Trong khi \u0111un n\u1ea5u \u1edf gia \u0111\u00ecnh, kh\u00f4ng \u00edt ng\u01b0\u1eddi cho l\u01b0\u1ee3ng l\u1edbn d\u1ea7u \u0111\u1ec3 r\u00e1n, chi\u00ean th\u1ef1c ph\u1ea9m. Sau \u0111\u00f3 l\u1ea1i ch\u1eaft ri\u00eang d\u1ea7u \u0111\u00e3 qua chi\u00ean, r\u00e1n c\u00f2n d\u01b0 \u0111\u1ec3 l\u1ea7n kh\u00e1c l\u1ea1i d\u00f9ng x\u00e0o n\u1ea5u l\u1ea1i, d\u00f9ng c\u00e1ch n\u00e0y c\u00f3 th\u1ec3 ti\u1ebft ki\u1ec7m d\u1ea7u, nh\u01b0ng theo quan \u0111i\u1ec3m v\u1ec7 sinh lo\u1ea1i d\u1ea7u \u0111\u00e3 qua chi\u00ean, r\u00e1n kh\u00f4ng n\u00ean d\u00f9ng \u0111\u1ec3 chi\u00ean, r\u00e1n l\u1ea1i nhi\u1ec1u l\u1ea7n.<\/p>\n\n\n\n
Th\u00e0nh ph\u1ea7n d\u1ea7u ch\u00ednh l\u00e0 c\u00e1c este c\u1ee7a axit b\u00e9o. Khi \u0111em d\u1ea7u chi\u00ean r\u00e1n d\u01b0\u1edbi \u0111i\u1ec1u ki\u1ec7n nhi\u1ec7t \u0111\u1ed9 cao, \u0111\u00e3 ph\u00e1t sinh nhi\u1ec1u bi\u1ebfn \u0111\u1ed5i kh\u00f4ng ch\u1ec9 ph\u00e1 ho\u1ea1i gi\u00e1 tr\u1ecb dinh d\u01b0\u1ee1ng c\u1ee7a d\u1ea7u b\u00e9o m\u00e0 c\u00f2n sinh ra nhi\u1ec1u ch\u1ea5t \u0111\u1ed9c \u1ea3nh h\u01b0\u1edfng nhi\u1ec1u \u0111\u1ebfn s\u1ee9c kho\u1ebb th\u1eadm ch\u00ed g\u00e2y \u0111\u1ed9c h\u1ea1i.<\/p>\n\n\n\n
Theo c\u00e1c k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u, khi \u0111un n\u00f3ng d\u1ea7u \u0103n \u1edf nhi\u1ec7t \u0111\u1ed9 200 – 300\u00b0C, ch\u00ed \u00edt s\u1ebd g\u00e2y ra 3 lo\u1ea1i bi\u1ebfn \u0111\u1ed5i: m\u1ed9t l\u00e0 d\u01b0\u1edbi t\u00e1c d\u1ee5ng nhi\u1ec7t ph\u00e2n, este glyxerit (ch\u1ea5t b\u00e9o nh\u01b0 d\u1ea7u, m\u1ee1) b\u1ecb ph\u00e2n gi\u1ea3i th\u00e0nh an\u0111ehyt, xeton, c\u00e1c an\u0111ehyt, cacboxylic, este an\u0111ehyt c\u00f9ng nhi\u1ec1u ph\u00e2n t\u1eed nh\u1ecf kh\u00e1c. C\u00e1c h\u1ee3p ch\u1ea5t n\u00e0y kh\u00f4ng ch\u1ec9 l\u00e0m cho d\u1ea7u c\u00f3 m\u00f9i kh\u00f3 ng\u1eedi m\u00e0 c\u00f2n \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ee9c kho\u1ebb. Ngo\u00e0i ra c\u00f2n c\u00f3 hai lo\u1ea1i bi\u1ebfn \u0111\u1ed5i kh\u00e1c l\u00e0: l\u1edbp d\u1ea7u b\u00ean trong thi\u1ebfu oxy so v\u1edbi l\u1edbp d\u1ea7u b\u00ean ngo\u00e0i nhi\u1ec1u oxy do qu\u00e1 tr\u00ecnh oxy ho\u00e1, s\u1ebd c\u00f3 t\u00e1c d\u1ee5ng t\u1ee5 h\u1ee3p l\u1ea1i h\u00ecnh th\u00e0nh m\u1ed9t t\u1eadp h\u1ee3p l\u1edbn c\u00e1c ph\u00e2n t\u1eed. Trong c\u00e1c t\u1eadp h\u1ee3p ph\u00e2n t\u1eed n\u00e0y c\u00f3 nh\u1eefng t\u00edch t\u1ee5 g\u00e2y \u0111\u1ed9c m\u00e3n t\u00ednh cho c\u01a1 th\u1ec3. B\u1ea5y gi\u1edd \u0111\u1ed9 nh\u1edbt c\u1ee7a d\u1ea7u t\u0103ng l\u00ean, nhi\u1ec7t \u0111\u1ed9 b\u1ed1c ch\u00e1y t\u0103ng cao, d\u1ea7u t\u1eeb tr\u1ea1ng th\u00e1i trong su\u1ed1t bi\u1ebfn th\u00e0nh \u0111\u1eb7c qu\u00e1nh, \u0111\u1ec3 l\u1eafng th\u00e0nh l\u1edbp ch\u1ea5t r\u1eafn \u1edf b\u00ean d\u01b0\u1edbi. \u0110\u00f3 l\u00e0 ti\u00eau ch\u00ed \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 \u0111\u1ed9c h\u1ea1i c\u1ee7a d\u1ea7u n\u00ean c\u1ea7n ph\u1ea3i b\u1ecf \u0111i.<\/p>\n\n\n\n
