Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 20 de 26
Filter
1.
Article in English | WPRIM | ID: wpr-875520

ABSTRACT

To date, there is no report on the genetic diversity of ticks in these regions. A total of 370 representative ticks from the south and east regions of Kazakhstan (SERK) and Xinjiang Uygur Autonomous Region (XUAR) were selected for molecular comparison. A fragment of the mitochondrial cytochrome c oxidase subunit I (cox1) gene, ranging from 631 bp to 889 bp, was used to analyze genetic diversity among these ticks. Phylogenetic analyses indicated 7 tick species including Hyalomma asiaticum, Hyalomma detritum, Hyalomma anatolicum, Dermacentor marginatus, Rhipicephalus sanguineus, Rhipicephalus turanicus and Haemaphysalis erinacei from the SERK clustered together with conspecific ticks from the XUAR. The network diagram of haplotypes showed that i) Hy. asiaticum from Almaty and Kyzylorda Oblasts together with that from Yuli County of XUAR constituted haplogroup H-2, and the lineage from Chimkent City of South Kazakhstan was newly evolved; and ii) the R. turanicus ticks sampled in Israel, Almaty, South Kazakhstan, Usu City, Ulugqat and Baicheng Counties of XUAR were derivated from an old lineage in Alataw City of XUAR. These findings indicate that: i) Hy. asiaticum, R. turanicus and Ha. erinacei shared genetic similarities between the SERK and XUAR; and ii) Hy. marginatum and D. reticulatus show differences in their evolution.

2.
Chinese Journal of Endemiology ; (12): 947-950, 2019.
Article in Chinese | WPRIM | ID: wpr-824084

ABSTRACT

Objective To carry out a investigation on molecular epidemiological features of tick-borne Brucella in Xinjiang Uygur Autonomous Region (Xinjiang), and to provide a scientific basis for formulation of effective preventive and control measures. Methods In 2016 - 2018, parasitic ticks (including engorged females) were collected on the body surface of livestock in 10 counties (cities) along the border of Xinjiang. The free-living ticks were collected by flagging method in Alashankou. The engorged female was placed in a breathable insect tube for spawning, each egg batch was divided into two parts: one part was tick eggs, while the second part was allowed further larval development. All ticks were identified by molecular biology (16S rRNA) identification. Tick DNA was extracted, PCR was performed based on Brucella omp22 and IS711, and amplification products were sequenced and analyzed by BLAST. Results A total of 1084 ticks were collected in 11 counties (cities), of them 747 were parasitic ticks (including 34 engorged females) and 337 were free-living ticks. Based on 16S rRNA identification, 1084 ticks belonged to 4 genera and 5 species, and the proportions of Dermacentor nuttalli, Dermacentor marginatus, Haemaphysalis punctata, Hyalomma asiaticum and Rhipicephalus turanicus were 29.43% (319/1084), 16.51% (179/1084), 10.42%(113/1084), 37.27% (404/1084), and 6.37% (69/1084), respectively. A total of 214 Brucella-positive nucleic acid samples were detected, the positive rate was 19.74%. The parasitic ticks' positive rate was 25.30% (189/747), and the free-living ticks' positive rate was 7.42% (25/337), parasitic ticks' positive rate was higher than that of free-living ticks (χ2 = 46.873, P < 0.05). Two Brucella melitensis nucleic acid samples were detected in 34 "engorged females-tick eggs" developmental stage, and one Brucella melitensis nucleic acid sample was detected in 22 "tick eggs-larvae" developmental stage. Conclusions Brucella is widely distributed in parasitic ticks and free-living ticks in Xinjiang border areas, and the parasitic ticks' positive rate is obviously higher than that of free-living ticks. The Brucella melitensis has potential transovarian transmission and transstadial transmission in ticks. In the prevention and control of livestock brucellosis, the work of killing ticks should be strengthened, including parasitic ticks on the body surface and free-living ticks in the environment.

