ABSTRACT
Panax ginseng, a perennial herb, is prone to diseases and insect pests in the growth process, which are primarily prevented and treated by pesticides. However, due to the lack of standardization in the types, frequencies, and doses of pesticides, pesticide residues have become the main exogenous pollutants of P. ginseng. To explore the risk of pesticide residues in P. ginseng, this paper summarized and analyzed the common pesticide residues in P. ginseng, detection techniques, and pesticide residue limit stan-dards based on the published literature in recent years. The results revealed that the main pesticide residues in P. ginseng were organochlorine pesticides, such as tetrachloronitrobenzene, pentachloronitrobenzene, and hexachlorobenzene, and the detection techniques were dominated by gas chromatography(GC), liquid chromatography(LC), or those combined with mass spectrometry(MS). Because of the long half-life and difficulty in degradation, organochlorine pesticides have become the main factor affecting the export of P. ginseng. It is worth mentioning that P. ginseng has been classified as food in Japan, South Korea, the European Union, and other countries, and the standards of pesticide residues and limits are stricter than those in China. The quality and safety of P. ginseng are prerequisites for the efficacy of Chinese medicine and the development of traditional Chinese medicine. The formulation of scientific and effective standards for pesticide application and limits would promote the high-quality development of the P. ginseng industry.
Subject(s)
Gas Chromatography-Mass Spectrometry , Hydrocarbons, Chlorinated/analysis , Panax/chemistry , Pesticide Residues/analysis , Pesticides/analysisABSTRACT
This study aims to investigate the effects of different magnesium supply levels on the growth, nutrient absorption and distribution, and quality of Panax quinquefolium, and to determine the optimum content of exchangeable magnesium in soil. Three-year-old plants of P. quinquefolium were used in this study, and eight magnesium supply gradients(CK, Mg1-Mg7) were designed for indoor pot experiment(cultivation in soil). The plant growth indexes, nutrient element content in soil and plant, and root saponin content were determined at the end of the growth period. The correlation analysis of nutrient element content in aboveground and underground parts of P. quinquefolium showed significantly negative correlations of magnesium-calcium, magnesium-potassium, and magne-sium-manganese. With the increase in magnesium supply level, the biological absorption coefficient of magnesium increased, while that of total nitrogen, potassium, iron, and manganese decreased; the biological transfer coefficient of magnesium decreased, while that of nitrogen, phosphorus, calcium, iron, and manganese increased. The saponin content was analyzed by principal component analysis, which showed the comprehensive score in the order of Mg4(2.537), Mg2(1.001), Mg3(0.600), Mg1(0), Mg7(-0.765), CK(-0.825), Mg6(-0.922), and Mg5(-1.663). The partial least squares-path modeling(PLS-PM) showed that the correlation coefficients of exchangeable magnesium and pH with quality were-0.748 and-0.755, respectively, which were significant. Magnesium-calcium, magnesium-potassium, and magnesium-manganese showed antagonism in the nutritional physiology of P. quinquefolium. Excessive application of magnesium can lead to the imbalance of nutrient elements in P. quinquefolium. The content of exchangeable magnesium in soil suitable for the quality formation of P. quinquefolium was 193.34-293.34 mg·kg~(-1). In addition to exchangeable magnesium, pH was also important to the quality formation of P. quinquefolium. Therefore, exchangeable magnesium and pH could be regarded as monitoring factors for the quality formation of P. quinquefolium.
