Musculoskeletal soreness has been reported with high exposures to

Musculoskeletal soreness has been reported with high exposures to: physical activity participation;3 use of information find more and communication technology such computers and electronic games;4 television viewing;3 and 5 writing or other intensive hand activities such as needlework or handicraft.6 Subsequently, position statements and evidence-based guidelines for children have been developed to ensure safe physical activity participation7 and wise computer use.1 Learning a musical instrument is a common activity amongst children and adolescents. In 2005, 20% (520 500) of Australian children aged 5 to 14 years played a musical instrument

outside of school hours.8 Learning music promotes positive cognitive, social, emotional and physical development in children and contributes to positive life-long learning experiences.9 However, playing a musical instrument is associated with rates of up to 67% of children having playing-related musculoskeletal problems,10 which is similar to the

rates of adult musicians.11, 12 and 13 The musculoskeletal problems of musicians include tendinopathies, nerve compression syndromes and focal dystonia, and are thought to have multiple risk factors.14 These include: intrinsic factors (age, gender, psychosocial); extrinsic music-related factors (type of instrument, music exposure); extrinsic non-music-related factors (participation in activities of daily living, physical activity or computer use), with interactions between intrinsic and extrinsic factors (playing posture is influenced by physical attributes

selleck inhibitor of instrument). There is limited research on playing-related musculoskeletal problems in children and adolescents, despite evidence that the development of musculoskeletal disorders commonly begins in adolescence.15 Emerging evidence suggests that age,16 and 17 gender,13 and 16 psychosocial factors,11 and 18 instrument type,11, 12, 14, 16, 19 and 20 music exposure,16 and 21 and playing posture14 contribute to musculoskeletal problems in young instrumentalists. However, the relevance of participation in non-music activity is unclear. Whilst a few instrumental studies have reported on non-music activity exposure in adults,11, 21, 22 and 23 only one has examined the association with playing problems. Zaza12 found no association between instrument Ketanserin playing problems and non-music activity participation – categorised as leisure activities (hobbies, physical activity), activities of daily living (house cleaning, child care, outside chores) and computer use – amongst 278 professional and tertiary music students. Only three studies have reported on non-music activity exposure in young instrumentalists or soreness from these activities,24, 25 and 26 but none have investigated the relationship between either exposure to non-music-related activity or non-music-activity-related soreness with playing problems.

In addition, although the cell line has recently been successfull

In addition, although the cell line has recently been successfully grown on Transwell® cell culture inserts ( Wang et al., 2009), its ability to form layers morphologically similar to the native upper airway epithelium at an air–liquid (AL) interface, as described for Calu-3

( Grainger et al., 2006) and NHBE ( Lin et al., 2007) cells, has not yet been demonstrated. Here, we report the optimisation of RL-65 cell culture conditions on Transwell® inserts at an AL interface. The morphology and barrier properties of cell layers grown in two different media were characterised. Additionally, expression of selected drug transporters was quantified and P-gp functionality investigated in the model. This study Volasertib mouse provides an initial appraisal of the suitability of AL interfaced RL-65 layers for filling the current gap between rat ex/in vivo and human in vitro absorption models in pre-clinical drug development. The RL-65 cell line was obtained from the ATCC (Rockville, MD, USA) and used for experiments between passage numbers 3 and 17 from purchase. Cells were cultured in 75 cm2 flasks using a serum-free medium composed of Dulbecco’s modified Eagle’s medium/Ham’s PFI-2 datasheet F12 nutrient mixture (DMEM/Ham F12) 1:1, supplemented with 85 nM selenium, 2.5 μg/ml bovine insulin, 5.4 μg/ml human transferrin, 30 μM ethanolamine, 100 μM phosphoethanolamine, 500 nM hydrocortisone, 5 μM forskolin, 50 nM

retinoic acid and 0.15 mg/ml bovine pituitary extract (Sigma–Aldrich, Poole, UK). Medium was exchanged thrice weekly and cells were passaged when 90% confluent using a 1:20 split ratio. Calu-3 cells were purchased from the ATCC, used between passages 25–30 and cultured as outlined previously by Madlova et al. (2009). Normal human primary bronchial

