Industrial method for extracting purple corn anthocyanin from purple corn

Abstract

The invention discloses an industrial method for extracting purple corn anthocyanin from purple corn. The industrial method comprises the following steps: raw material pretreatment, crushing, first-time acidified water-alcohol solution extraction, second-time acidified water-alcohol solution extraction, extracting solution merging, pressurized concentration and spray drying. The invention belongs to the technical field of anthocyanin extraction, and particularly provides an industrial method for extracting purple corn anthocyanin from purple corn, which effectively utilizes corn bracts, corn leaf sheaths and corn spike stalks, improves the value of the purple corn, and is high in practicability and low in cost.

Description

Technical Field

[0001] The invention belongs to the technical field of anthocyanin extraction, and specifically refers to an industrial method for extracting purple corn anthocyanin from purple corn. Background Art

[0002] Anthocyanin is a natural pigment widely found in nature. Most of the coloring substances of plant species are related to it. Purple corn contains a large amount of anthocyanin, and the purple corn anthocyanin extracted from purple corn has the effects of non-toxicity, high safety, anti-oxidation, improving blood circulation, inhibiting inflammation and allergies, and anti-cancer. It is a pure natural anti-aging nutritional supplement. my country produces a lot of corn husks, corn sheaths and corn cobs waste every year, which causes great waste of resources and environmental pollution. And corn husks, corn sheaths and corn cobs are rich in anthocyanin. Therefore, a new industrial method for extracting purple corn anthocyanin from purple corn is urgently needed to solve the above problems. Summary of the invention

[0003] In order to solve the above existing problems, the present invention provides an industrial method for extracting purple corn anthocyanins from purple corn, which effectively utilizes corn husks, corn sheaths and corn cobs to improve the value of purple corn and has high practicality and low cost.

[0004] The technical solution adopted by the present invention is as follows: The industrial method for extracting purple corn anthocyanins from purple corn comprises the following steps:

[0005] S1. Raw material pretreatment: After the purple corn matures, the bracts, leaf sheaths and cobs are peeled off as raw materials, and the corn kernels are reserved for other uses. The raw materials are air-dried in a place not exposed to direct sunlight;

[0006] S2, crushing: put the dried raw materials into a feed crusher and crush them;

[0007] S3, first acidified water-alcohol solution extraction: pour the crushed raw material into the extraction tank for heating reflux extraction, the extraction conditions are: 60% acidified ethanol solution, material-liquid ratio 1:10, after the extraction is completed, filter to obtain the first filtrate;

[0008] S3, second acidified water-alcohol solution extraction: the filter residue filtered out in step 2 is heated and refluxed again, and the extraction conditions are: 60% acidified ethanol solution, solid-liquid ratio 1:8, after the extraction is completed, the second filtrate is filtered;

[0009] S4, combining the extracts: combining the first filtrate and the second filtrate to obtain an extract;

[0010] S5, pressurized concentration: pressurizing and concentrating the extract to obtain a purple corn anthocyanin concentrate;

[0011] S6. Spray drying: spray drying the purple corn anthocyanin concentrate to obtain a crude extract of purple corn anthocyanin.

[0012] Furthermore, the dried raw material in step 2 is crushed into a volume of 1 cm 2 of small pieces.

[0013] Furthermore, in step 3, the extraction temperature is 60-70° C., and the extraction time is 2.5 h, and the extraction time includes the heating time.

[0014] Furthermore, in step 4, the extraction temperature is 60-70° C., and the extraction time is 1.5 h, and the extraction time includes the heating time.

[0015] Furthermore, in step 6, the spray drying air inlet temperature is 120°C, and the spray drying air outlet temperature is 80°C.

[0016] The beneficial effects achieved by the present invention using the above structure are as follows: the industrial method for extracting purple corn anthocyanins from purple corn proposed in this scheme extracts anthocyanins from corn husks, corn sheaths and corn cobs, thereby increasing the value of purple corn, having high practicality and low cost. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] The industrial method for extracting purple corn anthocyanins from purple corn proposed in this scheme comprises the following steps:

[0019] S1. Raw material pretreatment: After the purple corn matures, the bracts, leaf sheaths and cobs are peeled off as raw materials, and the corn kernels are reserved for other uses. The raw materials are air-dried in a place not exposed to direct sunlight;

[0020] S2. Crushing: Put the dried raw materials into the feed crusher and crush them into small pieces with a volume of 1cm 2 small pieces;

[0021] S3, first acidified water-alcohol solution extraction: pour the crushed raw material into the extraction tank for heating reflux extraction, the extraction conditions are: 60% acidified ethanol solution, solid-liquid ratio 1:10, extraction temperature 60-70°C, extraction time 2.5h, the extraction time includes the heating time, after the extraction is completed, filter to obtain the first filtrate;

[0022] S3, second acidified water-alcohol solution extraction: the filter residue filtered out in step 2 is heated and refluxed again, the extraction conditions are: 60% acidified ethanol solution, solid-liquid ratio 1:8, extraction temperature 60-70°C, extraction time 1.5h, the extraction time includes the heating time, after the extraction is completed, filter to obtain the second filtrate;

[0023] S4, combining the extracts: combining the first filtrate and the second filtrate to obtain an extract;

[0024] S5, pressurized concentration: pressurizing and concentrating the extract to obtain a purple corn anthocyanin concentrate;

[0025] S6. Spray drying: spray drying the purple corn anthocyanin concentrate, with the spray drying air inlet temperature being 120° C. and the spray drying air outlet temperature being 80° C., to obtain a crude extract of purple corn anthocyanin.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An industrial method for extracting purple corn anthocyanins from purple corn, characterized in that: The following steps are involved: S1. Raw material pretreatment: After the purple corn matures, the bracts, leaf sheaths and cobs are peeled off as raw materials, and the corn kernels are reserved for other uses. The raw materials are air-dried in a place not exposed to direct sunlight; S2, crushing: put the dried raw materials into a feed crusher and crush them; S3, first acidified water-alcohol solution extraction: pour the crushed raw material into the extraction tank for heating reflux extraction, the extraction conditions are: 60% acidified ethanol solution, material-liquid ratio 1:10, after the extraction is completed, filter to obtain the first filtrate; S3, second acidified water-alcohol solution extraction: the filter residue filtered out in step 2 is heated and refluxed again, and the extraction conditions are: 60% acidified ethanol solution, solid-liquid ratio 1:8, after the extraction is completed, the second filtrate is filtered; S4, combining the extracts: combining the first filtrate and the second filtrate to obtain an extract; S5, pressurized concentration: pressurizing and concentrating the extract to obtain a purple corn anthocyanin concentrate; S6. Spray drying: spray drying the purple corn anthocyanin concentrate to obtain a crude extract of purple corn anthocyanin.

2. An industrial method for extracting purple corn anthocyanins from purple corn according to claim 1, characterized in that: The dried raw material in step 2 is crushed into pieces with a volume of 1 cm 2 of small pieces.

3. An industrial method for extracting purple corn anthocyanins from purple corn according to claim 1, characterized in that: In step 3, the extraction temperature is 60-70° C. and the extraction time is 2.5 h, and the extraction time includes the heating time.

4. The industrial method for extracting purple corn anthocyanins from purple corn according to claim 1, characterized in that: In step 4, the extraction temperature is 60-70° C. and the extraction time is 1.5 h, which includes the heating time.

5. The industrial method for extracting purple corn anthocyanins from purple corn according to claim 1, characterized in that: In step 6, the spray drying air inlet temperature is 120°C, and the spray drying air outlet temperature is 80°C.