CN110800910A - A kind of microwave drying method of honeysuckle - Google Patents

Abstract

The invention relates to the field of processing and processing of Chinese medicinal materials, in particular to a method for microwave drying of honeysuckle. It mainly includes the steps of microwave fixing and microwave drying. After microwave vacuum drying, blue-green honeysuckle is obtained. The moisture of the dried product is less than 5%, and the flower shape is well maintained, and there is no blackening and zooming phenomenon. Compared with the prior art, the present invention adopts a lower temperature to microwave the fresh honeysuckle to deactivate the polyphenol oxidase, no longer reacts and consumes chlorogenic acid, so that the retention of the active ingredient chlorogenic acid is compared with that of the prior art. The traditional drying method is greatly improved; while microwave vacuum drying provides the energy required for drying, it can also extract the water evaporated from the drying equipment in time, greatly shortening the subsequent drying time, and the finished honeysuckle has a bright color and a fragrant smell. the overall quality of honeysuckle.

Description

A kind of microwave drying method of honeysuckle

technical field

The invention relates to the field of processing and processing of Chinese medicinal materials, in particular to a method for microwave drying of honeysuckle.

Background technique

Honeysuckle is the dried flower buds or flowers with early blooming of the honeysuckle plant, honeysuckle. It has been used medicinally for thousands of years and has pharmacological effects such as antibacterial, antiviral, antipyretic, anti-inflammatory and antioxidant. The harvesting and processing of honeysuckle is one of the key links affecting the quality of medicinal materials. The traditional drying method of honeysuckle is to use gradient baking in soil oven, which has the problems of low drying efficiency and difficult control of drying temperature, while the temperature of steam fixing is too high and the energy consumption is large, and these two methods will make honeysuckle effective. The component chlorogenic acid is decomposed by high temperature, making the color of the finished product dark yellow, etc., resulting in a huge difference in quality and quality of honeysuckle, and gradually unable to adapt to the large-scale, intensive, modern, and seasonal development of the honeysuckle industry, and cannot achieve the expected clinical efficacy. Can't adapt to the high-quality, fast-paced modern life.

SUMMARY OF THE INVENTION

Fresh honeysuckle at room temperature changes color from cyan to white, then to yellow, and finally to dark brown. The present inventors found that during the drying process of honeysuckle that has not undergone green fixation treatment, the increase in temperature promotes the oxidation reaction of polyphenol oxidase, which consumes chlorogenic acid as one of the reaction substrates. The polyphenol oxidase has been inactivated in the honeysuckle treated with greening, so the active ingredient chlorogenic acid has been retained in the greatest amount.

The object of the present invention is to solve the defects of traditional honeysuckle drying processing method with low drying efficiency, high energy consumption, many losses of active ingredients such as chlorogenic acid and flavonoids, and dark yellow color of dry product, and provides a kind of protection method for the active ingredients of honeysuckle. On the premise, the technology of combining microwave fixing and microwave vacuum drying is adopted, so that the temperature control of medicinal materials in the drying stage is lower, the drying time is short, the drying efficiency is improved, the energy consumption is saved, and the active ingredients are not damaged. content, retains the unique fragrance of honeysuckle, and obtains better quality dried honeysuckle.

A method for microwave drying of honeysuckle flowers provided by the invention specifically comprises the following steps:

(1) Microwave fixing: place the fresh honeysuckle neatly and evenly in the airtight microwave vacuum drying equipment, and use microwave fixing to fix the honeysuckle. The microwave power is 3kw, and the moisture in the fresh honeysuckle is under the radiation of microwave heat. Self-generated steam to fix honeysuckle, the fixing temperature is 70-90 ℃, and the time is 1-3 minutes;

(2) Microwave drying: Microwave drying of the honeysuckle that has been cured by microwave under vacuum, the vacuum degree is -80kPa, the microwave power is 3kW, the drying temperature is 70-90°C, and the drying time is 15-20 minutes.

In the microwave drying step, blue-green honeysuckle is obtained after microwave drying, the moisture content of the dried product is less than 5%, the pattern is well maintained, and there is no blackening and zooming phenomenon.