epithelial (NHBE) cells were purchased from Lonza (Slough, Berkshire, UK) and cultured (passage 2) using the Lonza proprietary B-ALI® kit according to the manufacturer’s instructions. RL-65 cells were seeded at a density of 1 × 105 cells/cm2 on 0.4 μm pore size, 1.13 cm2 polyester Transwell® cell culture supports (Corning Costar, High Wycombe, UK) Electron transport chain and cultured in submerged (LL) conditions or raised at an air–liquid (AL) interface after 24 h. The cell culture medium was either that outlined above with the addition of 100 IU/ml penicillin and 100 μg/ml streptomycin antibiotic solution (herein referred to as serum free medium (SFM)) or an alternative serum containing medium (SCM) comprising DMEM/Ham F12 (1:1) supplemented with 10% v/v fetal bovine serum (non-USA origin, Sigma), 100 IU/ml penicillin and 100 μg/ml streptomycin antibiotic solution, 2 mM l-glutamine and 1% v/v non-essential amino acids (all from Sigma). For LL culture, the apical and basolateral compartments of the Transwell® contained 0.5 ml or 1.5 ml of medium, respectively. For AL culture, 0.5 ml of medium was added to the basolateral chamber only. The medium was subsequently replaced in respective compartments on alternate days.

The Authors also thankful to Gulbarga University Gulbarga, Karnat

The Authors also thankful to Gulbarga University Gulbarga, Karnataka (India), for providing lab facility to carry out this study. “
“One of the best synthetic quinolone anti-infective agent is ciprofloxacin (1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperarinyl)-3-quinolone carboxylic acid) (Fig. 1).1 It is used for the treatment

of certain diseases caused by various Gram (−ve) and Gram (+ve) microorganisms.2 They are extremely useful for the treatment of a variety of infections, including urinary tract infections, soft tissue infections, INCB018424 nmr respiratory infections, bone-joint infections, typhoid fever, sexually transmitted diseases, prostatitis, community acquired pneumonia, acute bronchitis and sinusitis. In general, quinolones can act as antibacterial drugs that effectively inhibit DNA replication and are commonly used as treatment for many infections.3 In addition to that, ciprofloxacin is one of the emerging organic contaminants, most frequently detected fluoroquinolone antibiotics, although it is metabolized within the body.4 It causes renal failure, affects melanin, causes mental depression and

even leads to suicide attempt.5, 6 and 7 The potential environmental risks of antibiotics attract increasing attention due to their widespread usage and improper disposal. In addition to human health care purposes, antibiotics are also used for other purposes, including aquaculture, poultry farming and food processing. They can be detected in surface water, groundwater and seawater in concentrations in the range of ng L−1 to these μg L−1 and in some cases http://www.selleckchem.com/Akt.html even at mg L−1 levels.8, 9 and 10 The aim of this work was to develop an analytical method for the determination of ciprofloxacin by direct

measurement of its intrinsic ultraviolet absorption after complex formation with metal ions. Metal complexes are widely used in various fields such as biological processes, pharmaceuticals, analytical processes, separations techniques, etc. Most of the d-block elements form complexes. There are different kinds of ligands used for complexation. In literature, complexes of ciprofloxacin with diverse metal ions such as copper (II), vanadium (IV), magnesium (II), uranium (VI), manganese (II), iron (III), cobalt (II), nickel (II), molybdenum (II) and europium (III) have been reported and explored for their biological activities, because of its biological relevance.11, 12 and 13 This investigation carried out with divalent metal ion zinc, belonging to 3d-series and ciprofloxacin as ligand. Exactly 10 mg L−1 ciprofloxacin (AR, Merck) stock solution was prepared by dissolving 1 mg of this sample in 100 mL double distilled water. 0.1 N sodium hydroxide, 0.1 N hydrochloric acid and zinc sulphate (AR, Merck) were used in the experiments. All the reagents used were of analytical grade and they were used as such without further purification.

