scholarly journals A Simple Graphene Functionalized Electrochemical Aptasensor for the Sensitive and Selective Detection of Glycated Albumin

2021 ◽  
Vol 11 (21) ◽  
pp. 10315
Author(s):  
Nang Noon Shean Aye ◽  
Pornsuda Maraming ◽  
Ratree Tavichakorntrakool ◽  
Attawut Chaibunruang ◽  
Patcharee Boonsiri ◽  
...  
Keyword(s):  
Glycated Albumin ◽  
Diabetic Patients ◽  
Label Free ◽  
Serum Samples ◽  
Covalent Interaction ◽  
Promising Tool ◽  
Before And After ◽  
Carboxylic Groups ◽  
Free Graphene ◽  
Specific Proteins

Glycated albumin (GA) has been previously introduced as a promising biomarker for glycemic monitoring in diabetes patients with thalassemia. In this study, a label-free graphene oxide (GO)-modified aptasensor was developed for the rapid detection of GA. The fabrication of the aptasensor was dependent on the covalent interaction of the amine-functionalized GA-specific aptamer with the carboxylic groups of GO. Square wave voltammetry (SWV) analysis was carried out for the measurement of GA-aptamer binding to their specific proteins. The peak current changes before and after incubation with GA protein were directly proportional to the concentration. The developed aptasensor exhibited a broad linearity (1–10,000 µg mL−1), a low detection limit (LOD) of 0.031 µg mL−1, and high selectivity for GA detection. In addition, the aptasensor was successfully applied to detect GA in both spiked and clinical serum samples. The comparison of the developed method with a commercial assay validated the reliability of the aptasensor for clinical application. Therefore, the newly developed aptasensor is a promising tool for GA measurements in diabetic patients with underlying thalassemia.

scholarly journals Changes in the albumin glycation site, plasma pentosidine and esRAGE concentrations before and after intensive diabetic treatment in patients with abnormally high glycated albumin levels

2017 ◽  
Vol 55 (1) ◽  
pp. 84-91 ◽  
Author(s):  
Hiroyasu Miyamoto ◽  
Takuji Kohzuma ◽  
Akihiro Ohnishi
Keyword(s):  
Liver Cirrhosis ◽  
Fatty Liver ◽  
Glycated Albumin ◽  
Reference Interval ◽  
Diabetic Patients ◽  
Glycated Proteins ◽  
Before And After ◽  
Diabetic Treatment ◽  
The Relationship ◽  
Hba1c Levels

Background We have reported that the blood glucose normalization treatment reduced the albumin glycation sites and the intensity of albumin AGE fluorescence in patients with abnormally high glycated albumin levels. To clarify the relationship between glycaemic control status and levels of glycated proteins and related markers, we studied the change of the markers of the DM patients with and without fatty liver, liver cirrhosis and dialysis before and after the intensive diabetic treatment. Methods Eight diabetic patients with abnormally high glycated albumin levels (no complications: 2, fatty liver: 3, liver cirrhosis: 2, dialysis: 1) were recruited. In the hypoglycaemic treatment for these patients, the HbA1c, glycated albumin, albumin AGE fluorescence, pentosidine, endogenous secretory receptors for AGE (esRAGE) and glycation sites of albumin were determined. Results Glycated albumin and HbA1c levels dropped after the treatment. Albumin glycation sites decreased in almost the same pattern, irrespective of the type of complications. The fluorescence intensity and pentosidine concentrations decreased significantly. However, post-treatment pentosidine concentrations were higher than the reference interval in all cases. Average esRAGE concentrations did not change and were lower than the reference interval. Conclusions Hypoglycaemic treatment reduced the glycated albumin levels, glycation sites of albumin and AGE concentrations but not esRAGE concentrations in diabetic patients with or without fatty liver, liver cirrhosis, and dialysis. Checking and maintaining low glycated albumin levels would prevent the formation of AGE and may be useful to prevent the onset or progression of diabetes complications.

