58 research outputs found
Biomonitoring of common organophosphate metabolites in hair and urine of children from an agricultural community
Levels of dialkylphosphate (DAP) metabolites were measured in hair and urine of children that lived close to
intensively farmed areas of Almeria (Southeast Spain). The levels were used as proxies for exposure of these
children to organophosphate pesticides (OPs). Determinants of exposure to DAPs were also examined. Urine and
hair samples were collected from 222 children aged 3–11 years and information on lifestyle and dietary habits
was collected from questionnaires administered to mothers. Urinary DAPs were analyzed by ultra-high performance
liquid-chromatography coupled to triple-quadrupole tandem mass-spectrometry (UHPLC-QqQ-MS/MS)
and hair DAPs by gas-chromatography coupled to mass spectrometry (GC–MS). Detection rates ranged from
21.8% for diethylphosphate (DEP) and diethylthiophosphate (DETP) to 35.9% for dimethylphosphate (DMP) in
urine; and from 42.3% for DETP to 92.8% for DMP in hair. Diethyldithiophosphate (DEDTP) was detected in
0.5% of urine samples (one child), and in 26.6% of children's hair samples. A lack of correlation was observed for
individual DAP metabolites and ΣDAPs between urine and hair samples, except for DEDTP. Urinary DAP levels of
our child population were lower than those reported for children from other countries, including NHANES
1999–2000 data.This study was partially funded by the Ministry of Economy,
Innovation, Science and Employment, Government of Andalucia (reference
number P08-CTS-04313, FEDER funds)
Instruments to assess secondhand smoke exposure in large cohorts of never smokers: The smoke scales
© 2014 The Authors. Published by PLOS. This is an open access article available under a Creative Commons licence.
The published version can be accessed at the following link on the publisher’s website: https://doi.org/10.1371/journal.pone.0085809The objectives of this study were to: (i) to develop questionnaires that can identify never-smoking children and adults experiencing increased exposure to secondhand smoke (SHS+), (ii) to determine their validity against hair nicotine, and (iii) assess their reliability. A sample of 191 children (85 males; 106 females; 7-18 years) and 95 adult (23 males; 72 females; 18- 62 years) never-smokers consented to hair nicotine analysis and answered a large number of questions assessing all sources of SHS. A randomly-selected 30% answered the questions again after 20-30 days. Prevalence of SHS+ in children and adults was 0.52±0.07 and 0.67±0.10, respectively (p16.5 and >16, respectively. Significant Kappa agreement (p0.05). Area under the curve and McNemar's Chi-square showed no pair-wise differences in sensitivity and specificity at the cutoff point between the two different days for SS-C and SS-A (p>0.05). We conclude that the SS-C and the SS-A represent valid, reliable, practical, and inexpensive instruments to identify children and adult never-smokers exposed to increased SHS. Future research should aim to further increase the validity of the two questionnaires. © 2014 Misailidi et al.Published versio
Airway epithelial cell exposure to distinct e-cigarette liquid flavorings reveals toxicity thresholds and activation of CFTR by the chocolate flavoring 2,5-dimethypyrazine
Development of mass spectrometry analytical methods for the determination of pyrethroid and neonicotinoid pesticides in laboratory animal biological samples. Implementation of them for the biomonitoring of rural and special population groups
Aim of this study was to develop and validate new analytical methods for thedetection and quantification of parent and metabolite compounds of cypermethrinand imidacloprid pesticides in various biological samples. Also their toxicity wasinvestigated in-vivo. Pyrethroids and neonicotinoids are two classes of pesticideswidely and extensively used the last decades. The interest concerning thesesubstances is growing, since they are used as replacement for the organophosphorusand carbamates pesticides. Of a great concern is also the biomonitoring ofpopulation to these chemicals, especially for occupationally exposed individuals whoare exposed longer and in higher