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Article: Chiral phosphoric acid-catalyzed transfer hydrogenation of 3,3-difluoro-3

Wang, Yumei / Wang, Guangzhu / Zhu, Yanping / Dong, Kaiwu

2024 Volume 20, Page(s) 205–211

Abstract: A convenient and efficient method for the synthesis of optically active difluoro-substituted indoline derivatives starting from the corresponding ... ...

Abstract	A convenient and efficient method for the synthesis of optically active difluoro-substituted indoline derivatives starting from the corresponding 3
Language	English
Publishing date	2024-02-01
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2192461-2
ISSN	1860-5397
ISSN	1860-5397
DOI	10.3762/bjoc.20.20
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Article ; Online: Spiral Deployment of Optical Fiber Sensors for Distributed Strain Measurement in Seven-Wire Twisted Steel Cables, Post-Tensioned against Precast Concrete Bars.

Zhu, Yanping / Chen, Genda

Sensors (Basel, Switzerland)

2022 Volume 22, Issue 19

Abstract: On-time monitoring and condition assessments of steel cables provide mission-critical data for informed decision making, ensuring the structural safety of post-tensioned concrete structures. This study aimed to develop a spiral deployment scheme of ... ...

Abstract	On-time monitoring and condition assessments of steel cables provide mission-critical data for informed decision making, ensuring the structural safety of post-tensioned concrete structures. This study aimed to develop a spiral deployment scheme of distributed fiber optic sensors (DFOS) and to monitor/assess the post-tensioned force in seven-wire twisted steel cables, based on the pulse-pre-pump Brillouin optical time domain analysis. Each DFOS was placed in a spiral shape between two surface wires of a steel cable and glued to the steel cable by epoxy. Image observations were conducted to investigate the entireness and bonding condition between the optical fiber and the steel wires. Eight concrete bar specimens were cast, each with a pre-embedded plastic or metal duct at its center and each was post-tensioned by a steel strand through the duct once they were instrumented with two strain and two temperature sensors. The strand was loaded/unloaded and monitored by measuring the Brillouin frequency shifts and correlating them with the applied strains and the resulting cable force after temperature compensation. The maximum, minimum, and average cable forces integrated from the measured stain data were compared and validated with those from a load cell. The maximum (or average) cable force was linearly related to the ground truth data with a less than 10% error between them, after any initial slack had been removed from the test setup. The post-tensioned force loss was bounded by approximately 30%, using the test setup designed in this study.
MeSH term(s)	Bone Wires ; Optical Fibers ; Plastics ; Steel
Chemical Substances	Plastics ; Steel (12597-69-2)
Language	English
Publishing date	2022-10-09
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2052857-7
ISSN	1424-8220 ; 1424-8220
ISSN (online)	1424-8220
ISSN	1424-8220
DOI	10.3390/s22197636
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Article ; Online: Trihalomethane prediction model for water supply system based on machine learning and Log-linear regression.

Li, Hui / Chu, Yangyang / Zhu, Yanping / Han, Xiaomeng / Shu, Shihu

Environmental geochemistry and health

2024 Volume 46, Issue 2, Page(s) 31

Abstract: Laboratory determination of trihalomethanes (THMs) is a very time-consuming task. Therefore, establishing a THMs model using easily obtainable water quality parameters would be very helpful. This study explored the modeling methods of the random forest ... ...