scholarly journals The Use of Different Irrigation Techniques to Decrease Bacterial Loads in Healthy and Diabetic Patients with Asymptomatic Apical Periodontitis

2016 ◽  
Vol 4 (4) ◽  
pp. 714-719 ◽  
Author(s):  
Mai Ghoneim ◽  
Shehab ElDin Saber ◽  
Tarek El-Badry ◽  
Maram Obeid ◽  
Nehal Hassib
Keyword(s):  
Irrigation System ◽  
Apical Periodontitis ◽  
Diabetic Patients ◽  
Bacterial Reduction ◽  
Multisystem Disease ◽  
Root Canals ◽  
Promising Tool ◽  
Before And After ◽  
Root Canal System ◽  
Reducing Bacteria

BACKGROUND: Diabetes mellitus is a multisystem disease which weakens the human’s immunity. Subsequently, it worsens the sequelae of apical periodontitis by raising a fierce bacterial trait due to the impaired host response.AIM: The study aimed to estimate bacterial reduction after using different irrigation techniques in systemically healthy and diabetic patients with asymptomatic apical periodontitis.MATERIAL AND METHODS: Enterococcus faecalis, Peptostreptococcus micros, and Fusobacterium necleatum bacteria were chosen, as they are the most common and prevailing strains found in periodontitis. Bacterial samples were retrieved from necrotic root canals of systemically healthy and diabetic patients, before and after endodontic cleaning and shaping by using two different irrigation techniques; the conventional one and the EndoVac system. Quantitive polymerase chain reaction (qPCR) was utilised to detect the reduction in the bacterial count.RESULTS: The EndoVac irrigation system was effective in reducing bacteria, especially Peptostreptococcus micros in the diabetic group when compared to conventional irrigation technique with a statistically significant difference.CONCLUSION: The EndoVac can be considered as a promising tool in combination with irrigant solution to defeat the bacterial colonies living in the root canal system. Additional studies ought to be done to improve the means of bacterial clearance mainly in immune-compromised individuals.

scholarly journals A simple label-free electrochemical sensor for sensitive detection of alpha-fetoprotein based on specific aptamer immobilized platinum nanoparticles/carboxylated-graphene oxide

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jantima Upan ◽  
Napaporn Youngvises ◽  
Adisorn Tuantranont ◽  
Chanpen Karuwan ◽  
Philippe Banet ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Platinum Nanoparticles ◽  
Alpha Fetoprotein ◽  
Label Free ◽  
Carbon Paste ◽  
Serum Samples ◽  
Redox Probe ◽  
Recognition Element ◽  
Before And After ◽  
Sensitive Determination

AbstractA label-free electrochemical aptamer-based sensor has been fabricated for alpha-fetoprotein (AFP) detection. Platinum nanoparticles on carboxylated-graphene oxide (PtNPs/GO-COOH) modified screen-printed graphene-carbon paste electrode (SPGE) was utilized as an immobilization platform, and the AFP aptamer was employed as a bio-recognition element. The synthesized GO-COOH helps to increase the surface area and amounts of the immobilized aptamer. Subsequently, PtNPs are decorated on GO-COOH to enhance electrical conductivity and an oxidation current of the hydroquinone electrochemical probe. The aptamer selectively interacts with AFP, causing a decrease in the peak current of the hydroquinone because the binding biomolecules on the electrode surface hinder the electron transfer of the redox probe. Effects of aptamer concentration and AFP incubation time were studied, and the current changes of the redox probe before and after AFP binding were investigated by square wave voltammetry. The developed aptasensor provides a linear range from 3.0–30 ng mL−1 with a detection limit of 1.22 ng mL−1. Moreover, the aptamer immobilized electrode offers high selectivity to AFP molecules, good stability, and sensitive determination of AFP in human serum samples with high recoveries.

