1: 40;
(4) carry out ultrasonic assisted extraction, ultrasonic power is 90W again, and ultrasonic temperature is 70 DEG C, and ultrasonic time 50min extracts 1 time;
(5) extract after, carry out centrifugal, at 4 DEG C, under rotating speed 8000rpm, extract 10min, draw supernatant liquor, can obtain the solution that contains carotenoid.
In step (3), in acetone and sherwood oil mixed extract, the weight ratio of acetone and sherwood oil is 9: 3.
Embodiment 3
(1) first gather fresh incense with golden color willow leaf sheet, then put into Freeze Drying Equipment freeze-drying 48h;
(2) the incense with golden color willow leaf sheet after freeze-drying is pulverized, crossed 40 mesh sieves;
(3) then toward pulverize after blade in add acetone and sherwood oil mixed extract, solid-liquid ratio is 1: 36;
(4) carry out ultrasonic assisted extraction, ultrasonic power is 50W again, and ultrasonic temperature is 63 DEG C, and ultrasonic time 20min extracts 2 times;
(5) extract after, carry out centrifugal, at 4 DEG C, under rotating speed 8000rpm, extract 10min, draw supernatant liquor, can obtain the solution that contains carotenoid.
In step (3), in acetone and sherwood oil mixed extract, the weight ratio of acetone and sherwood oil is 6: 3.
The mensuration of carotenoid content
The solution that contains carotenoid prepared by embodiment of the present invention 1-3 carries out the mensuration of carotenoid content.
Measuring method:
Draw supernatant liquor 2mL, revolve and steam to dry, use 2mL sherwood oil to redissolve quantitatively, shake up and make it whole dissolvings; Draw 0.5mL sherwood oil again and be diluted to 5mL, measure absorbancy with spectrophotometer at 445nm place, calculate yield according to formula (1), test repeats 2 times.
X=(1000EV)/(A×W) (1)
In formula: X-total carotinoid content (mg kg
-1); The absorbance that E-records; The volume (mL) of the last constant volume of V-sample; The alleged example weight of W-(g); The average optical extinction coefficient of A-carotenoid is 2500.
Experimental result is as shown in table 1:
Table 1
Sample |
Extract yield (mg kg
-1DW)
|
Embodiment 1 |
19.32 |
Embodiment 2 |
18.65 |
Embodiment 3 |
21.73 |
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, amendment, replacement and modification to these embodiment, scope of the present invention is limited by claims and equivalent thereof.