1、 Select the type of sweet corn:

The types of sweet corn are divided into ordinary sweet type and super sweet type. The sugar content of ordinary sweet corn is about 10-15%, with good waxiness, which is suitable for all kinds of fried vegetables. The sugar content of super sweet corn is about 15-22%, with little dry matter and no waxiness. It is more suitable for fresh food or making drinks. Because super sweet sweet corn has high sugar content, diabetics usually control their consumption. Whether it is ordinary sweet corn or super sweet corn, the key to its quality lies in its tenderness rather than sweetness, that is, the harvest time. The harvest time of sweet corn is very strict, especially that of ordinary sweet corn. The harvest time is from the 19th to 20th days after silking. The quality of corn will drop significantly from the 21st to 22nd days, and it will be waste after 23 days. The harvest time of super sweet corn will be 3-5 days looser than that of ordinary sweet corn, but the quality drop is also obvious. Sweet corn is planted in late April every year, and the growth period after emergence is about 75-80 days. The harvest period of sweet corn is generally from late July to early August, which is the rainy season, which brings great difficulty to the harvest of sweet corn. Thunderstorm, gale or hail weather are often encountered during harvest, so it is sometimes difficult to harvest high-quality sweet corn.

The reason why sweet corn is nutritious is that it contains a variety of vitamins like fruit, so sweet corn cannot be stored. After harvest, it must stop processing within a limited time. Generally, it must be processed into waste within 5-8 hours, otherwise it will lose its unique business.

2、 Sweet corn with different processing methods

The processing methods of sweet corn are divided into quick freezing and canned. Quick freezing is to thresh the newly harvested sweet corn. After cleaning, it is immediately reduced to minus 46 ℃ by the fluidized quick freezer, and then stored in the cold storage. This processing method has the advantages of small nutrient loss, long storage time and good quality. However, some quick-frozen sweet corn sold is not quick-frozen, but slow-frozen in the cold storage. It is a fake "quick-frozen". The slow-frozen sweet corn grains will form ice crystals, with great nutritional loss and poor taste. When we choose quick-frozen sweet corn kernels, we only need to freeze one or two corn kernels in our hands to see if we can turn out some water. There will be no water in the quick-frozen corn kernels.

The defect of quick-frozen sweet corn is that the old and tender corn kernels are difficult to observe. Generally, it only depends on the size of corn kernels. If the corn kernels exceed the harvest time, they will grow a lot, and the relatively small ones should be tender. Consumers should look at the brand and try not to buy those bulk products. The quality of bulk corn kernels is certainly not guaranteed. Therefore, try to choose quick-frozen sweet corn from quick-frozen sweet corn manufacturers.

Canning is the processing of sweet corn kernels into cans, including iron tinned cans, glass bottled cans and soft packaged cans. Because the vitamins in sweet corn will be synthesized after seeing light, the canned sweet corn in glass bottle has a great nutritional loss and lost its unique nutritional value. Canned iron cans and canned sweet corn in aluminum foil bags have less nutritional loss, no secondary pollution, long shelf life and relatively good quality.

As mentioned earlier, the key to the quality of sweet corn lies in its tenderness. In order to increase production, some consumer manufacturers ignore the quality of sweet corn and harvest overdue. What's more, they use waxy corn or feed corn as sweet corn to process cans. Its quality is incredible. Canned sweet corn can't see the contents, so consumers can only identify the brand to buy. It is worth mentioning that since there are no national or industrial norms, consumer enterprises are implementing their own enterprise norms. Even if they use feed corn to consume canned sweet corn, the inspection results may be qualified. After buying canned sweet corn, consumers open it and taste it. If there is no sweet, crisp and tender taste, it is actually fake or overdue sweet corn. Such sweet corn has no edible value.