Study the Relationship Between Estrogen Hormone and Calcium in Normal Females Before and After Menopause in Baghdad / Iraq

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Sameerah Mustafa ◽  
Asal Tawfeeq ◽  
Hadeel Hasan
Keyword(s):  
Oral Contraceptive ◽  
Healthy Controls ◽  
Serum Samples ◽  
Oral Contraceptive Pills ◽  
Contraceptive Pills ◽  
Menopausal Women ◽  
Before And After ◽  
Group A ◽  
Group B ◽  
Age Range

This study involved the collection of (90) samples of women serum which included (30) serum samples collected from women before menopause (reproductive women) in the age range of (22-43) years and were considered as (group A- control). While, (group B) included (30) serum samples collected from women using oral contraceptive pills between the ages of (22-43) years old. Whereas, another (30) serum samples were collected from women after menopause between the ages of (43-54) years and were considered as (group C). All of the collected serum samples were subjected to a number of serological and chemical tests for the measurement of (E2, HDL, LDL and Ca). Then, the obtained data were statistical analyzed and results showed a significant decrease (p˂ 0.05) in (E2 ,Ca and HDL) levels in menopausal women compared to that of the normal healthy controls. While, there were non-significant decrease (p> 0.05) in (E2, Ca and HDL) levels in women taking oral contraceptive when compared to the normal healthy controls. On the other hand, a significant increase (p˂ 0.05) was recorded in LDL level in menopausal women compared to that of the normal healthy controls whereas, no-significant increase (p˃ 0.05) in the LDL level in women taking oral contraceptives when compared to the control women.

Reduction of Milk Contamination with Aflatoxin-M1 through Vaccination of Dairy Cattle with Aflatoxin-B1 Vaccine

2020 ◽  
Keyword(s):  
Dairy Cattle ◽  
Aflatoxin B1 ◽  
Booster Vaccination ◽  
Primary Vaccination ◽  
Nano Particles ◽  
Aflatoxin M1 ◽  
Serum Samples ◽  
Serum Albumins ◽  
Milk Contamination ◽  
Before And After

Aflatoxin M1 is one of mycotoxin derivatives, which is secreted in milk of dairy cattle fed on feed contaminated with Aflatoxin-B1 (AFB1). The current study was designed to prepare a vaccine against AFB1and to evaluate its efficacy in reducing or preventing secretion of AFM1 in milk. Aflatoxin-B1 was prepared, purified and transformed into oxime, then it was fixed on bovine serum albumins. The AFB1-BSA conjugate was adjuvanted with Gold Nano particles then Montanide ISA 206. The prepared vaccine was used for immunization of rabbits by S/c routes as 100 µg/dose and dairy cattle by I/M routes as 500 µg/dose. The vaccinated animals were boosted at 3 weeks post primary immunization. Serum samples were collected and examined for the anti-AFB1 using AGPT. A mean titer of 15.2 AGPU/ml was detected at 2 weeks post primary vaccination then significantly increased till reached to 76.8 AGPU/ml at 6 weeks post Booster vaccination. All vaccinated rabbits were challenged with dose of 0.3 mg AFB1 toxin/Kg. The vaccinated rabbit showed 100% protection and no AFB1 toxin residue was detected in their livers. Milk samples were collected from non-vaccinated and AFB1-immunized dairy cattle then examined with ELISA for quantitation of AFM1 residues before and after vaccination. The results showed that the prepared AFB1 vaccine was safe, potent and able to reduce AFM1 release in milk of vaccinated heifers by 70%. So the vaccination of lactating animals with the AFB1vaccine might represent a valid tool for the prevention of AFM1 contamination of milk and dairy products.

scholarly journals A preliminary study on diabetes self-management education and glycemic control among patients with diabetes mellitus

2019 ◽  
Vol 9 (9) ◽  
pp. 98 ◽  
Author(s):  
Kisokanth G. ◽  
Indrakumar J. ◽  
Prathapan S. ◽  
Joseph J. ◽  
Ilankoon I.M.P.S.
Keyword(s):  
Diabetes Mellitus ◽  
Glycemic Control ◽  
Management Education ◽  
Self Management ◽  
Rank Test ◽  
Diabetic Patients ◽  
Effective Measure ◽  
Before And After ◽  
Patients With Diabetes ◽  
Preliminary Study

