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https://www.readbyqxmd.com/read/28918325/a-novel-lc-ms-ms-method-for-the-quantitative-measurement-of-the-acetate-content-in-pharmaceutical-peptides
#1
Rani J Qasem, Ibrahim K Farh, Mohammed A Al Essa
Most pharmaceutical peptides are supplied as acetate salts and the relative amount of acetate to peptide in the final product is one quality criterion required by regulatory agencies to approve the product for clinical use. The objective of the present study was to develop a validated LC-MS/MS method that allows the quantitative determination of the acetate content in pharmaceutical peptide preparations and simultaneous monitoring and collection of qualitative and quantitative information on the peptide during manufacture and in the final product...
September 6, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28918323/quantitative-determination-of-carfilzomib-in-mouse-plasma-by-liquid-chromatography-tandem-mass-spectrometry-and-its-application-to-a-pharmacokinetic-study
#2
Jee Sun Min, Jiseon Kim, Jung Ho Kim, Doyun Kim, Yu Fen Zheng, Ji Eun Park, Wooin Lee, Soo Kyung Bae
A highly sensitive and rapid LC-MS/MS method was developed and validated to determine the levels of carfilzomib in mice plasma by using chlorpropamide as an internal standard. Carfilzomib and chlorpropamide were extracted from 5 μL of plasma after protein precipitation with acetonitrile. Chromatographic separation was performed on Phenomenex Luna C18 column (50×2.0mm id, 3μm). The mobile phase consisted of 0.1% formic acid in acetonitrile -0.1% formic acid in water (1:1v/v) and the flow rate was 0.3mL/min...
September 1, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28918221/a-10-minute-measure-of-global-cognition-validation-of-the-brief-cognitive-assessment-tool-for-schizophrenia-b-cats
#3
Irene M Hurford, Joseph Ventura, Stephen R Marder, Steven P Reise, Robert M Bilder
INTRODUCTION: Schizophrenia is marked by a global cognitive impairment that contributes significantly to chronic disability and unemployment. As new treatments are developed for cognition in schizophrenia, clinicians require easily administered instruments to assess cognition. We previously developed a very brief cognitive battery (Bell et al., 2005). The Brief Cognitive Assessment Tool for Schizophrenia (B-CATS) was developed specifically to provide clinicians with a way to assess cognition in their patients with schizophrenia...
September 13, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28917757/innovative-thin-layer-chromatographic-method-combined-with-fluorescence-detection-for-specific-determination-of-febuxostat-application-in-biological-fluids
#4
Abdel-Maaboud I Mohamed, Mahmoud A Omar, Sayed M Derayea, Mohamed A Hammad, Abobakr A Mohamed
A newly developed thin-layer chromatographic (TLC) method coupled with fluorescence detection for specific determination of Febuxostat (FEB) was designed. The proposed method adopts exposure of FEB on a developed TLC plate to hydrochloric acid vapors, resulting in a large enhancement of its weak fluorescence, permitting its specific and sensitive determination in real human plasma and urine after excitation at 345nm on 60 F254 silica gel plates using toluene-ethyl acetate-methanol-glacial acetic acid; (30:10:5:0...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917221/determining-the-predictive-equation-for-height-from-ulnar-length-in-the-vietnamese-population
#5
Ana Bonell, Nguyen Nguyen Huyen, Vu Dinh Phu, Heiman Wertheim, Behzad Nadjm
BACKGROUND AND OBJECTIVES: Height is an essential measurement in clinical medicine. It allows the calculation of body mass index, ideal body weight, basic energy requirements and tidal volumes. In many patient groups, such as the critically ill, height cannot be measured easily and surrogate anthropometric measures are used. Regression equations estimating height are specific to ethnicity. We aimed to develop the regression equation for Vietnamese men and women to predict height from ulna length and so improve prescription of life-saving treatment in the intensive care units...
