Dewatering and drying method for leaves of stevia rebaudiana

Abstract

The invention discloses a dewatering and drying method for leaves of stevia rebaudiana Jiangtian No. 1. According to the method, stevia rebaudiana is harvested after drying of dew; an optimal harvesting period for the leaves of stevia rebaudiana is that 10% of stevia rebaudiana plants in a field are in a squaring stage (an early budding stage); harvested stem leaves should be protected from rain and piling; black leaves, yellow leaves and withered leaves should be removed at first before disleaving, then fresh and green leaves are sliped off by hand, and the rate of impurities like branches, buds, dust and silt of the plants in the leaves of stevia rebaudiana should be controlled within 10%; it should be guaranteed that disleaving is carried out as soon as the fresh leaves are harvested, the leaves are dried in the sun once after disleaving is carried out and the leaves are dried within one day so as to ensure dry leaf quality. Drying standards for the leaves of stevia rebaudiana are that water content in the leaves is less than 10% and are frangible when touched with hand. The dried leaves of stevia rebaudiana have to be put into a moistureproof food packaging bag or polyethylene plastic bag in time, and the mouth of the bag has to be fastened and closed so as to prevent the leaves of stevia rebaudiana from mildew because of moisture absorption under natural conditions. The method provided by the invention is more suitable for dewatering and drying of the leaves of stevia rebaudiana Jiangtian No. 1.

Description

technical field [0001] The invention relates to a method for dehydration, drying and preservation of "Jiangtian No. 1" stevia leaves. Background technique [0002] Stevia is an emerging industry. The glycosides extracted from Stevia leaves have the characteristics of high sweetness and low calorie, and are considered by the world as the third-generation healthy sugar source. Jiangsu, Anhui, Jiangxi, Sichuan, Xinjiang and Heilongjiang are the main producing areas of stevia. With the rapid development of the stevia industry, stevia has been introduced and grown all over the country. Dongtai City is the largest stevia planting base in the country, with an annual planting area of ​​80,000 mu and a dry leaf weight of 12,000 tons. Often some farmers do not properly dehydrate and dry stevia leaves, resulting in poor quality of dried leaves and low sales prices, and manufacturers are reluctant to purchase. The quality of dry leaves is related to the harvesting period, harvesting t...

AI Technical Summary

Problems solved by technology

Often some farmers do not use proper dehydration and drying methods for stevia leaves, resulting in poor quality of dried leaves and low sales prices, and manufacturers are reluctant to purchase them.