3.
Chinese Journal of Endemiology ; (12): 947-950, 2019.
Article in Chinese | WPRIM | ID: wpr-800057

ABSTRACT

Objective@#To carry out a investigation on molecular epidemiological features of tick-borne Brucella in Xinjiang Uygur Autonomous Region (Xinjiang), and to provide a scientific basis for formulation of effective preventive and control measures.@*Methods@#In 2016-2018, parasitic ticks (including engorged females) were collected on the body surface of livestock in 10 counties (cities) along the border of Xinjiang. The free-living ticks were collected by flagging method in Alashankou. The engorged female was placed in a breathable insect tube for spawning, each egg batch was divided into two parts: one part was tick eggs, while the second part was allowed further larval development. All ticks were identified by molecular biology (16S rRNA) identification. Tick DNA was extracted, PCR was performed based on Brucella omp22 and IS711, and amplification products were sequenced and analyzed by BLAST.@*Results@#A total of 1 084 ticks were collected in 11 counties (cities), of them 747 were parasitic ticks (including 34 engorged females) and 337 were free-living ticks. Based on 16S rRNA identification, 1 084 ticks belonged to 4 genera and 5 species, and the proportions of Dermacentor nuttalli, Dermacentor marginatus, Haemaphysalis punctata, Hyalomma asiaticum and Rhipicephalus turanicus were 29.43% (319/1 084), 16.51% (179/1 084), 10.42%(113/1 084), 37.27% (404/1 084), and 6.37% (69/1 084), respectively. A total of 214 Brucella-positive nucleic acid samples were detected, the positive rate was 19.74%. The parasitic ticks' positive rate was 25.30% (189/747), and the free-living ticks' positive rate was 7.42% (25/337), parasitic ticks' positive rate was higher than that of free-living ticks (χ2=46.873, P < 0.05). Two Brucella melitensis nucleic acid samples were detected in 34 "engorged females-tick eggs" developmental stage, and one Brucella melitensis nucleic acid sample was detected in 22 "tick eggs-larvae" developmental stage.@*Conclusions@#Brucella is widely distributed in parasitic ticks and free-living ticks in Xinjiang border areas, and the parasitic ticks' positive rate is obviously higher than that of free-living ticks. The Brucella melitensis has potential transovarian transmission and transstadial transmission in ticks. In the prevention and control of livestock brucellosis, the work of killing ticks should be strengthened, including parasitic ticks on the body surface and free-living ticks in the environment.

4.
Article in Chinese | WPRIM | ID: wpr-616095

ABSTRACT

Objective To investigate the effect of continue nursing care post-discharge on the treatment effectiveness of gastric ulcer in active phase, and to facilitate the nursing quality. Methods A total of 163 patients with gastric ulcer were divided into control group including 80 cases and observation group including 83 cases randomly by hospitalization order. Routine nursing care was administrated on the two groups of patient's duration of hospital stay equally, but continue nursing care was administrated on the observation group patients exceptionally. The treatment outcome and intervention effect of the two groups were compared at the end of study. Results The overall cure rates of the control the observation group patients were 63.75%(30/80) and 81.93%(68/83), the eradication rates of helicobacter pylori (Hp) were 86.25%(69/80) and 96.39%(80/83), the medication compliance scores of Morisky were 3.69 ± 1.34 and 6.71 ± 1.57, the quality scores of life instruments for chronic were 67.81 ± 7.10 and 86.34 ± 6.83 respectively at the end of follow-up period. There were significant differences in the above indicators (χ2=6.830,5.330,t=13.199,16.977,P<0.05 or 0.01). Kaplan-Meier analysis showed that the cure period of the observation group was significantly shorter than that of the control group (χ2=20.446,P<0.05). Conclusions The continue nursing care post-discharge has positive effect on the treatment of active gastric ulcer, and it should be recommended in clinical application.

