Wei sheng yan jiu = Journal of hygiene research最新文献

Objective: To investigate the situation of women's dietary glycemic load during pregnancy and explore the correlations between dietary glycemic index(GI) and gestational weight gain and fetal physical development.

Methods: The study was conducted in women in the third trimester of pregnancy and their new-born babies. The gestational dietary information was collected through a 3-day 24-hour dietary review. The general demographic information, diet and physical exercise, and weight were collected in questionnaire investigations, and the glycemic load during pregnancy were calculated. Participant were dived into low-glycemic-load group, middle-glycemic-load group and high-glycemic-load group according to the glycemic load. Gestational weigh gain, birth weight and birth length were measured. Multiple linear regression were used to analyze the relationship between glycemic load during pregnancy and gestational weight gain and fetal growth.

Results: The mean gestational glycemic load was 149.21±46.33. Women in high-glycemic-load group had higher intake of grain, potato, bacteria and algae, fruit, poultry and dairy but lower intake of aquatic product(P<0.05). The mean gestational weight gain was(15.03±4.35)kg. The mean fetal weight and birth length was(3229.18±375.09)g and(49.60±1.48)cm. Women in high-glycemic-load group had higher gestational weight gain(P<0.05). Multiple linear regression indicated that dietary glycemic load during pregnancy was postively correlated with gestational weight gain and birth length(β_1=0.011, β=0.003, P<0.05).

Conclusion: The higher dietary glycemic load during pregnancy is, the higher gestational weight gain and birth length will be.

Objective: To explore the accuracy of a dietary recording tool based on the mobile phone WeChat applet-"Zhishi AI Dietitian" applied to dietary records.

Methods: The research subjects were 109 full-time undergraduates from Zhejiang University. Respondents completed one round of dietary records of "Zhishi AI Dietitian" for three non-consecutive days and one round of non-consecutive three-day 24-hour dietary review method records. The two method must overlap for one day. The energy, nutrients and various food intake data obtained from the Zhishi AI nutritionist survey were sorted and compared with the corresponding survey result of the 24-hour dietary review method. Pearson correlation coefficient or Spearman correlation coefficient was used for correlation analysis, intra-group correlation coefficient was used for reliability analysis, and Bland-Atlman scatter plot was used for consistency analysis.

Results: In terms of reliability, the two method had certain reliability in assessing intake of various foods, energy and nutrients. After energy correction, the reliability of nutrient intake was enhanced. In terms of correlation, the correlation coefficients of food groups ranged from 0.34 to 0.79(mean 0.60), and the energy and nutrient correlation coefficients ranged from 0.34 to 0.72(mean 0.55). In terms of consistency, the proportion of research subjects outside the 95% consistency interval is less than 10%, indicating that the two have good consistency.

Conclusion: Zhishi AI Dietitian applied to college students' dietary records has good accuracy.

Objective: To analyze the change of drinking water quality in the receiving area of Shijiazhuang South-to-North Water Transfer Project.

Methods: 2029 monitoring data of drinking water in the receiving areas of the South-to-North Water Transfer Project in Shijiazhuang from 2014 to 2021 were collected and collated according to the Sanitary Standard for Drinking Water(GB 5749-2006). Off-work water and pipe water before and after the total coliform group of South-to-North Water Transfer Project, heat-resistant coliform bacteria, escherichia coli, the total number of colonies, arsenic, cadmium, chromium, lead, mercury, nitrate, fluoride, selenium, cyanide, chloroform, carbon tetrachloride, chromaticity and turbidity, odor and taste, visible to the naked eye, pH, aluminum, iron, manganese, copper, zinc, chloride, sulfate, total soluble solids, total hardness, oxygen consumption, volatile phenols, anionic synthetic detergent, ammonia nitrogen, residual chlorine and chlorine dioxide were evaluated and compared. χ~2 test was used to compare the qualified rate, Mann-Whitney rank sum test was used to compare the test values of each index, and simple superposition comprehensive water environmental quality index method was used to evaluate the water quality comprehensively.

