VITAMIN What is a vitamin A Vitamin A
- Slides: 12
VITAMIN
What is a vitamin A ? � Vitamin A is known as retinol and occurs only in animal products. � Plants have a yellowish dye known as beta. Carotene (provitamin) which in animal cells can be easily split into two molecules of vitamin A.
RETINOL C 20 H 29 OH BETA-CAROTENE C 40 H 56
Features : � soluble in fat � relatively stable � sensitive to the light � sensitive to oxygen (administered with vitamin E which is antioxidant)
Effect on the organism � play an important role in vision, bone growth, reproduction, cell differentiation and cell division. � helps regulate the immune system which helps prevent or fight off infections by making white blood cells that destroy harmful bacteria and viruses. � help lymphocytes fight infections more effectively.
Absorption Better absorption of vitamin A will give us: -the presence of fat -vitamin D -complex vitamins of the B group -vitamin C -vitamin E -calcium -zinc -phosphorus Worse absorption of vitamin A: -sodium benzoate, -vitamin D -deficiency, -caffeine, -nicotine, -alcohol, -nitrites, -steroids -laxatives, -damaged pancreas.
Application � Medicine In the treatment of: -acne -Stretch marks -dyskeratosis -psoriasis -photoaging of the skin -lack of vitamin A In cosmetiscs -creams -lotions These cosmetiscs are very helpful for people with skin problems. �
Sources of vitamin A � � � � egg butter cod-liver oil cheese whole milk fish meat spinach grapes carrote yellow pumpkin tomatos avocado
The effects of overdose: � liver abnormality (symptoms of poisoning) � central � birth nervous system disorders defects � reduced bone mineral density that may result in osteoporosis
The effects of deficiency � skin changes � respiratory infections � anemia and apathy � increased intracranial pressure � night blindness � damaged cornea of eye � inhibition of growth
Sources of knowledge: � � � � http: //www. witaminaa. com. pl/wchlanianie-witaminaa/ http: //portal. abczdrowie. pl/naturalne-wystepowaniewitamin http: //www. biotechnologia. uni. opole. pl/biblioteka/doc s/WITAMINY-PRAWDA-I-MITY. pdf http: //forumsportowe. us/viewtopic. php? t=179 http: //www. nhs. uk/Conditions/vitaminsminerals/Pages/Vitamin-A. aspx http: //jejzdrowie. pl/dzialanie-witaminy-a Claude A. Villee- „Biologia” Phil Bradfield and Steve Potter -LONGMAN GCSE Biology
The presentation was done by: � Weronika Kielar � Karolina Grzeszek � Magdalena Adamowicz � Karolina Kurys THANK YOU FOR YOUR ATTENTION
