{"id":4120,"date":"2020-01-21T11:44:50","date_gmt":"2020-01-21T03:44:50","guid":{"rendered":"https:\/\/taizyfoodmachines.com\/?p=4120"},"modified":"2023-09-01T16:00:56","modified_gmt":"2023-09-01T08:00:56","slug":"can-uv-sterilized-foods-be-eaten","status":"publish","type":"post","link":"https:\/\/taizyfoodmachines.com\/vi\/can-uv-sterilized-foods-be-eaten\/","title":{"rendered":"Th\u1ef1c ph\u1ea9m \u0111\u01b0\u1ee3c ti\u1ec7t tr\u00f9ng b\u1eb1ng UV c\u00f3 th\u1ec3 \u0103n \u0111\u01b0\u1ee3c kh\u00f4ng?"},"content":{"rendered":"
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4.6\/5 - (10 \u0111\u00e1nh gi\u00e1) <\/div> <\/div>

Tia c\u1ef1c t\u00edm c\u00f3 th\u1ec3 ti\u00eau di\u1ec7t vi khu\u1ea9n v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng g\u00e2y ung th\u01b0 nh\u1ea5t \u0111\u1ecbnh. V\u1eady, th\u1ef1c ph\u1ea9m \u0111\u01b0\u1ee3c x\u1eed l\u00fd b\u1eb1ng m\u00e1y ti\u1ec7t tr\u00f9ng UV<\/a> c\u00f3 th\u1ec3 \u0103n \u0111\u01b0\u1ee3c kh\u00f4ng?<\/p>

Tia c\u1ef1c t\u00edm \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a l\u00e0 b\u1ee9c x\u1ea1 \u0111i\u1ec7n t\u1eeb c\u00f3 b\u01b0\u1edbc s\u00f3ng t\u1eeb 10 nm \u0111\u1ebfn 400 nm. Tuy nhi\u00ean, trong c\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf, b\u01b0\u1edbc s\u00f3ng s\u1eed d\u1ee5ng th\u01b0\u1eddng tr\u00ean 100 nanomet. UVA v\u1edbi b\u01b0\u1edbc s\u00f3ng t\u1eeb 315 \u0111\u1ebfn 409 nanomet th\u01b0\u1eddng l\u00e0m r\u00e1m da. UVB v\u1edbi b\u01b0\u1edbc s\u00f3ng t\u1eeb 280 \u0111\u1ebfn 315 nanomet c\u00f3 th\u1ec3 l\u00e0m b\u1ecfng da v\u00e0 l\u00e0m t\u0103ng nguy c\u01a1 ung th\u01b0 da. UVC v\u1edbi b\u01b0\u1edbc s\u00f3ng t\u1eeb 200 \u0111\u1ebfn 280 nm c\u00f3 th\u1ec3 ti\u00eau di\u1ec7t hi\u1ec7u qu\u1ea3 vi khu\u1ea9n v\u00e0 virus. Tia c\u1ef1c t\u00edm c\u00f3 b\u01b0\u1edbc s\u00f3ng t\u1eeb 100 \u0111\u1ebfn 200 nanomet b\u1ecb h\u1ea5p th\u1ee5 b\u1edfi oxy trong kh\u00f4ng kh\u00ed. Do \u0111\u00f3, ph\u01b0\u01a1ng ph\u00e1p ti\u1ec7t tr\u00f9ng b\u1eb1ng tia c\u1ef1c t\u00edm truy\u1ec1n th\u1ed1ng s\u1eed d\u1ee5ng b\u01b0\u1edbc s\u00f3ng 254 nanomet.<\/p>

When UV rays are absorbed by bacteria or viruses, they can damage DNA and make them lose their ability to proliferate. In terms of sterilization results, it is the same as heating or treating with chemicals. However, the method of sterilization by ultraviolet rays does not destroy the nutritional components without heating. Because DNA is not a nutrient for food and those molecules that the body needs are not destroyed. In addition, it does not destroy the natural flavor of the food. After all, chemical fungicides or preservatives introduce new substances, and sometimes bring some “odors”. The DNA molecules destroyed by ultraviolet rays will be decomposed into the human body without generating harmful substances.<\/p>

\"Ultraviolet
Quang ph\u1ed5 tia c\u1ef1c t\u00edm<\/figcaption><\/figure>

Do \u0111\u00f3, m\u1eb7c d\u00f9 tia c\u1ef1c t\u00edm c\u00f3 kh\u1ea3 n\u0103ng g\u00e2y ung th\u01b0, th\u1ef1c ph\u1ea9m x\u1eed l\u00fd b\u1eb1ng tia c\u1ef1c t\u00edm kh\u00f4ng g\u1eb7p v\u1ea5n \u0111\u1ec1 v\u1ec1 an to\u00e0n.<\/p>

Any food processing method will have a certain degree of “damage” to the food. Compared with the most conventional heating, the damage of UV treatment is much smaller. For some foods that want to stay “natural”, such as fruit juice, it has a great advantage.<\/p>

