{"id":2833,"date":"2023-09-14T14:11:04","date_gmt":"2023-09-14T06:11:04","guid":{"rendered":"http:\/\/www.pgeneral.com\/?p=2833"},"modified":"2024-02-22T14:19:21","modified_gmt":"2024-02-22T06:19:21","slug":"calcium-testing-in-food","status":"publish","type":"post","link":"https:\/\/www.pgeneral.com\/vi\/ung-dung\/food-and-drugs\/calcium-testing-in-food\/","title":{"rendered":"Ki\u1ec3m tra canxi trong th\u1ef1c ph\u1ea9m"},"content":{"rendered":"

Canxi r\u1ea5t c\u1ea7n thi\u1ebft trong s\u1ef1 co c\u01a1, k\u00edch ho\u1ea1t t\u1ebf b\u00e0o tr\u1ee9ng, x\u00e2y d\u1ef1ng x\u01b0\u01a1ng v\u00e0 r\u0103ng m\u1ea1nh, \u0111\u00f4ng m\u00e1u, xung th\u1ea7n kinh, truy\u1ec1n, \u0111i\u1ec1u ch\u1ec9nh nh\u1ecbp tim v\u00e0 c\u00e2n b\u1eb1ng ch\u1ea5t l\u1ecfng trong c\u00e1c t\u1ebf b\u00e0o.
\nCho r\u1eb1ng canxi l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 vi m\u00f4 quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u01a1 th\u1ec3 con ng\u01b0\u1eddi, n\u1ed9i dung canxi tuy\u00ean b\u1ed1 tr\u00ean nh\u00e3n th\u1ef1c ph\u1ea9m \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong ti\u1ebfp th\u1ecb.
\nTheo CFR (m\u00e3 quy \u0111\u1ecbnh c\u1ee7a li\u00ean bang, Ti\u00eau \u0111\u1ec1 21, CHPT 1, Ph\u1ea7n 101 - Ghi nh\u00e3n th\u1ef1c ph\u1ea9m), \u2018HighClaims (ORICH trong H\u1ed3i, Ngu\u1ed3n tuy\u1ec7t v\u1eddi c\u1ee7a H\u1ed3i) c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng tr\u00ean nh\u00e3n v\u00e0 trong vi\u1ec7c ghi nh\u00e3n th\u1ef1c ph\u1ea9m, ngo\u1ea1i tr\u1eeb m\u1ed9t s\u1ed1 s\u1ea3n ph\u1ea9m b\u1eefa \u0103n v\u00e0 c\u00e1c s\u1ea3n ph\u1ea9m ch\u00ednh \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh, v\u1edbi \u0111i\u1ec1u ki\u1ec7n l\u00e0 th\u1ef1c ph\u1ea9m c\u00f3 th\u00eam 20 %.<\/p>\n

\"\"<\/p>\n

H\u00ecnh 1 l\u01b0\u1ee3ng tham chi\u1ebfu \u0103n ki\u00eang cho canxi.<\/p>\n

Do \u0111\u00f3, vi\u1ec7c th\u1eed nghi\u1ec7m canxi trong th\u1ef1c ph\u1ea9m l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t th\u1ef1c ph\u1ea9m.<\/p>\n

Nguy\u00ean t\u1eafc chung c\u1ee7a th\u1eed nghi\u1ec7m<\/p>\n

Sau khi ti\u00eau h\u00f3a, th\u00eam dung d\u1ecbch lanthanum nh\u01b0 m\u1ed9t t\u00e1c nh\u00e2n ph\u00e1t h\u00e0nh.
\nThi\u1ebft b\u1ecb v\u00e0 thu\u1ed1c th\u1eed
\nThi\u1ebft b\u1ecb:<\/p>\n

M\u00e1y quang ph\u1ed5 h\u1ea5p th\u1ee5 AA990 ho\u1eb7c A3
\nC\u00e2n b\u1eb1ng ph\u00e2n t\u00edch (m\u1ee9c 1mg v\u00e0 0,1mg)<\/p>\n

H\u1ec7 th\u1ed1ng ti\u00eau h\u00f3a l\u00f2 vi s\u00f3ng: H\u1ec7 th\u1ed1ng ti\u00eau h\u00f3a vi s\u00f3ng Topex+, Ph\u00e2n t\u00edch Persee, v\u1edbi c\u00e1c t\u00e0u Teflon
\nT\u1ea5m n\u00f3ng (n\u00f3ng l\u00ean \u0111\u1ebfn 200C)<\/p>\n

Thu\u1ed1c th\u1eed:<\/p>\n

\"\"<\/p>\n

Thu\u1ed1c th\u1eed<\/p>\n

Dung d\u1ecbch axit nitric (5+95): Th\u00eam n\u01b0\u1edbc 950ml v\u00e0o axit nitric 50ml, l\u1eafc \u0111\u1ec1u.
\nDung d\u1ecbch Lantan (20g\/L): L\u1ea5y 23,45g Lantan oxit, th\u00eam m\u1ed9t \u00edt n\u01b0\u1edbc, sau \u0111\u00f3 th\u00eam 75mL axit clohydric (1+1) \u0111\u1ec3 h\u00f2a tan. Chuy\u1ec3n dung d\u1ecbch v\u00e0o b\u00ecnh \u0111\u1ecbnh m\u1ee9c v\u00e0 \u0111\u1ecbnh m\u1ee9c \u0111\u1ebfn 1000mL.<\/p>\n

