جستجوی مقالات مرتبط با کلیدواژه "ms" در نشریات گروه "پزشکی"

Amino acid analysis is an important tool for the diagnosis of metabolic disorders in newborns. Today, Liquid Chromatography tandem mass spectrometry (LC-MS/MS) has emerged as a powerful technique for amino acid analysis. We aimed to determine the local normal range of amino acids in dried blood spot (DBS) samples of neonates using LC-MS/MS.

A total of 1005 samples from healthy neonates of northeast and east of Iran aged 2-7 days were utilized for normal range determination. The amino acids were extracted from dried blood spot samples using organic solvent and then analyzed using LC-MS/MS system. The 1%, 2.5%, 97.5%, and 99% percentiles were calculated, and the results were compared to the global cut-off values.

The results showed that glutamic acid has the highest concentration range among amino acids evaluated in this study (178.94 – 421.31mmol/L). Moreover, the plasma concentrations of Glycine (142.65 – 397.06 mmol/L), Alanine (97.00–349.72 mmol/L), Proline (63.77 – 236.53 mmol/L), and Tyrosine (25.79 – 150.58 mmol/L) were in the next ranks. Comparing the obtained results with the global values obtained in the R4S study indicated a slight difference between the obtained local normal values and the global values.

The calculated values were slightly different from global values obtained in the R4S study and regional values calculated in other studies. This further emphasized the importance of the local establishment of reference values, which facilitates the correct interpretation and diagnosis in the Newborn Screening Programs.

Prior research has indicated that hydroxycitric acid (HCA) can impede the formation of calcium oxalate (CaOx) crystals, yet the specific mechanisms underlying its therapeutic effects remain unclear. In this study, we delved into the protective effects of HCA against glyoxylate-induced renal stones in rats and sought to elucidate the underlying metabolic pathways.

Forty rats were randomly assigned to five groups: control group,   model group, L-HCA-treated group, M-HCA-treated group, and H-HCA-treated group. Von Kossa staining was conducted on renal sections, and blood urea nitrogen and serum creatinine were determined by biochemical analysis. Meanwhile, body weight and urine volume were also measured. We subjected urine samples from the rats to analysis using ultra-performance liquid chromatography-quadrupole time-of-flight mass spectrometry. Next, we employed a metabolomic approach to scrutinize the metabolic profiles of each group.

HCA significantly reduced blood urea nitrogen and serum creatinine, and increased body weight and urine volume. It also reduced CaOx crystal deposition. A total of 24 metabolites, exhibiting a significant reversal pattern following HCA administration, were identified as urine biomarkers indicative of HCA’s preventive effects against CaOx crystal-induced renal injury. These metabolites are primarily associated with glycine, serine, and threonine metabolism; phenylalanine metabolism; tricarboxylic acid cycle; taurine and hypotaurine metabolism; and tryptophan metabolism.

It was demonstrated that HCA has a protective effect against CaOx crystal-induced kidney injury in rats by modulating various metabolic pathways. Additionally, results suggest that HCA holds promise as a potential clinical therapeutic drug for both the prevention and treatment of renal stones.

Antibiotics are widely used in poultry to increase meat production and prevent infections. The aim of this study is to quantitative and qualitative determination of antibiotic residue in the chicken samples. The antibiotic residues were extracted from the local and imported broiler chicken samples by applying modified established methods and quantified them by liquid chromatography-mass spectrometry (MS/Q-TOF). Both antibiotics were extracted from the meat and kidney collected from chicken using well-established methods. The extracted samples were analyzed by using the sensitive MS/Q-TOF. The experimental results showed that collected local and imported chicken samples contain five analyzed antibiotics and are within the permissible limit except for gentamicin. In the imported meat sample, the highest amount of antibiotics was, sulfanilamide, and the lowest was levofloxacin. However, in the local breast meat samples, among the analyzed antibiotics, the amount of gentamicin in both local chicken collected from Al Safwa and Waeel is too high, 0.202 m kg-1 and 369.87, respectively compared to the maximum residue level (MRL). Other antibiotics in the breast meat samples are within the MRL values. In kidney samples in the local broiler chicken, the amount of all analyzed antibiotics was within the MRL values. The highest concentration was sulfanilamide, followed by gentamicin > oxytetracycline > chloramphenicol > levofloxacin. In conclusion, all the imported and local broiler meat and kidney contains the five analyzed antibiotics within the MRL values, except gentamicin was available in high amounts in the local breast meat. In conclusion, the excessive amount of gentamicin in the chicken samples through diet will create significant health troubles.