This study was aimed to assess the effectiveness of diabetes self-management education (DSME) in the improvement of glycemic control among patients with type 2 Diabetes Mellitus (T2DM) in Batticaloa District, Sri Lanka. The study was a prospective interventional study and conducted as a preliminary study at medical clinic, Base hospital, Kaluwanchikudy, Batticaloa. Thirty patients with T2DM were included based on inclusion and exclusion criteria. A structured individual diabetes self-management education for 10 hours (one hour per week) was delivered to diabetic patients by the trained Nurse Health Educator. Glycosylate hemoglobin (HbA1c) was assessed as a main outcome measure and Fasting Blood Sugar (FBS), Body Mass Index (BMI) of each patient were also measured and recorded before and after the intervention. The respondent rate was 96.7% (n = 29). Majority of them were females (n = 25, 86.2%). A Wilcoxon signed rank test showed that DSME had a statistically significant reduction in HbA1c [8.60 (IQR 2.60) vs. 7.40 (IQR 2.10), p = .000] and FBS level [159.00 (IQR 77.50) vs. 134.00 (IQR 40.50), p = .002] at 3 months of intervention. The mean BMI at baseline was higher compared to 3 months of intervention [24.88 (SD ± 3.06) vs. 24.19 (SD ± 2.79)] which was statistically significant (p = .000). Majority of participants (n = 22, 75.9%) had improved their HbA1c level by ≥ 0.5% in 3 months. The diabetes self-management education is an effective measure in improving glycemic control and other clinical parameters among patients with T2DM. Thus, DSME needs to be implemented among clinic patients with T2DM for the better outcome and the preventions of complications.

scholarly journals Ultrasensitive and label free electrochemical immunosensor for detection of ROR1 as an oncofetal biomarker using gold nanoparticles assisted LDH/rGO nanocomposite

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Rozita Abolhasan ◽  
Balal Khalilzadeh ◽  
Hadi Yousefi ◽  
Sahar Samemaleki ◽  
Forough Chakari-Khiavi ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Flexible Structures ◽  
Modified Electrodes ◽  
Electrochemical Immunosensor ◽  
Lymphocytic Leukemia ◽  
Orphan Receptor ◽  
Detection Sensitivity ◽  
Label Free ◽  
Serum Samples ◽  
Limit Of Quantification

AbstractIn the present article, we developed a highly sensitive label-free electrochemical immunosensor based on NiFe-layered double hydroxides (LDH)/reduced graphene oxide (rGO)/gold nanoparticles modified glassy carbon electrode for the determination of receptor tyrosine kinase-like orphan receptor (ROR)-1. In this electrochemical immunoassay platform, NiFe-LDH/rGO was used due to great electron mobility, high specific surface area and flexible structures, while Au nanoparticles were prepared and coated on the modified electrodes to improve the detection sensitivity and ROR1 antibody immobilizing (ROR1Ab). The modification procedure was approved by using cyclic voltammetry and differential pulse voltammetry based on the response of peak current to the step by step modifications. Under optimum conditions, the experimental results showed that the immunosensor revealed a sensitive response to ROR1 in the range of 0.01–1 pg mL−1, and with a lower limit of quantification of 10 attogram/mL (10 ag mL−1). Furthermore, the designed immunosensor was applied for the analysis of ROR1 in several serum samples of chronic lymphocytic leukemia suffering patients with acceptable results, and it also exhibited good selectivity, reproducibility and stability.

scholarly journals AB0042 CYTOKINE NETWORK ELUCIDATED BY THE QUANTIFICATION OF MULTIPLE CYTOKINES IN THE SERUM SEQUENTIALLY SAMPLED FROM RA PATIENTS WHO WERE TREATED WITH BIOLOGIC DMARDS