L\u00e0m gi\u1ea3i ph\u00e1p ti\u00eau chu\u1ea9n<\/p>\n

Dung d\u1ecbch canxi chu\u1ea9n (1000mg\/L): l\u1ea5y 2,4963g (m\u1ee9c 0,0001g) canxi cacbonat, th\u00eam axit clohydric (1+1) \u0111\u1ec3 h\u00f2a tan, sau \u0111\u00f3 \u0111\u1ecbnh m\u1ee9c \u0111\u1ebfn 1000mL.
\nDung d\u1ecbch chu\u1ea9n canxi (100mg\/L): l\u1ea5y dung d\u1ecbch chu\u1ea9n canxi g\u1ed1c (1000mg\/L) v\u00e0o b\u00ecnh \u0111\u1ecbnh m\u1ee9c; th\u00eam dung d\u1ecbch axit nitric (5+95) \u0111\u1ebfn th\u1ec3 t\u00edch kh\u00f4ng \u0111\u1ed5i th\u00e0nh 100mL.
\nGi\u1ea3i ph\u00e1p ti\u00eau chu\u1ea9n canxi \u0111\u1ec3 th\u1eed nghi\u1ec7m: L\u00e0m cho gi\u1ea3i ph\u00e1p ti\u00eau chu\u1ea9n th\u1eed nghi\u1ec7m l\u00e0m c\u00f4ng th\u1ee9c d\u01b0\u1edbi \u0111\u00e2y:<\/p>\n

\"\"<\/p>\n

*N\u1ed3ng \u0111\u1ed9 ti\u00eau chu\u1ea9n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eeda \u0111\u1ed5i trong c\u00e1c th\u00ed nghi\u1ec7m th\u1ef1c t\u1ebf.<\/p>\n

Chu\u1ea9n b\u1ecb m\u1eabu<\/p>\n

\u0110i\u1ec1u tr\u1ecb m\u1eabu th\u00f4<\/p>\n

Ng\u0169 c\u1ed1c v\u00e0 \u0111\u1eadu<\/p>\n

Lo\u1ea1i b\u1ecf \u0111\u00e1 kh\u00f4ng mong mu\u1ed1n v\u00e0 c\u1ecf.<\/p>\n

Rau, tr\u00e1i c\u00e2y, c\u00e1, th\u1ecbt<\/p>\n

R\u1eeda m\u1eabu b\u1eb1ng n\u01b0\u1edbc v\u00e0 \u0111\u1ec3 kh\u00f4.
\n\u0110\u1ed3 u\u1ed1ng, r\u01b0\u1ee3u vang, gi\u1ea5m, n\u01b0\u1edbc s\u1ed1t, d\u1ea7u \u0103n, s\u1ea3n ph\u1ea9m s\u1eefa<\/p>\n

L\u1eafc m\u1eabu t\u1ed1t.<\/p>\n

Ti\u00eau h\u00f3a m\u1eabu<\/p>\n

V\u1ec1 c\u01a1 b\u1ea3n, c\u00f3 b\u1ed1n ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ec3 ti\u00eau h\u00f3a:<\/p>\n

Ph\u01b0\u01a1ng ph\u00e1p l\u00e0m n\u00f3ng \u01b0\u1edbt<\/p>\n

L\u1ea5y m\u1eabu r\u1eafn 0,2-3g (\u0111\u1ebfn 0,001g m\u1ee9c) ho\u1eb7c m\u1eabu ch\u1ea5t l\u1ecfng 0,500 -5,00mL v\u00e0o chai l\u1ecd ho\u1eb7c th\u1ee7y tinh ti\u00eau h\u00f3a, th\u00eam axit nitric 10ml, axit perchloric 0,5ml.
\nm\u00e0u v\u00e0ng.
\nM\u1eabu x\u1ea3 ra b\u1eb1ng n\u01b0\u1edbc v\u00e0 th\u1ec3 t\u00edch kh\u00f4ng \u0111\u1ed5i \u0111\u1ebfn 25ml.
\nNgo\u00e0i ra, l\u00e0m th\u1eed nghi\u1ec7m tr\u1ed1ng th\u1eed.<\/p>\n

 <\/p>\n

Ti\u00eau h\u00f3a l\u00f2 vi s\u00f3ng<\/p>\n

L\u1ea5y m\u1eabu 0,2-0,8g (\u0111\u1ebfn m\u1ee9c 0,001g) ho\u1eb7c 0,500mL -3,00ml m\u1eabu ch\u1ea5t l\u1ecfng v\u00e0o b\u00ecnh ti\u00eau h\u00f3a vi s\u00f3ng v\u00e0 th\u00eam axit nitric 5ml.<\/p>\n

\"\"<\/p>\n

Sau khi ngu\u1ed9i, l\u00e0m bay h\u01a1i axit tr\u00ean \u0111\u0129a n\u00f3ng (140-160) \u0111\u1ebfn 1ml.<\/p>\n

C\u00e1c th\u00f4ng s\u1ed1 ki\u1ec3m tra m\u1eabu tr\u00ean thi\u1ebft b\u1ecb<\/p>\n

\"\"<\/p>\n

V\u00ed d\u1ee5 \u0111\u01b0\u1ee3c ki\u1ec3m tra<\/p>\n

Canxi trong rau l\u00e1 xanh<\/p>\n

\"\"<\/p>\n

K\u1ebft qu\u1ea3 d\u1ef1 ki\u1ebfn:<\/p>\n

\"\"\"\"<\/p>\n

Canxi trong tr\u00e1i c\u00e2y kh\u00f4<\/p>\n

\"\"\"\"\"\"<\/p>\n

 
\n