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High performance liquid chromatography

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https://www.readbyqxmd.com/read/28438013/characterization-of-newly-bred-cordyceps-militaris-strains-for-higher-production-of-cordycepin-through-hplc-and-urp-pcr-analysis
#1
Hyun-Hee Lee, Naru Kang, Inmyoung Park, Jungwook Park, Inyoung Kim, Jieun Kim, Namgyu Kim, Jae-Yun Lee, Young-Su Seo
Cordyceps militaris, a member of Ascomycota, a mushroom referred to as caterpillar Dong-chung-ha-cho, is commercially valuable because of its high content of bioactive substances including cordycepin and its potential for artificial cultivation. Cordycepin (3'-deoxyadenosine) is highly associated with the pharmacological effects of C. militaris. C. militaris is heterothallic in that two mating type loci, idiomorph MAT1-1 and MAT1-2, exist discretely in two different spores. In this study, nine C. militaris strains were mated with each other to prepare new strains that produced a larger amount of cordycepin than the parent strains...
April 25, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28437718/nontargeted-metabolomics-approach-for-the-differentiation-of-cultivation-ages-of-mountain-cultivated-ginseng-leaves-using-uhplc-qtof-ms
#2
Xiangwei Chang, Juanjuan Zhang, Dekun Li, Dazheng Zhou, Yuling Zhang, Jincheng Wang, Bing Hu, Aichun Ju, Zhengliang Ye
The adulteration or falsification of the cultivation age of mountain cultivated ginseng (MCG) has been a serious problem in the commercial MCG market. To develop an efficient discrimination tool for the cultivation age and to explore potential age-dependent markers, an optimized ultra high-performance liquid chromatography/quadrupole time-of-flight mass spectrometry (UHPLC/QTOF-MS)-based metabolomics approach was applied in the global metabolite profiling of 156 MCG leaf (MGL) samples aged from 6 to 18 years...
April 13, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28437688/application-of-near-infrared-spectroscopy-for-the-rapid-quality-assessment-of-radix-paeoniae-rubra
#3
Hao Zhan, Jing Fang, Liying Tang, Hongjun Yang, Hua Li, Zhuju Wang, Bin Yang, Hongwei Wu, Meihong Fu
Near-infrared (NIR) spectroscopy with multivariate analysis was used to quantify gallic acid, catechin, albiflorin, and paeoniflorin in Radix Paeoniae Rubra, and the feasibility to classify the samples originating from different areas was investigated. A new high-performance liquid chromatography method was developed and validated to analyze gallic acid, catechin, albiflorin, and paeoniflorin in Radix Paeoniae Rubra as the reference. Partial least squares (PLS), principal component regression (PCR), and stepwise multivariate linear regression (SMLR) were performed to calibrate the regression model...
April 20, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28436648/statistical-variable-selection-an-alternative-prioritization-strategy-during-the-non-target-analysis-of-lc-hr-ms-data
#4
Saer Samanipour, Malcolm J Reid, Kevin V Thomas
Liquid chromatography coupled to high resolution mass spectrometry (LC-HR-MS) has been one of the main analytical tools for the analysis of small polar organic pollutants in the environment. LC-HR-MS typically produces a large amount of data for a single chromatogram. The analyst is therefore required to perform prioritization prior to non-target structural elucidation. In the present study we have combined the F-ratio statistical variable selection and the apex detection algorithms in order to perform prioritization in data sets produced via LC-HR-MS...
April 24, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28436161/dispersive-liquid-liquid-microextraction-as-an-effective-pre-analytical-step-for-the-determination-of-estradiol-in-human-urine
#5
Elena Kupcová, Katarína Reiffová
In this work, a fast and effective dispersive liquid-liquid microextraction was developed for the isolation and pre-concentration of free 17β-estradiol, the main human estrogen, from real human urine samples. To optimize the extraction technique, few important parameters such as type and volume of extraction and dispersive solvents, centrifugation conditions, effect of salt addition, and extraction time were studied. Optimal conditions were obtained when injecting 600 μL mixture of tetrachloromethane as extraction solvent and ethanol as dispersive solvent (1:5; v/v) into 2 mL of urine containing 8% NaCl and following centrifugation at 10 000 rpm, thus reaching enrichment factor 28 and extraction recovery 98% for estradiol...
