In many people's minds, fruits should be as fresh as possible, and therefore, they should be eaten as soon as possible. However, Professor Feng Shuangqing, a fruit and vegetable storage expert from the College of Food Science and Nutritional Engineering at China Agricultural University, told the Life Times reporter. Some fruits are not the best when they have just been bought or just picked. This is because some fruits are quickly and completely softened once they are mature and cannot be transported and stored. Therefore, they must be removed in a “hard state†before they can be fully matured before they can be transported safely to supermarkets. Compared with other fruits, these fruits need a "after-ripening" process.
Kiwi. Press gently on both ends of the kiwi fruit with your fingertips. If you feel no longer hard, slight deformation occurs at the pressing area, but it is not very soft. At this time, it is the best edible state of the kiwifruit. For kiwifruit, the popular saying among fruit growers is that “3 days are soft, 7 days are bad, and half are half badâ€. Therefore, kiwi fruit with firm fruit and no mechanical damage should be selected at the time of purchase. However, hard-state kiwifruit is not delicious. The sugar content is very low, and the fruit is sour. It also makes people feel burrs. Because the fruit contains a lot of proteases, it will decompose the protein in the tongue and oral mucosa, causing discomfort. At room temperature, kiwifruit generally softens for about 3 days to reach the best edible state. In order to speed up the maturation, the kiwi fruit can be put together with the already matured banana. In this way, the “ethylene†natural ripening gas emitted from the cooked fruit will “infect†the kiwifruit and promote its maturation. If you want to preserve it for longer, you can put the kiwi into the refrigerator freezer, and low temperature can delay its maturation.
banana. The color of the skin turns completely yellow, and at the same time there is a strong fruity smell. At this time, the banana is best eaten. However, bananas are very easy to darken, so you can choose to be a little more creative when you buy. In general, bananas with "green shoulders" are kept at room temperature and can be eaten within 1 to 2 days. To speed up the maturation, you can put it together with the cooked apple. If you want to stay a little longer, you can hang it up and keep it well ventilated, so that the produced ethylene can be dispersed with the wind, delaying the aging of the banana.
Nanguo pear. Pressing Nanguo Pears with your finger, if you can feel elastic, smell a strong aroma of wine, this time is the best time to eat Nanguo pear. Nanguo Pear has obvious "after-ripening" characteristics, and it takes more than one week's natural fermentation to achieve the best food after picking. It should be noted that when the Nanguo Pear is preserved, the plastic bag cannot be tied too tightly and the fruit should leave a "breathing mouth" so as to maintain the "activity" of Nanguo Pear. Put the Nanguo pear in the refrigerator freezer to slow the breathing of the fruit and keep it fresh.
persimmon. "Soft" and "not astringent" are important signs of mature persimmons, but such persimmons are not conducive to harvesting, transportation and storage. Immature persimmons contain a large amount of soluble tannic acid (tannic acid), and the tannins have a strong astringency. They stimulate the tactile nerve endings in the mouth to produce excitement and give people a "stringy" feeling. If the raw persimmon is isolated from the air, it will produce organic substances such as acetaldehyde and acetone. These organic substances can turn the tannins dissolved in water into substances that are difficult to dissolve in water. Such persimmons do not have astringency when eaten. Therefore, the raw persimmon is placed in a plastic bag, and the mouth of the bag is fastened. After a few days, it can be astringent and sweet.
Avocado. Press the surface of the avocado with your hand. If you feel elastic and the flesh is firm, it is proven that the avocado has matured. The more dark brown spots on the green surface, the more ripe the avocado, but the skin is basically covered with dark and light brown spots. It is recommended not to buy it, indicating that it may be over cooked and deteriorated. If it is not the same day to eat, it is recommended to buy avocados that are relatively raw. Such fruits will mature naturally after 2 to 3 days at room temperature. The matured avocado can be stored in the refrigerator freezer for about a week.
1. Smart battery indicator
This product is designed with four high-brightness LED indicators. When discharging or charging, it can automatically recognize the status and indicate the power. When the battery is in the off state, short press the button. The LED indicates that the power is about 2S and then turns off.
2. Battery life
When the number of uses reaches 150 times, the power indicator LED lights turn red to indicate power, indicating that the battery life has been reached, and the user can use it accordingly.
3 smart alarm charging
During the charging process, the battery detects the status in real time and warns of charging overload, overcurrent and overheating.
4. Intelligent low voltage alarm
When the battery is in the state of discharge, when the voltage is detected to be low (only 3.7V), it comes with a buzzer alarm to remind, stop discharging,. And the alarm goes off.
5. Smart storage function
When the battery is at a high level for a long time and is not in use, it will automatically start the intelligent storage function and discharge to the storage voltage to ensure battery storage safety.
6. Automatic sleep function
When the battery is on and not in use, it will automatically turn off after 3 minutes to save battery power.
7.Software update function
This product has a software update function, you can connect the computer through the USB port or update the software through the mobile app to update the battery software.
8. Data communication function
This product is designed with two communication methods at the same time: USB serial communication and WiFi communication; Both methods can be used to get real-time battery information such as current voltage, current, battery usage, etc.; Flight Control can also establish a connection to this to communicate.
9. Battery record function
This product is designed with a unique logging function that can store and store data for the entire life of the battery. Battery log information includes cell voltage, current, battery temperature, number of cycles, number of abnormal states, etc. User can connect battery to view via mobile phone APP.
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