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chemiluminescence immunoassay

Martina Zangheri, Fabio Di Nardo, Mara Mirasoli, Laura Anfossi, Augusto Nascetti, Domenico Caputo, Giampiero De Cesare, Massimo Guardigli, Claudio Baggiani, Aldo Roda
A novel and disposable cartridge for chemiluminescent (CL)-lateral flow immunoassay (LFIA) with integrated amorphous silicon (a-Si:H) photosensors array was developed and applied to quantitatively detect human serum albumin (HSA) in urine samples. The presented analytical method is based on an indirect competitive immunoassay using horseradish peroxidase (HRP) as a tracer, which is detected by adding the luminol/enhancer/hydrogen peroxide CL cocktail. The system comprises an array of a-Si:H photosensors deposited on a glass substrate, on which a PDMS cartridge that houses the LFIA strip and the reagents necessary for the CL immunoassay was optically coupled to obtain an integrated analytical device controlled by a portable read-out electronics...
October 25, 2016: Analytical and Bioanalytical Chemistry
Shu-Zi Zheng, Da-Guan Zhang, Hao Wu, Li-Jia Jiang, Jie Jin, Xiu-Qing Lin, Ran Ding, Yi Jiang
There is now growing evidence suggesting that Vitamin D is playing a critical role in modulating the innate and adaptive immune responses. Several polymorphisms have been identified in the vitamin D receptor (VDR) gene but their association with ulcerative colitis (UC) susceptibility remained controversy. In the current study, we examined the association between VDR polymorphisms and serum level of 25-hydroxyvitamin D [25(OH)D] with UC in Chinese Han population. Polymorphisms of FokI (rs2228570)/BsmI (rs1544410)/ApaI (rs7975232)/TaqI (rs731236) in the VDR gene were assessed in a case-control study comprising 404 UC patients and 612 controls...
October 19, 2016: Clinics and Research in Hepatology and Gastroenterology
Manwen Yao, Linyu Wang, Chengzhi Fang
A rapid and sensitive chemiluminescence immunoassay (CLIA) based on magnetic nanoparticles (MNPs) was developed to detect aflatoxin B1 (AFB1), which is a potent carcinogen in nature. We prepared monodisperse MNPs (300 nm in diameter) according to the solvothermal synthesis reaction and the MNPs were coated with silica by the Stöber method. Triethox was used as a one-step carboxylation reagent, and 3-aminopropyltriethoxysilane (APTES) an amination reagent, to modify the MNPs. We prepared two types of solid phase antigens using the above synthesized functionalized MNPs coupled with the later prepared AFB1-oxime active ester and the purchased BSA-AFB1 respectively...
October 21, 2016: Luminescence: the Journal of Biological and Chemical Luminescence
Orsolya Benedek, Andreas Podbielski, Philipp Warnke
BACKGROUND: Chemiluminescent or enzyme-linked fluorescent immunoassays are commonly used to diagnose Clostridium difficile-associated diarrhea. METHODS: The LIAISON analyzer (DiaSorin, Italy) was compared to miniVIDAS (bioMérieux, France) and, furthermore, to culture of toxigenic strains. In total, 249 native stool samples were analyzed. Sensitivities, specificities, and positive and negative predictive values were investigated. Furthermore, performance under routine conditions was assessed...
September 29, 2016: European Journal of Microbiology & Immunology
Dominique Endres, Rick Dersch, Oliver Stich, Armin Buchwald, Evgeniy Perlov, Bernd Feige, Simon Maier, Andreas Riedel, Ludger Tebartz van Elst
INTRODUCTION: Vitamin D has many immunomodulatory, anti-inflammatory, and neuroprotective functions, and previous studies have demonstrated an association between vitamin D deficiency and neuropsychiatric disease. The aim of our study was to analyze the prevalence of vitamin D deficiency in a 1-year cohort of adult inpatients with schizophreniform and autism spectrum syndromes in a naturalistic inpatient setting in Germany. PARTICIPANTS AND METHODS: Our study was comprised of 60 adult schizophreniform and 23 adult high-functioning autism spectrum patients who were hospitalized between January and December of 2015...
2016: Frontiers in Psychiatry
Ikram Bezrati, Raouf Hammami, Mohamed Kacem Ben Fradj, Domenico Martone, Johnny Padulo, Moncef Feki, Anis Chaouachi, Naziha Kaabachi
Vitamin D is thought to regulate skeletal muscle function and boost physical performance. The aim of this study was to assess the relationship between vitamin D and physical performance in physically active children. This cross-sectional study included 125 children who practice football as a leisure activity. Plasma 25-hydroxyvitamin D (25-OHD) was assessed using a chemiluminescence immunoassay method. Vitamin D inadequacy was defined as 25-OHD < 20 ng/mL. Physical performance testing included measurements of muscle strength (maximal isometric contraction), jumping ability (vertical jump, standing broad jump, triple hop test), linear sprint (10 m and 20 m), and agility (9 × 4-m shuttle run)...
