{"id":3568,"date":"2019-03-11T10:47:19","date_gmt":"2019-03-11T03:47:19","guid":{"rendered":"https:\/\/ahrd.com.vn\/?p=3568"},"modified":"2022-03-17T19:40:17","modified_gmt":"2022-03-17T12:40:17","slug":"nano-sio2-va-kha-nang-ket-kop-voi-chitosan-trong-bao-quan-nong-san","status":"publish","type":"post","link":"https:\/\/ahrd.vn\/?p=3568","title":{"rendered":"Nano SiO2 v\u00e0 kh\u1ea3 n\u0103ng k\u1ebft k\u1ee3p v\u1edbi chitosan trong b\u1ea3o qu\u1ea3n n\u00f4ng s\u1ea3n"},"content":{"rendered":"<p>\u0110i\u00f4x\u00edt silic\u00a0(SiO<sub>2<\/sub>) l\u00e0 m\u1ed9t\u00a0<a title=\"H\u1ee3p ch\u1ea5t\" href=\"https:\/\/vi.wikipedia.org\/wiki\/H%E1%BB%A3p_ch%E1%BA%A5t\">h\u1ee3p ch\u1ea5t h\u00f3a h\u1ecdc<\/a>\u00a0c\u00f2n c\u00f3 t\u00ean g\u1ecdi kh\u00e1c l\u00e0\u00a0silica.\u00a0Trong c\u01a1 th\u1ec3, silic (Si) c\u00f3 trong c\u00e1c m\u00f4 li\u00ean k\u1ebft, x\u01b0\u01a1ng s\u1ee5n v\u00e0 g\u00e2n do Si tham gia qu\u00e1 tr\u00ecnh sinh t\u1ed5ng h\u1ee3p c\u00e1c t\u1ed5 ch\u1ee9c n\u00e0y. C\u01a1 th\u1ec3 ng\u01b0\u1eddi ch\u1ee9a kho\u1ea3ng 1,4g Si, gi\u1ea3m d\u1ea7n theo \u0111\u1ed9 tu\u1ed5i, nh\u01b0ng h\u00e0m l\u01b0\u1ee3ng Si l\u1ea1i \u1ed5n \u0111\u1ecbnh trong c\u00e1c c\u01a1 quan n\u1ed9i t\u1ea1ng. Si \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o c\u01a1 th\u1ec3 qua \u0111\u01b0\u1eddng th\u1ee9c \u0103n, tan r\u1ea5t nhanh v\u00e0 \u0111\u01b0\u1ee3c ph\u00e2n b\u1ed1 \u0111i kh\u1eafp c\u01a1 th\u1ec3. Si c\u00f3 nhi\u1ec1u trong th\u1ee9c \u0103n c\u00f3 ngu\u1ed3n g\u1ed1c th\u1ef1c v\u1eadt (Ole Johnsen v\u00e0 ctv., 2002). Gi\u1edbi h\u1ea1n cho ph\u00e9p c\u1ee7a nano SiO<sub>2\u00a0<\/sub>trong th\u1ef1c ph\u1ea9m: N\u0103m 2003 theo quy \u0111\u1ecbnh c\u1ee7a EU SiO<sub>2\u00a0<\/sub>s\u1eed d\u1ee5ng t\u1ed1i \u0111a 50mg\/kg s\u1ea3n ph\u1ea9m. Theo ti\u00eau chu\u1ea9n th\u1ef1c h\u00e0nh t\u1ed1t s\u1ea3n xu\u1ea5t thu\u1ed1c c\u1ee7a GMP, SiO<sub>2<\/sub>\u00a0gi\u1edbi h\u1ea1n 10g\/kg th\u1ec3 tr\u1ecdng (FAO, 2001).<\/p>\n<p>\u0110\u1ec3 n\u00e2ng cao \u0111\u1eb7c t\u00ednh h\u00f3a l\u00fd c\u1ee7a chitosan \u0111\u1ec3 k\u00e9o d\u00e0i th\u1eddi gian b\u1ea3o qu\u1ea3n cho tr\u00e1i c\u00e2y, s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa v\u1eadt li\u1ec7u h\u1eefa c\u01a1 v\u00e0 v\u00f4 c\u01a1 \u0111\u00e3 \u0111\u01b0\u1ee3c nghi\u00ean c\u1ee9u v\u00e0 mang \u0111\u1ebfn nhi\u1ec1u tri\u1ec3n v\u1ecdng \u0111\u1ec3 n\u00e2ng cao \u0111\u1eb7c t\u00ednh n\u00e0y c\u1ee7a m\u00e0ng bao chitosan, c\u00e1c h\u1ea1t nano \u0111\u00e3 \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng \u0111\u1ec3 t\u0103ng hi\u1ec7u \u1ee9ng k\u00edch th\u01b0\u1edbc v\u00e0 hydroxyl b\u1ec1 m\u1eb7t (Shi v\u00e0 ctv., 2013; Yu v\u00e0 ctv., 2012).<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-3569 size-full\" src=\"https:\/\/ahrd.com.vn\/wp-content\/uploads\/2022\/03\/001.jpg\" alt=\"\" width=\"308\" height=\"187\" \/><\/p>\n<p align=\"center\">(Al-Sagheer v\u00e0 Muslim, 2010)<\/p>\n<p align=\"center\"><strong>H\u00ecnh<\/strong>\u00a0<strong>1.