Results: Before the South-to-North Water Transfer Project, the total qualified rate of drinking water was 84.21%, that of factory water was 81.29%, and that of end water was 85.97%. The total qualified rate of drinking water after the South-to-North Water Transfer Project was 98.72%, that of factory water was 98.89%, and that of end water was 98.66%. The total qualified rate of water quality, the qualified rate of factory water and the qualified rate of end water after the South-to-North water transfer were higher than those before the transfer(P<0.05). The qualified rates of microbial indexes and total hardness of ex-factory water before the South-to-North Water Transfer Project were 94.37% and 89.94%, and those of microbial indexes and total hardness of end water were 94.32% and 93.35%, respectively. After the South-to-North Water Transfer, the qualified rates of microbial indexes and total hardness of the ex-factory water were 100.00% and 98.90%, and the qualified rates of microbial indexes and total hardness of the end water were 100.00% and 99.24%, respectively. After the South-to-North water transfer, the qualified rate of microbial indexes and total hardness of factory water and peripheral water were higher than those before the transfer(P<0.05). After the South-to-North Water Transfer, the M of total coliform group, total colony number, total hardness, fluoride, nitrate nitrogen, chloride, sulfate and dissolved total solids were lower than those before water transfer(For example, the median number of colonies and total hardness of factory water before the South-to-North Water Transfer were 20.00 CFU/100 mL and

Objective: To explore the effects of heat-inactivated Streptococcus thermophilus MN-ZLW-002(MN002) on glucose metabolism, lipid metabolism, gut microbiota and bile acids in high-fat diet fed obese mice.

Methods: Sixty 3-week-old male C57BL/6 mice were randomly divided into control group, high-fat group and intervention group(n=20). After 1 week of adaptive feeding, the control group was fed with normal chow and continued intragastric administration of normal saline for 12 weeks, the high-fat group was fed with high-fat diet and continued intragastric administration of normal saline for 12 weeks, and the intervention group was fed with high-fat diet and continued intragastric of MN002 for 12 weeks. During the experiment, the body weight, food intake, fasting blood glucose content of mice were measured and feces were collected. At the end of the experiment, the oral glucose tolerance of mice was measured and blood, periintestinal fat, peritestosterone fat and perirenal fat samples were collected. The histopathological changes of liver were observed by hematoxylin-eosin staining. Triglyceride, low density lipoprotein, high density lipoprotein and total cholesterol were detected by automatic biochemical analyzer, bile acids content in feces was detected by liquid chromatography-mass spectrometry, gut microbiota structure of mice was analyzed by 16S rDNA sequencing.

Results: Compared with high fat group, serum triglyceride, total cholesterol and perirenal fat in intervention group were significantly decreased(P<0.05), the content of fossil cholic acid sulfate in feces was significantly increased, while the content of ursodeoxycholic acid, porcine deoxycholic acid and deoxycholic acid were significantly decreased(P<0.01). Heat inactivation of MN002 could significantly increase the relative abundance of Ruminiclostridium and Alistipes and reduce the relative abundance of Lactobacillus(P<0.01).

Conclusion: Heat-inactivated Streptococcus thermophilus MN002 can regulate the gut microbiota structure and bile acid composition and content of high-fat diet fed mice, thereby alleviating the lipid metabolic disorders caused by high-fat diet.

Objective: To investigate the effect of aerobic exercise on AKT/GSK3β pathway-mediated hepatocyte apoptosis in non-alcoholic fatty liver diseases(NAFLD).

Methods: A total of 30 6-week-old male C57BL/6J mice, and mice were fed adaptively for one week. The control group was fed with ordinary diet, and the model group and model exercise group were fed with high-fat diet until 18 weeks. At the 10th week of the experiment, the model exercise group received aerobic exercise intervention for 8 consecutive weeks until the end of the experiment at the 18th week. Automatic biochemical analyzer to detect serum total cholesterol(TC), triglycerides(TG), alanine aminotransferase(ALT), aspartate aminotransferase(AST), low-density lipoprotein(LDL-C) and high-density lipoprotein(HDL-C) levels. Liver pathological morphology was observed by staining with oil red O and HE. The expression changes of AKT, P-AKT~( Ser473), GSK3β, P-GSK3β~(Ser9) and Caspase-3 proteins were detected by western blot, and the apoptosis of hepatocytes was detected by in situ terminal transferase labeling(TUNEL).

Results: (1) After intervention, compared with control group, body weight, liver index, serum TC, TG, ALT, AST and LDL-C levels in model group were significantly increased(P<0.01 or P<0.05), while HDL-C level was significantly decreased(P<0.01). Compared with model group, body weight, liver index, serum TC, TG, ALT, AST and LDL-C levels in model exercise group were significantly decreased(P<0.01 or P<0.05), while HDL-C level was significantly increased(P<0.01). (2) Compared with the control group, hepatocyte steatosis and the number of lipid droplets in model group were significantly increased. Compared with the model group, the degree of hepatic adipose degeneration was significantly improved and the number of hepatic lipid droplets was significantly decreased in the model exercise group. (3) Compared with control group, the protein expression levels of P-AKT~(Ser473) and P-GSK3β~(Ser9) in model group were significantly decreased(P<0.01 or P<0.05), the protein expression levels of Caspase-3 were significantly increased(P<0.05), and the number of hepatocyte apoptosis was significantly increased(P<0.05). Compared with model group, the expression of P-AKT~(Ser473) and P-GSK3β~(Ser9) protein in model exercise group was significantly increased(P<0.01 or P<0.05), the expression of Caspase-3 protein was significantly decreased(P<0.05), and the number of hepatocyte apoptosis was significantly decreased(P<0.01).

