Objectives To investigate the correlation between dietary fatty acids intake of pregnant women and neonatal anthropometry at birth. Methods Women in early pregnancy were recruited with appropriate value of weight gain in pregnancy. Instant photography was used to assess the dietary situation in both the second trimester and the third trimester to calculate the intakes of food, energy, macronutrients, and fatty acids. The body weight, height and BMI at birth were evaluated with Z scores. The correlation between dietary fatty acids of pregnant women and neonatal anthropometry at birth were analyzed. Results There were 516 pregnant women recruited in this study. The average intakes of polyunsaturated fatty acids (PUFA) and the proportion of total fatty acids in the two trimesters were 15 . 09 g/d, 23 . 93% and 17 . 18 g/d, 24 . 86%. In the second trimester the intakes of n-6 and n-3 PUFA were 14 . 23 g/d and 3 . 45 g/d, and in the third trimester, n-6 and n-3 PUFA were 16 . 08 g/d and 3 . 81 g/d, the average intakes in the third trimester were signiifcantly higher than those in the second trimester (P??0 . 05 ). The intake of DHA ( 64 . 43 mg/d) in the second trimester was lower than that in the third trimester 75 . 12 mg/d, (P??0 . 05 ).The dietary intakes of n-3 PUFA, n-6 PUFA and n-6/n-3 ratio in the second trimester were positively correlated with neonatal BMI r=0 . 142~0 . 189 , P??0 . 05 ). Conclusions The dietary ratio of n-6/n-3 PUFA in the second trimester was positively correlated with neonatal BMI, suggesting that moderately increasing the intake of n-3 PUFA may play a positive role in reducing childhood obesity.

Objective To develop a HPLC-MS/MS method for the absolute bioavailability study of salidroside in Beagle dogs. Methods Gastrodin was used as internal standard. Plasma samples were treated by protein precipitation and separated by Symmetry RP₁₈ column (100 mm×4.6 mm, 3.5 μm). 0.1% formic acid in water(A) and 0.1% formic acid in acetonitrile: methanol (20 : 80, V/V) (B) were used as the mobile phase for isocratic elution with 35% mobile phase B. The flow rate was 0.4 ml/min. Column temperature was 40 ℃. Injection volume was 2 μl. By electrospray ionization source (ESI) and multi-reaction monitoring (MRM) mode, the MRM ion pairs of salidroside and gastrodin were identified as m/z 299.1→118.9 and m/z 285.1→122.9, separately. Blood samples were collected at different time points after oral or intravenous administration of salidroside. The harvested plasma samples were analyzed by HPLC-MS/MS method to assess the pharmacokinetics and absolute bioavailability of salidroside. Results Excellent linearity(r>0.998 6) was found in the concentration range of 10−10 000 ng/ml for salidroside and the lowest quantitative concentration was 10 ng/ml. The recovery was 89.5%−91.8%. The intra-day precision (RSD) was less than 9.7%, and the inter-day precision (RSD) was less than 7.3%. After a single oral dose of 15 mg/kg or an intravenous injection of 1.5 mg/kg of salidroside, c_max was (9 680±3725) and (9 310±1 645) ng/ml; t_max was (1.25±0.67) and (0.011±0.017) h, AUC_0−t was (20 535.4±5 200.0) and (4 646.7±720.5) ng·h/ml, AUC_0−∞ was (20 607.9±5 266.2) and (4 691.6±715.2) ng·h/ml; t_1/2 was (1.31±0.63) and (0.98±0.13) h, respectively. Conclusion The LC-MS/MS method established in this study was simple, rapid, sensitive and reliable. It meets the regulatory requirements of biological analysis for pharmacokinetic properties of salidroside in Beagle dogs. The absolute bioavailability of salidroside in Beagle dogs is (43.9±11.2)%.