levels. Cretan population consists of a mixture ofrural and urban residents, while many individuals dealing with agricultural activitiesas amateurs. Furthermore, the residence of cretan population is offen nearagricultural facilities such as open fields and green houses. This results multiple riskand burden to the aforementioned pesticides. In literature even increasing reports ofacute or chronic toxicity cases of these substances can be found. The escalatingconcerns of the international scientific community on the effects of these substanceson populations, gave rise to this study.Cypermethrin is a synthetic pyrethroid pesticide used for both domestic andagricultural applications. Its chemical structure is relative to the natural pyrethrin. Itis supposed to be relatively low toxic for human and other mammals, while acts asneurotoxin when contact with insects. The specific metabolites for cypermethrin arecis- and irons-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane-1-carboxylic acids (cisandtrans-Cl2CA) and the non-specific metabolite 3-phenoxybenzoic acid (3-PBA),which is common for at least ten different pyrethroids. Neonicotinoids are also agroup of synthetic pesticides with insecticidal act that found a lot of applicationmainly in agriculture, the last three decades. Imidacloprid is one of the mostcommon neonicotinoid, which is metabolized to the non-specific 6-chloronicotinicacid (6-ClNA). Although limited references can be found concerning neonicotinoids,it is proven that the toxicity of these pesticides must be examined. In-vivo experiments were executed on rabbits. Laboratory animals of samegender and age were used and were exposed orally with sub-acute dosages of theaforementioned pesticides. The administrated levels were calculated in order torepresent the 1/15 and 1/30 of the LD50 (lethal dose) when it was possible. Durationof the experiment was about 6 months. During experiment, samplings of biologicalsamples (urine, hair, blood) were executed (before beginning the administration andafter completing two months).Analytical methods for the detection of the parent compound and themetabolites were developed, using techniques of chromatography and massspectrometry. The developed methods were validated by calculating severalanalytical parameters (linearity, recovery, precision, accuracy, limits of detection-LOD, limits of quantification-LOQ). Furthermore, the results were compared withcontamination parameters (administrative dosage, duration of exposure).Briefly, for the detection of imidacloprid and its metabolite 6-ClNA, ananalytical method using liquid chromatography-mass spectrometry was developed.Limit of detection for imidacloprid was 0.02 ng/mg and 0.01 ng/mg for 6-ClNA in hairsamples, while in urine samples the corresponding values were 0.002 μg/ml forimidacloprid and 0.008 μg/ml for 6-ClNA. Satisfactory chromatographic separationwas achieved with retention time for imidacloprid 11.13 min and 12.46 min for 6-ClNA. Linearity of both standard solutions and spiked samples was more thansatisfactory for both hair and urine developed methods (>0.99). Mean recovery forimidacloprid was calculated to be 97.13% (n=9) and 91.42% (n=9) for 6-ClNA in hairsamples, while in urine samples the corresponding values were 96.11% (n=9) and103.44% (n=9). The method accuracy was >98.71% for imidacloprid and >100.25%for 6-ClNA in hair samples method and >98.93% for imidacloprid and >97.82% for 6-ClNA in urine samples method. The corresponding precision values were fluctuated0.99). Meanrecovery for cis-Cl2CA was 84.8% (n=8), for trans-Cl2CA 87.2% (n=8) and for 3-PBAwas 96.4% (n=8) for hair samples, while for urine samples the correspondingrecoveries were 102.1% (n=3), 111.2% (n=3) and 87.1% (n=3). Accuracy wasestimated to be >91.8% for cis-Cl2CA, >96.7% for trans-Cl2CA and >90.5% for 3-PBAfor hair samples method and >89.2% for cis-Cl2CA, >71.6% for trans-Cl2CA and>86.0% for 3-PBA for urine samples method. The corresponding precision valueswere fluctuated 0.99).