In addition to being directly supplied to the market, sweet corn ears need to be processed quickly to maintain the high sugar content and freshness of sweet corn. Sweet corn products include: canned sweet corn, frozen sweet corn, dehydrated sweet corn, sweet corn drinks, and the like.
The main equipment for canned sweet corn canned sweet corn can be: vacuum sealing machine, steam sandwich pot, autoclave and so on. Process technology points:
(1) Raw materials: It is required to harvest sweet corn ears with moderate maturity, and the particles are tender and full;
(2) peeling and silk removal: it is required to remove the outer skin and silk;
(3) Degranulation: It is an important part of the process. It uses machine threshing. When operating, it is necessary to adjust the center hole of the tool in time to ensure the integrity of the sweet corn kernels and clean the thresher in time;
(4) Cleaning: wash away the broken sweet corn kernels and residual silk and impurities;
(5) Pre-cooking: It is a key process of processing, which aims to inhibit enzyme activity and sterilization in sweet corn and maintain the unique color of sweet corn. The sweet corn kernels can generally be placed in water at 90-95 ° C for about 5 minutes. Followed by canning, soup filling, vacuum sealing, 37 ° C insulation inspection, labeling, finished product storage and other processes. At present, canned sweet corn has only corporate standards, and national standards have not yet been formulated. The former part of the frozen sweet corn kernels is similar to the canned sweet corn. The pre-cooked sweet corn kernels are vibrated and drained, and then enter the quick freezing process. When freezing, it should pass the largest ice crystal formation zone of 0~5°C in a very short time. After cooling, the temperature of the sweet corn kernels that have been frozen by the quick-freezing machine must be below -18°C to facilitate storage and transportation. Weighing, packaging, inspection, packing and other processes are carried out in the packaging room below 10 °C. Finally, it is sent to a low temperature storage at -18 ° C for storage. The sweet corn ear of sweet corn ear is not resistant to storage, and the production unit is generally harvested on the same day and processed on the same day. If the processing speed cannot keep up, sweet corn ears can be sent to the cold storage for storage, and the storage temperature is preferably 0-4 °C. The rapid decline of sugar content and the thickening of seed coat are the main phenomena of quality deterioration after harvesting of sweet corn, which is caused by the consumption of sugar by sugar and the conversion of sugar to starch. According to the literature, it can keep fresh for 6-8 days at 0 °C. If the O2 and CO2 gas concentrations in the storage environment are changed, the shelf life of sweet corn can be effectively extended. Modified atmosphere preservation methods, including plastic film packaging and polysaccharide coating. Chitosan obtained from chitin can prevent spoilage and cause hypoxic respiration due to its good film forming and biochemical properties. It is non-toxic, tasteless and easy to decompose. It has become an ideal coating material for the preservation of fruits and vegetables.
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