Eanes, Ritchie C.
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Eanes, R. C.
Eanes, R.C.
Eanes, R.C.
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04.01. Department of Chemistry
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Former Staff
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Sustainable Development Goals
1NO POVERTY
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2ZERO HUNGER
1
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3GOOD HEALTH AND WELL-BEING
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4QUALITY EDUCATION
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5GENDER EQUALITY
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6CLEAN WATER AND SANITATION
1
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7AFFORDABLE AND CLEAN ENERGY
1
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8DECENT WORK AND ECONOMIC GROWTH
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
1
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10REDUCED INEQUALITIES
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11SUSTAINABLE CITIES AND COMMUNITIES
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
1
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13CLIMATE ACTION
1
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14LIFE BELOW WATER
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15LIFE ON LAND
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16PEACE, JUSTICE AND STRONG INSTITUTIONS
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17PARTNERSHIPS FOR THE GOALS
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Documents
3
Citations
34
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2
This researcher does not have a WoS ID.
Scholarly Output
6
Articles
3
Views / Downloads
4656/2830
Supervised MSc Theses
2
Supervised PhD Theses
0
WoS Citation Count
31
Scopus Citation Count
34
Patents
0
Projects
1
WoS Citations per Publication
5.17
Scopus Citations per Publication
5.67
Open Access Source
6
Supervised Theses
2
| Journal | Count |
|---|---|
| Journal of Liquid Chromatography and Related Technologies | 2 |
| New Journal of Chemistry | 1 |
Current Page: 1 / 1
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6 results
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Now showing 1 - 6 of 6
Article Citation - WoS: 23Citation - Scopus: 26Development of Practical Hplc Methods for the Separation and Determination of Eggplant Steroidal Glycoalkaloids and Their Aglycones(Taylor and Francis Ltd., 2008) Eanes, Ritchie C.; Tek, Neslihan; Kırsoy, Öyküm; Frary, Anne; Doğanlar, Sami; Almeida, Adelia E.A practical set of HPLC methods was developed for the separation and determination of the eggplant steroidal glycoalkaloids, solanine, chaconine, solasonine, solamargine, and their aglycones, solasodine and solanidine. A gradient method was initially developed, but proved to be neither robust nor practical. Three separate isocratic methods using acetonitrile and ammonium dihydrogen phosphate were developed and shown to be more repeatable, less subject to fluctuations in mobile phase composition, and less time consuming. The effect of adjusting buffer pH, column temperature, and buffer type (triethylammonium phosphate vs. ammonium dihydrogen phosphate) were evaluated. It was also discovered that, by addition of 10% methanol to the acetonitrile portion of the mobile phase, more control over the separations was possible. The use of methanol as a mobile phase entrainer greatly improved separations in some cases and its effectiveness was also dependent upon column temperature. Assessments of the method recovery, limit of detection, and limit of quantitation were made using extracts from S. melongena and S. linnaeanum.Master Thesis Chromatographic Determination of Glycoalkaloids in Eggplant(Izmir Institute of Technology, 2006) Tek, Neslihan; Tek, Neslihan; Eanes, Ritchie C.Novel modifications were applied to high-performance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC-MS) for the separation and quantitation of the steroidal glycoalkaloids (SGAs) solanine, chaconine, solamargine, and solasonine as well as the steroidal glycoalkaloid aglycones (SGAAs) solasodine and solanidine. Because attempts to develop a gradient elution HPLC method were only marginally successfully and non-robust, it was deemed more practical to develop separate HPLC methods for either the SGAs or SGAAs of interest. Furthermore, a novel approach using methanol as a mobile phase modifier was still required to successfully separate solamargine and chaconine. Comparing potential mobile phase buffers, ammonium dihydrogen phosphate was chosen as the most efficient, stable, and economical. Separations were best realized isocratically at a column temperature of 50 °C for the SGAs and either 26 °C or 50 °C for the SGAAs. Progesterone was applied as an internal standard. Effects of pH were also tested. Figures of merit such as limit of detection (LOD), limit of quantitation (LOQ), and linear dynamic