Η μέση ανάκτηση για το imidacloprid ήταν 97.13% (n=9) και 91.42% (n=9) για το 6-ClNA για τα δείγματα τριχών, ενώ για τα δείγματα των ούρων οι αντίστοιχες ανακτήσεις ήταν 96.11% (n=9) και 103.44% (n=9). Η ακρίβεια της μεθόδου(accuracy) ήταν >98.71% για το imidacloprid και >100.25% για το 6-ClNA για τοπρωτόκολλο της τρίχας και >98.93% για το imidacloprid και >97.82% για το 6-ClNAγια το πρωτόκολλο των ούρων. Οι αντίστοιχες τιμές της ακρίβειας (precision)κυμαίνονταν 0.99). Η μέση ανάκτηση για το cis-Cl2CA ήταν 84.8% (n=8), για το trans-Cl2CA 87.2% (n=8) και για το 3-PBA ήταν 96.4%(n=8) για τα δείγματα τριχών, ενώ για τα δείγματα των ούρων οι αντίστοιχεςανακτήσεις ήταν 102.1% (n=3), 111.2% (n=3) και 87.1% (n=3). Η ακρίβεια τηςμεθόδου (accuracy) υπολογίστηκε >91.8% για το cis-Cl2CA, >96.7% για το trans-Cl2CAκαι >90.5% για το 3-PBA για το πρωτόκολλο της τρίχας και >89.2% για το cis-Cl2CA,>71.6% για το trans-Cl2CA και >86.0% για το 3-PBA για το πρωτόκολλο των ούρων.Οι αντίστοιχες τιμές της ακρίβειας (precision) κυμαίνονταν <13.6% για όλες τιςπεριπτώσεις.Τα δείγματα τριχών των πειραματόζωων που αναλύθηκαν έδωσανστατιστικά σημαντικές διαφορές ανάμεσα στις ομάδες των ζώων (control, χαμηλήδόση, υψηλή δόση) για το διάστημα 0 έως 4 μήνες έκθεσης για όλους τουςμεταβολίτες, cis-Cl2CA (p=0.009), trans-Cl2CA (p=0.003), 3-PBA (p=0.012). Οισυγκεντρώσεις του cis-Cl2 CA στα δείγματα τριχών για την ομάδα ελέγχου (control)κυμαίνονταν από <LOD έως 112.6 pg/mg, για την ομάδα της χαμηλής δόσης από<LOD έως 1022.0 pg/mg και για την ομάδα της υψηλής δόσης από <LOD έως 5361.4pg/mg. Οι αντίστοιχες συγκεντρώσεις του trans-Cl2CA στα δείγματα τριχών για τηνομάδα ελέγχου (control) κυμαίνονταν από <LOD έως 112.0 pg/mg, για την ομάδατης χαμηλής δόσης από <LOD έως 1367.0 pg/mg και για την ομάδα της υψηλήςδόσης από <LOD έως 5448.2 pg/mg. Τέλος για το 3-PBA οι συγκεντρώσεις σταδείγματα τριχών για την ομάδα ελέγχου (control) κυμαίνονταν από 16.5 έως 42.8pg/mg, για την ομάδα της χαμηλής δόσης από <LOD έως 146.7 pg/mg και για την ομάδα της υψηλής δόσης από <LOD έως 659.9 pg/mg. Τα αποτελέσματα πουπροέκυψαν από την ανάλυση των τριχών των πειραματόζωων έδειξαν αύξηση τωνεπιπέδων όλων των μεταβολιτών με τη πάροδο του χρόνου και η αύξηση αυτή ήτανανάλογη της χορηγούμενης δόσης.Οι συγκεντρώσεις όλων των μεταβολιτών στα δείγματα ούρων για τηνομάδα ελέγχου (control) ήταν <LOD για όλη τη διάρκεια του πειράματος. Για τηνομάδα της χαμηλής δόσης οι συγκεντρώσεις για το cis-Cl2CA από <LOD έως 1365.6ng/ml και για την ο
Neonicotinoide mit 6-Chlorpyridinyl-Gruppe (z. B. Imidacloprid, Acetamiprid, Thiacloprid, Nitenpyram, Boscalid) - Bestimmung von 6-Chlornikotinsäure in Urin mittels GC-MS [Biomonitoring Methods in German language, 2018]
Μελέτη βιωσιμότητας ενεργειακής αξιοποίησης του φράγματος Αποσελέμη
Μη διαθέσιμη περίληψηNot available summarizatio
Biomonitoring of bisphenol A in hair of greek population
Objective: Bisphenol A (BPA) is considered as an endocrine-disruptor in which humans are exposed daily mainly by food-contact products, toys, recycled paper and drinking containers. In this study, we validated a method for the isolation and the detection of BPA in human head hair samples and estimated the burden of BPA in hair of Greek population. Methods: Hair samples were collected from 69 volunteers. The isolation of the BPA was performed by solid-liquid extraction with methanol and its determination by a liquid chromatography-mass spectrometry technique. Results: The limits of quantification (LOQ=9.7pgmg-1), the accuracy (92.6%), the precision (inter 15.3%, intra 13.0%), the ion suppression (&lt;8.1%) and the recovery (88.3%) of the method were found satisfactory. Differences in the detection rates of the positive samples as well in detected levels of BPA between rural and urban population were observed. The 41.2% of the samples collected from urban population were positive whereas the positive samples from rural population were 14.8% (p=0.025). The mean concentration of the positive samples for the urban population was 64.1pgmg-1 (17.7-192.8pgmg-1), for the rural population 40.3pgmg-1 (13.1-72.8pgmg-1) and for the children 37.9pgmg-1 (13.1-72.8pgmg-1). Significant statistical differences (p=0.021) were observed though between urban and rural population only when negative samples were replaced with LOD/2 values. Conclusion: The proposed method was successfully applied for the determination of BPA in hair for the estimation of the population burden to BPA. © 2014 Elsevier Ltd