Subject(s)
Magnesium , Nutrients , Panax/chemistry , Phosphorus , Soil/chemistryABSTRACT
Objective To investigate the awareness rate,treatment rate and control rate of mineral and bone disorder in patients with moderate or advanced stage chronic kidney disease (CKD). Methods The awareness rate,treatment rate and control rate of mineral and bone disorder were evaluated based on a questionnaire and related laboratory examinations in 503 CKD stage 3 to 5 patients. Results The awareness rate of mineral and bone disorder in patients with moderate or advanced stage CKD was highest in hemodialysis patients,moderate in peritoneal dialysis patients and lowest in non-dialyzed patients (all P ＜0.01).The total scores of the questionnaire were lowest in non-dialyzed patients [6 (5,8)] and were significantly higher in peritoneal dialysis [11 (9,12)] and hemodialysis patients [13 (11,15)] (P＜0.01).The extent of awareness was negatively correlated with age (r=-0.11,P＜0.05),and positively correlated with educational background (r=0.226,P＜0.01),duration of CKD (r=0.597,P＜0.01) and duration of dialysis (r=0.366,P＜0.01).The source of knowledge was mainly from publicity and education made by medical staff,which accounted for 94.0％,79.5％ and 69.4％ respectively in nondialyzed,peritoneal dialysis and hemodialysis patients.The treatment rate was significantly higher in peritoneal dialysis (88.6％) and hemodialysis patients (96.9％) than that in non-dialyzed patients (58.2％) (all P＜0.01).According to K/DOQI guideline,the control rate of serum calcium,phosphorus,calcium and phosphorus product and parathyroid hormone (PTH) were much better in non-dialyzed patients as compared to dialyzed ones.The percentage of number of lab indicators meeting the standard was significantly higher in non-dialyzed patients as compared to dialyzed ones (P＜0.01).According to KDIGO guideline,the control rate of serum phosphorus was significantly lower in hemodialysis patients (23.6％) than that in peritoneal dialysis (36.9％) and non-dialyzed patients (46.7％) (P＜0.01). Conclusions In non-dialyzed patients with moderate or advanced stage CKD,the awareness rate and treatment rate of mineral and bone disorder are relatively low,and the control rate is relatively high.Whereas in dialyzed patients,the awareness rate and treatment rate are relatively high,and the control rate is relatively low.
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Objective To evaluate the solute clearance characteristics of REXEEDTM series dialyzers during high-flux dialysis, and explore the care characteristics. Methods A randomized crossover study of 3×3 Latin square was designed based on different dialyzers. Eighteen patients with regular hemodialysis underwent dialysis with REXEEDTM-15AC dialyzer, REXEEDTM-15UC dialyzer and controlled APS-15U dialyzer, respectively. Blood samples were obtained from the blood flow entrance and exit of dialyzers, levels of urea nitrogen, creatinine, phosphate and β2-microglobulin were detected, and solute clearance rates were calculated. Before and after the third dialysis with each dialyzer, blood samples were obtained to measure the levels of urea nitrogen and creatinine, and the rates of decrease were calculated. The vital signs of each patient were intensively observed, and the venous pressure and transmembrane pressure were monitored from the dialyzers. Results The urea nitrogen clearance rates of REXEEDTM-15AC dialyzer and REXEEDTM-15UC dialyzer were significantly higher than that of APS-15U dialyzer (P<0.05). The creatinine clearance rate of REXEEDTM-15AC dialyzer was significantly higher than that of APS-15U dialyzer(P<0.05). There was no significant difference in the rate of decrease in blood urea nitrogen among different dialyzers of the same patient(>65 % for all patients). The vital signs were stable with no adverse events during dialysis, and there was no abnormal findings in laboratory security parameters. Conclusion REXEEDTM series dialyzers are effective and safe for clinical application. Great importance should be attached to the complaints from patients during dialysis. For those with less ultrafiltration, fluid as well as uhrafiltration should be supplemented to increase the transmembrane pressure.
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Continuous exposure to conventional glucose-containing lactate-buffered solutions will ultimately lead to irreversible changes of the structure and function of peritoneum.Therefore,the development of novel peritoneal dialysis(PD) solutions has become the focus in the PD fields in recent years.Icodextrin,which has more adventages than conventional PD solutions,is one of the most important advancements in the past decade.Icodextrin has better biocompatibility,and can reduce the absorption of carbohydrates to decrease the metabolic complications in PD patients.Apart from increasing ultrafiltration,icodextrin can also improve the fluid status and protect the residual renal function of PD patients.However,adverse consequences may result from the pseudo-hyperglycaemia caused by limited measurement of serum glucose.This article reviews the features and applications of the new PD solutions—icodextrin solutions.