When a decision has been made to add a topic to the agenda for th

When a decision has been made to add a topic to the agenda for the KACIP to address, the KCDC requests the appropriate sub-committee or advisory committee to review all relevant data, gather the opinions of experts, and suggest policy recommendations. If no sub-committee or advisory committee yet exists that can address the topic, the KACIP requests the KCDC to gather relevant data for their review. VX-770 in vivo In considering the introduction

of a new vaccine or other change in the NIP, the relevant sub-committee and the KACIP examine all available data – both published and unpublished – on the disease burden in Korea, including clinical characteristics of the disease, and incidence, mortality, and case fatality rates. If local disease burden data are lacking, the sub-committee will examine available data from other countries, such as Japan, or will recommend that a local study be conducted. The sub-committee also compiles and analyzes data on the efficacy, effectiveness, and safety of the vaccine, including side effects and contraindications. Epigenetics inhibitor Sources of information on the vaccine include clinical trials conducted both in Korea and in other countries, WHO position papers, recommendations published by the U.S. Centers for Disease Control and

Prevention (www.cdc.gov), and the European Centre for Disease Prevention and Control website (www.ecdc.europa.eu). Information on the availability of a vaccine supply and sources of the vaccine are also considered. External experts are often asked to provide information and their views concerning the vaccine at both the sub-committee and KACIP meetings. For instance, the officer from the KFDA who was responsible for licensure of the vaccine in Korea may be asked to provide information

on the vaccine’s immunogenicity in the local population, safety profile, and clinical trial results. WHO recommendations are another key factor influencing decisions, including the goals and policies of the Western Pacific Regional Office (WPRO). The until regional goals to eliminate measles and prevent the transmission of hepatitis B from mother to infant were instrumental in the establishment of the special advisory groups for each topic and the enactment of national policies to reach both goals (see Section 7). At the same time, the KCDC often compiles and reviews economic data on the disease and vaccine, including the cost, affordability and financial sustainability of implementing the new vaccine program, as well as the vaccine’s cost-effectiveness (in terms of cost/QALY).

She is Co-PI for IMPACT’s Invasive Meningococcal

She is Co-PI for IMPACT’s Invasive Meningococcal MK-8776 price Surveillance project. She was involved with conception and design of the invasive meningococcal surveillance project and the study reported here as well as data acquisition. She analyzed and interpreted the data and wrote and revised the submitted manuscript. D.W. Scheifele is the IMPACT Data Center Director and Co-PI for IMPACT’s Invasive Meningococcal Surveillance project. He was involved with conception and design of the meningococcal surveillance project and the study reported here as well as data acquisition and interpretation of the data. He revised and approved

the submitted manuscript. S.A. Halperin is one of two Co-PIs for the IMPACT surveillance network. He was involved with conception and design of the meningococcal surveillance project and the study reported here as well as data acquisition. He revised and approved the submitted manuscript. W. Vaudry is the second of IGF-1R inhibitor two Co-PIs for the IMPACT surveillance network. She was involved with conception and design of the meningococcal surveillance project, the study reported here and data acquisition. She revised and approved the submitted manuscript. J. Findlow was responsible

for characterizing the serogroup B isolates by MATS and sequencing fHbp, NHBA and NadA at the Health Protection Agency. He revised and approved the submitted manuscript. R. Borrow was responsible for characterizing the serogroup B isolates by MATS and sequencing fHbp, NHBA and NadA at the Health Protection Agency and was involved with interpretation of the data. He revised and approved the submitted manuscript. D. Medini provided access to and explanation of the laboratory and statistical methods used in the Plikaytis et al. inter-laboratory study and the Donnelly et al. MATS manuscript. He revised and approved the submitted manuscript.

isothipendyl R. Tsang is responsible for the maintenance of the IMPACT N. meningitidis isolate collection at the National Microbiology Laboratory. He was responsible for the serogroup and sequencing typing of the serogroup B isolates and was involved with interpretation of the data. He revised and approved the submitted manuscript. Conflicts of interest: JAB: ad-hoc Advisory Boards (Novartis Vaccines, Canada) and speaker honoraria (Novartis Vaccines, Pfizer Inc., Baxter Inc.). SAH: ad-hoc Advisory Board for Novartis Vaccines, Canada and speaker honoraria in the past year (Novartis Vaccines). DWS: ad hoc Advisory Board for Novartis Vaccines, Canada. WV: Data Safety and Monitoring Board, Novartis Vaccines. RB has performed contract research on behalf of the Health Protection Agency for Baxter Biosciences, GSK, Novartis, Merck, Pfizer and Sanofi Pasteur.