Conclusion: Aerobic exercise can effectively improve NAFLD, by activating AKT/GSK3β pathway and increasing the expression of AKT/GSK3β pathway related molecules, thereby reducing caspase-3 expression and hepatocyte apoptosis.

Objective: To study the expression of heat shock protein 27(HSP27), BAX and BCL-2 apoptosis in silicosis rat model, and to explore the correlation between HSP27 and BAX and BCL-2 apoptosis.

Methods: Silicosis model was established by the oropharyngeal and endotracheal intubation. Forty SPF healthy adult Wistar male rats were randomly divided into 4 groups, with 10 rats in each group. Silicosis group for 6 weeks(feeding for 6 weeks), silicosis group for 8 weeks(feeding for 8 weeks): oropharyngeal and tracheal perfusion of 50 mg/mL SiO_2 suspension 1.0 mL/mouse; Model control group for 6 weeks and model control group for 8 weeks: 1.0 mL saline was infused into the oropharynx and trachea. Immunohistochemical staining was used to detect the expression of HSP27, BAX and BCL-2 in the right lower lung of silicosis model group at 6 and 8 weeks and model control group at 6 and 8 weeks. Western blot was used to detect the protein expression of HSP27, BAX and BCL-2 in the left lower lobe lung tissue of silicosis model group at 6 and 8 weeks and model control group at 6 and 8 weeks, respectively. Immunofluorescence staining was used to detect the colocalization of HSP27 with pro-apoptotic factor BAX and HSP27 with anti-apoptotic factor BCL-2.

Results: Compared with the model control group at 6 weeks and 8 weeks, the expression of HSP27 and pro-apoptotic factor BAX in fibrotic region increased, and the expression of anti-apoptotic factor BCL-2 decreased in silicosis model group at 6 weeks and 8 weeks(P<0.05). Immunofluorescence staining showed that there was colocalization of HSP27 and pro-apoptotic factor BAX in the fibrotic region. Correlation analysis showed that the correlation coefficient between HSP27 and pro-apoptotic factor BAX was r=0.94, indicating a positive correlation between them, while the correlation coefficient between HSP27 and anti-apoptotic factor BCL-2 was r=-0.81, indicating a negative correlation between them.

Conclusion: High expression of HSP27 and pro-apoptotic factor BAX and low expression of anti-apoptotic factor BCL-2 exist in silicosis rats, and their expression is correlated.

Objective: To develop a polymerase chain reaction(PCR) method for rapid detection of Listeria monocytogenes in oysters without pre-enrichment.

Methods: The combination of β-cyclodextrin and bentonite-coated activated carbon was used to remove PCR inhibitors from oyster samples, and the target gene inlB was used for the PCR subsequently. The specificity, sensitivity, and application of the developed method were verified, and the stability and application of the reagents stored under cryopreservation conditions were evaluated.

Results: The specificity of the developed PCR method was 100% for the detection of 130 target bacterial strains and 63 non-target bacterial strains. The method reduced the time required for Listeria monocytogenes detection to 4 h without pre-enrichment, and the detection limit was 10 CFU/25 g. The method was consistent with the conventional culture method on the detection rate and viable bacteria detection rate of Listeria monocytogenes in natural oyster samples(the coincidence rate was 100%). Additionally, the reagents could be used normally after storing at-20 ℃ for at least one year.

Conclusion: The PCR method developed in this study has high specificity and sensitivity, and can be used for rapid, accurate detection of Listeria monocytogenes in oysters.

Objective: To develop a prediction equation for estimation physical activity level(PAL) based on the average daily steps in Chinese adults and to verify its prediction power.

Methods: A total of 800 adults with no restriction on physical activity were recruited. Excluding those who wore Actigragh WGT3X-BT accelerometer continuously for less than 3 days, 743 subjects(324 males, 419 females, mean age 31.4 years) were finally included. Daily steps, time of low intensity physical activity(LPA), moderate physical activity(MPA) and vigorous physical activity(VPA) and physical activity energy expenditure(PAEE) were measured by the accelerometer. The method of external validation was adopted. The measured PAL calculated by basal metabolic rate(BMR) measured by indirect thermography(IC) and total energy expenditure(TEE) measured by doubly labeled water method was used as the gold standard. The consistency of the prediction formula was verified by Bland-Altman analysis and the accuracy was verified by the accurate.