The beneficial effects of the present invention: compared with the prior art, the present invention adopts a lower temperature to microwave the fresh honeysuckle to deactivate the polyphenol oxidase, no longer reacts and consumes chlorogenic acid, and makes the active ingredient chlorogenic acid The retention of acid content is greatly improved compared with the traditional drying method; while microwave vacuum drying provides the energy required for drying, it can also extract the moisture evaporated from the drying equipment in time, greatly shortening the subsequent drying time, and the color of the finished honeysuckle Bright and fragrant, it enhances the overall quality of honeysuckle.

Detailed ways

The present invention can be better understood from the following examples. However, those skilled in the art can easily understand that the specific process conditions described in the embodiments are only used to illustrate the present invention, and obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1:

A method for microwave drying of honeysuckle, specifically comprising the following steps:

(1) Microwave fixing: place the fresh honeysuckle neatly and evenly in the airtight microwave vacuum drying equipment, and use microwave fixing to fix the honeysuckle. The power of the microwave is 3kW, and the moisture in the fresh honeysuckle is under the radiation of microwave heat. The steam is generated by itself to fix the honeysuckle, the fixing temperature is 70 ℃, and the time is 1 minute;

(2) Microwave drying: Microwave drying of the honeysuckle that has been cured by microwave under vacuum, the vacuum degree is -80kPa, the microwave power is 3kW, the drying temperature is 70°C, and the drying time is 15 minutes.

After microwave drying, blue-green honeysuckle is obtained, the moisture content of the dried product is less than 5%, the flower shape is well maintained, and there is no blackening and zooming phenomenon.

Example 2:

A method for microwave drying of honeysuckle, specifically comprising the following steps:

(1) Microwave fixing: place the fresh honeysuckle neatly and evenly in the airtight microwave vacuum drying equipment, and use microwave fixing to fix the honeysuckle. The microwave power is 3kw, and the moisture in the fresh honeysuckle is under the radiation of microwave heat. Self-generated steam to fix honeysuckle, the fixing temperature is 90 °C, and the time is 3 minutes;

(2) Microwave drying: The honeysuckle that has been cured by microwave is microwave-dried under vacuum, the vacuum degree is -80kPa, the microwave power is 3kW, the drying temperature is 80°C, and the drying time is 20 minutes.

After microwave drying, blue-green honeysuckle is obtained, the moisture content of the dried product is less than 5%, the flower shape is well maintained, and there is no blackening and zooming phenomenon.

Example 3:

A method for microwave drying of honeysuckle, specifically comprising the following steps:

(1) Microwave fixing: Put the fresh honeysuckle evenly in the tray, load it in a closed microwave vacuum drying equipment, and use microwave fixing to fix the honeysuckle. The power of the microwave is 3kW, and the moisture in the fresh honeysuckle is heated by the microwave. Under the action of radiation, the steam is generated by itself to fix the honeysuckle, the fixing temperature is 80 ℃, and the time is 2 minutes;

(2) Microwave drying: The honeysuckle that has been cured by microwave is microwave-dried under vacuum, the vacuum degree is -80kPa, the microwave power is 3kW, the drying temperature is 80°C, and the drying time is 20 minutes.

After microwave drying, blue-green honeysuckle is obtained, the moisture content of the dried product is less than 5%, the flower shape is well maintained, and there is no blackening and zooming phenomenon.

Comparative Example 1:

A method for microwave drying of honeysuckle, specifically comprising the following steps:

(1) Microwave fixing: Put the fresh honeysuckle evenly in the tray, load it in a closed microwave vacuum drying equipment, and use microwave fixing to fix the honeysuckle. The power of the microwave is 3kW, and the moisture in the fresh honeysuckle is heated by the microwave. Under the action of radiation, the steam is generated by itself to fix the honeysuckle, and the fixing temperature is 70 ℃ and the time is 30 seconds;

(2) Microwave drying: Microwave drying of the honeysuckle that has been cured by microwave under vacuum, the vacuum degree is -80kPa, the microwave power is 3kW, the drying temperature is 70°C, and the drying time is 20 minutes.

After microwave drying, blue-green honeysuckle is obtained. The moisture content of the dried product is more than 5%, and the flower shape is well maintained, and there is no blackening and zooming phenomenon.