, 2013) Furthermore the viscoelastic properties of NFC resemble

, 2013). Furthermore the viscoelastic properties of NFC resemble the physiological Kinase Inhibitor Library cost properties of extracellular matrices (Bhattacharya et al., 2012 and Miron-Mendoza et

al., 2010). The NFC aqueous suspensions behave as 1-compartmental hydrogels with pseudoplastic and thixotropic properties (Pääkkö et al., 2007). Pseudoplasticity induces a shear thinning effect which reduces viscosity with increased shear stress. Shear thinning therefore enables NFC hydrogels to be easily injected (Bhattacharya et al., 2012) as the extruding force of the syringe is enough to change NFC flow properties to lower the viscosity. While in static conditions, NFC retains higher viscosity due to the rearrangement of the fibers, which reverts the shear thinning effect. As an injectable hydrogel, NFC is able to deliver cells or therapeutic agents (e.g. proteins or peptides) into easily accessible target sites, such as under the skin. Additionally NFC hydrogels are biocompatible, non-toxic, and structurally

durable (Märtson et al., 1999 and Vartiainen et al., 2011). As a plant derived material, the NFC hydrogels are obtained from a non-animal and non-human source, being click here thus xeno-free. Additionally, cellulose based materials offer a broad modification capacity (Klemm et al., 2011), which is advantageous when designing new biomaterials. Currently, in biomedical and -pharmaceutical research, the hydrogels under investigation for the potential use of controlled release matrices can prove to be problematic in terms of gel activation properties (Hennink and van Nostrum, 2002), especially with injectable hydrogels. The need for an external source of activation presents additional complications and toxicity as crosslinking agents often used are potentially toxic compounds (Van Tomme et al., 2008), that need to be extracted from the gels before usage. This could prove to be difficult in the case of parenteral delivery,

such as subcutaneous injections. Furthermore, the crosslinkers may react with the imbedded drug compounds within the hydrogel, which ADAMTS5 may result to unwanted consequences or ineffective treatment. NFC overcomes this obstacle, as there is no need for activation methods such as the use of UV irradiation or chemical crosslinking due to the pseudoplasticity of the material. After administration (e.g. subcutaneous injection), NFC “gels” spontaneously, as the fibers rearrange to form a viscous gel; therefore avoiding all the complications with removing the crosslinking agents, potential toxicity or interactions between the crosslinking agents and the drug compounds in use. The aim of this study was to investigate the properties of plant-derived NFC hydrogel as an injectable platform or “implant” for drug release, in addition to examine the utility of SPECT/CT imaging to illustrate the behavior of hydrogels in vivo.

aureus BHU 011, E faecalis BHU 021 by agar dilution method and f

aureus BHU 011, E. faecalis BHU 021 by agar dilution method and for MIC against M. tuberculosis by Indirect proportion method (IPM). The results of these bacterial bioassays are given in Table 3. Highest zone of inhibition (26 mm) was observed

against S. aureus ATCC 25923 at the selleck compound dose of 3.0 mg. The antibacterial activities of 75% methanol extract from A. paniculata leaves were observed only against the S. aureus ATCC 25923. The extract was not found active against Proteus vulgaris and E. coli ATCC 25922. The MIC value of the active extract against the strains showing promising results in qualitative tests were determined for quantitative assessment of antibacterial potential, which also showed a strong antibacterial potential in it. The lowest MIC value observed was 2.0 mg/ml for S. aureus ATCC 25923 whereas highest was 5.0 mg/ml against M. tuberculosis H37Rv ( Fig. 1). Thin layer chromatographic separation of methanol extract of A. paniculata leaves resulted in four bands. Out of these four bands, only the fourth band was found to be active against S. aureus ATCC 25923. Phytochemical investigation of this active fraction exhibited the presence of terpenoids in it. Microbiology in twenty-first century begins with abundance of the articles concerning

resistance, superbugs and the prospects of a post-antibiotic era. In addition, the Selleckchem AT13387 threat of bioterrorism with multi-drug resistant pathogens emphasized the need for continued development of new antibiotics. Currently, the ongoing battle against bacteria prevails certainty of evolving resistance. On the other hand, advancement in medical sciences results in more patients in critical and immune suppressed states, thus creating a perpetual need for new antibiotics. But unfortunately,

there is a subsequent decline in both academic and industrial research in this field. As a result, current rate of discovery of new antibiotics is far lower than in the golden age of antibiotics in the (1940s–1960s).8 Medicinal plants and their extracts were used as first medicines since ancient times. Medicinal plants may be defined as any plant that has medicinal use such as foxglove, opium, garlic, turmeric, etc. Plants may be an important source of PAK6 potentially useful structures for the development of new chemotherapeutic agents.9 The first step towards this goal is the in vitro screening of plant extracts for their bioactivity. In the present study, leaf extracts of three different plants have tested against clinical pathogens. In our preliminary screening, the number of bacterial strains was determined in accordance with their cell wall structure. Sensitive strains of Gram negative and Gram positive bacteria were chosen assuming that one strain each of Gram positive and Gram negative bacteria is enough for the screening of antibacterial activity of the extracts. S. aureus and E.

