Yazar "Erdogdu, Yasemin" seçeneğine göre listele
Listeleniyor 1 - 5 / 5
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Changes in secondary metabolites and essential oil contents in black cumin (Nigella saliva L.) in response to drought stress(Julius Kuhn Inst - Jki, 2024) Erdogdu, Yasemin; Gok, Sila Barut; Gocmen, ErhanWater stress is one of the foremost stress factors affecting the production of secondary metabolites in plants. The aim of the research was to evaluate the response of black cumin ( Nigella sativa L.) to water stress in terms of bioactive compounds and essential oil constituents in a semi-arid region (Thrace region, T & uuml;rkiye). Black cumin seeds were subjected to six irrigation regimes (I0, I25, I50, I75, I 100 , I125). The total phenolic contents of extracts decreased significantly by about 0.39-0.59-fold under irrigation regimes from I 75 to I 125 , compared to the drought stress conditions (I0). Irrigation regimes, except over-irrigation (I125) and low water deficit (I75) conditions, had no significant effect on the antioxidant activity. The highest flavonoid content recorded under the over-irrigation regime was 406.6 +/- 4.6 mg QE g-1. The effect of irrigation on essential oil content was statistically significant. The lowest thymoquinone content was obtained under the drought stress conditions (I0), while the highest thymoquinone content was obtained from the high-water deficit conditions (I25). Based on principal component analysis, carvacrol and 4-terpineol were the most determinant compounds involved in adaptation to drought stress, and the most determinant component for low water stress was thymoquinone, which had the highest rate in the study.Öğe Chemical composition and antimicrobial activity of essential oils from six lavender (Lavandula angustifolia Mill.) cultivars(Czech Academy Agricultural Sciences, 2024) Gok, Sila Barut; Erdogdu, YaseminThe present study aimed to determine the chemical composition and in vitro antimicrobial potential for the first time of essential oils (E0s) from six cultivars (Druzhba, Raya, Hebar, Hemus, Yubileina, Sevtapolis) of lavender (Lavandula angustifolia Mill.) cultivated in Turkiye (Tekirdag) against a panel of pathogenic and non-pathogenic microorganisms. The chemical composition of E0s, analysed using gas chromatography/mass spectrometry (GC/MS), revealed 34 different components in the six cultivars. The results indicate that the main major constituents of all E0s were monoterpenoid linalool (47.60-64.13%) and linalyl acetate (12.92-26.08%). Based on principal component analysis (PCA) cvs. Druzhba, Raya and Hebar were situated in the centre right quadrant of the plot and were characterised by linalool and linalyl acetate in subgroup one. The results of antimicrobial assays revealed that lavender E0s were active against all strains of bacteria tested. For bacteria, the strongest activity of cv. Hemus was observed against Enterococcus faecalis (IZ = 19 +/- 0.10 mm, MIC = MMC = 6.25 (mu g/mL), while the weakest potency was seen against the gram-negative Salmonella enterica (IZ = 21 +/- 1.00 mm, MIC = MMC = 31.25 (mu g/mL). Based on PCA, the first subgroup of cvs. Hebar and Raya was characterised by Lactobacillus rhamnosus, E. faecalis and Lactobacillus pentosus and was situated in the bottom right quadrant of the plot.Öğe Production of secondary metabolites by biotechnological methods(Current Biology Ltd, 2013) Kalınkara, Elif Ceren; Erdogdu, Yasemin; Gök, Sila Barut[No Abstract Available]Öğe The effect of irrigation treatments at different development stages on the bioactive components of sunflower cake(Czech Academy Agricultural Sciences, 2023) Gocmen, Erhan; Gok, Sila Barut; Erdogdu, YaseminThe aim of the study was to determine the effect of water deficiency at different development stages on the bioactive content and phenolic compounds in sunflower (Helianthus annuus L.) cake, the residue left after oil is extracted from sunflower seeds. A sunflower genotype was randomly planted in a complete block design with eight different combinations of irrigation (T1-T8) by increasing the available soil moisture measured at different plant growth stages (vegetative, flowering and grain formation). Results indicated that the total phenolics of extracts va-ried between 1.03-2.03 times more than under drought stress (T8). The antioxidant capacity response of seed cake was 14-39% lower than under drought stress. Irrigation treatment, except in the grain formation stage, was found to enhance the biosynthesis of phenolic compounds such as vanillic and caffeic acids. Irrigation only in the grain formation stage induced the accumulation of phenolic compounds such as coumaric acid and rutin hydrate. The present study established that residues resulting from oil extraction could be converted to a polyphenol-enrichment agent for food systems by manipulating the irrigation treatments.Öğe The use of plant secondary metabolites as food additives(Current Biology Ltd, 2013) Gök, Sila Barut; Kalınkara, Elif Ceren; Erdogdu, Yasemin[No Abstract Available]