range are described herein. Lastly, solid-phase microextraction (SPME) using on-fiber derivatization coupled with GC-MS was investigated for extraction and analysis of these SGAAs. A carbowax divinylbenzene (CW-DVB) coated SPME fiber was the most suitable. Solanidine could be extracted and identified directly using our SPME/GC-MS method while solasodine required a derivatization step involving trimethylsilylimidazole (TMSI). Although initial attempts were qualitatively reproducible, eventual degradation to fibers precluded complete study. Cholesterol as an internal standard was investigated.Master Thesis Development of Inductively Coupled Plasma Spectroscopic Methods for the Determination of Metals in Beluga (delphinapterus Leucas) and Pygmy Sperm (kogia Breviceps) Whale Liver Samples(Izmir Institute of Technology, 2005) Parlayan, Filiz; Eanes, Ritchie C.Inductively couple plasma optical emission spectrometry (ICP-OES) is widely used to monitor elements in biological samples from marine organisms for ecological evaluations. Matrix effects (particularly those related to acid and salt type and concentrations) can present a barrier to the applicability of this instrumental method. To have a better understanding of these effects and to choose a suitable internal standard to correct for the signal variations, a procedure based on Principal Component Analysis (PCA) of the data from an axial-mode ICP-OES instrument with sequential detection was performed. Different from other published studies, it was found that ionic lines were more affected by matrix changes. Elements with high ionization energies and energy sums such as Cd and Zn showed a significant change for signal intensities and calculated concentrations due to the presence of acid, salt, and multielement matrix effects. It was observed that acid has a higher influence on the analyte signal as compared to the "salt-only" case. Furthermore, when several interfering elements were present in the sample, the matrix effect was either enhanced or reduced when compared with a solution containing only a single interfering element. Applicability of the proposed technique for the analysis of whale liver homogenate NIST certified material was investigated. The values of the corrected concentrations were in good agreement with the certified values, confirming the capabilities of the selected internal standards for compensation of matrix effects.Project Deliverable Patlıcanda glycoalkaloid analizi için metot geliştirilmesi(TÜBİTAK - Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, 2007) Eanes, Ritchie C.; Parlayan, Filiz; Tek, Neslihan; Akgül, Yurdanur[No Abstract Available]Article Citation - WoS: 2Citation - Scopus: 2Solid-Phase Microextraction (spme) Followed by On-Fiber Derivatization of Solasodine and Solanidine Aglycones of Steroidal Glycoalkaloids(Taylor and Francis Ltd., 2008) Eanes, Ritchie C.; Tek, NeslihanSolid-phase microextraction (SPME), followed by on-fiber derivatization was investigated for the analysis of the steroidal glycoalkaloid aglycones, solasodine and solanidine. The aglycones were first extracted by direct immersion of the SPME fiber in the sample medium and then derivatized on the fiber in a separate step using 1-(trimethylsilyl)imidazole (TMSI). The derivatized compounds were then desorbed from the SPME fiber and detected by GC-MS. Polydimethylsiloxane/Divinylbenzene (PDMS-DVB), Carboxen/ Polydimethylsiloxane (CAR-PDMS), and Carbowax/Divinylbenzene (CW-DVB) fibers were employed with the CW-DVB fibers being the most successful, as expected. Closed-end capillary tubes were used to hold the extraction media. Both aglycones were successfully extracted, derivatized, and detected by GC-MS. Solasodine always required derivatization, but solanidine did not. The same method was successfully applied to cholesterol so that it could be used as an internal standard. Also, using the closed-end capillary tubes, a two-phase extraction system was also investigated, whereby the fiber was only exposed to the phase in which it was presumed to be less damaged. However, in all cases, fiber degradation was significant, preventing the use of extended extraction times and limiting reuse of the fibers. However, the results represent a first look into the feasibility of the method. With the development of more suitable SPME phases, this method could potentially provide a complementary route for routine determinations of glycoalkaloids for both research and food quality control.Article Citation - WoS: 6Citation - Scopus: 6The Utilization of Ph Sensitive Spirocyclic Rhodamine Dyes for Monitoring D-Fructose Consumption During a Fermentation Process(Royal Society of Chemistry, 2013) Karakuş, Erman; Üçüncü, Muhammed; Eanes, Ritchie C.; Emrullahoğlu, MustafaThe colorimetric and fluorometric detection of d-fructose was achieved by employing a two component sensing system composed of an arylboronic acid as the host molecule and a pH sensitive spirocyclic rhodamine dye as the indicator molecule.