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MICROCHEMICAL JOURNAL · 2019 · IF 3.206

Copper nanoclusters-modified with papaya juice for fluorescence turn-on detection of serum l-histidine Today four files of proofs was sent to m.saksena@elsevier.com Please check the files

Qiqi Tan,Juan Qiao,Rongyue Zhang,Li Qi

Papaya juice protected copper nanoclusters was depicted for detection of serum l -histidine. The fluorescent probe was synthesized by using a simple “one pot” hydrothermal preparation strategy with papaya juice playing dual roles both as a green reductant and stabilizer. The excitation and emission peaks of the copper nanoclusters were at 400 nm and 490 nm, respectively. The fluorescence was turned-on in addition of l -histidine due to the enhanced surface electron density. The fluorescent intensity increased linearly with l -histidine concentration ranging from 2.0 to 50.0 µM. The proposed copper nanoclusters was further applied to determine l -histidine in rat serum after intraperitoneal injection.

CAS / MDL: 7758-98-7 7664-38-2 7558-80-7

研究领域: 生物化学 · 分析化学

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JOURNAL OF CHROMATOGRAPHY A · 2014 · IF 4.258

A new graphene oxide/polypyrrole foam material with pipette-tip solid-phase extraction for determination of three auxins in papaya juice

Lihui Wang,Mingyu Wang,Hongyuan Yan,Yanan Yuan,Jing Tian

A new material, graphene oxide/polypyrrole (GO/Ppy), was synthesized by mixing graphene oxide and polypyrrole in a specific proportion. It possesses a unique structure similar to that of foam. A homemade pipette-tip solid-phase extraction (PT-SPE) device, which is more simple and convenient than traditional devices, was used for saving reagents and operation time. When GO/Ppy was used as the adsorbent of PT-SPE for determining three auxins (indole-3-propionic acid, indole-3-butyric acid, and 1-naphthaleneacetic acid) present in trace amounts in papaya juice, it showed high affinity and adsorption capacity for all the three auxins. GO/Ppy-PT-SPE also had a significant capacity for eliminating the interferences from the papaya juice matrix. Under optimized conditions, a good linearity of auxins was obtained in the range 16.3–812.5 ng g −1 ; the average recoveries at the three spiked levels of the three auxins ranged from 89.4% to 105.6% with the relative standard deviations ≤3.0%. Meanwhile, six papaya juice samples with different growth stages were analyzed under optimum conditions, and trace auxins in the range 18.3–100.6 ng g −1 were observed. Because of its high selectivity, simplicity, and reliability, the GO/Ppy-PT-SPE method developed herein can be potentially applied for determining trace auxins in complex biological samples.

CAS / MDL: 109-97-7 133-32-4 830-96-6 86-87-3

研究领域: 分析化学 · 植物生理学

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Copper nanoclusters-modified with papaya juice for fluorescence turn-on detection of serum l-histidine Today four files of proofs was sent to m.saksena@elsevier.com Please check the files

A new graphene oxide/polypyrrole foam material with pipette-tip solid-phase extraction for determination of three auxins in papaya juice