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Objective To elucidate the effects of eicosapentaenoic acid(EPA)on the metabolic abnormalities and renal pathologic changes during the early stage of diabetic nephropathy in KKAy/Ta mice.Methods Sixteen KKAy/Ta mice(7 weeks of age)were randomly divided into two groups(n=8).Since 12 weeks of age,EPA group were injected with EPA at 1 g?kg-1?d-1 intraperitoneally for 8 weeks,and the control group were injected with 0.9% saline.The levels of serum fatty acids were detected at 20 weeks of age by gas chromatography.The phenotypic characterizations were measured at 12,16 and 20 weeks of age.Renal morphological examinations were performed after 8 weeks of treatment.Results Serum EPA levels in KKAy/Ta mice treated with EPA [(125.8?15.5)?g/mL] were significantly higher than those in control group [(69.2?7.8)?g/mL] at 20 weeks of age(P
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Objective To investigate the morphological and functional alterations of peritoneum in uremic rats undergoing peritoneal dialysis(PD). Methods Thirty-five male Wistar rats were randomly divided into control group(sham operated group,n=6),uremia group(5/6 nephrectomy,n=6) and uremia with PD group(n=18).Uremia with PD group was subdivided into three subgroups according to different dialysis period(10 d,4 weeks and 8 weeks,n=6).Omenta were obtained for morphological examination,and peritoneal equilibration tests(PET) were performed to assess the transport function of peritoneal membrane. Results The number of blood vessels per high-power field in the uremia group,uremia with PD group and uremia with PD subgroups(5?3,10?5,17?5 and 19?4) were significantly increased compared with the control group(1?1),and that was much bigger in the uremia with PD group than the uremia group(P
ABSTRACT
<p><b>BACKGROUND</b>Long-term peritoneal dialysis (PD) requires that the peritoneal membrane remain effective for dialysis. Research directed toward human peritoneal morphology and structure is limited. The present study was performed to investigate morphological changes of the human peritoneal membrane during PD and to elucidate the possible mechanisms of its functional deterioration.</p><p><b>METHODS</b>A total of 32 peritoneal biopsies were performed in normal subjects (n = 10), uremic nondialysis patients (n = 12) at the time of catheter insertion, and PD patients (n = 10) at the time of catheter removal or reinsertion or at the time of renal transplantation. Peritoneal morphology was examined by light microscopy, scanning electron microscopy, and transmission electron microscopy.</p><p><b>RESULTS</b>The peritoneal membrane in normal subjects consisted of a monolayer of mesothelial cells on a basement membrane and a layer of connective tissue containing cells, blood vessels, and lymphatic vessels. Mesothelial cells were polygonal, often elongated, and had numerous microvilli on their luminal surface. There were lots of oval or roundish pinocytotic vesicles in the cytoplasm of the mesothelial cells. The peritoneal morphology of uremic nondialysis patients was similar to that of normal subjects. However, significant abnormalities of the peritoneal membrane were observed in PD patients, and the changes were found to be progressive. Microvilli were the first site of damage which involved microvilli shortening, a gradual reduction in their number, and, eventually, the total disappearance of microvilli. Mesothelial cells then detached from the basement membrane, disappearing completely in some cases. In the end, the peritoneal membrane consisted only of submesothelial connective tissue without any cells.</p><p><b>CONCLUSIONS</b>PD can modify peritoneal morphology and structure. The morphological change is progressive and may be one of the important causes of peritoneal failure. Peritoneal biopsies can provide lots of valuable information about the effects of PD. Studying the relationship between peritoneal structure and its function proved very useful for understanding the physiopathology of the peritoneum during PD.</p>
Subject(s)
Adult , Female , Humans , Male , Middle Aged , Peritoneal Dialysis , Peritoneum , PathologyABSTRACT
Objective To investigate the mechanism of high-glucose-induced injury to human peritoneal mesothelial cells(HPMC). Methods (1)The cultured HPMCs were exposed to culture medium containing different concentrations of glucose(1. 5% , 2. 5% , 4. 25% )for 48 hours and 4. 25% mannitol and normal culture medium were as control. Then apoptosis was observed by flow cytometry and caspase-3 activity was measured by ApoAlert?CPP33/Caspase-3 Assay kits. (2) The cultured HPMCs were exposed to 4.25% glucose culture medium containing different concentrations of caspases inhibitor, Z-VAD. fmk (25, 50, 100 ?mol/L) for 48 hours and 4. 25% glucose culture medium containing DMSO was as control. Then apoptosis was observed by flow cytometry and caspase-3 activity was measured by ApoAlert?CPP33/ Caspase-3 Assay kits as well. Results (1) Glucose increased caspase-3 activity in a concentration-dependent manner. Compared to control, caspase-3 activity was significantly higher in 4. 25% glucose group and 2. 5% glucose group, but not significantly different in 1. 5% glucose group and 4. 25% mannitol group. (2) Apoptotic rate of HPMC was significantly lower in Z-VAD. fmk group than that in control. Z-VAD. fmk decreased the number of apoptotic cells in a concentration-dependent manner. Also, caspase-3 activity of HPMC was significantly lower in Z-VAD. fmk group than that in control. Conclutions (1) High-glucose can induce apoptosis and caspase-3 activation of HPMC in a dose-dependent manner. (2) Z-VAD. fmk inhibits high glucose-induced apoptosis of HPMC in a dose-dependent manner. (3)High glucose induces apoptosis of human peritoneal mesothelial cells by caspase-3 activation.