Fikret KARATAŞ, Ömer MUNZUROĞLU, Nazmi Gür GÜR

Işgın (Rheum ribes L.) bitkisindeki A, E ve C vitaminleri ile selenyum düzeylerinin araştırılması

Özet: Elazığ ve Tunceli yöresinde farklı rakımlarda toplanan taze ışgın (Rheum ribes L) sürgünlerinde ki A, E ve C vitaminleri ile selenyum düzeyleri araştırılmıştır. Vitamin düzeyleri High Performance Li quid Chromatography (HPLC) ile, selenyum miktarı ise florimetre ile tespit edilmiştir. Elde ettiğimiz sonuçlara göre ışgın sürgünlerindeki A, E ve C vitaminleri ile selenyum düzeylerinin sı rasıyla 0,255 ± 0,019 – 0,363 ± 0,015 µg . gr -1, 0,614 ± 0,014 – 0,765 ± 0,021 µg.gr -1, 197,6 ± 10,47 – 282,3 ± 17,46 µg. gr -1, 98,6 ± 6,88 – 141 ± 10,01 µg . kg-1 arasında değiştiği belirlen- miştir. Ayrıca yüksek rakımlı ortamlarda yaşayan bitkilerdeki antioksidan vitamin düzeylerinin düşük rakımlı ortamlarda yaşayanlara göre daha fazla olduğu görülmüştür. Bitkinin bu şekilde strese bağlı ola rak artış gösteren serbest radikallere karşı antioksidan vitamin düzeyini arttırarak mukavemet kazan dığı sonucuna varılmıştır. Materyaldeki Se içeriği ise beslenme açısından yeterli düzeydedir.

A study of levels of vitamins A, E and C and selenium in rhubarb (Rheum ribes L.)

The levels of vitamins A, E and C and selenium in young shoots of Rheum ribes L. collec-ted at various altitudes from Elazığ and Tunceli Basins were examined experimentally. The vitamin le-vels and the amount of selenium were determined by HPLC and fluorometers. It was determined that the levels of A, E and C vitamins and selenium in the young shoots of Rheum ribes L. were in the ranges of 0.255 ± 0.019 - 0.363 ± 0.015 µg.gr -1 , 0.614 ± 0.014 - 0.765 ± 0.021 µg.gr -1 , 197.6 ± 10.47 - 282.3 ± 17.46 µg .gr -1 , 98.6 ± 6.88 - 141 ± 10.01 µg . kg -1 res-pectively. It was found that the amount of antioxidant vitamins in plants growing at high altitudes was higher than that in plants growing at low altitudes. It was concluded that the plants increased their re-sistivity by increasing their antioxidant vitamin levels in opposition to the free radicals increasing with stress. The amount of selenium in the materials was found to be sufficient in terms of nutrition.

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