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Tuesday, December 9, 2014
Nanoteknoloji ve Nanosensörler Semineri
Kimya derslerinde öğrencilerimizin bilinçlenmesi amacı ile okulumuzda 9 Aralık 2014 günü bir seminer düzenlendik. Seminer katılımcımız Hacettepe Üniversitesi Fen Fakültesi Kimya Bölümü Biyokimya Anabilim Dalı Başkanı Prof.Dr. Adil DENİZLİ “Nanoteknoloji ve Nanosensörler“konulu sunumunu gerçekleştirdi.
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Tuesday, December 9, 2014
New Paper in RSC Analyst
Novel tentacle-type polymer stationary phase grafted with anion exchange polymer chains for open tubular CEC of nucleosides and proteins
Cemil Aydoğan, Kemal Çetin and Adil Denizli
A novel and simple method for preparation of a tentacle-type polymer stationary phase grafted with polyethyleneimine (PEI) anion exchanger was developed for open tubular capillary electrochromatography (OT-CEC) of nucleosides and proteins. The polymeric stationary phase was prepared using 3-chloro-2-hydroxypropyl methacrylate (HPMA-Cl)-based reactive monomer. The preparation procedure included pretreatment of the capillary inner wall, silanization, in situ graft polymerization with HPMA-Cl and PEI modification. To compare with the tentacle-type capillary column with PEI functionalization, a monolayer capillary column without PEI functionalization was also prepared. The electrochromatographic characterization of the prepared open tubular column was performed using alkylbenzenes. [...]
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New Paper in RSC Analyst
Novel tentacle-type polymer stationary phase grafted with anion exchange polymer chains for open tubular CEC of nucleosides and proteins
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Tuesday, December 9, 2014
New Paper in ACS Analytical Chemistry
Lysine-Promoted Colorimetric Response of Gold Nanoparticles: A Simple Assay for Ultrasensitive Mercury(II) Detection
Gulsu Sener, Lokman Uzun, Adil Denizli
Although numerous methods have been reported for the analysis of toxic mercury (Hg2+) ions in drinking water, development of simple, rapid, inexpensive, and sensitive sensors still remains a great challenge. Here, we report a simple yet very sensitive colorimetric assay for rapid detection of Hg2+ in water. The colorimetric assay is based on the aggregation of as-prepared citrate-capped gold nanoparticles (AuNPs) in the presence of Hg2+ ions and the positively charged amino acid, lysine. The detection limit of this inexpensive colorimetric assay is 2.9 nM, which is below the limit value (10 nM) defined by the U.S. Environmental Protection Agency in drinkable water. Also, the colorimetric response of citrate-capped AuNPs in the presence of lysine is very selective to the Hg2+. In addition, the colorimetric assay is very fast, and all analyses can be completed within a few minutes.
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New Paper in ACS Analytical Chemistry
Lysine-Promoted Colorimetric Response of Gold Nanoparticles: A Simple Assay for Ultrasensitive Mercury(II) Detection
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Tuesday, December 9, 2014
New Paper in ACS Applied Materials & Interfaces
Colorimetric Sensor Array Based on Gold Nanoparticles and Amino Acids for Identification of Toxic Metal Ions in Water
Gulsu Sener, Lokman Uzun, Adil Denizli
A facile colorimetric sensor array for detection of multiple toxic heavy metal ions (Hg(2+), Cd(2+), Fe(3+), Pb(2+), Al(3+), Cu(2+), and Cr(3+)) in water is demonstrated using 11-mercaptoundecanoic acid (MUA)-capped gold nanoparticles (AuNPs) and five amino acids (lysine, cysteine, histidine, tyrosine, and arginine). The presence of amino acids (which have functional groups that can form complexes with metal ions and MUA) regulates the aggregation of MUA-capped particles; it can either enhance or diminish the particle aggregation. The combinatorial colorimetric response of all channels of the sensor array (i.e., color change in each of AuNP and amino acid couples) enables naked-eye discrimination of all of the metal ions tested in this study with excellent selectivity.
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Tuesday, December 9, 2014
New Paper in ACS Applied Materials & Interfaces
Colorimetric Sensor Array Based on Gold Nanoparticles and Amino Acids for Identification of Toxic Metal Ions in Water
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Friday, November 28, 2014
15. Kromatografi Kongresi - Uşak
Uşak Üniversitesi Mühendislik Fakültesi’nin ev sahipliğinde, Uşak Üniversitesi Mühendislik Fakültesi Gıda Mühendisliği ve Hacettepe Üniversitesi Fen Fakültesi Kimya Bölümü tarafından ortaklaşa düzenlenmekte olan 15. Ulusal Kromatografi Kongresi 8-10 Nisan 2015 tarihleri arasında Uşak Üniversitesi’nde gerçekleşecektir.
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Thursday, October 30, 2014
Hangi Bilim İnsanlarımızın Başarıları Hızla Artıyor?
Yurtiçi ve yurtdışında 164 bilimcimizin son 9 yılda başarıları büyük ölçüde arttı. Bir başarı ölçütü olan h-sayısı ölçeğine göre, h-sayısı 40'ın üzerinde (çok başarılı) olan bilimcimizin sayısı sıfır iken, bugün 17 oldu. H-sayısı 20 ve üzerinde olan (başarılı) bilimcilerimizin sayısı, geçen 7 yıllık sürede 41'den 164'e yükseldi. Bu büyük başarı...
H-sayısı 80'in üzerinde ve 80'e yakın olan ve Nobel ödüllü olacak ölçüde evrensel başarıyı tamamlayan ölçüye ulaşmış bilimcilerimizin hepsi yurtdışında. Aziz Sancar, h-97 sayısı ile tepede. Hadis Markoç h-78, Niyazi Serdar Sarıçiftçi ve Gökhan Hotamışlıgil h-76. Bu 4 bilim insanının bilimsel makalelerine yapılan atıf sayısı 30 bini aşmış durumda. Makale sayıları çok yüksek... Türkiye'de yaşayan 4 bilimcimizin atı sayısının da 10 bini aştığı görülüyor.
Prof. Dr. H. Mehmet Doğan
Prof. Dr. Mustafa Soylak
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