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Yejun Zhang,Xin Li,Dequan Zhang,Chi Ren,Yuqiang Bai,Muawuz Ijaz,Xu Wang,Yingxin Zhao 한국축산식품학회 2021 한국축산식품학회지 Vol.41 No.4
The objective of this study was to examine the relationship between meat quality attributes and the changes of sarcoplasmic protein acetylation and myofibrillar protein acetylation in lamb longissimus thoracis et lumborum muscles at different postmortem phases. Protein acetylation, color, pH, shear force, myofibril fragmentation index and cooking loss were measured. The total level of acetylated sarcoplasmic proteins showed a negative relation with pH, a positive relation with a*, b* and cooking loss at the pre-rigor phase. Sarcoplasmic proteins acetylation affected postmortem pH by regulating glycolysis, which in turn affects color and cooking loss. The total level of acetylated myofibrillar proteins showed a positive relation with shear force at the pre-rigor phase. Myofibrillar proteins acetylation affected meat tenderness by regulating muscle contraction. This study indicated that acetylation played a regulatory role of meat color, water-holding capacity, and tenderization process at early postmortem.
Xie, Fazhi,Zhang, Fengjun,Xuan, Han,Ge, Yejun,Wang, Yin,Li, Guolian,Zhu, Lei,Oh, Won-Chun The Korean Ceramic Society 2014 한국세라믹학회지 Vol.51 No.5
In this work, a new method that utilizes L-cysteine salicylaldehyde Schiff-base modified macroporous polystyrene resin (PS-CSC) as an effective sorbent has been developed for preconcentration of trace cadmium and lead in environmental water samples. The effect of pH, the contact time, the elution conditions, the flow rate, the initial concentration of target metal ions, and the effects of interfering ions on the preconcentration of the analytes were investigated. The maximum adsorption capacity of PS-CSC under optimum conditions for cadmium and lead were found to be 6.03 - 18.17 mg/g and 12.58 - 36.13 mg/g when the initial concentration of metal ions between 5.0 - 90 mg/L. The limits of detection for cadmium and lead were 2.46 ng/L and $0.52{\mu}g/L$, with a preconcentration factor of 200. The developed method has been validated by analyzing certified reference material and successfully applied for the enrichment and determination of trace cadmium and lead from environmental water samples.
Fazhi Xie,Feng-Jun Zhang,Han Xuan,Yejun Ge,Yin Wang,Guolian Li,Lei Zhu,오원춘 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.5
In this work, a new method that utilizes L-cysteine salicylaldehyde Schiff-base modified macroporous polystyrene resin (PSCSC)as an effective sorbent has been developed for preconcentration of trace cadmium and lead in environmental water samples. The effect of pH, the contact time, the elution conditions, the flow rate, the initial concentration of target metal ions, andthe effects of interfering ions on the preconcentration of the analytes were investigated. The maximum adsorption capacity of PSCSCunder optimum conditions for cadmium and lead were found to be 6.03 - 18.17 mg/g and 12.58 - 36.13 mg/g when the initialconcentration of metal ions between 5.0 - 90 mg/L. The limits of detection for cadmium and lead were 2.46 ng/L and 0.52 μg/L,with a preconcentration factor of 200. The developed method has been validated by analyzing certified reference material andsuccessfully applied for the enrichment and determination of trace cadmium and lead from environmental water samples.
Chundi Seshendra Reddy,Liwen Zhang,Yejun Qiu,Yanan Chen,A. Sivasankar Reddy,P. Sreedhara Reddy,Sreekantha Reddy Dugasani 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.63 No.-
Graphene-based device/sensor made of multifunctional nanomaterials is an emerging technology due to its huge impact on the engineering materials. Herein, we report the synthesis of pristine SnO2, Al-doped SnO2 (Al–SnO2), and graphene-embedded Al–SnO2 (G–Al–SnO2) nanotubes by one-step electrospinning method and studied their physical and gas sensing characteristics. The synthesized tubular structure was confirmed by scanning electron microscope (SEM) and transmission electron microscope (TEM). Structural, chemical binding, pore size, and chemical composition/elemental states were estimated by the X-ray diffraction, Raman, BET, and X-ray photoelectron spectroscopy, respectively. The performance of the gas sensing based on SnO2, Al–SnO2, and G–Al–SnO2 materials for H2 detection was investigated, and the G–Al–SnO2 composite nanotubes exhibit the superior sensitivity at 300 °C. The sensing response reaches about 23.8 at H2 concentration of 100 ppm with a shorter response time of about 2.2 s and recovery time of about 1.4 s. The gas sensing performance of the G–Al–SnO2 nanotubes is much better than that of the pristine SnO2 and Al–SnO2 nanotubes, which is probably attributed to the relatively smaller diameter of about 100 nm, better thermal and electronic conductivity, and relatively high oxygen vacancy, induced by graphene and Al-doping. The prepared H2 sensor is a simple, compact and highly sensitive, which holds high promising in many fields.