Objective: To explore the correlation between dietary N-glycolylneuraminic acid (Neu5Gc) intake and chronic inflammation state of body. Methods: A total of 306 samples of 102 types of food were purchased from a supermarket in Xiamen in September 2019, including grains, meat, poultry, seafood, eggs, beans, dairy products, vegetables and fruits. The content of Neu5Gc in food was determined by liquid chromatography-mass spectrometry. A total of 500 healthy freshmen from Xiamen University were selected by using a simple random sampling method. The food frequency questionnaire was used to investigate the food intake in the past year. The food intake was corrected by 3 consecutive 24-hour recalls, and the amount of Neu5Gc intake was calculated. The concentration of anti-Neu5Gc antibody, C-reactive protein (CRP) and interleukin-6 (IL-6) in serum was detected. Spearman correlation analysis was used to explore the correlation between Neu5Gc intake and anti-Neu5Gc antibody, CRP and IL-6 levels. Results: Neu5Gc was mainly found in red meat and liquid dairy products. The contents of Neu5Gc in beef, lamb and pork were (30.32±2.84), (20.39±4.73) and (5.58±1.04) mg/kg, respectively, and in liquid milk and yogurt were (10.87±1.54) and (6.91±0.24) mg/L, respectively. The M (P25, P75) intake of Neu5Gc for all participants was 4.62 (2.20, 8.60) mg/d. The M(P25, P75) intake of Neu5Gc for males about 6.60(2.83, 10.20) was higher than that for females about [3.84 (1.84, 6.35) mg/d] (P<0.001). The M (P25, P75) of serum anti-Neu5Gc, CRP and IL-6 levels were 3.07 (2.17, 4.14) μg/ml, 0.37 (0.22, 0.87) mg/ml and 61.82 (12.23, 315.30) pg/ml, respectively. Spearman correlation analysis showed that the intake level of Neu5Gc was positively correlated with serum anti-Neu5Gc antibody, CRP and IL-6 levels, with rs values about 0.222, 0.102 and 0.126, respectively (all P values <0.05). Conclusion: Dietary Neu5Gc intake is mainly from red meat and liquid dairy products, and its intake level is positively correlated with chronic inflammatory state of body.
目的： 探讨膳食N-羟乙酰神经氨酸（Neu5Gc）摄入水平与机体慢性炎症状态的关系。 方法： 所有食物样品均于2019年9月购自厦门某超市，包括谷物、肉类、家禽、海鲜、鸡蛋、豆类、乳制品、蔬菜和水果等，共计102种306份，采用液相色谱-质谱联用法测定食物Neu5Gc含量。采用简单随机抽样抽取厦门大学健康入学新生500名，采用食物频率调查表调查研究对象过去1年内食物摄入情况，采用连续3 d 24 h回顾法校正食用量，计算对象的Neu5Gc摄入量。检测血清抗-Neu5Gc抗体、C反应蛋白（CRP）和白细胞介素-6（IL-6）水平。采用Spearman相关分析探索Neu5Gc摄入量与抗-Neu5Gc抗体以及CRP和IL-6等指标的相关性。 结果： Neu5Gc主要存在于红肉和液态乳制品，在牛、羊和猪肉中的含量分别为（30.32±2.84）、（20.39±4.73）和（5.58±1.04）mg/kg，在液态牛奶和酸奶中的含量分别为（10.87±1.54）和（6.91±0.24）mg/L。Neu5Gc摄入量的M（P25，P75）为4.62（2.20，8.60）mg/d，其中男生为6.60（2.83，10.20）mg/d，高于女生[3.84（1.84，6.35） mg/d]（P<0.001）。血清抗-Neu5Gc、CRP和IL-6水平的M（P25，P75）分别为3.07（2.17，4.14）μg/ml，0.37（0.22，0.87）mg/ml和61.82（12.23，315.30）pg/ml。Neu5Gc摄入水平与血清抗-Neu5Gc抗体、CRP和IL-6水平均呈正相关，rs值分别为0.222、0.102和0.126，P值均<0.05。 结论： 膳食Neu5Gc摄入主要来自红肉和液态乳制品，其摄入水平与机体慢性炎症状态呈正相关。.
Keywords: Cross-sectional studies; Diet; Inflammation; Sialic acids.