Abstract	Laboratory determination of trihalomethanes (THMs) is a very time-consuming task. Therefore, establishing a THMs model using easily obtainable water quality parameters would be very helpful. This study explored the modeling methods of the random forest regression (RFR) model, support vector regression (SVR) model, and Log-linear regression model to predict the concentration of total-trihalomethanes (T-THMs), bromodichloromethane (BDCM), and dibromochloromethane (DBCM), using nine water quality parameters as input variables. The models were developed and tested using a dataset of 175 samples collected from a water treatment plant. The results showed that the RFR model, with the optimal parameter combination, outperformed the Log-linear regression model in predicting the concentration of T-THMs (N
MeSH term(s)	Linear Models ; Water Supply ; Water Quality ; Machine Learning ; Trihalomethanes
Chemical Substances	bromodichloromethane (7LN464CH2O) ; chlorodibromomethane (3T4AJR1H24) ; Trihalomethanes
Language	English
Publishing date	2024-01-16
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	52039-1
ISSN	1573-2983 ; 0142-7245 ; 0269-4042
ISSN (online)	1573-2983
ISSN	0142-7245 ; 0269-4042
DOI	10.1007/s10653-023-01778-3
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Article ; Online: Rapid classification of coffee origin by combining mass spectrometry analysis of coffee aroma with deep learning.

Yang, Huang / Ai, Jiawen / Zhu, Yanping / Shi, Qinhao / Yu, Quan

Food chemistry

2024 Volume 446, Page(s) 138811

Abstract: Mislabeling the geographical origin of coffee is a prevalent form of fraud. In this study, a rapid, nondestructive, and high-throughput method combining mass spectrometry (MS) analysis and intelligence algorithms to classify coffee origin was developed. ... ...

Abstract	Mislabeling the geographical origin of coffee is a prevalent form of fraud. In this study, a rapid, nondestructive, and high-throughput method combining mass spectrometry (MS) analysis and intelligence algorithms to classify coffee origin was developed. Specifically, volatile compounds in coffee aroma were detected using self-aspiration corona discharge ionization mass spectrometry (SACDI-MS), and the acquired MS data were processed using a customized deep learning algorithm to perform origin authentication automatically. To facilitate high-throughput analysis, an air curtain sampling device was designed and coupled with SACDI-MS to prevent volatile mixing and signal overlap. An accuracy of 99.78% was achieved in the classification of coffee samples from six origins at a throughput of 1 s per sample. The proposed approach may be effective in preventing coffee fraud owing to its straightforward operation, rapidity, and high accuracy and thus benefit consumers.
MeSH term(s)	Coffee/chemistry ; Odorants/analysis ; Deep Learning ; Mass Spectrometry/methods ; Algorithms ; Volatile Organic Compounds/analysis
Chemical Substances	Coffee ; Volatile Organic Compounds
Language	English
Publishing date	2024-02-22
Publishing country	England
Document type	Journal Article
ZDB-ID	243123-3
ISSN	1873-7072 ; 0308-8146
ISSN (online)	1873-7072
ISSN	0308-8146
DOI	10.1016/j.foodchem.2024.138811
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Article ; Online: Targeting PI3K/Akt in Cerebral Ischemia Reperfusion Injury Alleviation: From Signaling Networks to Targeted Therapy.

Zheng, Ting / Jiang, Taotao / Ma, Hongxiang / Zhu, Yanping / Wang, Manxia

Molecular neurobiology

2024

Abstract: Ischemia/reperfusion (I/R) injury is a pathological event that results in reperfusion due to low blood flow to an organ. Cerebral ischemia is a common cerebrovascular disease with high mortality, and reperfusion is the current standard intervention. ... ...

