3. Change the water in the basin every day. If the gauze is dry, wet it again and unscrew the cover to keep the beans moist. It usually takes 2-3 days to germinate. Carefully take out the bean sprouts and rinse them, then you can cook them.
Bean sprouts are the most common vegetables on the table of ordinary people. Its variety, comprehensive nutrition, unique flavor, refreshing fragrance, deeply loved by people.
Bean sprouts are formed after germination, so bean sprouts are also called "live vegetables". The nutritional value and utilization rate have also been greatly improved. Usually, dried bean curd basically contains no vitamin C, but bean sprouts are very rich in vitamin C, which can maintain skin elasticity and is a good beauty product.
However, although bean sprouts are rich in vitamin C and B vitamins, their contents are unstable. Take mung bean sprouts as an example. When the content of vitamin C is high, it can reach more than 100 mg per 500 g, and only 30 mg when it is low. How to judge?
The easiest way is to look at the length. When mung bean sprouts grow to about one inch, the nutritional value is the highest, and the content of vitamin C per 500 grams can reach 180 mg. After more than one inch, the longer it is, the lower the vitamin C content, until it exceeds 3 inches, and only contains 30-40 mg per 500 grams. Therefore, eating bean sprouts about one inch has the highest nutritional value. In addition, the bigger the bean sprouts, the better. Most of the fat and big ones are promoted by hormones and fertilizers. How to judge whether bean sprouts are stimulated by hormones?
The easiest way is to look at the roots of bean sprouts. Generally speaking, the roots of naturally germinated bean sprouts are longer, and the roots of hormone-promoted bean sprouts are shorter. If you can't buy suitable and safe bean sprouts in the market, it is recommended to send them yourself. The steps are as follows:
1. Choose beans first, and pay attention to remove all floating beans when cleaning (floating beans may be empty or bad).
Then soak the beans in warm water for one day and one night. When the beans swell, rinse and drain, put them in a clean basin and cover them with a wet cloth. Wash the seed buds with clean water at least three times a day.
After a few days, when the bean sprouts grow to an inch, they can be eaten.
Training technology editor
Cultivation process
1. Bean selection: Wash with clear water, and pay attention to remove all floating beans (mung beans, soybeans and peas) when washing. These floating beans are immature or have deteriorated, and the germination rate is extremely low.
bean sprout
bean sprout
2. Use a cylinder, or a large plastic box, or other container (the material doesn't matter, it's clean, and the bottom can be drained), spread a layer of clean sand with a thickness of about 5CM, and evenly spread a layer of washed beans on the sand, not too much, otherwise it will be easily broken. Evenly cover the beans with a layer of clean sand, with a thickness of about 1CM.
3. Water several times a day to keep the humidity, but don't let the water stay.
After a few days, the bean sprouts will arch out. Wash the sand with clean water.
Technical points
1, remove bad beans when cleaning.
2. The drainage effect of the container is good. Never let beans soak in water, and keep enough humidity.
Don't let the beans see the sun, or they will turn green immediately. Covering with sand can avoid the sun. If you are not at ease, you can cover the container with a lid.
Bean sprout cultivation
Bean sprout cultivation
4, beans grow fast after germination, so harvest should be timely.
Matters needing attention
1, choose beans: choose excellent beans that are full and non-traumatic. Generally, the beans that can be bought in the market are all left over, so bean sprouts will take root and sprout in a short time! So choose carefully. Generally, a catty of beans can select about half a catty of good beans! In order to save trouble, you can buy beans directly from the seed shop.
2. Don't let the bean sprouts touch the sun, which will make the bean sprouts grow roots and turn yellow in advance.
3, water frequently every day! Water every 2 hours or so, at night, and the interval should not exceed 8 hours.
Try not to use cold water, but use normal temperature water.
Recommended tools
Kettle: good sealing and water permeability. Disadvantages: manual watering.
Bean sprout machine: automatic watering.
Editing the key points of storage and fresh-keeping control technology
Temperature and humidity control and spontaneous modified atmosphere packaging technology
The optimum storage temperature of bean sprouts is 0 ~ 65438 0℃ and the relative humidity is 95%. In production practice, the circulation temperature of bean sprouts is usually in the range of 0 ~ 65438 00℃. With the decrease of temperature and the extension of storage time, the temperature of circulation environment should be reduced as much as possible. Bean sprouts are easy to freeze because of their high water content, and should not be stored for a long time at a temperature below 0℃. The best gas composition of bean sprouts is still inconclusive. The research shows that the gas environment of 5%O2: and 10%CO2: can effectively prevent bean sprouts from softening, browning and microbial growth. Lu et al. studies show that: adding1%O2; And15% CO2; Conducive to the preservation of mung bean sprouts.
Growth conditions and variety characteristics
How the quality of bean sprouts directly affects the storage time. To produce high-quality bean sprouts, we must control the quality of raw beans, the growth conditions of bean sprouts and their yield. Therefore, first of all, we should grasp the storage of beans for producing bean sprouts and avoid producing bean sprouts with inferior beans; Fertilizer and hormone should not be added in bean sprout production; The growth process of bean sprouts is in water, so water management is very important for obtaining high-quality bean sprouts. Hu Liang and other studies show that when the pH value of the solution is 8.0, the temperature is 25℃ and the time is 6 d, the VC content in soybean sprouts is the highest and the appearance quality is good.
harvest
Mechanical damage during harvesting will obviously shorten the storage time of bean sprouts and cause browning and rot during transportation and sales. Developed countries have special mechanical equipment to harvest bean sprouts, which can realize automatic harvesting. The production scale of bean sprouts in China is different. Although there has been a large-scale mechanized production, a large part of it is still operated by hand. Therefore, we should be careful in harvesting to avoid mechanical damage and ensure product quality.