5.
Chongqing Medicine ; (36): 1619-1620,1623, 2017.
Article in Chinese | WPRIM | ID: wpr-606570

ABSTRACT

Objective To explore the clinical value of transgastric natural orifice transluminal endoscopic surgery(NOTES)in diagnosing unexplained ascites.Methods The clinical data in 12 cases of unexplained ascites diagnosed by adopting transgastric approach NOTES and performed abdominal exploration and peritoneal biopsy in our hospital from November 2015 to July 2016 were retrospectively analyzed.The operative risk and clinical application value were evaluated by statistically analyzing the postoperative complications occurrence and the diagnosis rate of disease.Results The definite diagnosis rate reached 100% verified by pathology after abdominal exploration and peritoneal biopsy,in which 8 cases(66.7%)were tuberculous peritonitis,2 cases(16.7%)were liver cirrhosis,1 case(8.3%)was peritoneal mesothelioma,1 cases(8.3%)was peritoneal metastatic carcinoma;2 cases appeared abdominal pain after operation,including 1 case of neutrophil ratio increase,symptoms and persistent time of abnormal laboratory indexes did not exceed 24 h,the incidence rate was 8.3%;no complications of abdominal cavity infection,incision bleeding and puncture site fistula occurred.Conclusion The transgastric NOTES for conducting abdominal exploration and peritoneal biopsy in the diagnosis of unexplained ascites has the advantages of small trauma,less complications and rapid postoperative recovery,possesses an important clinical application value.

6.
Article in Chinese | WPRIM | ID: wpr-506327

ABSTRACT

Mycotoxins,secondary metabolites produced by certain fungi,have become one of the most harmful factors that affect the clinical safety of medicinal herbs that probably can be contaminated by harmful toxins generated from fungi in the whole process from planting to clinical use. Therefore,more toxicological research of mycotoxins,a better knowledge of the pathogenesis and quick detection with sensitivity and accuracy will play an important role in targeted therapy of poisoning by mycotoxins and early warning . In this paper,the current status of mycotoxin contamination in medicinal herbs was ana?lyzed,and the progress of toxicological study on common contaminants was reviewed. In view of the high toxicity of toxins,the strategy of ″Prevention First″ is highly desirable. Hence,the development of rapid detection of typical mycotoxins was systematically discussed. The review was intended to provide ref?erence for ensuring clinical safe administration of medicinal herbs and for reducing the risk of mycotoxin poisoning.

7.
Acta Pharmaceutica Sinica ; (12): 110-5, 2016.
Article in Chinese | WPRIM | ID: wpr-505099

ABSTRACT

A suitable ultra-high performance liquid chromatography coupled with tandem mass spectrometry (UPLC-MS/MS) method was developed for the determination of 11 mycotoxins with isotope internal standard in malt. The mycotoxins in malt were extracted and purified by one-step ultrasonic extraction procedure using acetonitrile/water/acetic acid (80 : 19 : 1), and then detected and confirmed by UPLC-MS/MS, and quantified by isotope labeled AFB1 ([13C17]-AFB1) and ZEN ([13C18]-ZEN) internal standards. Rapid separation of the 11 mycotoxins was successfully achieved on a Phenomenex Kinetex C18 column (100 mm x 2.1 mm, 2.6 μm) with gradient elution using the mobile phase of methanol containing 0.1% formic acid and 2 mmol x L(-1) ammonium acetate in water. Simultaneous acquisition was performed in multiple reaction monitoring (MRM) mode with electrospray ionization (ESI) source operated in both positive and negative ionization modes. The established method provided a good linearity for the 11 mycotoxins within their respective linear ranges with correlation coefficients all higher than 0.999 1. The average recoveries ranged from 75.0% to 117.0% with relative standard deviations (RSDs) below 5.1%. The limits of detection (LODs) and quantitation (LOQs) ranged from 0.05 to 30 μg x kg(-1) and 0.15 to 87.5 μg x kg(-1), respectively, which were below the maximum residue levels (MRLs) set by the European Union. Twenty malt samples were analyzed and nine samples were detected with mycotoxins, which were confirmed according to the same fragment ions found in positive samples and the standards at the same retention time. This study has demonstrated that the one-step extraction procedure of mycotoxins from complex matrices coupled to UPLC-MS/MS method is simple, quick, accurate and sensitive for quantitative and qualitative analysis of multiple mycotoxins in malt.

