Why is winter jujube called winter jujube?

Winter jujube generally ripens naturally in the solar calendar from 65438+ 10 to 165438+ 10. Because the weather in the north entered the cold earlier, it was named "Winter Jujube". Dongzao (also known as Yanlaihong, Apple Jujube, Rock Sugar Jujube, Huanghua Dongzao, Miaoshang Dongzao and Zhanhua Dongzao) is a high-quality late-maturing fresh food species in northern Shandong.

Winter jujube belongs to Rhamnaceae, Zizyphus. It is an excellent late-maturing fresh-eating spinless jujube variety. Distributed in Shanxi, Hebei and Shandong. The biggest feature of winter jujube is its extremely high vitamin C content, which is as high as 380 ~ 600 mg per 100 g pulp.

Dongzao is a cultivated variety of jujube tree. Originated in Xiawa Town, Zhanhua District, Binzhou City, Shandong Province, it is an excellent late-maturing spinless fresh jujube variety and is also recognized as the best fresh jujube variety. The average fruit weight is 17.5g, and the maximum fruit weight can reach 25g. It looks like an apple and is called "little apple". The skin is red and bright, thin and crisp, sweet and fragrant, rich in nutrition, and the edible rate is 95%.

Extended data

nutritional ingredient

Vitamin c content is high. Fresh jujube has the reputation of "natural vitamin C pill". The vitamin C content in 100g fresh jujube is as high as 243 mg, which is about 4 times that of kiwifruit and more than 8 times that of citrus. It is particularly worth mentioning that the vitamin C content of jujube is as high as 900 mg/100 g, which is 2~3 times that of other fresh jujubes.

Rich in minerals, such as potassium, phosphorus, calcium, magnesium, iron and so on. Contains malic acid, catechuic acid, tartaric acid and other functional components, which is helpful to inhibit the growth and reproduction of cancer cells;

Cyclic adenosine monophosphate has the functions of regulating immunity, inhibiting asthma and preventing cardiovascular diseases; Flavonoids such as rutin, Sophora flavescens and anthocyanin have the effects of scavenging free radicals, delaying aging, lowering blood pressure and reducing blood lipid. But the sugar content of fresh jujube is as high as 20%~30%, and the glycemic index is also high. People with diabetes should eat less and eat a handful every day.

References:

People's Daily Online-People's Health Online-Fresh jujube families have their own characteristics: pear dates are full and juicy, winter dates are sweet and sour, and green dates are thick and small.

References:

Baidu Encyclopedia-Dongzao