Acylcarnitine is one of the crucial markers of fatty acid metabolism, and examination of their level in infants can reveal several Inherited Metabolic Disorders (IDM) or Inborn errors of Metabolism (IEM). Because of the great importance of hereditary, metabolic, and other inherited disorders early diagnosis before the appearance of clinical symptoms, this study was carried out to establish a reference range for carnitine analytes and to identify acylcarnitine profiles in normal weight neonatal dried blood spots (DBS) specimens.

By using liquid chromatography tandem mass spectrometry (LC-MS/MS) for neonatal screening and eventually the examination and analysis of LC-MS/MS results, 34 acylcarnitine derivatives were identified.

The normal range for acylcarnitine analytes with carbon numbers ranging from zero to 18, both main and the branched ones, were ultimately measured. Afterward, they were compared with the results of some other diagnostic laboratories to be verified.

This study differed from the other findings, which could be due to diversity in population and work methods. However, the reference range of most acylcarnitine derivatives in Tehran closely aligned with this study's findings.

Based on basic traditional medicine practice, many plants undergo primary treatments to improve their pharmacological characteristics or to attenuate unwanted or unfavorable features of drugs before incorporating them into drug formulations. These treatments are called “Tadbir” in Traditional Persian Medicine (TPM). The purpose of these processes includes but is not limited to eliminating unnecessary compounds, excluding harmful properties such as toxicity and poignancy, and improving their overall natural properties and effectiveness. Here, the effect of vinegar and acetic acid treatment on three herbal specimens, including Carum carvi L. fruits (CC), Trachyspermum ammi (L.) Sprague fruits (TA), and Nigella sativa L. seeds (NS) were investigated. The treated and non-treated samples were subjected to essential oil and methanol extraction. Further, to assess the alterations in the essential oil constituents caused by Tadbir, samples were analyzed by Gas Chromatography/Mass Spectrometry (GC/MS) and HPTLC fingerprinting techniques. Total phenol and flavonoid content and DPPH free radical scavenging activity of methanol extracts were evaluated. As a result of the treatments, TA extracts showed significant rise in phenol and flavonoid contents. Total phenol content increased from 98.50±1.01 in non-treated increased to 181.20±0.27 mg GAE/g Ext. in the vinegar-treated TA fruit extract and total flavonoid showed a rise from 8.97±1.12 to 12.89±0.41 mg QE/g Ext. This may be the reason behind its lower IC50 values in DPPH free radical scavenging assay. Interestingly, Tadbir treatment of TA fruits with 4% acetic acid, lowered the IC50 value from 1019.42±75.65µg/mL in non-treated control to 274.2±17.22 µg/mL; while vinegar caused a lower degree of reduction in IC50 value (369.4±5.54 µg/mL) in DPPH free radical scavenging assay. However, CC fruit extracts, showed a decrease in phenolic content; while demonstrating an increase in flavonoids. Interestingly, phenol and flavonoid contents were significantly enhanced in treated NS seed extracts. The results of all extracts were found significantly different (p<0,05) from each other and the non-treated control. The conclusive results of the present study may partly justify the pre-application of Tadbir treatments of medicinal plants in traditional pharmacy.

