â–¡ Yu Huixing â— Rumors â— Litchi is called detached branches in ancient times. In Xi Shangma’s “Shanglin Fuâ€, there is a “divergenceâ€, and it can be seen that people at that time have realized that the fruit cannot leave the leaves. Bai Juyi of the Tang Dynasty vividly stated in the “Lychee Pictorial Sequence†that the lychee “if it is separated from this branch, it will change color on a day, and it will change on the second day and become fragrant on the third day. After four or five days, the color and flavor will go.†". Litchi is rich in nutrients, sweet in taste, and expensive in a "fresh". The color, smell and taste of the “away from the branches†will quickly change. In ancient times, only litchi was cut off to prolong its preservation period. Lying away from the origin of litchi can not help people think of thousands of things: a ride on a red dumplings laugh, no one knows to lychee; put a small mouth cans, bamboo seals ... These have become a tragedy material. Until now, research on the preservation of litchi and other fruits has been deepening. From litchi fruit tissue structure, physiological activities after picking, internal and external factors causing skin browning, and selection of preservation methods, etc., research results have been frequent, such as air-conditioned storage and preservation, radiation preservation, and ozone preservation technology... Also, many lychees on the market have often been soaked in "fresh water", which sounds scary. The refrigerated foods of the eight children began when they were picked from litchi. Lychee is usually harvested at eight ripenings and placed directly into a foam box with an ice pack, refrigerated, stored, and refrigerated until it enters the family refrigerator and maintains the entire cold chain. Similar operations such as Yangmei's delicate fruits are similar to cold chain operations such as fresh milk and cold meat. Some merchants that do not have refrigerator sales conditions will put some ice cubes to sell in bulk litchi (of course, more will be “naked salesâ€). If the ice is turned into water and the lychee is soaked in ice water, the sanitation situation is not optimistic. As a result, many people will worry about the soaking of water in litchi is not the so-called "preservation water"? Is there any lychee in the market that has been soaked and sprayed with fresh water? â— Technology rumor â— Is there any "preservation water"? Consumers' general concerns about "preserving fresh water" can be summed up in three aspects: Is it useful? Is it compliant? Security is not safe? In fact, "fresh water" is just a common name. According to some media reports, some traders use "preserved water" which is "added with traces of sulfuric acid or hydrochloric acid," "diluted formaldehyde and sulfur dioxide," "citric acid and salt mixed water," "insurance powder (low sodium sulfite, also known as Sodium dithionite)" and so on. From the perspective of preservation technology, "preservation of fresh water" belongs to the chemical agent treatment and preservation method. As soon as they heard the word chemical, some people felt that they were using drugs and would be inexplicably nervous. Because in the concept of ordinary consumers, the scope of chemical agents is very broad, sulfuric acid, hydrochloric acid, sulfur dioxide, formaldehyde, sodium dithionite, citric acid, these are medicines, it is certainly not good to use more. Thus, using these psychological traits of consumers, certain rumors are “born at the right timeâ€. The use of "preservation water" specification In fact, from the point of view of action, sulfur dioxide, sodium hyposulfite itself is a bleach, preservatives, antioxidants; diluted formaldehyde has a preservative effect; citric acid used as a food additive is mainly an acidity regulator, but it also has antioxidant and antiseptic effects. Minor sulfuric acid or hydrochloric acid can reduce the pH of litchi. Studies have shown that in the early browning of the litchi skin, the red of the peel can be restored or partially restored by soaking the acid solution. In general, traders can soak and spray these “preserved waters†to preserve their shelf life as soon as they are preserved, and to make red litchi look good. Some media reporters also purchased samples of litchi for inspection. Dilute sulphuric acid, dilute hydrochloric acid, sulphur dioxide and formaldehyde were not detected. Therefore, “if lychee is treated with sulphur dioxide or hydrochloric acid, there will be irritating odors and it will easily cause deterioration of the flesh. For the traders, it is not worth the candle. These rumours are mostly rumors. However, such test results are generally "responsible only for the sample," or it may not be very common to justify the use of "preservative water," but the use of "preservative water" cannot be completely ruled out. Secondly, from the perspective of compliance, the "Standard for the Use of Food Additives" stipulates that sulfur dioxide, sodium hyposulfite (in addition to potassium metabisulfite, sodium metabisulfite, sodium sulfite, and sodium hydrogen sulfite) can be used for "surface-treated fresh fruit." The upper limit of sulphur dioxide residue is 0.05 g/kg, and this amount of use belongs to the scope of sulphur preservation and preservation. Citric acid is "appropriate for use in various foods according to production needs." Of course, the prerequisite for the use of any raw material is that its quality must meet food hygiene standards, and industrial raw materials are absolutely prohibited for use in food. Of course, there are some abuses that are inevitable. It has been found that industrial insurance powder processing candied dates. As for formaldehyde, it is notorious in the food industry and it is not said. Sulfuric acid, which is a disfiguring tool, is terribly scary. It is impossible to use it in foods even if it is dilute sulfuric acid. In fact, hydrochloric acid is also an acidity regulator in food additives. Agents, but only for use in mayonnaise, salad dressings, of course, can not be used on lychee, and it is used in an out-of-range range. Is "preservative water" safe? The above mentioned six substances (sulphuric acid, hydrochloric acid, sulfur dioxide, formaldehyde, sodium dithionite, and citric acid) that allow the food to “keep fresh†can be used in three ways (sulfur dioxide, sodium dithionite, and citric acid) as required. Sex does not have to say much. The remaining sulfuric acid, hydrochloric acid, and formaldehyde must not be used, but what if it is used? It should be noted that even if a trader uses sulfuric acid, hydrochloric acid, or formaldehyde to “preserve freshness,†it is generally “adding trace amounts of diluted sulfuric acid, hydrochloric acid, and formaldehyde, and it is unlikely to be used in high concentrations. On the other hand, a large concentration will adversely affect the recovery of the red skin, and secondly, it will have a pungent odor. Excessive litchi residues will tend to have sourness so that our senses can be identified. All things are poisonous, the key to see the dose. It is meaningless to leave doses for toxicity. Litchi is a fresh fruit and its taste is extremely “sensitiveâ€. Litchi should not be eaten in large quantities, eating more susceptible to "litchi disease" - sudden consumption of litchi after the sudden emergence of low blood sugar, medically known as litchi acute poisoning. What we condemn is overdosing, overreaching, unscientific use of food additives and the illegal addition of non-edible substances, but there is no need to exaggerate the impact of “preservation water†on physical health. As for the circle of friends, the lychees soaked in syrup will have fever, and it may cause hand-foot-mouth disease, etc., which is nonsense. It is true to buy lychee and try to buy it in a fresh-keeping cabinet or a store with ice cubes. Naturally, there is no need to use "fresh-keeping water" for cold storage. When you buy it, you need to smell it, wash it before you eat it, try it, and you can't go wrong. (The author of this article is the author of "Alive to understand additives" Orthopedic Instruments,Arthroscopy Electric Drill,Arthroscopy Forceps,Endoscopic Surgical System ZHEJIANG SHENDASIAO MEDICAL INSTRUMENT CO.,LTD. , https://www.sdsmedtools.com
"Fresh water" bubble litchi, can not eat?