Browsing by Author "Yemis, F"
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Item Determination of the phytoalexin resveratrol (3,5,4′-trihydroxystilbene) in peanuts and pistachios by high-performance liquid chromatographic diode array (HPLC-DAD) and gas chromatography-mass Spectrometry (GC-MS)Tokusoglu, Ö; Ünal, MK; Yemis, FThe phytoalexin resveratrol (3,5,4'-trihydroxystilbene) in edible peanut (Arachis hypogaea L.) and pistachio (Pistacia vera L.) varieties grown in Turkey was analyzed by high-performance liquid chromatographic diode array and gas chromatography-mass spectrometric detection. trans-resveratrol in six peanut varieties, five pistachio varieties, and four market samples ranged between 0.03 and 1.92 mu g/g. The qerezlik 5025 peanut (1.92 +/- 0.01 mu g/g) and Ohadi pistachio genotype (1.67 +/- 0.01 mu g/g) had significantly higher trans-resveratrol contents. Peanuts contained 0.03-1.92 mu g/g (av = 0.84 mu g/g) of trans-resveratrol, whereas pistachio contained 0.09-1.67 mu g/g (av = 1.15 mu g/g). With exposure to UV light for 1 min, trans-resveratrol concentrations of samples ranged from 0.02 to 1.47 mu g/g and those of cis-resveratrol from 0.008 to 0.32 mu g/g. The occurrence of resveratrol in peanut and pistachio was confirmed by total ion chromatograms (TIC) of bis[trimethylsilyl]trifluoroacetamide derivatives of resveratrol isomers and comparison of the mass spectral fragmentation data with those of a resveratrol standard. Formation of the cis-isomer in pistachios was higher than in peanuts.Item Molecularly Imprinted Polymers and Their Synthesis by Different MethodsYemis, F; Alkan, P; Yenigül, B; Yenigül, MOver the past thirty years, molecular imprinting has aroused great research interest for scientists. This attention can be explained by the serious potential advantages of using molecularly imprinted polymers in place of natural receptors and enzymes such as their superior durability, low-cost and easy preparation. Furthermore molecular imprinting is a promising technique for the preparation of polymer composites with predetermined selectivity and high affinity. This mini review examines and evaluates the preparation technique and utility application of molecularly imprinted polymers (MIPs) in several areas. The review begins with a brief introduction to MIPs with a focus on their preparations and continues with application areas.Item Phenolic Compounds, Fatty Acid Contents, and Antibacterial Properties of Ozonated and Non-Ozonated Tobacco Seed OilsYemis, F; Alp, H; Ay, E; Tepe, M; Ay, KIn this study, the fatty acid content, phenolic compounds, and antimicrobial activity of seed oils from Ege & Ouml;zba & scedil; (EO), Sar & imath;ba & gbreve;lar 407 (S407) and Akhisar 98 (A98) tobacco plants grown in the Aegean region were investigated. The ozonation process altered fatty acid and phenolic compound compositions and affected antimicrobial activities against Gram-positive and Gram-negative bacteria in the oils. Tobacco seed oils (TSOs) were extracted via cold pressing (CP) and Soxhlet extraction (SE). Fatty acids and phenolic compounds were analyzed using GC-FID and LC-MS/MS, respectively. Non-ozonated oils averaged 73% linoleic acid, 13% oleic acid, 9% palmitic acid, and 3% stearic acid, while ozonated oils contained 41% linoleic acid, 18% oleic acid, 22% palmitic acid, and 11% stearic acid. The presence of 33 phenolic compounds was investigated and 22 common phenolic compounds were detected in both ozonated and non-ozonated TSOs, including gallic acid, protocatechuic acid, chlorogenic acid, 3-hydroxybenzoic acid, (-)-epicatechin, 2,5-dihydroxybenzoic acid, caffeic acid, verbascoside, luteolin-7-glucoside, hesperidin, and rosmarinic acid. The increased antimicrobial activity of fatty acids and phenolic compounds following ozonation suggests the potential for developing creams to treat skin diseases and wounds caused by antibiotic-resistant pathogens, and to reduce the effects of aging skin wrinkles.Item An Overview of Analytical Methods for Bisphenol AHarmanci, NY; Yemis, FOur food preparation and eating habits have gradually changed due to the pace of business life. Which have paved the way for the rapid development of ready-made food and plastic production industries. Various packets used for storing and selling ready-made foods and disposable plastic products contain Bisphenol A (BPA) which is very dangerous for health. This substance which can be transferred to the food not only acts like a hormone in the human body but also causes various diseases such as cancer, diabetes and obesity. The sensitive determination of this substance has gained importance in foods, human body fluids and tissues. For this purpose, researchers have developed various chromatographic, electrochemical and spectroscopic methods for BPA determination. In this review, the purpose of use, usage areas, exposure routes of BPA and its harms, methods developed to determine substance in question and pros and cons of various methods are discussed.Item Classification, Uses and Environmental Implications of DisinfectantsYemis, F; Harmanci, NYDisinfectants