Sofosbuvir (SOF) is a revolutionary treatment for patients with hepatitis C virus (HCV). However, its efficacy and safety among patients with end-stage renal disease (ESRD) remains controversial. In this study, we examined the levels of SOF metabolite (GS-331007) (SOF-007) in human plasma of patients infected with HCV having ESRD using an optimized liquid chromatography-mass spectrometry (LC-MS) analytical method.

In this case-control study, 10 clinically confirmed cases and five controls were enrolled. SOF-007 was extracted from plasma using methanol precipitation. The limit of detection (LOD) for the drug and its metabolite were 0.85 and 2.3, respectively. Such a wide range of quantification in a period of separation time shorter than 3.0 minutes (run time) allowed monitoring of the plasma concentration of analytes up to 4 hours (pre-dialysis and post-dialysis) for 12 weeks in non-cirrhotic patients with HCV infection undergoing dialysis.

SOF-007 in the plasma of HCV patients with healthy kidneys showed no cumulative effect. An analysis comparing patients with ESRD and healthy participants showed that their behaviour was similar, followed by dialysis with a relatively small cumulative effect.

The plasma concentrations of SOF-007 decreased significantly after the 4-hour period of dialysis compared with the plasma concentrations hemodialysis of pre-dialysis in HCV patients with ESRD.

Citrus aurantium L. hydrosol extracted by steam distillation from its flowers is a highly consumed herbal product in the Iranian traditional market, widely used as a food flavor and therapeutic food and drinks. This study investigated ten commercial hydrosol samples of C. aurantium flowers produced by conventional extraction methods and industrial processes, as well as a laboratory-prepared control sample. A liquid-liquid extraction method and sonication were used to extract essential oils from commercial hydrosols. Samples were then subjected to GC/MS analysis. ATR-IR spectroscopy was another efficient tool used to analyze hydrosol samples. All HPTLC chromatograms exhibited a close resemblance between samples and controls. The cluster analysis was used to compare the results of GC/MS and IR screening. In the HCA dendrograms derived from the GC/MS data, most of the oil sample profiles were found to be very similar to those of the control. Linalool was the most abundant compound in eight samples and the control. α-Terpineol in all hydrosol samples and geraniol in five samples and control were other marker compounds. Ethyl disulfide, dillapiol, and hotrienol were detected in two samples that have not been reported in previous studies and might have resulted from the addition of other herbal hydrosols. Microbial content and pH values were within permissible limits in all samples, making them safe for oral consumption.

Maternal separation (MS) is a well-characterized model of early life stress, based on the postnatal disruption of the mother-infant interaction. Studies on rodents have demonstrated that MS, as an early adverse life event, leads to spatial memory deficits and lasting changes in brain plasticity. Here, we review data from animal studies regarding the impact of MS on long-term potentiation (LTP). Evidence shows that animal models are useful for evaluating the effects of MS on LTP. Overall, studies suggest that MS impairs LTP.

The current study was conducted to assess the protective mechanisms of n-BuOH fraction from the aerial part of Genista cephontala (BEGC) on APAP-induced liver injury compared to necrostatine-1 (Nec-1).

A model of APAP-induced hepatotoxicity was created in male rats by injecting a single dose; 1000 mg/kg APAP, the protective effect was performed with (200 mg/kg; 10 days) BEGC compared to Nec-1, (1.8 mg/kg).

BEGC or NeC-1 pretreatment significantly abolished impaired effects in APAP-rats, by decreasing the generation of TBARS and ROS in mitochondrial and cytosolic fractions and maintaining liver function activities. A marked response was observed in the levels of both GSH and GSH-system enzymes in liver homogenates and mitochondrial fractions to BEGC. BEGC/ Nec-1 successfully regulated the inflammatory mediators (IL-β, TNF-α, HMGB1, and acHMGB1) and MPO levels. During APAP treatment, no caspase-3 or -8 activity was detected, and the level of fk18; M30 was higher than the levels of cck18; M65. Moreover, RIPK3 and MLKL levels were increased in the APAP group. These results suggested that necroptosis predominates during the APAP liver injury model. Interestingly, these necroptotic factors were significantly down-regulated by BEGC treatment. Both biochemical and histopathological findings were consistent with each other.