April 24, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28436147/rapid-detection-of-six-phosphodiesterase-type-5-enzyme-inhibitors-in-health-care-products-using-thin-layer-chromatography-and-surface-enhanced-raman-spectroscopy-combined-with-bp-neural-network
#6
Xiaopeng Hu, Guozhen Fang, Ailing Han, Yunpeng Fu, Rui Tong, Shuo Wang
A novel facile method for the detection of the phosphodiesterase type 5 enzyme inhibitors added illegally into health products was established using thin-layer chromatography and surface enhanced Raman spectroscopy combined with BP neural network. When the detecting conditions were optimized in detail, a repetitive adding procedure of silver colloids with the total amount keeping constant was used to improve the enhancement effect of surface enhanced Raman spectroscopy. According to the main Raman peaks and the retention factor of analyte, the data predictive model was established...
April 24, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28435974/-antidepressant-effects-of-the-extract-of-dendrobium-nobile-lindl-on-chronic-unpredictable-mild-stress-induced-depressive-mice
#7
Ning Jiang, Lin-Xi Fan, Yu-Jie Yang, Xin-Min Liu, Hai-Ying Lin, Li Gao, Qiong Wang
To investigate whether the extract of Dendrobium nobile Lindl (DNL) has an antidepressant effect on chronic unpredictable mild stress (CUMS)-induced depressive mice, 72 BALB/c male mice were randomly divided into the control group, the CUMS model group, the extract of DNL groups (50, 100 and 200 mg/kg DNL, i.g.) and the paroxetine group (10 mg/kg, i.g.). The different doses of DNL or the paroxetine was administered orally once daily to CUMS mice for 8 weeks (containing two-week preventive medication before the modeling)...
April 25, 2017: Sheng Li Xue Bao: [Acta Physiologica Sinica]
https://www.readbyqxmd.com/read/28435354/control-efficacy-of-streptomyces-sp-a501-against-ginseng-damping-off-and-its-antifungal-substance
#8
Nguyen Van Minh, E-Eum Woo, Gang-Seon Lee, Dae-Won Ki, In-Kyoung Lee, Sang-Yeob Lee, Kyeonghun Park, Jaekyeong Song, Jae Eul Choi, Bong-Sik Yun
Ginseng damping-off, caused by the fungal pathogens Rhizoctonia solani and Pythium sp., is a critical disease in ginseng seedling. In a continuing effort to find microorganisms with the potential of acting as a biocontrol agent against Rhizoctonia damping-off, we found that a Streptomyces sp. A501 showed significant antifungal activity against Rhizoctonia solani. In field experiment to test the efficacy of Streptomyces sp. A501 in controlling ginseng damping-off, the incidence of damping-off disease was meaningfully reduced when ginseng seeds were soaked in the culture broth of Streptomyces sp...
March 2017: Mycobiology
https://www.readbyqxmd.com/read/28435276/clinical-and-biochemical-study-of-d-serine-metabolism-among-schizophrenia-patients
#9
Hamdy N El-Tallawy, Tahia H Saleem, Abdallah Maa El-Ebidi, Mohammed H Hassan, Romany H Gabra, Wafaa Ma Farghaly, Nagwa Abo El-Maali, Hoda S Sherkawy
BACKGROUND: Schizophrenia is a typical N-methyl-d-aspartate receptor (NMDA-R) hypofunction disorder. Decreased d-serine (d-Ser) levels in the periphery occur in schizophrenia and may reflect decreased availability of d-Ser to activate NMDA-R in the brain. OBJECTIVE: The objective of this study was to investigate the role of d-Ser metabolism in the pathogenesis of schizophrenia via biochemical assays and correlates, the serum level of d-Ser, d-serine racemase (SR) (responsible for its formation from l-serine [l-Ser]) and d-amino acid oxidase (DAAO) (responsible for its catabolism), among different clinical types of schizophrenia patients...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/28435106/comparative-proteome-analysis-of-the-hepatopancreas-from-the-pacific-white-shrimp-litopenaeus-vannamei-under-long-term-low-salinity-stress
#10
Chang Xu, Erchao Li, Yan Liu, Xiaodan Wang, Jian G Qin, Liqiao Chen
Litopenaeus vannamei is a typical euryhaline decapod model to study the osmoregulation mechanism in crustaceans. The proteomic was undertaken using isobaric tags for relative and absolute quantification together with the reverse phase in high-performance liquid chromatography mass spectrometry to quantitatively identify the proteins differentially expressed in the hepatopancreas under low salinity stress (3psu) compared with the control salinity (25psu). 533 proteins and 84 differentially expressed proteins were identified including 58 proteins with the 1...