The contents of each flask were extracted with n-hexane (1:1) for

The contents of each flask were extracted with n-hexane (1:1) for twice. The extracted organic layer was evaporated at 60 °C (hot air oven) and finally resuspended in 10 ml acetonitrile. 17 20 μl of the extract was injected onto a reverse phase HPLC (C-18) column using water/acetonitrile (20:80, v/v) gradient ZD1839 mw with a flow rate of 1 ml/min.18 The PAHs were detected using UV (254 nm)

absorbance detection and then the degradation was quantified against negative control. Gram stain, spore stain, motility test and other common biochemical tests like carbohydrate utilization, nitrate reduction, urease, catalase, amylase activity etc. were performed with the chosen isolate.19 Egg yolk agar plate was prepared with a composition20 of peptic digest of animal tissue 40 g, dextrose 2 g, disodium phosphate 5 g, monosodium phosphate 1 g, NaCl 2 g, MgSO4 0.1 g, agar 25 g, egg yolk 100 ml, pH 7.2, Bacteria was streaked on the plate and then incubated at 30 °C for 48 h.

Lipase activity affirmed the ability of oil degradation by a microbe.21 Hemolytic activity of the isolate was determined by streaking the culture on sheep blood (10% V/V) agar plate at 30 °C for 48 h.22 The isolate was incubated in 25 ml mineral medium supplemented with 2% hexadecane. The soup was collected after 1, 2, 3 and 4 days of incubation followed by centrifugation at 9000 rpm for 15 min. Surface tension (ST) of the supernatant was measured Volasertib nmr by drop count method.23 One negative control was also maintained. The isolate was streaked on 4% gelatin agar plates (peptone 5 g; NaCl 5 g; beef extract 1.5 g; yeast extract 1.5 g; gelatin 4 g; distilled water 100 mL), after 1 day of incubation the plate was flooded with mercuric

chloride reagent.24 16S rDNA genes of the isolate were amplified by polymerase chain reaction (PCR)25 using bacteria-specific 27F, 357F and the universal 1492R primers as 5′-AGAGTTTGATCCTGGCTCAG-3′, 5′ CTCCTACGGGAGGCAGCAG-5′ ADAMTS5 and 5′-CGGCTACCTTGTTACGACTT-3′, respectively. Then the PCR products were sequenced by 3730 automatic sequencing equipment (ABI, US). A phylogenetic tree was made using nBLAST and neighbor-joining method. The pH of the soil was determined as 7.2. A few bacterial colonies appeared only on nutrient agar plate where soup from PAH supplement MSM inoculated but none from the placebo soup. Four distinct colonies were randomly selected for further study. Out of four isolates three showed comparable growth but one showed only minimal growth (Fig. 1). The slowest growing (anthracene degrading) bacteria was not selected for further study. One isolate among the three isolates showed better growth on MSM-fluoranthene agar plate (Fig. 2). This isolate was chosen for subsequent study. Bacterial growth curve on two substrates fluoranthene and pyrene were drawn and compared with each other. The graph showed that the isolate degraded fluoranthene better than pyrene (Fig. 3).

This may have resulted in accelerated waning of immunity

This may have resulted in accelerated waning of immunity Selleckchem AZD9291 in the HRV_2D group, and consequently lack of efficacy over a 2-year period. The immunogenicity of a HRV_2D compared to HRV_3D in settings such as ours, however, needs further validation as our study was not powered to address this. A third further possible reason for decreased efficacy of Rotarix in our setting over 2 consecutive seasons may relate to the possibility of severity of gastroenteritis episodes in which rotavirus is identified during the second year being due to co-infection with other enteric pathogens. In this study,

co-infections were not evaluated. Co-infection with rotavirus and other bacterial and viral enteropathogens has been observed in infants and toddlers in similar settings,

and occurs in about 20% of cases [27] and [28]. As it is not possible to rule out the possibility of co-infection contributing to severe gastroenteritis symptoms rather than rotavirus per se being responsible for the illness severity in our study, this also needs to be evaluated further. The possibility of co-infection contributing to more severe illness in subsequent years is corroborated by the observation that rotavirus infections after the first natural rotavirus infection are significantly less severe than first rotavirus infection [21]. As HRV mimics natural rotavirus infection, theoretically subsequent rotavirus Selleck Galunisertib infection in vaccinees should be less severe.