2020 ◽  
Vol 79 (Suppl 1) ◽  
pp. 1323.2-1324
Author(s):  
K. Sato ◽  
S. Mamada ◽  
C. Hayashi ◽  
T. Nagashima ◽  
S. Minota
Keyword(s):  
Bone Erosion ◽  
Feedback System ◽  
Serum Levels ◽  
Type I Interferons ◽  
Type I ◽  
Serum Samples ◽  
Cytokine Network ◽  
Biologic Dmards ◽  
Type I Ifns ◽  
Before And After

Background:Biologic disease modifying anti-rheumatic drugs (DMARDs) have demonstrated that proinflammatory cytokines such as interleukin (IL-) 6 and tumor necrosis factor (TNF) play important roles in the pathogenesis of rheumatoid arthritis (RA). Other cytokines, such as type I interferons (IFNs), are also implicated in its pathogenesis (ref 1). However, the complete picture of the cytokine network involved in RA remains to be elucidated.Objectives:By quantifying sets of cytokines in the serum of RA patients before and after treatment with various biologic DMARDs, we sought to determine the effects of drugs on (A) type I IFNs, (B) soluble IL-6 receptors, and (C) other cytokines.Methods:52 patients with RA were treated with various biologic DMARDs (tocilizumab (TOC): 16, abatacept (ABT): 15, and TNF inhibitors (TNFi): 21). Serum samples were obtained (1) before, (2) approximately 4 weeks after (3) and approximately 12 weeks after the initiation of treatment. A suspension bead-array system was used for analysis; Bio-Plex Human Cytokine 17-plex Assay kits and Express Custom Panels (Bio-Rad), including IFN-β, IFN-α2, soluble IL-6 receptor α (sIL6Rα) and gp130 were used.Results:(1) As expected, the disease activity score 28-joiny count (DAS28) using the erythrocyte sedimentation rate (ESR) significantly decreased in all three groups (TOC, ABT and TNFi) by 12 weeks.(2) IFN-α2 was barely detected in the serum samples. IFN-β seemed to increase slightly in the ABT group, but the increase was not statistically significant.(3) The levels of sIL6Rα did not change substantially. Those of gp130 decreased slightly but significantly in the TOC group by 12 weeks.(4) The levels of IL-6 decreased significantly in the ABT group by 12 weeks. Those in the TNFi group decreased significantly at 4 weeks but not 12 weeks (Fig. 1A).(5) The levels of IL-7 decreased significantly only in the TOC group (Fig. 1B).Conclusion:(1) The biologic DMARDs tested in this study did not significantly affect the serum levels of type I IFNs in this study.(2) The decrease in gp130 in the TOC group may imply that gp130 is induced by IL-6, although whether this level of decrease has physiological significance is open to question.(3) Serum IL-6 was significantly decreased in the TNFi group at 4 weeks but not 12 weeks. TNF has been reported to induce IL-6 (ref 2), but negative feedback loop(s) may be present. Such a feedback system might make the discontinuation of TNFi difficult, even if patients are in remission.(4) IL-7 may be a target of IL-6. A higher level of IL-7 has been reported to be present in the joints of RA patients compared with osteoarthrosis and it is a cytokine implicated in the differentiation of osteoclasts (ref 3). This may partly explain the effect of TOC on preventing bone erosion in RA.References:[1]Ann Rheum Dis. 2007; 66: 1008–14[2]Rheumatology 2007; 46: 920-6[3]Rheumatology 2008; 47: 753-9Acknowledgments:We thank all the members of the Division of Rheumatology and Clinical Immunology, Department of Medicine, Jichi Medical University. We are also grateful to the patients involved in this study.Disclosure of Interests:Kojiro Sato Grant/research support from: Abbie, Pfizer, Chugai, Astellas, Mitsubishi-Tanabe, Ono, Takeda, Sachiko Mamada: None declared, Chiyomi Hayashi: None declared, Takao Nagashima: None declared, Seiji Minota: None declared

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