2017: Asia Pacific Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28917164/uplc-ms-ms-assay-of-riluzole-in-human-plasma-and-cerebrospinal-fluid-csf-application-in-samples-from-spinal-cord-injured-patients
#6
Mahua Sarkar, Robert G Grossman, Elizabeth G Toups, Diana S-L Chow
In the present study, a sensitive and robust LC-MS/MS method has been developed and validated for the quantification of riluzole in human plasma and cerebrospinal fluid (CSF) in clinical samples from patients with spinal cord injury (SCI). Riluzole and its labeled internal standard (IS) were isolated from plasma and CSF by liquid-liquid extraction using ethyl acetate. Riluzole (m/z 235→166) and IS (m/z 238→169) were detected by electrospray ionization (ESI) using multiple reaction monitoring (MRM) in a positive mode...
September 1, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28917134/the-development-of-the-dutch-version-of-the-fremantle-back-awareness-questionnaire
#7
Lotte Janssens, Nina Goossens, Benedict M Wand, Madelon Pijnenburg, Tinne Thys, Simon Brumagne
BACKGROUND: Disturbed body perception may play a role in the aetiology of chronic low back pain (LBP). The Fremantle Back Awareness Questionnaire (FreBAQ) is currently the only self-report questionnaire to assess back-specific body perception in individuals with LBP. OBJECTIVES: To perform a cross-cultural adaptation of the FreBAQ into Dutch. DESIGN: Psychometric study. METHODS: A Dutch version of the FreBAQ was generated through forward-backward translation, and was completed by 73 patients with LBP and 73 controls to assess discriminant validity...
September 7, 2017: Musculoskeletal Science & Practice
https://www.readbyqxmd.com/read/28917131/the-development-and-psychometric-testing-of-a-disaster-response-self-efficacy-scale-among-undergraduate-nursing-students
#8
Hong-Yan Li, Rui-Xue Bi, Qing-Ling Zhong
BACKGROUND: Disaster nurse education has received increasing importance in China. Knowing the abilities of disaster response in undergraduate nursing students is beneficial to promote teaching and learning. However, there are few valid and reliable tools that measure the abilities of disaster response in undergraduate nursing students. OBJECTIVES: To develop a self-report scale of self-efficacy in disaster response for Chinese undergraduate nursing students and test its psychometric properties...
July 29, 2017: Nurse Education Today
https://www.readbyqxmd.com/read/28915942/development-of-a-validated-lc-ms-ms-method-for-the-quantification-of-19-endogenous-asthma-copd-potential-urinary-biomarkers
#9
Mona M Khamis, Darryl J Adamko, Anas El-Aneed
Obstructive airways inflammatory diseases sometimes show overlapping symptoms that hinder their early and correct diagnosis. Current clinical tests are tedious and are of inadequate specificity in special population such as the elderly and children. Therefore, we are developing tandem mass spectrometric (MS/MS) methods for targeted analysis of urine biomarkers. Recently, proton-nuclear magnetic resonance ((1)H-NMR) analysis proposed 50 urinary metabolites as potential diagnostic biomarkers among asthma and chronic obstructive pulmonary disease (COPD) patients...
October 9, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28915903/a-quantitative-assessment-of-the-evolution-of-cerebellar-syndrome-in-children-with-phosphomannomutase-deficiency-pmm2-cdg
#10
Natalia Lourdes Serrano, Victor De Diego, Daniel Cuadras, Antonio F Martinez Monseny, Ramón Velázquez-Fragua, Laura López, Ana Felipe, Luis G Gutiérrez-Solana, Alfons Macaya, Belén Pérez-Dueñas, Mercedes Serrano
BACKGROUND: We aim to delineate the progression of cerebellar syndrome in children with phosphomannomutase-deficiency (PMM2-CDG) using the International Cooperative Ataxia Rating Scale (ICARS). We sought correlation between cerebellar volumetry and clinical situation. We prospectively evaluated PMM2-CDG patients aged from 5 to 18 years through ICARS at two different time points set apart by at least 20 months. We reviewed available MRIs and performed volumetric analysis when it was possible...