8.
Acta Pharmaceutica Sinica B ; (6): 38-46, 2015.
Article in English | WPRIM | ID: wpr-329696

ABSTRACT

The safety of traditional Chinese medicine (TCM) is a major strategic issue that involves human health. With the continuous improvement in disease prevention and treatment, the export of TCM and its related products has increased dramatically in China. However, the frequent safety issues of Chinese medicine have become the 'bottleneck' impeding the modernization of TCM. It was proved that mycotoxins seriously affect TCM safety; the pesticide residues of TCM are a key problem in TCM international trade; adulterants have also been detected, which is related to market circulation. These three factors have greatly affected TCM safety. In this study, fast, highly effective, economically-feasible and accurate detection methods concerning TCM safety issues were reviewed, especially on the authenticity, mycotoxins and pesticide residues of medicinal materials.

9.
Article in Chinese | WPRIM | ID: wpr-446821

ABSTRACT

Objective To evaluate the effect of sevoflurane anesthesia on activation of gliocytes in aged rat hippocampi.Methods One hundred and four male Wistar rats,weighing 600-650 g,were randomly divided into 2 groups (n =52 each) using a random number table:control group (group C) and sevoflurane group (group S).Group S inhaled 3.6% sevoflurane for 2 h,and open reduction and internal fixation was performed after tibial fracture was induced.Y-maze test and fear conditioning test were carried out on days 1,3 and 7 after surgery.Six rats of each group were chosen on days 1,3 and 7 after surgery and hippocampi were removed to detect the activation of microglias and astrocytes (by immunofluorescence) and expression of interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-α) (by Western blot).Results Compared with group C,the number of entries into each arm was significantly reduced,the duration of N arm stay was shortened,the percentage of time spent freezing induced by condition and the percentage of time spent freezing induced by context were decreased,and the activation of microglias and astrocytes was increased,and the expression of IL-6 and TNF-α was up-regulated in S groups (P < 0.05).Conclusion Sevoflurane-induced postoperative cognitive dysfunction may be related to enhanced activation of gliocytes in aged rat hippocampi.

10.
Article in Chinese | WPRIM | ID: wpr-451180

ABSTRACT

Objective To investigate the effect of sevoflurane anaesthesiaon the expression of N-methyl-D-aspartate (NMDA ) receptor in the developing hippocampal neurons in neonatal rats .Methods Sixty-four healthy male Sprague-Dawley rats ,aged 7 days ,weighing 10-15 g ,were randomly divided into 2 groups with 32 rats in each group using a random number table:control group (group C ) and sevoflurane anaesthesia group (group S ) . Animals in group C inhaled 30% oxygen for 6 h ,while animals in group S inhaled 3% sevoflurane for 6 h .Y-maze test was performed in the rats at 21 and 28 days after birth to evaluate the memory function .On 7 days after birth (immediately after the end of oxygen inhalation or sevoflurane anesthesia ) ,and 14 ,21 and 28 days after birth ,the expression of 1 ,2A and 2B subunits-containing NMDA receptors in the total protein and membrane protein in hippocampal neurons was determined by Western blot .The ratio of NMDA receptors in the membrane protein to those in the total protein (m/t ratio ) was calculated .Results Compared with group C ,the percentage of spontaneous alternation was significantly decreased on 21 and 28 days after birth ,the expression of 1 ,2A and 2B subunits-containing NMDA receptors in the membrane protein was down-regulated on 7-28 days after birth ,and m/t ratio was decreased in group S ( P0.05 ) .Conclusion The mechaism by which sevoflurane anaesthesia induces memory impairment in neonatal rats is related to inhibition of trafficking of NMDA receptors in the developing hippocampal neurons to the cell membrane ,and down-regulation of the number of NMDA receptors in the membrane protein .

