Anahita Hamidi, Abdolhamid Bagheri, Hossein Fakkhrzadeh, Ramin Heshmat, Alireza Moayyeri, Mohammad Jafar Mahmoudi, Rasoul Pourebrahim, Ozra Tabatabaee, Bagher Larijani,
Volume 4, Issue 2 (17 2004)
Abstract
Background: Leptin is an adipocyte- derived hormone that plays an important role in the pathogenesis of obesity. Obesity is associated with insulin resistance and hyperinsulinemia. Insulin resistance is one of the factors which have been suggested to affect leptin serum levels. There are few studies evaluating the relation between leptin level and insulin resistance in childhood and adolescence obesity. The aim of the present study is to investigate this relationship in Iranian obese children.
Methods: We screened 13089 primary school students aged 7-12 years. Children were divided to overweight and normal based on the recently published National Center for Health Statistics growth charts. The number of children which were overweight was 498, of whom 347 subjects particiated in the study. Fasting blood glucose, insulin and leptin levels were measured and homeostasis model assessment (HOMA) of insulin resistance (HOMA-IR) and fasting glucose to insulin ratio (FGIR) were calculated and compared between two groups.
Results: Serum leptin levels were significantly higher in overweight compared to normal group. (11.58±8.1 and 8.1±5.2 respectively p<0.05). Before adjustment for BMI, there was a significant correlation between leptin and fasting insulin, HOMA –IR index and FGIR. (r=0.1, p< 0.05, r=0.1 , p<0.01, r=0.07, p<0.05 respectively). After adjustment for BMI, no significant correlation was found (r=0.097, p=0.20).
Conclusion: The relation between leptin and insulin resistance was weak and disappeared after adjustment for BMI. It seems that many other factors including BMI and total fat amount may affect this relationship. Further studies in this field are required.
Benazir Golavar, Ali Sheibani, Masoumeh Tabatabaee,
Volume 18, Issue 5 (7-2019)
Abstract
Background: The ion mobility spectrometry (IMS) is an analytical technique that is widely used due to its high sensitivity and speed for the detection of ionized molecules in gas phase and under atmospheric pressure. Breath analysis is a new method for obtaining information about person's clinical conditions that is considered by researchers. Human exhaled air contains a variety of components such as water vapor, hydrogen, acetone which in case of disease changes the amount of them. Some of these substances are highly related to diseases like asthma, lung cancer, diabetes. In this research work, the detection and measurement of acetone in breath of diabetics is described using an ion mobility spectrometer with a corona-positive ionization source.
Methods: Instrumental parameters such as cell and injection temperatures, drift and corona voltages, carrier and drift gas flow rates, and pulse width were investigated. Under optimum conditions, calibration curve and other figures of merits were determined. Under optimum conditions, the breath of diabetics were sampled by syringe and then injected to IMS.
Results: Under optimum experimental conditions, the calibration curve was linear in the range of 10-80 ng. The relative standard deviation for 20 and 50 ng of acetone with 6 times the measurement were 7.2 and 6.2%, respectively. The limits of detection and quantification were 2.7 and 9 ng, respectively. The developed method has been used satisfactory to determine of acetone in the breath of diabetics.
