{"id":3420,"date":"2022-12-10T05:18:43","date_gmt":"2022-12-09T22:18:43","guid":{"rendered":"http:\/\/www.tneutron.net\/blogs\/vitamin-a\/"},"modified":"2022-12-06T14:17:43","modified_gmt":"2022-12-06T07:17:43","slug":"vitamin-a","status":"publish","type":"post","link":"https:\/\/www.tneutron.net\/blogs\/vitamin-a\/","title":{"rendered":"Vitamin A"},"content":{"rendered":"
\n

Vitamin A hanya terdapat dalam tubuh hewan,seperti minyak ikan, hati dn lain-lainnya. Tetapi dlam tumbuh-tumbuhan terdapat semacam zat yang menyerupai vitamin A biasa disebut Karotin. Karotin ini setelah tiba didalam hati,diubah menjadi vitamin A karena itu, karotin disebut juga sebagai pro vitamin A.<\/p>\n

Vitamin A pada umumnya stabil terhadap panas, asam, dan alkali. Namun vitamin ini mempunyai sifat yang sangat mudah teroksidasi oleh udara dan akan rusak bila dipanaskan pada suhu tinggi.<\/p>\n<\/div>\n

a) Fungsi vitamin A bagi tubuh.<\/b> <\/span><\/span><\/div>\n
– Sebagai bahan untuk membuat rodopsin yang diperlukan dalam prosse penglihatan.
\n– Untuk pemeliharaan jaringan pelapis.
\n– Untuk membantu proses pertumbuhan tubuh.<\/div>\n
\u00a0<\/span><\/span>\"clip_image001\"<\/a><\/div>\n
Gambar 2.35: Sumber vitamin A <\/span><\/span><\/div>\n
<\/div>\n
b) Vitamin A Dalam Bahan Makanan<\/b> <\/span><\/span><\/div>\n
Dalam bahan makanan terdapat vitamin A adalah bentuk karoten sebagai ester dari vitamin A dan sebagai vitamin A bebas. Keaktifan biologis karoten jauh lebih rendah dibandingkan dengan vitamin A. Karena karoten merupakan sumber utama vitamin A bagi masyarakat di negara yang sedang berkembang, maka absorpsi dan ketersediaan karoten perlu diketahui. Vitamin A dalam bahan makanan dinyatakan dalam satu kesatuan yang disebut kesatuan internasional ( disingkat ki ) yaitu sebanyak 0.6 mikrogram beta karotin.<\/div>\n
\u00a0<\/span><\/span>\"clip_image002\"<\/a><\/div>\n
\n

Gambar 2.36: Bahan makanan kaya karoten<\/p>\n

Ada hubungan langsung antara derajat kehijauan sayuran dengan kadar karoten. Semakin hijau daun tersebut semakin tinggi kadar karotennya, sedang daun-daun yang pucat seperti selada dan kol, labu siam, miskin akan karoten.<\/p>\n<\/div>\n

\u00a0<\/span><\/span>\"clip_image003\"<\/a><\/div>\n
\n

Gambar 2.37: Sayuran miskin karotin<\/p>\n

Dari penelitian yang dilakukan diketahui bahwa kemampuan tubuh menyerap karoten yang berasal dari sayuran hanya 33 \u2013 58% atau rata-rata 50%. Tidak semua karoten yang terserap tersebut dapat diubah menjadi vitamin A.<\/p>\n<\/div>\n

\u00a0<\/span><\/span>\"clip_image005\"<\/a><\/div>\n
Gambar 2. 38: Sayuran kaya karotin\u00a0<\/span><\/span><\/div>\n","protected":false},"excerpt":{"rendered":"

Vitamin A hanya terdapat dalam tubuh hewan,seperti minyak ikan, hati dn lain-lainnya. Tetapi dlam tumbuh-tumbuhan terdapat semacam zat yang menyerupai<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[17],"tags":[3002,3004,3005,3010,3003,3009,3906,3008,3006,3007],"class_list":["post-3420","post","type-post","status-publish","format-standard","hentry","category-gizi-yang-dibutuhkan-tubuh","tag-vitamin-a","tag-vitamin-a-benefits","tag-vitamin-a-deficiency","tag-vitamin-a-deficiency-symptoms","tag-vitamin-a-foods","tag-vitamin-a-for-acne","tag-vitamin-a-for-skin","tag-vitamin-a-palmitate","tag-vitamin-a-swimwear","tag-vitamin-a-toxicity"],"yoast_head":"\nVitamin A - TN Blogs<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.tneutron.net\/blogs\/vitamin-a\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Vitamin A - TN Blogs\" \/>\n<meta name=\"twitter:description\" content=\"Vitamin A hanya terdapat dalam tubuh hewan,seperti minyak ikan, hati dn lain-lainnya. 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