From all these findings, the hepatoprotective effect of BEGC could be due to the abundance of polyphenols identified by LC-MS/MS analysis, as well as the synergistic interactions of all contents.

Male infertility is usually determined by the manual evaluation of the semen, namely the standard semen analysis. It is currently impossible to predict sperm fertilizing ability based on the semen analysis alone. Therefore, a more sensitive and selective diagnosis tool is required.

Twelve fresh semen samples were collected from fertile volunteers attending the Avicenna Fertility Center (Tehran, Iran). The seminal plasma (SP) was prepared and subjected to liquid chromatography-tandem mass spectrometry (LC-MS/MS), and the total antioxidant capacity (TAC) was analysis. Thirty-four amino acids including essential amino acids (EAA), non-essential amino acids (NEAA), and non-proteinogenic amino acids (NPAA) relative concentration were determined, and the correlation between their concentration with spermiogram parameters and TAC of the SP was analyzed.

Significant positive correlations have been found between selected amino acids with the motility (Met and Gln, rs=0.92; Cys, rs=0.72; and Asn, rs=0.82), normal sperm morphology (Met, rs=0.92; Cys, rs=0.72; Glu, rs=0.92; and Asn, rs=0.82), and sperm concentration (Trp, Phe, and Ala). In contrast, several AAs, including Gly, Ser, and Ile showed negative correlations with sperm concentration (rs=-0.93, r=-0.92, and r=-0.89, respectively). Furthermore, TAC showed a positive association only with Tyr (rs=0.79).

The strong positive/negative correlations between the seminal metabolic signature and spermiogram demonstrate the significance of determining metabolite levels under normal conditions for normal sperm functions. Combining the metabolome with the clinical characteristics of semen would enable clinicians to look beyond biomarkers toward the clinical interpretation of seminal parameters to explain the biological basis of sperm pathology.

Multiple sclerosis (MS) is the most prevalent neurological disability among young adults. Anti-inflammatory drugs have shown to be effective in MS. The anti-inflammatory and antioxidative properties of Zingiber officinale (ginger) have been shown and proven in many phytotherapy studies. This study aimed to evaluate effects of ginger essential oil on preventing myelin degradation in a rat model of MS. In this study, we divided 49 rats into 7 groups; 4 control and 3 experimental groups that received 3 different dose of ginger essential oil (50, 100, and 150 mg/kg/day) for treatment of cuprizone-induced demyelinated rats. Basket test and transmission electron microscopy were performed in this study. Olig2 and Mbp genes and proteins were respectively evaluated by reverse transcription-polymerase chain reaction (RT-PCR) and enzyme-linked immunosorbent assay (ELISA). Histologically, cuprizone created demyelination in the corpus callosum fibers. Remyelination of fibers was seen in the group treated with the medium dose of ginger essence, by toluidine blue staining. transmission electron microscopy (TEM) revealed increased thickness of the myelin of fibers in all 3 treated groups (p<0.05). Feeding by the medium dose of ginger essence significantly increased the levels of Mbp and Olig2 genes (p<0.05).  ELISA test showed that 100 mg/kg/day of ginger caused a significant difference between experimental and the cuprizone-induced groups (p<0.05). Our findings suggested that administration of ginger essential oil prevented demyelination and improved remyelination of rats` corpus callusom and can be used as an effective substance in the prevention of MS.

Early detection of breast cancer (BC) is extremely important as late diagnosis has been associated with a high rate of mortality. Immunogenic proteins and autoantibodies have been considered as favorable targets for early detection and targeted therapy in cancer. Accordingly, the present study aimed to identify the immunogenic antigens in both early and advanced stages of BC via a serologic proteome analysis (SERPA) approach.