September 15, 2017: Orphanet Journal of Rare Diseases
https://www.readbyqxmd.com/read/28915891/inflammatory-bowel-disease-specific-health-related-quality-of-life-instruments-a-systematic-review-of-measurement-properties
#11
REVIEW
Xin-Lin Chen, Liang-Huan Zhong, Yi Wen, Tian-Wen Liu, Xiao-Ying Li, Zheng-Kun Hou, Yue Hu, Chuan-Wei Mo, Feng-Bin Liu
BACKGROUND: This review aims to critically appraise and compare the measurement properties of inflammatory bowel disease (IBD)-specific health-related quality of life instruments. METHODS: Medline, EMBASE and ISI Web of Knowledge were searched from their inception to May 2016. IBD-specific instruments for patients with Crohn's disease, ulcerative colitis or IBD were enrolled. The basic characteristics and domains of the instruments were collected. The methodological quality of measurement properties and measurement properties of the instruments were assessed...
September 15, 2017: Health and Quality of Life Outcomes
https://www.readbyqxmd.com/read/28915857/validity-and-reproducibility-of-a-short-food-frequency-questionnaire-among-patients-with-chronic-kidney-disease
#12
Aurélie Affret, Sandra Wagner, Douae El Fatouhi, Courtney Dow, Emmanuelle Correia, Maryvonne Niravong, Françoise Clavel-Chapelon, Julie De Chefdebien, Denis Fouque, Bénédicte Stengel, Marie-Christine Boutron-Ruault, Guy Fagherazzi
BACKGROUND: A balanced diet is essential to slowing the progression of chronic kidney disease (CKD) and managing the symptoms. Currently, no tool is available to easily and quickly assess energy and macronutrient intake in patients with non end-stage CKD. We aimed to develop and evaluate the validity and reproducibility of a new short 49-item food frequency questionnaire (SFFQ) adapted to patients with CKD. METHODS: The CKD-REIN study is a prospective cohort that enrolled 3033 patients with moderate or advanced CKD from a national sample of nephrology clinics...
September 15, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/28915845/reliability-and-validity-of-a-brief-sleep-questionnaire-for-children-in-japan
#13
Masakazu Okada, Shingo Kitamura, Yoshitaka Iwadare, Hisateru Tachimori, Yuichi Kamei, Shigekazu Higuchi, Kazuo Mishima
BACKGROUND: There is a dearth of sleep questionnaires with few items and confirmed reliability and validity that can be used for the early detection of sleep problems in children. The aim of this study was to develop a questionnaire with few items and assess its reliability and validity in both children at high risk of sleep disorders and a community population. METHODS: Data for analysis were derived from two populations targeted by the Children's Sleep Habits Questionnaire (CSHQ): 178 children attending elementary school and 432 children who visited a pediatric psychiatric hospital (aged 6-12 years)...
September 15, 2017: Journal of Physiological Anthropology
https://www.readbyqxmd.com/read/28915820/item-response-modeling-a-psychometric-assessment-of-the-children-s-fruit-vegetable-water-and-physical-activity-self-efficacy-scales-among-chinese-children
#14
Jing-Jing Wang, Tzu-An Chen, Tom Baranowski, Patrick W C Lau
BACKGROUND: This study aimed to evaluate the psychometric properties of four self-efficacy scales (i.e., self-efficacy for fruit (FSE), vegetable (VSE), and water (WSE) intakes, and physical activity (PASE)) and to investigate their differences in item functioning across sex, age, and body weight status groups using item response modeling (IRM) and differential item functioning (DIF). METHODS: Four self-efficacy scales were administrated to 763 Hong Kong Chinese children (55...
September 16, 2017: International Journal of Behavioral Nutrition and Physical Activity
https://www.readbyqxmd.com/read/28915422/determination-of-hydroxyurea-in-human-plasma-by-hplc-uv-using-derivatization-with-xanthydrol
#15
Tiphaine Legrand, Marie-Georgine Rakotoson, Frédéric Galactéros, Pablo Bartolucci, Anne Hulin
A simple and rapid high performance liquid chromatography (HPLC) method using ultraviolet (UV) detection was developed to determine hydroxyurea (HU) concentration in plasma sample after derivatization with xanthydrol. Two hundred microliters samples were spiked with methylurea (MeU) as internal standard and proteins were precipitated by adding methanol. Derivatization of HU and MeU was immediately performed by adding 0.02M xanthydrol and 1.5M HCl in order to obtain xanthyl-derivatives of HU and MeU that can be further separated using HPLC and quantified using UV detection at 240nm...