11.
Article in Chinese | WPRIM | ID: wpr-450277

ABSTRACT

Objective To investigate the role of hippocampal α7 nicotinic acetylcholine receptor (α7nAChR) in sevoflurane-induced deficit in long-term cognitive function in neonatal rats.Methods Sixty-four male Sprague-Dawley rats,aged 7 days,weighing 10-15 g,were randomly divided into 4 groups (n =16each) using a random number table:control group (group C),sevoflurane anesthesia group (group S),sevoflurane anesthesia + α7nAChR agonist PNU-282987 group (group PS),and α7nAChR inhibitor MLA group (group M).In C and S groups,the rats inhaled 30% oxygen and 3% sevoflurane for 6 h,respectively.In group PS,PNU282987 (5 mg/kg) was injected intraperitoneally and 24 h later the rats were exposed to 3% sevoflurane for 6 h.In group M,MLA 3 mg/kg was injected intrappritoneally and 24 h later the rats inhaled 30% oxygen for 6 h.Eight rats in each group were randomly chosen and sacrificed immediately after oxygen or sevoflurane inhalation.The hippocampus was renoved for determination of the expression of α7nAChR and NR1,NR2A and NR2B subunitscontaining NMDA receptors in the total protein and membrane protein in hippocampal neurons.When the left rats in each group were raised to 2 months,Y-maze test was performed to detect the cognitive function.Results Compared with group C,the expression of α7nAChR and NR1,NR2A and NR2B subunits-containing NMDA receptors in the membrane protein was significantly down-regulated,and the percentage of spontaneous alternation was decreased in group S,the expression of NRI and NR2A subunits-containing NMDA receptors in the membrane protein was down-regulated (P < 0.05),and no significant change was found in the expression of NR2B subunitscontaining NMDA receptors in the membrane protein and percentage of spontaneous alternation in group PS (P > 0.05),and no significant change was found in the expression of NR1 and NR2A subunits-containing NMDA receptors in the membrane protein (P > 0.05),and the expression of NR2B subunits-containing NMDA receptors in the membrane protein was down-regulated,and the percentage of spontaneous alternation was decreased in group M (P < 0.05).Compared with group S,no significant change was found in the expression of NR1 and NR2A subunits-containing NMDA receptors in the membrane protein (P > 0.05),and the expression of NR2B subunitscontaining NMDA receptors in the membrane protein was significantly up-regulated,and the percentage of spontaneous alternation was increased in PS group (P < 0.05).There was no significant difference in the expression of α7nAChR and NR1,NR2A and NR2B subunits-containing NMDA receptors in the total protein and the number of entries into each arm in Y-maze test between the four groups (P > 0.05).Conclusion The mechanism by which sevoflurane induces deficit in long-term cognitive function may be related to decreased function of hippocampal α7nAChR and inhibition of function of NMDA receptors in neonatal rats.

12.
Article in Chinese | WPRIM | ID: wpr-434284

ABSTRACT

Mycotoxins are secondary metabolites produced by certain genera of toxigenic fungus and frequently oc-cur in food worldwide. Humans and animals can be simultaneously exposed to different mycotoxins through the diet. As most mycotoxins are highly toxic, carcinogenic, teratogenic and mutagenic, they have posed grave health threats to consumers. Determination of mycotoxins and their main metabolites in blood, urine, bile, milk or faeces can serve as biomarkers and can facilitate effective exposure assessment, crucial to estimate mycotoxin related dis-ease risk. According to reason mentioned above, the study of metabolism and evaluations of mycotoxins in biologi-cal fluids have been paid increasing attention since the results may offer valuable indications on the real risk for consumers. Therefore, it is important to develop proper analytical methods for the rapid quantitative and qualita-tive measurement of mycotoxins and key metabolites in vivo. This paper reviewed some biomarkers and their harm to animals and humans, systematically summarized the research progress of analytical methods and prospected the development trends.

13.
Article in Chinese | WPRIM | ID: wpr-288697

ABSTRACT

<p><b>OBJECTIVE</b>To establish a new method and validate its feasibilities for quality evaluation of Salvia miltiorrhiza.</p><p><b>METHOD</b>Four main effective components, dihydrotanshinone I, cryptotanshinone, tanshinone I and tanshinone II(A), were selected as analytes to evaluate the quality of S. miltiorrhiza. The relative correction factors (RCF) of tanshinone II(A) to the other three tanshinones were calculated. The method was evaluated by comparison of the quantitative results between external standard method and QAMS method.</p><p><b>RESULT</b>No significant differences were found in the quantitative results of four tanshinones by external standard method and QAMS method.</p><p><b>CONCLUSION</b>It is a convenient and accurate method to determine multi-components when some authentic standard substances were unavailable. It can be used to control the quality of S. miltiorrhiza.</p>