Comparative Example 2:

A method for microwave drying of honeysuckle, specifically comprising the following steps:

(1) Microwave fixing: Put the fresh honeysuckle evenly in the tray, load it in a closed microwave vacuum drying equipment, and use microwave fixing to fix the honeysuckle. The power of the microwave is 6kW, and the moisture in the fresh honeysuckle is heated by the microwave. Under the action of radiation, the steam is generated by itself to fix the honeysuckle, the fixing temperature is 100 ℃, and the time is 1 minute;

(2) Microwave drying: Microwave drying of the honeysuckle that has been cured by microwave under vacuum, the vacuum degree is -80kPa, the microwave power is 6kW, the drying temperature is 100°C, and the drying time is 20 minutes.

After microwave drying, dark yellow honeysuckle is obtained, the moisture content of the dried product is less than 5%, the edge of the flower is lost, and the dried honeysuckle is black and zoomed.

Comparative Example 3:

A method for microwave drying of honeysuckle, specifically comprising the following steps:

After the fresh honeysuckle is neatly and evenly arranged on the perforated tray, it is steamed at 100°C and dried at 90°C for 6 hours.

A dark yellow wrinkled honeysuckle was obtained, the moisture content of the dried product was less than 5%, the edges of some flowers were lost, and the dried honeysuckle was partly black and zoomed.

Chlorogenic acid content determination in embodiment and comparative example:

Determine according to high performance liquid chromatography (General Rule 0512).

(1) Chromatographic conditions

Chromatographic column: Agilent TC-C18 (5μm, 150mm×4.6mm); mobile phase: acetonitrile: 0.4% phosphoric acid aqueous solution (13:87), detection wavelength: 327nm; flow rate: 1mL/min; column temperature: 30℃; injection Amount of 10μl.

(2) Preparation of reference solution

Weigh an appropriate amount of chlorogenic acid reference substance, accurately weigh it, put it in a brown volumetric flask, add 50% methanol to make a solution containing 40μg per 1ml, that is (store below 10°C).

(3) Preparation of the test solution

Take about 0.5g of this product powder (passed through a No. 4 sieve), accurately weigh it, put it in a conical flask with a stopper, add 50 mL of 50% methanol precisely, weigh it, ultrasonically treat it (power 250W, frequency 35kHz) for 30min, let it cool down Weigh it, supplement the lost mass with 50% methanol, filter after shaking, accurately measure 5 mL of the continuous filtrate, put it in a 25 mL brown volumetric flask, add 50% to the volume, and shake well.

Precisely draw 10 μL of the reference solution and the test solution prepared in the above-mentioned examples and comparative examples, and inject it into a liquid chromatograph to measure the peak area of chlorogenic acid. This product is calculated as a dry product and contains chlorogenic acid (C ₁₆ H ₁₈ O ₉ ) shall not be less than 1.5%.

The content of chlorogenic acid in the dried honeysuckle products obtained under Example 1-3 and Comparative Example 1-3 was measured, and the results were as follows.

Chlorogenic acid content % Example 1 3.92 Example 2 3.88 Example 3 3.95 Comparative Example 1 3.23 Comparative Example 2 3.10 Comparative Example 3 3.02

As can be seen from the above table, the content of the main active ingredient chlorogenic acid in the dried honeysuckle product obtained by the microwave drying process adopted in the present invention is obviously greater than that in the steam fixing and drying processes. The content of chlorogenic acid in dry products will also be affected when the microwave curing time is short, the temperature is too high or the microwave power is too high. In contrast, the dried products obtained in Examples 1-3 have better retention of pattern and color, more complete appearance, and greatly shortened drying time, saving energy consumption and cost.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or technology of the present invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention.

Claims (2)

1. a method for honeysuckle microwave oven drying, is characterized in that, specifically comprises the following steps: (1) Microwave fixing: place the fresh honeysuckle neatly and evenly in the airtight microwave vacuum drying equipment, and use microwave fixing to fix the honeysuckle. The microwave power is 3kw, and the moisture in the fresh honeysuckle is under the radiation of microwave heat. Self-generated steam to fix honeysuckle, the fixing temperature is 70-90 ℃, and the time is 1-3 minutes; (2) Microwave drying: Microwave drying of the honeysuckle that has been cured by microwave under vacuum, the vacuum degree is -80kPa, the microwave power is 3kW, the drying temperature is 70-90°C, and the drying time is 15-20 minutes. 2. a kind of honeysuckle microwave drying method as claimed in claim 1, is characterized in that, in described microwave drying step, after microwave drying obtains blue-green honeysuckle, the moisture of dry product is less than 5%, and pattern keeps better, no blackening and zooming phenomenon.