September 7, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28915419/sensitivity-improvement-of-the-lc-ms-ms-quantification-of-carbidopa-in-human-plasma-and-urine-by-derivatization-with-2-4-pentanedione
#16
Nico C van de Merbel, Kees J Bronsema, Steven H Gorman, Ray Bakhtiar
The reliable quantification of carbidopa in biological samples at low concentrations is challenging because of the polar and highly unstable nature of the compound. In this paper, LC-MS/MS methods are described for the determination of carbidopa in 50μL of human plasma and 25μL of human urine in the concentration ranges 1-1,000ng/mL and 100-50,000ng/mL, respectively. After a simple protein precipitation (plasma) or dilution (urine) step, carbidopa is derivatized at its hydrazine moiety by reaction for one hour with 2,4-pentanedione under acidic conditions and at 40°C...
September 8, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28915416/methodological-approaches-in-analysing-observational-data-a-practical-example-on-how-to-address-clustering-and-selection-bias
#17
Diana Trutschel, Rebecca Palm, Bernhard Holle, Michael Simon
BACKGROUND: Because not every scientific question on effectiveness can be answered with randomised controlled trials, research methods that minimise bias in observational studies are required. Two major concerns influence the internal validity of effect estimates: selection bias and clustering. Hence, to reduce the bias of the effect estimates, more sophisticated statistical methods are needed. AIM: To introduce statistical approaches such as propensity score matching and mixed models into representative real-world analysis and to conduct the implementation in statistical software R to reproduce the results...
July 20, 2017: International Journal of Nursing Studies
https://www.readbyqxmd.com/read/28915376/psychometric-properties-of-the-postpartum-bonding-questionnaire-and-correlates-of-mother-infant-bonding-impairment-in-italian-new-mothers
#18
Alessandra Busonera, Stefania Cataudella, Jessica Lampis, Marco Tommasi, Giulio Cesare Zavattini
OBJECTIVE: impaired maternal bonding is a risk factor for problems with infant well-being and development. The investigation of perinatal variables related to disorders of the mother-infant relationship as well as the administration of reliable and valid screening tools to new mothers in the postpartum can help identify early signs of a disturbed mother-child relationship. The Postpartum Bonding Questionnaire (PBQ) has been shown to be a valid screening instrument, but its dimensional structure is still controversial...
September 1, 2017: Midwifery
https://www.readbyqxmd.com/read/28914158/studying-positive-and-negative-direct-and-extended-contact-complementing-self-reports-with-social-network-analysis
#19
Ralf Wölfer, Eva Jaspers, Danielle Blaylock, Clarissa Wigoder, Joanne Hughes, Miles Hewstone
Traditionally, studies of intergroup contact have primarily relied on self-reports, which constitute a valid method for studying intergroup contact, but has limitations, especially if researchers are interested in negative or extended contact. In three studies, we apply social network analyses to generate alternative contact parameters. Studies 1 and 2 examine self-reported and network-based parameters of positive and negative contact using cross-sectional datasets ( N = 291, N = 258), indicating that both methods help explain intergroup relations...
July 1, 2017: Personality & Social Psychology Bulletin
https://www.readbyqxmd.com/read/28914116/defining-a-core-outcome-set-for-adolescent-and-young-adult-patients-with-a-spinal-deformity
#20
Marinus de Kleuver, Sayf S A Faraj, Roderick M Holewijn, Niccole M Germscheid, Raphael D Adobor, Mikkel Andersen, Hans Tropp, Benny Dahl, Heli Keskinen, Anders Olai, David W Polly, Miranda L van Hooff, Tsjitske M Haanstra
Background and purpose - Routine outcome measurement has been shown to improve performance in several fields of healthcare. National spine surgery registries have been initiated in 5 Nordic countries. However, there is no agreement on which outcomes are essential to measure for adolescent and young adult patients with a spinal deformity. The aim of this study was to develop a core outcome set (COS) that will facilitate benchmarking within and between the 5 countries of the Nordic Spinal Deformity Society (NSDS) and other registries worldwide...
September 15, 2017: Acta Orthopaedica
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