July 13, 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
I O Oliveira, L P Silva, M C Borges, O M Cruz, J W Tessmann, J V S Motta, F K Seixas, B L Horta, D P Gigante
BACKGROUND/OBJECTIVES: Homocysteine (Hcy) is a key intermediate in methionine metabolism. A high plasma concentration of Hcy is an independent risk factor for cardiovascular diseases among other determinants. In this study, we aimed to investigate the interactions between methylenetetrahydrofolate reductase enzyme gene (MTHFR) polymorphisms and lifestyle variables (smoking, alcohol intake and physical activity) on Hcy concentrations in a young Brazilian population. SUBJECTS/METHODS: The study population comprised 3803 individuals from the Pelotas Birth Cohort, aged 22-23 years...
October 19, 2016: European Journal of Clinical Nutrition
Xiao-Fan Zhang, Wei Zou, Yuan Yang
Depression is an important post-stroke sequela with negative impact on mortality, functional outcome and quality of life. Changes in cytokines have been hypothesized to be associated with the etiology of post-stroke depression (PSD). The altere dhypothalamic-pituitary-adrenal (HPA) functioning is associated with the onset of depression. The activity of HPA could induce the fluctuations of cortisol levels. In this study, we prospectively checked interleukin 6 (IL-6) and cortisol levels in patients with early ischemic stroke...
October 2016: Journal of Huazhong University of Science and Technology. Medical Sciences
Yejoo Jeon, Eun Sun Jang, Yun Suk Choi, Jin-Wook Kim, Sook-Hyang Jeong
BACKGROUND/AIMS: Glypican-3 (GPC3) protein is highly expressed in hepatocellular carcinoma (HCC) tissue. It has been suggested as a diagnostic biomarker, but its inconsistent performance means that it requires further assessment. We therefore investigated the diagnostic value of the plasma GPC3 level compared to the alpha-fetoprotein (AFP) level as a diagnostic biomarker of HCC. METHODS: We enrolled 157 consecutive patients with newly diagnosed HCC and 156 patients with liver cirrhosis (LC) as the control group...
September 2016: Clinical and Molecular Hepatology
Natascia Tahani, Gilda Ruga, Simona Granato, Matteo Spaziani, Francesca Panimolle, Antonella Anzuini, Andrea Lenzi, Antonio Francesco Radicioni
Klinefelter syndrome has been associated with thyroid abnormalities, the genesis of which is not yet fully clear. The aim of this study was to evaluate thyroid function in Klinefelter syndrome subjects during the pubertal period. Chemiluminescent microparticle immunoassay was used to analyze Thyroid-Stimulating Hormone, fT3 and fT4 concentration in serum samples from 40 Klinefelter syndrome pubertal boys with classic 47,XXY karyotype and 157 healthy age-matched controls. 13 Klinefelter syndrome patients also underwent Thyrotropin-Releasing Hormone testing to evaluate hypothalamic-pituitary function...
October 11, 2016: Endocrine
Wen-Xing Li, Wei Li, Jia-Qian Cao, Haiyue Yan, Yuanyuan Sun, Hong Zhang, Qiang Zhang, Ling Tang, Manman Wang, Jing-Fei Huang, Dahai Liu
Alanine aminotransferase (ALT), aspartate transaminase (AST), and glutamyl transpeptidase (GGT) were three key enzymes in the hepatic metabolism. This study aimed to investigate the effect of homocysteine (Hcy) metabolism gene polymorphisms and serum Hcy and folate level on the hepatic functions in a Chinese hypertensive population. A representative sample with 480 subjects aged 28-75 was enrolled in 2005.9-2005.12 from six hospitals in different Chinese regions. Serum ALT, AST and GGT were measured by using an automatic biochemistry analyzer...
2016: Journal of Nutritional Science and Vitaminology
Celine A Mandon, Loïc Jacques Blum, Christophe Andre Marquette
3D printing technologies will impact in a near future the biosensor community, both at the sensor prototyping level and the sensing layer or-ganization level. The present study aimed at demonstrating the capacity of one 3D printing technique, the Digital Light Processing (DLP), to produce hydrogel sensing layers with 3D shapes unreachable using conventional molding procedures. The first model of sensing layer was com-posed of a sequential enzymatic reaction (glucose oxidase and peroxidase) which generated chemiluminescent signal in the presence of glucose and luminol...
October 11, 2016: Analytical Chemistry
Riaz Abdulla, Rouchelle Charmaine Tellis, Roshan Athikari, Jagadish Kudkuli
CONTEXT: Nonsyndromic cleft lip with or without palate (NSCL ± P) is a genetic predisposition involving defects in shape and makeup of the lip and palate. Elevation of homocysteine (Hcy) levels is seen in medical complications such as developmental anomalies causing neural tube defects, congenital vascular diseases, neurodegenerative and psychiatric conditions. Evaluation of serum Hcy levels forms an important feature to look further into molecular aspects. AIMS: The aim of this study was to evaluate the Hcy levels in NSCL ± P cases by comparing with control cases having no orofacial deformities...