Kh\u1ea3 n\u0103ng ti\u1ec7t tr\u00f9ng b\u1eb1ng UV ph\u1ee5 thu\u1ed9c kh\u00f4ng ch\u1ec9 v\u00e0o b\u01b0\u1edbc s\u00f3ng m\u00e0 c\u00f2n v\u00e0o n\u0103ng l\u01b0\u1ee3ng m\u00e0 th\u1ef1c ph\u1ea9m nh\u1eadn \u0111\u01b0\u1ee3c khi chi\u1ebfu x\u1ea1. N\u0103ng l\u01b0\u1ee3ng c\u00e0ng th\u1ea5p, hi\u1ec7u qu\u1ea3 ti\u1ec7t tr\u00f9ng c\u00e0ng k\u00e9m. \u1ede b\u01b0\u1edbc s\u00f3ng 254 nm \u0111\u00e3 ch\u1ecdn, hi\u1ec7u qu\u1ea3 ti\u1ec7t tr\u00f9ng v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 n\u0103ng l\u01b0\u1ee3ng th\u1ec3 hi\u1ec7n d\u1ea1ng h\u00ecnh ch\u1eef S k\u00e9o d\u00e0i.<\/p>

Ultraviolet sterilization is difficult to achieve such as complete killing by heating or chemical sterilants. Decreasing 4 logarithms is usually used as the “sterilization standard”, that is, one in 10,000 bacteria survive. The pasteurization of fresh milk-processed at 72 degrees Celsius for 15 seconds-usually decreases by 5 logarithms, meaning that at most only one in 100,000 bacteria survive. In the case of ultra-high temperature sterilization of milk at room temperature, the reduced logarithmic value is more than 12 and almost no bacteria can survive.<\/p>

\"UV
N\u01b0\u1edbc \u00e9p di\u1ec7t khu\u1ea9n UV<\/figcaption><\/figure>

Different microorganisms have different sensitivities to ultraviolet rays, some of which will be killed in large quantities at lower energy intensities, while others require higher energy. Taking the reduction of 4 logarithmic values as a standard, some of the bacteria detected in the study only required tens of joules per square meter of energy, while others required more than 300 joules per square meter. We don’t know which bacteria are present in the food, and how many of them are, so we always target the most tenacious one and destroy the others by the way. Therefore, the energy intensity for UV sterilization needs to be above 400 Joules per square meter.<\/p>

Hi\u1ec7n t\u1ea1i, c\u00f3 ba lo\u1ea1i \u1ee9ng d\u1ee5ng ch\u00ednh c\u1ee7a ti\u1ec7t tr\u00f9ng UV<\/a> trong ng\u00e0nh c\u00f4ng nghi\u1ec7p th\u1ef1c ph\u1ea9m:<\/p>

Th\u1ee9 nh\u1ea5t l\u00e0 kh\u1eed tr\u00f9ng c\u00e1c d\u1ee5ng c\u1ee5 ch\u1ee9a th\u1ef1c ph\u1ea9m ho\u1eb7c thi\u1ebft b\u1ecb ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m. \u0110\u1ed1i v\u1edbi c\u00e1c d\u1ee5ng c\u1ee5 ho\u1eb7c thi\u1ebft b\u1ecb, vi sinh v\u1eadt lu\u00f4n t\u1ed3n t\u1ea1i tr\u00ean b\u1ec1 m\u1eb7t, v\u00e0 \u0111i\u1ec3m y\u1ebfu c\u1ee7a kh\u1ea3 n\u0103ng xuy\u00ean s\u00e1ng k\u00e9m c\u1ee7a UV l\u00e0 kh\u00f4ng li\u00ean quan. C\u00e1c l\u1ee3i th\u1ebf c\u1ee7a vi\u1ec7c kh\u00f4ng c\u1ea7n l\u00e0m n\u00f3ng v\u00e0 kh\u00f4ng c\u1ea7n th\u00eam c\u00e1c ch\u1ea5t kh\u00e1c (bao g\u1ed3m n\u01b0\u1edbc) \u0111\u01b0\u1ee3c t\u1eadn d\u1ee5ng t\u1ed1i \u0111a.<\/p>

The second is the pretreatment of food processing water. Compared with the “chemical means” of adding chlorine or chloride, UV sterilization without the introduction of chemicals can avoid the risks of sterilization by-products and the odor caused by germicides.<\/p>

Third, at present, the main food that is directly sterilized by ultraviolet is fruit juice. The flavor of fruit juice can be easily changed by heating, so “non-thermal processing” is attractive in fruit juice production. The name of the fungicide makes consumers dislike it, so UV sterilization that does not change the flavor and does not introduce “chemical ingredients” has a great use.<\/p>

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Ultraviolet rays can kill bacteria and have a certain carcinogenic ability. So, can the food processed by the UV sterilizer be eaten? Ultraviolet is defined as electromagnetic radiation with a wavelength between 10 nm and 400 nm. However, in practical applications, the wavelength used is generally above 100 nanometers. UVA with a wavelength between 315 […]<\/p>\n","protected":false},"author":1,"featured_media":4122,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[46],"tags":[3080],"class_list":["post-4120","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-food-sterilization"],"views":1,"_links":{"self":[{"href":"https:\/\/taizyfoodmachines.com\/vi\/wp-json\/wp\/v2\/posts\/4120","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/taizyfoodmachines.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/taizyfoodmachines.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/taizyfoodmachines.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/taizyfoodmachines.com\/vi\/wp-json\/wp\/v2\/comments?post=4120"}],"version-history":[{"count":0,"href":"https:\/\/taizyfoodmachines.com\/vi\/wp-json\/wp\/v2\/posts\/4120\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/taizyfoodmachines.com\/vi\/wp-json\/wp\/v2\/media\/4122"}],"wp:attachment":[{"href":"https:\/\/taizyfoodmachines.com\/vi\/wp-json\/wp\/v2\/media?parent=4120"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/taizyfoodmachines.com\/vi\/wp-json\/wp\/v2\/categories?post=4120"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/taizyfoodmachines.com\/vi\/wp-json\/wp\/v2\/tags?post=4120"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}