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  • Küçük Resim
    Öğe
    Determination of Multi-Elemental Analysis and Antioxidant Activities of Helichrysum arenarium (L.) Moench Species
    (Hacettepe University, 2023) Umaz, Adil; Umaz, Kader; Aydın, Fırat; Aydın, Işıl
    In this study, multi-elemental analysis and antioxidant activity of samples belonging to two different populations of Helichrysum arenarium (L.) Moench known as the immortal flower was determined. The results obtained were compared among themselves. Ca, Mg, Al, Fe, Na, Li, Be, B, Ti, Cr, Ni, Zn, Mo, and Pb element contents of the sample belonging to the B population were determined that be higher than that of the other population. The K, V, Mn, Co, Cu, As, Se, Sn, and Ba element contents of the sample belonging to the G population were determined that be higher than that of the other population. When the antioxidant activity results of the species were evaluated; according to the CUPRAC (Cupric Reducing Antioxidant Capacity) method, the sample extracts of the B and G populations were determined that showed lower activity than the standard BHA, BHT, and Trolox values at 20 and 40 µg/mL concentrations, and showed close activity compared to the standards at 80 µg/mL concentrations. The species was determined that be antioxidant activity even at low concentrations. According to DPPH (2,2-diphenyl-1-picrylhydrazyl) method, the antioxidant activity of the extract of the B and G populations was determined as 22.95 and 23.76 mg TE/mL, respectively.
  • Küçük Resim
    Öğe
    Determination of zinc in dried nuts by slotted quartz tube-flame atomic absorption spectrometry (SQT-FAAS) with citric acid-coated magnetic nanoparticle (CAMNP) based solid phase extraction (SPE)
    (Taylor and Francis, 2024) Umaz, Kader; Umaz, Adil; Aydın, Işıl; Aydın, Fırat
    This study reports a sensitive method for trace zinc using slotted quartz tube-flame atomic absorption spectrometry (SQT-FAAS) with citric acid-coated magnetic nanoparticle-solid phase extraction (CAMNP-SPE). To increase the efficiency, we univariately optimized the pH, buffer volume, CAMNP mass, eluent concentration and volume, mixing type and time, temperature, and interaction time. The study identified the limits of detection and quantification values for CAMNP-SPE-SQT-FAAS under the specified optimum conditions to be 12.30 and 41.00 μg L−1, respectively. The newly developed method improved the detection power of traditional FAAS by 13.25 times. The findings of this study report a sensitive and accurate method to determine trace zinc in complex matrices.
  • Küçük Resim
    Öğe
    İki Farklı Lokasyona ait Altın Otunun (Helichrysum arenarium) Uçucu Bileşenlerinin Belirlenmesi ve Karşılaştırılması
    (Gümüşhane Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2020) Umaz, Adil; Umaz, Kader
    Bu çalışmada, 2019 yılı Haziran-Ağustos ayında iki farklı bölgede toplanan Altın Otunun (Helichrysum arenarium) Katı Faz Mikro Ekstraksiyon (SPME) yöntemi kullanılarak uçucu bileşenleri Gaz Kromatografisi-Kütle Spektroskopisi (GC-MS) ile belirlendi. Bitlis Nemrut Krater Gölü çevresindeki Altın Otu örneğinde toplam 21 adet uçucu bileşen tespit edilirken, Giresun’un Şebinkarahisar İlçesi’nin dağlık bölgelerindeki Altın Otu örneğinde toplam 33 adet uçucu bileşen tespit edildi. Bitlis Nemrut Krater Gölü çevresindeki Altın Otunda α-sedren (%26.65), α-pinen (%14.97), α-humulen (%10.65), aromadendren (%6.79), α-kurkumen (%6.31), germakren B (%4.43), α-kadinen (%3.82), ökaliptol (%3.57), α-duprezianen (%3.57) ve limonen (%2.69) uçucu ana bileşen olarak tespit edilirken, Giresun Şebinkarahisar İlçesinin dağlık alanlarındaki Altın Otuna ait örnekte α-pinen (%47.63), α-himakhalen (%17.01), α-humulen (%5.21), δ-kadinen (%4.98), γ-kadinen (%4.01) ve ökaliptol (%3.46) uçucu ana bileşen olarak tespit edildi.