are not only cleaning reagents such as soap or detergents but are hygienic materials prepared with the composition of various chemicals. Many classification routes are possible, but they are placed in two main groups, such as organic and inorganic disinfectants. The classification prevails for high level disinfectants and depends on chemical structure. In high-level disinfectants aldehydes, hydrogen peroxide, and chloride type chemicals are used. In contrast, alcohols, phenols, ammonium salts, and iodine solutions are recommended for low disinfectant applications. Soap, iodide, and alcohol solutions are the best antiseptic agents for hand and skin. Iodine-based solutions are good primary tissue and skin disinfectants. The alcohol solutions have a good inhibitory effect on many microorganisms, micro bacteria, fungi, and various viruses. These solution types are not hazardous to use as both antiseptic and surface disinfectants compared to many other chemicals.Item IN DIFFERENT MATURATION STAGES OF ARUM ITALICUM MILER (ARACEAE) FRUITS, DETERMINATION OF THE ELLAGIC ACID, HESPERIDIN, RESVARATROL AND QUERCETIN QUANTITIES BY HPLC-DADYenil, N; Yemis, F; Guler, AArum Italicum Mill. fruits that have antioxidant effect and some phenolic compounds were investigated at its different maturation stages. Observing of some phenolic compounds like ellagic acid, hesperidin, resveratrol and quercetin varied from depending on their ripening stages in harvest as immature, half mature and mature crops. These compounds can be recovered from Arum Italicum Mill. fruits by using the Soxhlet extraction method in methanol for four hours. And, the phenolic compounds in these fruits can easily be identified by using HPLC-DAD device. It is obvious that the amounts of ellagic acid, hesperidin, resveratrol and quercetin in half-mature fruits of Arum Italicum Mill. decrease and even hesperidin, resveratrol and quercetin disappear altogether. While the antioxidant effect was determined by using DPPH and TEAC, the total phenolic compounds of the fruits in all harvest periods were defined by using standards such as gallic acid and catechin.Item Nitrite in Nature: Determination with Polymeric MaterialsYenil, N; Yemis, FNitrogen compounds being important for the vital activities of living things are produced by the nitrification process and occurred spontaneously in the nitrogen cycle. Human vital activities are also responsible for the extra nitrogen released into the atmosphere. So, both human and environmental healths are negatively affected by the increasing nitrate and nitrate amounts in water and soil. For this reason, it is aimed to ensure regular control of nitrates and nitrites at certain levels in order to protect the universe and all living things. Their precise and selective determination by various methods is very important. Their determinations can usually be made by using electrochemical, spectrophotometric, chromatographic and titrimetric methods. Nowadays instead of these techniques, sensors are preferred in determining nitrate and nitrite due to their easy, fast, selective and sensitive application properties. Furthermore, polymeric materials have shown great promise for different sensing applications such as gas, humidity, explosive and water pollutants. Sensors, which are developed by polymerization, have very high quality for the determination of nitrite. The highly sensitive results of optical and electrochemical sensors attract the attention of researchers. In this review, different detection methods for nitrite ions and various studies on the preparation of polymeric sensors that can selectively capture the nitrite ions in complex matrices are examined.Item The Panacea Plants for Environment and Humanity: Caper and RithaYemis, F; Yenil, NCaper and Ritha are plants which have very important effects on both living beings and natural habitat. They are used in many areas like medicine, pharmacy, cosmetics and agriculture because of their positive features. Caper is compatible with the Mediterranean ecosystem and resistant to drought and high-salinity. When compared to the other most plants, it can remain green for a long time without water even in the summer season. Due to this magnificent property, this plant is effectively used for environmental protection. It has been reported that Caper contains biologically active compounds such as glucosinolates, alkoloids, phenolics, flavonoid, tocopherol and minerals such as sodium, potassium, phosphorus, calcium, magnesium, zinc and iron. Ritha grows in Asia's tropical and sub-tropical regions. It contributes to the environment like Caper because, it has ability to capture the chemical pollution from the soil. So, it helps to improve the quality and efficiency of the land by holding heavy metals like mercury, iron and zinc in the leaves and grabbing lead and cadmium in its fruits. Moreover, it biologically decomposes injurious organic molecules such as hexachlorobenzene and naphthalene. Furthermore, the nectar of Ritha can kill the flies and larvae of Southern cattle mite's species called Boophilus microplus.