Достижения в области биомониторинга фосфорорганических и хлорорганических пестицидов
Organophosphorus (OPs) and organochlorine (OCs) pesticides are synthetic organic compounds used mainly in agriculture to manage pest problems. Human is occupationally and environmentally exposed to pesticides via inhalation, ingestion and skin absorption. When the pollutant enters human body it is rapidly metabolized to more toxic compounds than the parent compound. Their ability to interfere with biochemical and metabolic pathways in humans makes them compounds of high concern. Acute and chronic exposure has been linked with neurological, cardiovascular, birth effects and male infertility. Human exposure to pesticides is estimated by measuring their metabolites in biological tissues and fluids such as blood, urine, amniotic fluid and hair. In this review study advances on biomonitoring of pesticides are presented. Measured levels of pesticides in urine matrices, amniotic fluid, meconium and hair are presented in order to monitor the human burden and biomonitoring data between occupationally and environmentally exposed populations are being comparedФосфорорганические и хлорорганические пестициды – это синтетические органические соединения, используемые преимущественно в сельском хозяйстве для борьбы с вредителями. Люди подвергаются воздействию пестицидов в процессе профессиональной деятельности и при контакте с зараженной средой через их вдыхание, потребление с пищей и поглощение кожей. При попадании в организм человека поллютант быстро метаболизируется до более токсичных соединений, чем исходное вещество. Их способность взаимодействовать с биохимическими и метаболическими путями в человеческом организме делает их потенциально опасными соединениями. Обнаружена связь между острым и хроническим воздействием пестицидов и неврологическими и кардиоваскулярными эффектами, врожденными отклонениями и мужским бесплодием. Оценка воздействия пестицидов на организм человека проводится путем измерения их метаболитов в биологических тканях и жидкостях, таких как кровь, моча, амниотическая жидкость, а также в волосах. В данном обзоре представлены достижения в области биомониторинга пестицидов. Для оценки нагрузки на человека приведены измеренные уровни пестицидов в моче, амниотической жидкости, меконии и волосах. Проведено сравнение популяций, подвергшихся воздействию пестицидов в связи с производственной деятельностью и при контакте с окружающей средо
Imidacloprid and 6-chloronicotinic acid determination in blood serum of long-term exposed rabbits using LC-APCI-MS technique
Cardiotoxicity in rabbits after long-term nandrolone decanoate administration
Abuse of anabolic androgenic steroids is linked to a variety of cardiovascular complications. The aim of our study was to investigate the possible cardiovascular effects of nandrolone decanoate on young rabbits using echocardiography, histology and monitoring of telomerase activity, oxidative stress and biochemical markers. Fourteen rabbits were divided into three administration groups and the control group. Doses of 4. mg/kg and 10. mg/kg of nandrolone decanoate, given intramuscularly and subcutaneously, two days per week for six months were applied. A 4-months wash-out period followed. Focal fibrosis and inflammatory infiltrations of cardiac tissue were observed in the high dose groups. Thiobarbituric acid-reactive species (TBARS) levels were significantly increased in the high dose groups, while catalase activity decreased. Myocardial Performance Index (MPI) is the main echocardiographic index primarily affected by nandrolone administration in rabbits. Despite the preserved systolic performance, histological lesions observed associated with distorted MPI values, point to diastolic impairment of the thickened myocardium due to nandrolone treatment. Oxidative stress accumulates and telomerase activity in cardiac tissue rises. Subcutaneous administration seems to be more deleterious to the cardiovascular system, as oxidative stress, telomerase activity and biochemical markers do not appear to return into normal values in the wash-out period. © 2015 Elsevier Ireland Ltd
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