April 18, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28434790/short-n-terminal-galanin-fragments-are-occurring-naturally-in-vivo
#11
Robert Ihnatko, Elvar Theodorsson
The galanin family currently consists of four peptides, namely galanin, galanin-message associated peptide, galanin-like peptide and alarin. Unlike galanin that signals through three different G protein-coupled receptors; GAL1, GAL2, and GAL3, binding at its N-terminal end, the cognate receptors for other members of the galanin family are currently unknown. Research using short N-terminal galanin fragments generated either by enzymatic cleavage or solid-phase synthesis has revealed differences in their receptor binding properties exerting numerous biological effects distinct from galanin(1-29) itself...
April 7, 2017: Neuropeptides
https://www.readbyqxmd.com/read/28434712/evidence-for-an-imidazoline-by-product-from-glycans-using-tandem-mass-spectrometry
#12
Robert J Duff, Elaine Smith, Wenzhou Li, Szilan Fodor
Herein is reported the separation and identification of a previously unknown imidazoline by-product originating from the fluorescent labeling procedure when applied to enzymatically released N-linked glycans of a human IgG1. The imidazoline by-product was generated via the reductive amination procedure with either sodium cyanoborohydride or 2-picoline borane. Using ultra performance liquid chromatography (UPLC) in conjunction with hydrophilic interaction-based chromatography (HILIC), the 2-aminobenzoic acid (2-AA)-labeled glycans were well-resolved from imidazoline by-products to facilitate direct identification utilizing electrospray ionization mass spectrometry (ESI-MS) with fragmentation...
April 18, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28434711/validation-of-an-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry-method-to-quantify-illicit-drug-and-pharmaceutical-residues-in-wastewater-using-accuracy-profile-approach
#13
Cécile Hubert, Martin Roosen, Yves Levi, Sara Karolak
The analysis of biomarkers in wastewater has become a common approach to assess community behavior. This method is an interesting way to estimate illicit drug consumption in a given population: by using a back calculation method, it is therefore possible to quantify the amount of a specific drug used in a community and to assess the consumption variation at different times and locations. Such a method needs reliable analytical data since the determination of a concentration in the ngL(-1) range in a complex matrix is difficult and not easily reproducible...
April 15, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28434171/peroxidatic-cysteine-residue-of-peroxiredoxin-2-separated-from-human-red-blood-cells-treated-by-tert-butyl-hydroperoxide-is-hyperoxidized-into-sulfinic-and-sulfonic-acids
#14
Yo-Ichi Ishida, Mariko Aki, Sohta Fujiwara, Masami Nagahama, Yuki Ogasawara
Peroxiredoxin 2 (Prx2) is a redox enzyme that is abundantly expressed in red blood cells (RBCs) and has been the focus of clinical attention for monitoring the oxidative status. We previously developed a method to quantify the reduced and hyperoxidized forms of Prx2 in human RBCs using reverse-phase high-performance liquid chromatography (HPLC). In the present study, we investigated the hyperoxidative status of Prx2 at the molecular level in a post-translational modification analysis using a liquid chromatography-tandem mass spectrometry (LC-MS/MS) system...
April 22, 2017: Human Cell
https://www.readbyqxmd.com/read/28433954/lipidomic-profile-in-three-species-of-dinoflagellates-amphidinium-carterae-cystodinium-sp-and-peridinium-aciculiferum-containing-very-long-chain-polyunsaturated-fatty-acids
#15
Tomáš Řezanka, Jaromír Lukavský, Linda Nedbalová, Karel Sigler
This study describes the identification of very long chain polyunsaturated fatty acids (VLCPUFAs) in three strains of dinoflagellates (Amphidinium carterae, Cystodinium sp., and Peridinium aciculiferum). The strains were cultivated and their lipidomic profiles were obtained by high resolution mass spectrometry with the aid of positive and negative electrospray ionization (ESI) mode by Orbitrap apparatus. Hydrophilic interaction liquid chromatography (HILIC/ESI) was used to separate major lipid classes of the three genera of dinoflagellates by neutral loss scan showing the ion [M + H-28:8](+), where 28:8 was octacosaoctaenoic acid, and by precursor ion scanning of ions at m/z 407, which was an ion corresponding to the structure of acyl of 28:8 acid (C27H39COO(-))...