Abstract	Ischemia/reperfusion (I/R) injury is a pathological event that results in reperfusion due to low blood flow to an organ. Cerebral ischemia is a common cerebrovascular disease with high mortality, and reperfusion is the current standard intervention. However, reperfusion may further induce cellular damage and dysfunction known as cerebral ischemia/reperfusion injury (CIRI). Currently, strategies for the clinical management of CIRI are limited, necessitating the exploration of novel and efficacious treatment modalities for the benefit of patients. PI3K/Akt signaling pathway is an important cellular process associated with the disease. Stimulation of the PI3K/Akt pathway enhances I/R injury in multiple organs such as heart, brain, lung, and liver. It stands as a pivotal signaling pathway crucial for diminishing cerebral infarction size and safeguarding the functionality of brain tissue after CIRI. During CIRI, activation of the PI3K/Akt pathway exhibits a protective effect on CIRI. Furthermore, activation of the PI3K/Akt pathway has the potential to augment the activity of antioxidant enzymes, resulting in a decrease in reactive oxygen species (ROS) and the associated oxidative stress. Meanwhile, PI3K/Akt plays a neuroprotective role by inhibiting inflammatory responses and apoptosis. For example, PI3K/Akt interacts with NF-κB, Nrf2, and MAPK signaling pathways to mitigate CIRI. This article is aimed to explore the pivotal role and underlying mechanism of PI3K/Akt in ameliorating CIRI and investigate the influence of ischemic preconditioning and post-processing, as well as the impact of pertinent drugs or activators targeting the PI3K/Akt pathway on CIRI. The primary objective is to furnish compelling evidence supporting the activation of PI3K/Akt in the context of CIRI, elucidating its mechanistic intricacies. By doing so, the paper aims to underscore the critical contribution of PI3K/Akt in mitigating CIRI, providing a theoretical foundation for considering the PI3K/Akt pathway as a viable target for CIRI treatment.
Language	English
Publishing date	2024-03-05
Publishing country	United States
Document type	Journal Article ; Review
ZDB-ID	645020-9
ISSN	1559-1182 ; 0893-7648
ISSN (online)	1559-1182
ISSN	0893-7648
DOI	10.1007/s12035-024-04039-1
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Article ; Online: A 3D-printed sub-atmospheric pressure electrospray ionization source for robust, facile, and flexible mass spectrometry analysis.

Hou, Mulang / Sun, Shuang / Zhu, Yanping / Yu, Quan

Analytical and bioanalytical chemistry

2023 Volume 415, Issue 26, Page(s) 6441–6448

Abstract: The operation and performance of electrospray ionization (ESI) is affected by the surrounding environment. In this study, a compact sub-atmospheric pressure ESI (SAP-ESI) source was designed and fabricated using the 3D printing method. This source has a ... ...

Abstract	The operation and performance of electrospray ionization (ESI) is affected by the surrounding environment. In this study, a compact sub-atmospheric pressure ESI (SAP-ESI) source was designed and fabricated using the 3D printing method. This source has a simple structure and is easy to operate, as the sample solution and auxiliary gas are continuously sucked into the source through the pressure difference. The compact and enclosed ionization chamber can reduce the fluctuation of the surrounding gas flow to ensure a remarkably stable (< 3%) electrospray. Moreover, the source can offer variable SAP conditions for ESI analysis. The yield of analyte ions increases with decreasing pressure, while the production of background ions is suppressed under these conditions. In the analysis of protein samples, SAP-ESI can increase the yield and charge state of ions, which may be due to the reduction of proton transfer between charged proteins and surrounding gas. The SAP-ESI source was then used to continuously monitor the extract aqueous solution of tea leaves, and to detect the carbendazim residues on the apple surface by coupling with the liquid extraction surface analysis technique. Experimental results demonstrate that the developed SAP-ESI is a stable, practical, and versatile ionization technique.
Language	English
Publishing date	2023-08-29
Publishing country	Germany
Document type	Journal Article
ZDB-ID	201093-8
ISSN	1618-2650 ; 0016-1152 ; 0372-7920
ISSN (online)	1618-2650
ISSN	0016-1152 ; 0372-7920
DOI	10.1007/s00216-023-04920-3
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Article: Tumor necrosis factor-α and procalcitonin level variations in the serum and their effects on organ function in patients with severe acute pancreatitis during infected stage.

Zhu, Yanping

Pakistan journal of pharmaceutical sciences

2017 Volume 30, Issue 4(Suppl.), Page(s) 1413–1416

Abstract: To investigate the changes of tumor necrosis factor-α (TNF-α) and procalcitonin (PCT) in the serum and their effects on organ function in patients with severe acute pancreatitis (SAP) during infected stage, aiming to provide a reference to individual ... ...

