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12-04

2024

The difference between golden pomfret and white pomfret.

The white pomfret and the golden pomfret are both popular varieties of pomfret. In fact, their nutritional value is quite similar. In terms of appearance, the golden pomfret is generally larger, so it's important to distinguish between the two when purchasing. Which is better, the white pomfret or the golden pomfret? The nutritional components of the white pomfret and the golden pomfret are similar. Both the golden pomfret and the pomfret are highly nutritious ingredients on the dining table. There is no definitive conclusion as to which is more nutritious; the nutritional components of these two types of fish are comparable, so eating either one is a good opportunity to supplement nutrition. The most obvious difference between the golden pomfret and the white pomfret is their size: the golden pomfret grows quickly and is generally seen weighing around 1 pound in the market, while the white pomfret grows very slowly, taking two years to reach half a pound. Nowadays, it is rare to find a 1-pound white pomfret in the market. In terms of appearance, there are also significant differences between the golden pomfret and the white pomfret, but they require careful observation. There are three main points: the length-to-width ratio of the golden pomfret is between 1.5 and 2 times, while the white pomfret has a length-to-width ratio of less than 1.5, resembling a diamond shape; secondly, the golden pomfret has hard spines on its dorsal fin, while the white pomfret is smooth; finally, the vent of the golden pomfret is located at the middle back of the body, while the white pomfret's vent is located at the middle front of the body. These subtle differences require careful observation! Which is more expensive, the white pomfret or the golden pomfret? The prices are similar, but if one must say which is more expensive, it would be the white pomfret. Why is that? It turns out that pomfret is a fish with a very "picky" appetite; it has high standards for feed selection and generally does not eat common feed, and it is not very fond of eating. Therefore, the white pomfret usually does not grow very large, taking two years to reach half a pound, and it is now very difficult to find a 1-pound white pomfret in the market.

12-04

2024

Does frozen food lose its nutrients?

What are frozen foods? Frozen foods, also known as quick-frozen foods, are foods produced by rapidly freezing at low temperatures. Frozen foods refer to raw materials that are appropriately processed and then quickly frozen within 15 minutes, allowing their temperature to rapidly pass through the range of -1°C to -5°C (also known as the maximum ice crystal formation zone) within 30 minutes. After freezing, the food crystallizes, and the storage and transportation temperature must also be below -18°C. In a super low-temperature environment, the food is quickly frozen, and the structure of tissues and cells does not change, while the activity of microorganisms, enzymes, etc., is temporarily suppressed. The food is then sealed and vacuum-packed (to prevent drying, oil loss, oxidation, etc.) and finally stored in an environment below -18°C for long-term preservation, lasting 300 to 600 days. Many people often confuse quick-freezing with freezing, but in fact, the two concepts are completely different. Do frozen foods lose their nutritional components? Meat stored at lower temperatures can better retain its nutritional components. In particular, the content of protein and minerals generally does not change. It can be said that compared to fresh meat, frozen meat does not have significant nutritional losses, aside from a decline in taste. Compared to fresh fruits and vegetables, frozen fruits and vegetables may have a slightly worse taste, but their nutritional value is not necessarily lower. This is because fruits and vegetables lose nutrients during the processes of harvesting, transportation, and storage, while frozen fruits and vegetables are quickly frozen at -18°C right after harvesting, which almost halts respiration and suppresses microbial activity, thus better preserving nutrients. Many vegetables are frozen for transportation and storage, and there are many types of vegetables suitable for quick freezing, including leafy vegetables, stem vegetables, root vegetables, and edible fungi. Before quick freezing, vegetables must undergo pre-treatment, which can include boiling, steaming, or microwaving. An experiment comparing the nutritional components of eggplants, green beans, garlic sprouts, and cabbage under quick-frozen and room temperature storage conditions found that in the early stages of storage, the vitamin C content of quick-frozen vegetables was lower than that of room temperature stored vegetables. However, as the storage days increased, the vitamin C content of room temperature stored vegetables rapidly decreased, quickly falling below that of quick-frozen vegetables. How to choose frozen foods First, choose frozen foods that have been stored at temperatures below -18°C. If the store does not have a freezer or if the freezer's temperature does not reach -18°C, the product quality cannot be guaranteed and should not be purchased. Select frozen foods that are closest to the production date. Pay attention to the production date; the closer the food is to the production date, the higher its freshness and the less nutrient loss it has. If frozen foods have not undergone thawing during production and transportation, there will be no water generated, and thus no frost or ice will appear. Only during repeated thawing will frost and ice form, which can also cause varying degrees of damage to the food's nutrients. Therefore, we should prioritize frost-free and ice-free frozen foods. Choose packaging that is undamaged, with intact frozen products that are not soft or stuck together, minimal frost inside the packaging, and products that have a natural color without discoloration or dullness.

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