April 20, 2017: Phytochemistry
https://www.readbyqxmd.com/read/28433874/systematically-characterize-the-absorbed-effective-substances-of-wutou-decoction-and-their-metabolic-pathways-in-rat-plasma-using-uhplc-q-tof-ms-combined-with-a-target-network-pharmacological-analysis
#16
Tengfei Xu, Shizhe Li, Yufei Sun, Zifeng Pi, Shu Liu, Fengrui Song, Zhiqiang Liu
Wu-tou Decoction (WTD) is a famous traditional Chinese medicine (TCM) formula which is applied to treat arthritis and pain of joints. In this study, a sensitive and rapid method was developed for the separation and identification of the absorbed constituents and metabolites of WTD in the rats plasma by ultra high-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UHPLC-Q-TOF-MS). A total of 22 absorbed prototype constituents and 49 metabolites were identified or tentatively characterized in dosed plasma...
April 13, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28433761/a-glycoproteomic-approach-reveals-that-the-s-layer-glycoprotein-of-lactobacillus-kefiri-cidca-83111-is-o-and-n-glycosylated
#17
Gustavo J Cavallero, Mariano Malamud, Adriana C Casabuono, M de Los Ángeles Serradell, Alicia S Couto
In Gram-positive bacteria, such as lactic acid bacteria, general glycosylation systems have not been documented so far. The aim of this work was to characterize in detail the glycosylation of the S-layer protein of Lactobacillus kefiri CIDCA 83111. A reductive β-elimination treatment followed by anion exchange high performance liquid chromatography analysis was useful to characterize the O-glycosidic structures. MALDI-TOF mass spectrometry analysis confirmed the presence of oligosaccharides bearing from 5 to 8 glucose units carrying galacturonic acid...
April 19, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28433619/lack-of-pathogenic-mutations-in-sos1-gene-in-phenytoin-induced-gingival-overgrowth-patients
#18
Katia Margiotti, Giulia Pascolini, Federica Consoli, Valentina Guida, Carlo Di Bonaventura, Anna Teresa Giallonardo, Antonio Pizzuti, Alessandro De Luca
OBJECTIVE: Gingival overgrowth is a side effect associated with some distinct classes of drugs, such as anticonvulsants, immunosuppressants, and calcium channel blockers. One of the main drugs associated with gingival overgrowth is the antiepileptic phenytoin, which affects gingival tissues by altering extracellular matrix metabolism. It has been shown that mutation of human SOS1 gene is responsible for a rare hereditary gingival fibromatosis type 1, a benign gingival overgrowth. The aim of the present study is to evaluate the possible contribution of SOS1 mutation to gingival overgrowth-related phenotype...
April 5, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28433609/hb-moncloa-a-new-variant-of-haemoglobin-that-interferes-in-the-quantification-of-hb-a1c
#19
Torrejón María Josefa, Ortíz-Cabrera N Valentina, M Nieto Jorge, González Fernández Fernando-Ataúlfo, Villegas Ana, Martínez Rafael, Ropero Paloma
BACKGROUND: In most routine laboratories in Spain, the commonly used method for evaluating HbA1c is ion-exchange high performance liquid chromatography (HPLC). The presence of a variant of Hb may interfere with the quantification of HbA1c. AIMS: Here, we report a novel haemoglobin variant, named Hb Moncloa, which was found during a routine health check at the Hospital Clínico San Carlos in Moncloa (Madrid), Spain. METHODS AND RESULTS: Molecular characterization of β gene identified a novel transversion mutation [β80(EF4)Asn>Ser; HBB:c...
April 19, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28433521/determination-of-cyclopeptide-toxins-in-amanita-subpallidorosea-and-amanita-virosa-by-high-performance-liquid-chromatography-coupled-with-high-resolution-mass-spectrometry
#20
Jiahui Wei, Jianfeng Wu, Jia Chen, Bidong Wu, Zhengmi He, Ping Zhang, Haijiao Li, Chengye Sun, Chang Liu, Zuohong Chen, Jianwei Xie
Amanita subpallidorosea is a recently discovered lethal Amanita sect. Phalloideae species found in China that is clustered with A. virosa in the same clade based on molecular phylogenetic analysis. However, the cyclopeptide toxin contents of these lethal mushrooms remain poorly studied. In this study, the cyclopeptide toxins in A. subpallidorosea were reported for the first time and the cyclopeptide compositions of A. subpallidorosea and A. virosa species were systematically analyzed. Thirteen cyclopeptides and two unknown compounds were identified or observed from these two lethal mushrooms by high-performance liquid chromatography coupled with high-resolution mass spectrometry...
April 19, 2017: Toxicon: Official Journal of the International Society on Toxinology
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