Abstract	To investigate the changes of tumor necrosis factor-α (TNF-α) and procalcitonin (PCT) in the serum and their effects on organ function in patients with severe acute pancreatitis (SAP) during infected stage, aiming to provide a reference to individual treatment. 32 patients with SAP during infected stage admitted to the Digestive Department of The Second Affiliated Hospital of Zhengzhou University from April 2014 to May 2015 and also 30 volunteer normal people were recruited in this study. And 26 patients detected with positive pathogenic bacteria were grouped into group A and another 6 patients with negative pathogenic bacteria into group B and 30 normal people into group C. And TNF-α and PCT level in the serum and the liver, kidney and lung function and the relationship between them of all the included people were compared and analyzed. the serum TNF-α level detected in the bile, urine and the surface of wound in group A was much higher than that in group B (P<0.05); and there was no significant difference in PCT between group A and group B; and TNF-α and PCT level in the serum in group A and group B were remarkably higher than group C (P<0.05). In addition, the organ function (the liver, kidney and lung) in the patients with high TNF-α level (High TNF-α group) was significantly different from the patients with low TNF-α level (Low TNF-α group) (P<0.05). And various organ functional indexes increased significantly in the patients with high PCT level (P<0.05). There were two kinds of TNF-α level (high level and low level) in the patients during SAP general infection stage, and the high level may reduce various organ function, the low level can contribute to the regular inflammatory response. And there is a high PCT level in the early SAP infection stage, which can be used to predict the patients' condition.
MeSH term(s)	Adult ; Aged ; Bacterial Infections/blood ; Bacterial Infections/diagnosis ; Bacterial Infections/microbiology ; Biomarkers/blood ; Case-Control Studies ; Female ; Humans ; Kidney Function Tests ; Liver Function Tests ; Male ; Middle Aged ; Pancreatitis, Acute Necrotizing/blood ; Pancreatitis, Acute Necrotizing/diagnosis ; Pancreatitis, Acute Necrotizing/microbiology ; Predictive Value of Tests ; Procalcitonin/blood ; Prognosis ; Respiratory Function Tests ; Severity of Illness Index ; Tumor Necrosis Factor-alpha/blood
Chemical Substances	Biomarkers ; Procalcitonin ; Tumor Necrosis Factor-alpha
Language	English
Publishing date	2017-10-18
Publishing country	Pakistan
Document type	Journal Article
ZDB-ID	885131-1
ISSN	1011-601X
ISSN	1011-601X
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Article ; Online: Hydrogen-Assisted Photoionization and Its Use in Promoting Mass Spectrometry Analysis of VOCs.

Zhu, Yanping / Aliang, Mushage / Wang, Xiaohao / Yu, Quan

Analytical chemistry

2023 Volume 95, Issue 47, Page(s) 17166–17169

Abstract: As a simple soft ionization method, photoionization (PI) is often coupled with mass spectrometry (MS) for the direct analysis of volatile organic compounds (VOCs). PI enables selective ionization of analytes, but the ion yield is generally not high due ... ...

Abstract	As a simple soft ionization method, photoionization (PI) is often coupled with mass spectrometry (MS) for the direct analysis of volatile organic compounds (VOCs). PI enables selective ionization of analytes, but the ion yield is generally not high due to the limited light intensity of the ultraviolet lamp. Here, a hydrogen-assisted photoionization (HAPI) strategy was developed and integrated into a miniature ion trap mass spectrometer. In particular, hydrogen was introduced as a versatile buffer gas to facilitate both photoionization and ion trap operation. This can increase the ion yields by up to 2 orders of magnitude compared to conventional PI-MS, with a low hydrogen consumption (less than 100 μL) for each analysis. The generation of protonated ions indicates a specific photochemical process in HAPI, which has also been studied and initially revealed. The detection of various VOCs and plant volatile gases confirmed the versatility and practicality of the HAPI technology.
Language	English
Publishing date	2023-11-15
Publishing country	United States
Document type	Journal Article
ZDB-ID	1508-8
ISSN	1520-6882 ; 0003-2700
ISSN (online)	1520-6882
ISSN	0003-2700
DOI	10.1021/acs.analchem.3c04650
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Article ; Online: Hydrogen-Assisted Photoionization and Its Use in Promoting Mass Spectrometry Analysis of VOCs

