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0 Referat tpar CHIMIEtpar tpar tpar tpar Vitamineletpar Stpardtplain tltrpartql tli0tri0tidctlpartaspalphataspnumtfaautotadjustrig
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httrin0tlin0titap0 trtlchtfcs1 taf0tafs20talang1025 tltrchtfcs0 tf36tfs32tlang1033tlangfe1033tcgridtlangnp1033tlan
gfenp1033 Itrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs24tcf1tinsrsid14222641tcharrsid10186030 ttab Vitaminele sunt substante organice care, in cantitati foarte mici, indeplinesc in organismul animal functiuni specifice si vitale. SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs24tcf1tlang1036tlangfe1033tlangnp1036tinsrsi
d14222641tcharrsid10186030 Ele nu produc energie ca hidratii de carbon sau grasimile si nu sunt utilizate ca material plastic pentru constructia celulei ca proteinele, dar sunt esentiale pentru cresterea si mentinerea sanatatii omului si animalelor.tpar ttab Vitaminele pot fi sintetizate de plante si microorganisme si nu pot fi sintetizate de organismul animal. Lipsa lor din hrana duce la imbolnaviri grave avitaminoze. Unele intra in compozitia enzimelor si functioneaza sub forma de coenzime.tpar ttab O clasificare a lor se face dupa felul solubilitatii in apa hidrosolubile B,C,etc. si solubilitatii lor in lipide liposolubile A,D,E,K,etc..tpar Vitamine liposolubiletpar Vitamina A poate fi identificata sub forma uleioasa cu acid tricloracetic, cand da o coloratie galbena care vireaza spre albastru.tpar Substante necesare solutie uleioasa de vitamina A, 0.1mg solutie cloroformica de acid tricloracetic 30.tpar Experienta. Se iau intr-o eprubeta 0.5ml solutie de vitamina A si 1ml solutie acid tricloracetic. SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs24tcf1tinsrsid14222641tcharrsid10186030 Aparitia unei coloratii galbene care vireaza spre albastru indica prezenta vitaminei A. tpar ttab Reactia Pacinitpar Substante necesare solutie uleioasa de vitamina A, 0.1mg fenol tendash cristale gaiacol tendash cristale acid clorhidric concentrat clorura de hidrogen cloroform.tpar SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs24tcf1tlang1036tlangfe1033tlangnp1036tinsrsi
d14222641tcharrsid10186030 Experienta. Se adauga intr-o eprubeta, peste 0.5ml solutie de vitamina A, un cristal de gaiacol, un cristal de fenol, 1ml de acid clorhidric si 5-6ml cloroform. Se agita bine si se observa aparitia unei coloratii rosie purpurie.tpar Identificarea vitaminei si provitaminei A in alimentetpar Substante necesare galbenus de ou radacina de morcov solutie de clorura de stibiu.tpar Experienta 1. Intr-o eprubeta se pun 1-2ml solutie de clorura de stibiu, peste care se adauga o bucatica de galbenus de ou de marimea unui bob de mazare. Se agita eprubeta de cateva ori, dupa care se scoate galbenusul de ou. Solutia ramasa se va colora in albastru. tpar Experienta 2. O bucatica de radacina de morcov contine provitamina A se striveste cu spatula pe o hartie de filtru, astfel ca zeama sa fie absorbita de hartie, dupa care se usuca la o flacara. Peste pata formata se lasa sa cada o picatura de solutie de clorura de stibiu. Apare o coloratie albastra verzuie.tpar Vitamina D.tpar Identificarea vitaminei d calciferolultpar In prezenta anilinei si acidului clorhidric, vitaminele D dau o coloratie rosie. tpar Substante necesare solutie de anilina acid clorhidric 11 in volum solutie uleioasa de vitamina D.tpar Experienta. Intr-o eprubeta, peste cca 2ml solutie uleioasa vitamina D, se adauga 10 picaturi dolutie anilina HCl. Se obtine o coloratie rosie.tpar Reactia Carr-Price.tpar Avand in molecula duble legaturi conjugate, vitamina D da colorati ca si polienele cu acizii tari cu o solutie saturata de clorura de stibiu si cloroform.tpar Substante necesare solutie cloroformica de clorura de stibiu 30 solutie cloroformica de vitamina D 0.5mg.tpar Experienta. Se toarna in eprubeta 1ml solutie vitamina D, peste care se pun cateva picaturi din solutia de stibiu . Dupa agitare cu o bagheta de sticla apare o coloratie galben- portocalie care atinge intensitatea maxima dupa cca 10 minute.tpar Vitamina E.tpar Identificarea vitaminei E.tpar Prezentand un nucleu benzenic si, legat de acesta, o grupare oxidril, ca si fenolii, vitamina E da reactie pozitiva cu clorura ferica. tpar Substante necesare solutie alcoolica de vitamina E 0.1mg solutie de clorura ferica 10.tpar Experienta. Intr-o eprubeta se toarna 1ml solutie uleioasa de vitamina E, peste care se adauga 4-5 picaturi de clorura ferica. Prin agitarea eprubetei, apare o coloratie galben-rosiatica.tpar Vitamina E este oxidata de acidul azotic pana la structura parachinonica de culoare rosie.tpar Substante necesare solutie uleioasa de vitamina E 30mg1ml acid azotic nitric alcool.tpar Experienta. Intr-o eprubeta se toarna 1ml solutie uleioasa de vitamina E la care se adauga 8-10 picaturi de acid azotic. Se incalzeste amestecul ...
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