Method for drying honeysuckles

Abstract

The invention discloses a method for drying honeysuckles. The method includes placing screened fresh honeysuckles into color-protecting solution; laying the honeysuckles on stainless steel screen cloth after the color-protecting solution on the honeysuckles is drained, and placing the stainless steel screen cloth in a drying chamber of a heat pump drying machine; setting the temperature of the drying chamber at 40-60 DEG C, setting an air speed of the drying chamber at 1-2.5m / s and setting the concentration of oxygen in the drying chamber at 5-21%; filling the drying chamber with nitrogen for 3-5 minutes at intervals of 20-30 minutes in drying procedures, keeping the required concentration of the oxygen in the drying chamber unchanged, and drying the honeysuckles for 6-10 hours to obtain the honeysuckles which are dried by the aid of heat pumps; placing the screen cloth with the honeysuckles into a microwave generator after the honeysuckles are dried by the aid of the heat pumps, and drying the honeysuckles by the aid of microwaves until the moisture contents of the honeysuckles are lower than or equal to 12%; spreading the honeysuckles in cool, clean and ventilation positions to temper the honeysuckles; loading the honeysuckles in compound zip-lock bags, and filling the insides of the bags with nitrogen so that the concentration of oxygen in each bag is lower than or equal to 5%. The drying chamber of the heat pump drying machine is preheated for at least 30 minutes before the stainless steel screen cloth is placed in the drying chamber. The method has the advantages that a manufacturing process is simple, the cost is low, and the quality of products are stable; a brightness value L of the honeysuckles manufactured by the method is larger than 60, the total phenol content of the honeysuckles is higher than 0.5%, a chlorogenic acid loss rate is lower than 20%, and the method has obvious merits, an important application prospect and high popularization utilization value.

Description

technical field [0001] The invention belongs to the field of new technologies for drying agricultural products, and in particular relates to a method for drying honeysuckle. Background technique [0002] Honeysuckle is the flower bud of Lonicera Lonicerae, which has the functions of clearing away heat and detoxification, dredging the throat, relieving heat and annoyance, and inhibiting bacteria. It is a green natural product with "medicine and food from the same source". The water content of fresh honeysuckle is about 80%, the color is light green, the smell is fragrant, and the medicinal value is the highest, but it is not conducive to transportation and storage, and must be dried in time. Good drying will give honeysuckle a light yellow-green color and a plump appearance, while improper drying will often cause deterioration of appearance color and loss of medicinal quality. [0003] At present, before drying, honeysuckle usually needs to be treated with high-temperature s...

AI Technical Summary

Problems solved by technology

However, honeysuckle is prone to severe browning when hot air is dried, and the content of its main functional components, chlorogenic acid and luteolin, are significantly reduced.

While advanced technologies such as vacuum freeze-drying and infrared radiation drying can reduce the loss of honeysuckle active substances in the drying process, their high price and low drying capacity restrict their application in actual production.