Results: The prediction equation was developed: PAL=1.17 + 0.000028 Steps. In the external verification, the mean difference was 0.05, the 95% consistency limit was(-0.26, 0.36), and the accuracy was 73%, indicating a good consistency.

Conclusion: The prediction formula of PAL for Chinese adults based on the steps has good performance and can be applied to the management of physical activity and the prevention of obesity in Chinese adults.

Objective: To explore the dose-effect and mechanism of the protective effect of corn peptide(CP) on nonalcoholic fatty liver disease(NAFLD).

Methods: Seventy male SD rats were randomly divided into control group, model group, CP group, puerarin positive control group, low-, medium-, high-dose corn peptide group, the experiment started after 1 week of adaptive feeding. The control group and CP group were fed with ordinary feed and others were fed with high-fat feed, while the control group was given intragastric administration of purified water, the CP group and the low-, medium-, high-dose corn peptide group were given intragastric administration of corn peptide(800, 400, 600 and 800 mg/(kg·d), respectively), and the puerarin positive control group was given intragastric administration of 300 mg/(kg·d) of puerarin, for 10 weeks. The body weight and general condition of rats were recorded every week, after 10 weeks, the indexes of 7 groups were compared.

Results: Compared with the model group, the liver index(3.67, 3.29, 3.19 and 3.04, P<0.05) of the rats in the three doses of corn peptide groups decreased. The homeostasis model assessment of insulin resistance(13.66, 11.82, 11.55 and 10.53, P<0.05) decreased. The serum triglyceride(TG)(0.59, 0.42, 0.34 and 0.28, P<0.05), total cholesterol(TC)(2.57, 2.10, 1.67 and 1.46, P<0.05), free fatty acid(FFA)(0.66, 0.44, 0.40 and 0.36, P<0.05), and leptin(10.64, 9.87, 9.43 and 9.05, P<0.05) decreased. The serum interleukin-6(74.61, 61.66, 51.12 and 35.68, P<0.05) and tumor necrosis factor-α(100.18, 74.13, 67.44 and 48.46, P<0.05) decreased. The serum aspartate aminotransferase(41.38, 19.41, 14.98 and 8.44, P<0.05) and alanine aminotransferase(25.14, 13.10, 11.57 and 7.48, P<0.05) activity decreased. The liver TG(9.89, 5.55, 4.73 and 3.13, P<0.05), TC(1.73, 0.97, 0.80 and 0.50, P<0.05) and FFA(1.81, 1.11, 0.77 and 0.70, P<0.05) decreased. The serum malondialdehyde(MDA)(21.36, 15.24, 12.75 and 10.87, P<0.05) level and liver MDA(11.87, 8.27, 6.33 and 4.98, P<0.05) level decreased. The serum and liver superoxide dismutase and glutathione peroxidase activity increased(P<0.05), and the effect is related to the intervention dose of corn peptide. The size of the liver became smaller, the liver color gradually changed from light yellow to light red.

Conclusion: Corn peptide has a certain preventive effect on NAFLD in rats, and the preventive effect of corn peptide is related to its intervention dose.

Objective: To establish a method for determination of amantadine, rimantadine and dimethylamantadine residues in poultry matrix by ultra-performance liquid chromatography-tandem mass spectrometry.

Methods: Poultry samples were extracted with acid acetonitrile, salting out, and then the organic phase was cleaned up by C_(18) and PSA. A Waters ACQUITYTM UPLC HSS T3 column(100 mm×2.1 mm, 1.7 mm)was used for liquid chromatography separation, ESI positive ion scan was used with multiple reaction monitoring(MRM) mode and quantified by matrix-matched external standard method.

Results: At the spiked level of 0.5, 1.0 and 5.0 μg/kg, the recoveries of each compound were in the range of 81.3%-91.1% with the relative standard deviations of 6.5%-11.3%. The qualitative limits of detections were 0.06-0.2 μg/kg and the quantitative limits were 0.2-0.5 μg/kg for the 3 target compounds. The established method was applied to the detection of the 3 target compounds in 30 poultry samples, and none of the target compounds exceeded the residue limits.

Conclusion: The method is simple, rapid, high sensitivity and good stability, with a wide variety and a certain development. It can be used for the daily monitoring of the veterinary drug residues in poultry.