<\/strong>\u00a0S\u01a1 \u0111\u1ed3 ph\u00e1c h\u1ecda s\u1ef1 t\u01b0\u01a1ng t\u00e1c c\u1ee7a h\u1ed7n h\u1ee3p chitosan kh\u1ed1i l\u01b0\u1ee3ng ph\u00e2n t\u1eed th\u1ea5p v\u00e0 nano SiO<sub>2<\/sub><\/p>\n<p>\u00a0 \u00a0 \u00a0SiO<sub>2\u00a0<\/sub>\u0111\u01b0\u1ee3c ch\u1ee9ng minh l\u00e0 c\u00f3 kh\u1ea3 n\u0103ng c\u1ea3i thi\u1ec7n \u0111\u1eb7c t\u00ednh c\u1ee7a chitosan trong b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m (Yu v\u00e0 ctv., 2012). S\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa nano silica v\u00e0 chitosan c\u00f3 th\u1ec3 t\u0103ng c\u01b0\u1eddng kh\u1ea3 n\u0103ng kh\u00e1ng vi sinh v\u1eadt c\u1ee7a l\u1edbp m\u00e0ng bao (Dhanasingth v\u00e0 ctv., 2011), h\u1ea1n ch\u1ebf ho\u1ea1t \u0111\u1ed9ng c\u1ee7a enzyme (Lei v\u00e0 ctv., 2011), \u1ee9c ch\u1ebf s\u00e2u b\u1ec7nh tr\u00ean n\u00f4ng s\u1ea3n (Yan v\u00e0 ctv., 2011). V\u00ec th\u1ebf chitosan k\u1ebft h\u1ee3p v\u1edbi nano silica c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t v\u1eadt li\u1ec7u sinh h\u1ecdc m\u1edbi \u1ee9ng d\u1ee5ng trong b\u1ea3o qu\u1ea3n tr\u00e1i c\u00e2y nh\u1eb1m t\u0103ng tu\u1ed5i th\u1ecd, gi\u1ea3m s\u1ef1 m\u1ea5t n\u01b0\u1edbc, gi\u1ea3m hao h\u1ee5t kh\u1ed1i l\u01b0\u1ee3ng, ng\u0103n ng\u1eeba s\u1ef1 h\u01b0 h\u1ecfng, gi\u1ea3m s\u1ef1 chuy\u1ec3n m\u00e0u c\u1ee7a v\u1ecf qu\u1ea3 trong qu\u00e1 tr\u00ecnh b\u1ea3o qu\u1ea3n (Yan v\u00e0 ctv., 2011; Yu v\u00e0 ctv., 2012).<\/p>\n<p>N\u0103m 2017 \u2013 2018, Trung t\u00e2m Nghi\u00ean c\u1ee9u v\u00e0 Ph\u00e1t tri\u1ec3n N\u00f4ng nghi\u1ec7p C\u00f4ng ngh\u1ec7 cao \u0111\u00e3\u00a0<em>Nghi\u00ean c\u1ee9u \u1ea3nh h\u01b0\u1edfng c\u1ee7a chitosan ph\u00e2n t\u1eed l\u01b0\u1ee3ng th\u1ea5p v\u00e0 nano SiO<sub>2<\/sub>\u00a0\u0111\u1ebfn ch\u1ea5t l\u01b0\u1ee3ng qu\u1ea3 \u1ed5i (Psidium guajava L.) sau thu ho\u1ea1ch nh\u1eb1m k\u00e9o d\u00e0i th\u1eddi gian b\u1ea3o qu\u1ea3n<\/em>. Thu \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 nh\u01b0 sau: Gi\u1ed1ng \u1ed5i \u0110\u00e0i Loan thu ho\u1ea1ch sau 75 \u00b1 2 ng\u00e0y t\u00ednh t\u1eeb l\u00fac n\u1edf hoa, \u0111\u01b0\u1ee3c x\u1eed l\u00fd s\u01a1 b\u1ed9 v\u00e0 bao m\u00e0ng b\u1eb1ng h\u1ed7n h\u1ee3p ch\u1ee9a\u00a02% Chitosan\u00a0(M<sub>W<\/sub>\u00a044,5 kDa)\u00a0v\u00e0 0,02% nano SiO<sub>2<\/sub>\u00a0c\u00f3 t\u1ed1c \u0111\u1ed9 bi\u1ebfn \u0111\u1ed5i m\u00e0u s\u1eafc v\u1ecf qu\u1ea3, \u0111\u1ed9 c\u1ee9ng, h\u00e0m l\u01b0\u1ee3ng Vitamin C, t\u1ef7 l\u1ec7 h\u01b0 h\u1ecfng, t\u1ed5ng ch\u1ea5t r\u1eafn h\u00f2a tan, t\u1ef7 l\u1ec7 hao h\u1ee5t kh\u1ed1i l\u01b0\u1ee3ng gi\u1ea3m ch\u1eadm nh\u1ea5t, ch\u1ea5t l\u01b0\u1ee3ng c\u1ea3m quan t\u1ed1t, th\u1eddi gian b\u1ea3o qu\u1ea3n l\u00e2u, kho\u1ea3ng 8 ng\u00e0y khi b\u1ea3o qu\u1ea3n \u1edf 30 \u00b1 2<sup>o<\/sup>C, 80 \u00b1 5% RH v\u00e0 kho\u1ea3ng 12 ng\u00e0y khi b\u1ea3o qu\u1ea3n \u1edf 15 \u00b1 1<sup>o<\/sup>C, 80 \u00b1 5% RH g\u1ea7n g\u1ea5p \u0111\u00f4i so v\u1edbi nghi\u1ec7m th\u1ee9c \u0110C\u00a0(\u0110\u1ed1i ch\u1ee9ng) kh\u00f4ng x\u1eed l\u00fd bao m\u00e0ng.<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-3570 size-full\" src=\"https:\/\/ahrd.com.vn\/wp-content\/uploads\/2022\/03\/002.jpg\" alt=\"\" width=\"499\" height=\"240\" \/><\/p>\n<p style=\"text-align: center;\">\u00a0 \u00a0 \u00a0<strong>H\u00ecnh\u00a02.