C\u1ea7n ph\u1ea3i n\u00f3i th\u00eam r\u1eb1ng, kh\u00f4ng nh\u1ea5t thi\u1ebft ph\u1ea3i lo\u1ea1i b\u1ecf to\u00e0n b\u1ed9 m\u1ed9t n\u1ed3i d\u1ea7u l\u1edbn, m\u00e0 ch\u1ee7 y\u1ebfu l\u00e0 kh\u00f4ng n\u00ean d\u00f9ng d\u1ea7u \u0111\u1ec3 chi\u00ean r\u00e1n qu\u00e1 nhi\u1ec1u l\u1ea7n, kh\u00f4ng n\u00ean \u0111\u1ec3 d\u1ea7u \u0111\u00e3 t\u00edch l\u1ea1i qu\u00e1 l\u00e2u \u0111em d\u00f9ng. Khi \u0111\u1ed9 nh\u1edbt c\u1ee7a d\u1ea7u \u0111\u00e3 qu\u00e1 cao v\u00e0 ng\u00e0y c\u00e0ng \u0111\u1eb7c qu\u00e1nh, t\u00ednh l\u01b0u \u0111\u1ed9ng \u0111\u00e3 gi\u1ea3m nhi\u1ec1u th\u00ec n\u00ean ng\u1eebng s\u1eed d\u1ee5ng. \u1ede \u0111\u1ea7u c\u00e1c \u0111\u01b0\u1eddng ph\u1ed1 nh\u1ecf th\u01b0\u1eddng c\u00f3 c\u00e1c s\u1ea1p h\u00e0ng nh\u1ecf d\u00f9ng d\u1ea7u \u0111\u1ec3 r\u00e1n b\u00e1nh, d\u1ea7u l\u1ea1i \u0111\u1ed5 ti\u1ebfp v\u00e0o d\u1ea7u, d\u1ea7n d\u1ea7n ph\u1ea9m ch\u1ea5t c\u1ee7a d\u1ea7u gi\u1ea3m d\u1ea7n, nh\u01b0ng h\u1ea7u nh\u01b0 h\u1ecd kh\u00f4ng ngh\u0129 \u0111\u1ebfn vi\u1ec7c thay b\u1eb1ng d\u1ea7u m\u1edbi. R\u00f5 r\u00e0ng lo\u1ea1i d\u1ea7u n\u00e0y kh\u00f4ng n\u00ean ti\u1ebfp t\u1ee5c d\u00f9ng \u0111\u1ec3 r\u00e1n th\u1ee9c \u0103n.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: D\u1ea7u \u0103n.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
Trong khi \u0111un n\u1ea5u \u1edf gia \u0111\u00ecnh, kh\u00f4ng \u00edt ng\u01b0\u1eddi cho l\u01b0\u1ee3ng l\u1edbn d\u1ea7u \u0111\u1ec3 r\u00e1n, chi\u00ean th\u1ef1c ph\u1ea9m. Sau \u0111\u00f3 l\u1ea1i ch\u1eaft ri\u00eang d\u1ea7u \u0111\u00e3 qua chi\u00ean, r\u00e1n c\u00f2n d\u01b0 \u0111\u1ec3 l\u1ea7n kh\u00e1c l\u1ea1i d\u00f9ng x\u00e0o n\u1ea5u l\u1ea1i, d\u00f9ng c\u00e1ch n\u00e0y c\u00f3 th\u1ec3 ti\u1ebft ki\u1ec7m d\u1ea7u, nh\u01b0ng theo quan \u0111i\u1ec3m v\u1ec7 sinh lo\u1ea1i d\u1ea7u […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[8,15],"tags":[],"class_list":["post-8104","post","type-post","status-publish","format-standard","hentry","category-hoa-hoc","category-hoi-dap-khoa-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/8104","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=8104"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/8104\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=8104"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=8104"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=8104"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}