However, the persistence of protection observed in the HRV_3D group make it unlikely that this is a major reason for the diminished vaccine efficacy over 2 consecutive rotavirus Carnitine palmitoyltransferase II seasons in the HRV_2D group. These data, together with the exploratory analysis which indicated higher point estimate of sero-conversion rates in the HRV_3D group (66.7%) than HRV_2D group (57.1%), indicate that a 3-dose schedule of Rotarix may have an advantage in providing longer-term protection against severe RVGE and severe all-cause gastroenteritis than a 2-dose schedule. The sero-conversion rates are similar to those observed in an earlier immunogenicity study in South Africa, which also reviewed the 2-dose schedule at 10 and 14 weeks of age and the 3-dose schedule at 6, 10 and 14 weeks of age [18]. Although South Africa has introduced a 2-dose schedule of Rotarix, based on its licensure conditions, the dosing schedule being used includes a dose at 6 and 14 weeks of age, rather than the 10 and 14 weeks of age schedule evaluated in our study. The rationale for this dosing schedule included the aim of conferring protection as early as possible with the first dose of vaccine being at 6 rather than 10 weeks of age and minimizing missing the opportunity of vaccination at the earliest well-baby visit.

Chromatography was performed on 10 × 10 cm2 aluminum HPTLC plates

Chromatography was performed on 10 × 10 cm2 aluminum HPTLC plates precoated with 0.2 mm layers of silica gel (E. Merck, Darmstadt, Germany; supplied by Merck India, Mumbai, India). Before chromatography, the plates were prewashed with

methanol and dried in an oven at 50 °C for 5 min. Samples were applied as 6-mm wide bands, under a continuous flow of nitrogen, MI-773 cell line by means of a CAMAG (Muttenz, Switzerland) Linomat V sample applicator equipped with an applicator microsyringe (Hamilton, Bonaduz, Switzerland). A constant application rate of 0.1 μL s−1 was used. The plates were then conditioned for 20 min in a presaturated twin-trough glass chamber (10 × 10 cm2) with the mobile phase of chloroform–toluene–methanol–acetic acid (8:1:1:1, v/v/v/v). The plates were then placed in the mobile phase and ascending development was performed to a distance of 70 mm from the point of application at ambient temperature, Panobinostat cell line and the development time was 12 min. Subsequent to the development, the plates were dried in a current of air with the help of an air dryer and spots were visualized in CAMAG UV cabinet with dual wavelength UV lamp (254 and 366 nm); densitometric scanning was performed at 365 nm with CAMAG TLC scanner III operated in reflectance–absorbance mode and controlled by Wincats V software. The concentrations of compound were studied from the intensity of diffusely

reflected light. Evaluation was based on linear regression of peak areas. A stock solution containing 1 mg mL−1 LER was prepared in methanol. Calibration solutions were prepared by diluting the stock solution so that application of 1 μL volumes gave a series of spots covering the range 30–210 ng LER. The developed method was validated for linearity and range, specificity, precision, accuracy

and robustness as per ICH guidelines.7 and 8 Each concentration found in the range of 30–210 ng per spot was spotted five times on individual plates and response was measured after scanning. For evaluation of linearity, peak area and concentrations were subjected to least square regression analysis to calculate calibration equation and correlation coefficient. The specificity of the method was ascertained by analyzing LER in presence of excipients of LER tablet formulations. The bands of LER in the sample were confirmed by comparing RF values and respective spectra of the sample with those of the standard. The peak purity of LER was assured by comparing the spectra at three different levels, that is, peak-start (s), peak-apex (m) and peak-end (e) positions. Precision was measured by using standard solutions containing LER at concentrations covering the entire calibration range. The precision of the method was evaluated by calculating the percent relative standard deviation (%RSD) of mean peak areas obtained from each spot of sample. Same procedure was performed at different time intervals on the same day, on different days and by different analysts.