September 2016: Journal of Oral and Maxillofacial Pathology: JOMFP
Damien Denimal, Marie-Claude Brindisi, Stéphanie Lemaire, Laurence Duvillard
BACKGROUND: Recent studies revealed that obesity is associated with decreased serum but at the same time increased red blood cell (RBC) folate concentrations compared with lean subjects, thus casting doubt upon the agreement between serum and RBC folate measurements for assessing folate status. This work aimed to determine whether these two metrics lead to the same classification of folate status in obese patients. METHODS: RBC and serum folate concentrations were measured with a chemiluminescent immunoassay in 263 adults with body mass index ≥30 kg/m(2) and without previous bariatric surgery...
October 8, 2016: Obesity Surgery
Z P Wang, M Zhao, Q S Qu, S Z Miao
We investigated the effect of pregnane X receptor (PXR) polymorphisms on tacrolimus (FK506) blood trough concentrations and the associated adverse reactions in kidney transplantation recipients (KTRs). Polymerase chain reaction (PCR)-restriction fragment length polymorphism was used to detect the genotypes of single nucleotide polymorphism loci in 336 KTRs. The PXR six-base deletion mutation was classified using specific allele PCR, and the FK506 blood trough concentration in the KTRs was measured by chemiluminescent microparticle immunoassay...
September 16, 2016: Genetics and Molecular Research: GMR
Moo Hyun Lee, So-Youn Jung, Sun Hee Kang, Eun Jin Song, In Hae Park, Sun-Young Kong, Young Mee Kwon, Keun Seok Lee, Han-Sung Kang, Eun Sook Lee
PURPOSE: This study evaluated the association of serum HER2 (sHER2) levels at diagnosis with clinicopathologic parameters and disease free survival (DFS) in operable breast cancer patients according to intrinsic subtype. METHODS: The sHER2 levels were measured using a chemiluminescence immunoassay. The HER2 status in all tumor tissues was determined by immunohistochemistry, and confirmed in equivocal cases by fluorescence in situ. RESULTS: There were 436 consecutive stage I-III breast cancer patients with sHER2 result at diagnosis between Nov 2004 and Dec 2011...
2016: PloS One
Nuno Mendonça, John C Mathers, Ashley J Adamson, Carmen Martin-Ruiz, Chris J Seal, Carol Jagger, Tom R Hill
Very old adults are at increased risk of folate and vitamin B12 deficiencies due to reduced food intake and gastrointestinal absorption. The main aim was to determine the association between folate and vitamin B12 intake from total diets and food groups, and status. Folate or vitamin B12 intakes (2 × 24 h multiple pass recalls) and red blood cell (RBC) folate or plasma vitamin B12 (chemiluminescence immunoassays) concentrations were available at baseline for 731 participants aged 85 from the Newcastle 85+ Study (North-East England)...
2016: Nutrients
Nighat Y Sofi, Monika Jain, Umesh Kapil, Vuthaluru Seenu, Vineet Kumar Kamal, Ravinder Mohan Pandey
To study the nutritional risk factors and status of serum 25(OH)D levels in patients with breast cancer. A total of 100 women (cases) with confirmed breast cancer (BC) matched with equal number of healthy females (controls) of similar age and socioeconomic status (SES) were included in study. Controls included were nonbreast cancer patients who accompanied the patients to a tertiary care hospital. All the subjects (cases and controls) were administered a questionnaires to collect data on socioeconomic status, dietary pattern and the frequency of food consumption using a validated food frequency questionnaire...
September 26, 2016: Journal of Steroid Biochemistry and Molecular Biology
Nico Lelie, Roberta Bruhn, Michael Busch, Marion Vermeulen, Wai-Chiu Tsoi, Steven Kleinman
BACKGROUND: Twenty-two users of individual donation nucleic acid amplification technology (ID-NAT) in six geographical regions provided detailed hepatitis B virus (HBV) infection data in first-time, lapsed, and repeat donations and classified confirmed HBV-positive donors into different infection categories. These data were used to compare the clinical sensitivity of hepatitis B surface antigen (HBsAg) and HBV-DNA testing. STUDY DESIGN AND METHODS: In total 10,981,776 donations from South Africa, Egypt, the Mediterranean, North and Central Europe, South East Asia, and Oceania were screened for HBV-DNA using the Ultrio assay (Grifols/Hologic) and for HBsAg using a chemiluminescence immunoassay, and 9455 HBV-infected donations were identified...
September 27, 2016: Transfusion
Pelle G Lindqvist, Aldo T Silva, Sven A Gustafsson, Sebastian Gidlöf
OBJECTIVE: Vitamin D deficiency causes not only skeletal problems but also muscle weakness, including heart muscle. If the fetal heart is also affected, it might be more susceptible to fetal distress and birth asphyxia. In this pilot study, we hypothesised that low maternal vitamin D levels are over-represented in pregnancies with fetal distress/birth asphyxia. DESIGN AND SETTING: A population-based nested case-control study. PATIENTS: Banked sera of 2496 women from the 12th week of pregnancy...
September 22, 2016: BMJ Open
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