This is a case-control study wherein we separated the proteins from BC tissues in the early stages (n = 10) and advanced stages (n = 10) utilizing two-dimensional electrophoresis (2DE) and then transferred them onto a Polyvinylidene Difluoride (PVDF) membrane. To explore the tumor antigens reacting with antibodies, two-dimensional (2D) blots of tumor tissues in the early and advanced stages were separately probed with the sera from the same patients. Afterwards, we identified antibody-reactive proteins via liquid chromatography with tandem mass spectrometry (LC-MS/MS).

Fibrinogen beta chain (FGB), protein deglycase DJ-1(PARK7), and peroxiredoxin-2 (PRDX2) were the highly reactive antigens identified in the earlystage patients. In addition, RuvB-like1 (RUVBL1) and triose phosphate isomerase (TPI) were recognized as the immune reactive proteins in the late-stage patients.

The results herein revealed that the immune-proteome pattern of BC patients changes along with tumor progression from primary to advanced stages. Moreover, immunogenic proteins seemed to stimulate the humoral immune system to produce autoantibodies in the initiation phase of BC; these autoantibodies could be employed as complementary factors for early detection of BC. The findings are however preliminary, and further studies with a larger sample size are required for verification and validation of previous findings.

The aim of this study is to investigate some pesticides, including organic phosphorus compounds and carbamates, on tobacco leaves, which are commonly used in agricultural activities to increase crop production around the world. Humans are exposed to pesticides through residues left in fields, which have harmful effects on the body.

The study collected a total of ten samples of tobacco leaves, five from different cultivation areas in Iran and five from five different countries as imported samples. The collection was done three times to ensure that the results were reliable and consistent. To determine the residual concentration of organophosphorus and carbamate pesticides, we collected 210 samples using the QuEChER method to prepare the samples. The residual levels of 26 pesticides were measured using the GC-ECD and UHPLC-MS/MS methods.

Most samples had residual levels of pesticides below the detection limit. However, in Iranian samples, the highest average concentrations were found for Thiodicarb (μg/kg 525.2), Chlorpyrifos (μg/kg 499), Dichlorvos (μg/kg 260.3), Penconazole (μg/kg 208), Thiophanate-methyl pesticides (μg/kg 168.5). For imported samples, Thiodicarb (525.2 μg/kg) and Dichlorvos pesticides (260.3 μg/kg) had the highest average residual concentration.

Despite severe restrictions on pesticide use in the sampled specimens, residual amounts of these chemicals persist, which can contribute to the adverse health effects of smoking. Therefore, more effective monitoring and surveillance measures are necessary.

Polyamines prolong longevity due to their role in cell proliferation and are regarded as an essential group of anti-aging substances that reduce the risk of cardiovascular, neurological, and chronic inflammatory illnesses, as well as cancer. Because of its importance in growth and tissue regeneration, discovering polyamine-rich sources has gotten a lot of interest. Given the role of polyamines in controlling plant growth and physiological changes in the spring after cold winter stress, high polyamine concentrations in quickly growing plant tissues such as flowers, blossoms, and germs are possible. Based on this premise, five different spring flowers were selected and isolated from relevant plants, dried, and then quantified for the first time using an accurate, simple, and repeatable quantification method, liquid chromatography–tandem mass spectrometry. According to the amount of spermidine found in the samples investigated in this study, dried flower powders of Wisteria sinensis (244.18 µg/g), Lonicera caprifolium (217.28 µg/g), and Jasminum officinale (200.33 µg/g) appear to be a good source of spermidine. With additional research, W. sinensis dried flower powder is a good source of polyamines, whereas L. caprifolium and J. officinale dried flower powders are recommended as a rich source of spermidine for the preparation of natural supplements for people over the age of 30 to improve cell proliferation and anti-aging.