<\/strong>\u00a0H\u1ed7n h\u1ee3p chitosan + nano SiO<sub>2<\/sub><\/p>\n<table style=\"height: 328px;\" border=\"0\" width=\"900\" cellspacing=\"1\" cellpadding=\"0\" align=\"center\">\n<tbody>\n<tr>\n<td><img decoding=\"async\" loading=\"lazy\" class=\"size-full wp-image-3571 aligncenter\" src=\"https:\/\/ahrd.com.vn\/wp-content\/uploads\/2022\/03\/003.jpg\" alt=\"\" width=\"278\" height=\"208\" \/><\/td>\n<td><img decoding=\"async\" loading=\"lazy\" class=\"size-full wp-image-3572 aligncenter\" src=\"https:\/\/ahrd.com.vn\/wp-content\/uploads\/2022\/03\/04.jpg\" alt=\"\" width=\"280\" height=\"210\" \/><\/td>\n<\/tr>\n<tr>\n<td><strong>\u00a0 \u00a0 \u00a0 \u00a0H\u00ecnh 3. <\/strong>M\u1eabu \u1ed5i \u0110C sau 6 ng\u00e0y\u00a0\u1edf\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 15 \u00b1 1<sup>o<\/sup>C, 80 \u00b1 5% RH<\/td>\n<td><strong>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0H\u00ecnh 4. <\/strong>M\u1eabu \u1ed5i x\u1eed l\u00fd bao m\u00e0ng chitosan + nano SiO<sub>2<\/sub>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0sau 6 ng\u00e0y b\u1ea3o qu\u1ea3n \u1edf 15 \u00b1 1<sup>o<\/sup>C, 80 \u00b1 5% RH<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>\u0110i\u00f4x\u00edt silic\u00a0(SiO2) l\u00e0 m\u1ed9t\u00a0h\u1ee3p ch\u1ea5t h\u00f3a h\u1ecdc\u00a0c\u00f2n c\u00f3 t\u00ean g\u1ecdi kh\u00e1c l\u00e0\u00a0silica.\u00a0Trong c\u01a1 th\u1ec3, silic (Si) c\u00f3 trong c\u00e1c m\u00f4 li\u00ean k\u1ebft, x\u01b0\u01a1ng s\u1ee5n v\u00e0 g\u00e2n do Si tham gia qu\u00e1 tr\u00ecnh sinh t\u1ed5ng h\u1ee3p c\u00e1c t\u1ed5 ch\u1ee9c n\u00e0y. C\u01a1 th\u1ec3 ng\u01b0\u1eddi ch\u1ee9a kho\u1ea3ng 1,4g Si, gi\u1ea3m d\u1ea7n theo \u0111\u1ed9 tu\u1ed5i, nh\u01b0ng h\u00e0m l\u01b0\u1ee3ng Si [&#8230;]\n","protected":false},"author":50,"featured_media":3569,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[300],"tags":[],"_links":{"self":[{"href":"https:\/\/ahrd.vn\/index.php?rest_route=\/wp\/v2\/posts\/3568"}],"collection":[{"href":"https:\/\/ahrd.vn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ahrd.vn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ahrd.vn\/index.php?rest_route=\/wp\/v2\/users\/50"}],"replies":[{"embeddable":true,"href":"https:\/\/ahrd.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3568"}],"version-history":[{"count":4,"href":"https:\/\/ahrd.vn\/index.php?rest_route=\/wp\/v2\/posts\/3568\/revisions"}],"predecessor-version":[{"id":3587,"href":"https:\/\/ahrd.vn\/index.php?rest_route=\/wp\/v2\/posts\/3568\/revisions\/3587"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ahrd.vn\/index.php?rest_route=\/wp\/v2\/media\/3569"}],"wp:attachment":[{"href":"https:\/\/ahrd.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3568"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ahrd.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3568"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ahrd.vn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3568"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}