Zhu, Yanping / Aliang, Mushage / Wang, Xiaohao / Yu, Quan

Analytical Chemistry. 2023 Nov. 15, v. 95, no. 47, p. 17166-17169

2023 , Page(s) 17166–17169

Abstract	As a simple soft ionization method, photoionization (PI) is often coupled with mass spectrometry (MS) for the direct analysis of volatile organic compounds (VOCs). PI enables selective ionization of analytes, but the ion yield is generally not high due to the limited light intensity of the ultraviolet lamp. Here, a hydrogen-assisted photoionization (HAPI) strategy was developed and integrated into a miniature ion trap mass spectrometer. In particular, hydrogen was introduced as a versatile buffer gas to facilitate both photoionization and ion trap operation. This can increase the ion yields by up to 2 orders of magnitude compared to conventional PI-MS, with a low hydrogen consumption (less than 100 μL) for each analysis. The generation of protonated ions indicates a specific photochemical process in HAPI, which has also been studied and initially revealed. The detection of various VOCs and plant volatile gases confirmed the versatility and practicality of the HAPI technology.
Keywords	analytical chemistry ; chemical species ; hydrogen ; ionization ; light intensity ; mass spectrometry ; photochemistry ; spectrometers ; volatile organic compounds
Language	English
Dates of publication	2023-1115
Size	p. 17166-17169
Publishing place	American Chemical Society
Document type	Article ; Online
ZDB-ID	1508-8
ISSN	1520-6882 ; 0003-2700
ISSN (online)	1520-6882
ISSN	0003-2700
DOI	10.1021/acs.analchem.3c04650
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Article ; Online: Laser ultrasonic frequency-domain imaging and phase weighted optimization based on full matrix capture.

Liu, Zenghua / Chen, Long / Zhu, Yanping / Liu, Xiaoyu / Lu, Zhaojing / He, Cunfu

Ultrasonics

2024 Volume 141, Page(s) 107321

Abstract: Far-field laser technology has greatly promoted the progress of nondestructive ultrasonic imaging of bulk structures. However, under thermoelastic excitation, the body waves exhibit a relatively low signal-to-noise ratio, resulting in images with low ... ...

Abstract	Far-field laser technology has greatly promoted the progress of nondestructive ultrasonic imaging of bulk structures. However, under thermoelastic excitation, the body waves exhibit a relatively low signal-to-noise ratio, resulting in images with low resolution and contrast. Based on the motivation, this paper developed a frequency-domain phase weighted imaging method to improve the quality of laser ultrasonic defect imaging. Firstly, laser ultrasonic scanning was performed on the sample with artificial transverse hole defects. The cylindrical lens focused line source was used to improve the intensity of the body wave signals, and ensure that there was no damage on the material surface under high laser energies. Then, the frequency-domain phase shift migration (PSM) algorithm was used to perform multimode imaging of defects, achieving frequency-domain synthetic aperture focusing technique (F-SAFT) and total focused method (F-TFM) imaging based on full matrix capture. Furthermore, the phase circular statistical vector (PCSV) was proposed for weighted optimization, which improved the image quality, suppressed the background noise and multimode artifacts. Finally, the imaging quality of several algorithms were discussed. The results indicate that frequency-domain images were superior to time-domain results. After phase weighting, the imaging quality can be further improved, and the detection blind zone was significantly reduced. This work will contribute to the rapid and high-quality defect imaging of laser ultrasonic.
Language	English
Publishing date	2024-04-20
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	200839-7
ISSN	1874-9968 ; 0041-624X
ISSN (online)	1874-9968
ISSN	0041-624X
DOI	10.1016/j.ultras.2024.107321
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