Subject(s)
Chromatography, High Pressure Liquid , Abietanes , Medicine, Chinese Traditional , Plant Roots , Chemistry , Plants, Medicinal , Chemistry , Reference Standards , Reproducibility of Results , Salvia miltiorrhiza , Chemistry
14.
Article in Chinese | WPRIM | ID: wpr-274354

ABSTRACT

<p><b>UNLABELLED</b>To determine the contents of aflatoxin B1, B2, G1 and G2 in Nelumbinis Semen using on-line post-column photochemical derivatization-HPLC-FLD method and verify the method by LC-MS method.</p><p><b>METHOD</b>The samples were extracted with MeOH-H2O (80: 20) and purified with inmunoaffinity column, aflatoxins were analyzed by HPLC-FLD with post-column photochemical derivatizaton. The positive samples were further confirmed by LC-MS/MS.</p><p><b>RESULT</b>On optimum conditions, aflatoxin B1, G1 ranging 0.3-30 mg x L(-1) showed a good linear relationship with aflatoxin B2, G2 ranging 0.09-9.0 mg x L(-1) with r >0.999 9. The recoveries ranged between 86.7% and 99.1%, with RSDs all bellow 4.87%. LOD of aflatoxin B1, B2, G1 and G2 were 0.08, 0.03, 0.10, 0.03 microg x kg(-1), respectively. Among 20 Nelumbinis Semen samples, 14 were found to contain aflatoxin B1 ranging from 0.40 to 586 microg x kg(-1). The total content of aflatoxin B1, B2, G1 and G2 were between 0.40 and 602.5 microg x kg(-1). By LC-MS/MS method, the same fragment ions were founded in samples and the control group at the same retention times, ruling out the possibility of false positive samples.</p><p><b>CONCLUSION</b>The method is simple, highly sensitive and reproducible for the determination of aflatoxins in Nelumbinis Semen.</p>


Subject(s)
Aflatoxins , Chemistry , Chromatography, High Pressure Liquid , Chromatography, Liquid , Drugs, Chinese Herbal , Chemistry , Food Contamination , Reproducibility of Results , Sensitivity and Specificity , Tandem Mass Spectrometry
15.
Acta Pharmaceutica Sinica ; (12): 822-7, 2011.
Article in Chinese | WPRIM | ID: wpr-415021

ABSTRACT

A rapid and sensitive analytical method was developed for the simultaneous determination of fumonisins B1 and B2 in traditional Chinese medicines by HPLC-MS/MS. The detection limits for fumonisins B1 and B2 were 0.25 ng x mL(-1) corresponding to 2 microg x kg(-1) in samples. Recoveries from different samples spiked with fumonisins B1 and B2 at levels ranging from 0.2 to 3 mg x kg(-1) were 84.0%-96.1% and 86.3%-99.3%, respectively. Among the total of 34 samples purchased from local markets, ten samples of which were visibly moldy samples due to inappropriate storage, and 24 were normal samples. The results showed that 6 of the visibly moldy samples and 5 of the normal samples were contaminated with total fumonisins at levels ranging 82.4-2349 microg x kg(-1) and 102-729 microg x kg(-1), respectively.

16.
Article in Chinese | WPRIM | ID: wpr-413018

ABSTRACT

Objective To evaluate the clinical effect of laparoscopic surgery for the patients suffering from ovarian cysts. Methods 127 patients with benign ovarian cysts who underwent laparoscopic surgery were retrospectively analyzed,and 129 underwent laparotomy surgery as the control group. Results There were significant differences in duration of the operation,amount of blood loss,exhaust time and hospitalization time between the patients undergoing laparoscopic surgery and laparotomy surgery. Conclusion Laparoscopic surgery was a kind of ideal type of treatment for the patients with ovarian cysts.

17.
Article in Chinese | WPRIM | ID: wpr-354158

ABSTRACT

<p><b>OBJECTIVE</b>To investigate the effect of patulin producing strains on the different Chinese medicinal materials and the toxin biosynthesis mechanism.</p><p><b>METHOD</b>Microbiology and HPLC analytical methods were adopted in this paper.</p><p><b>RESULT</b>It was showed that the materials rich in starch and other polysaccharides were easily polluted by the patulin producing strain. This strain grew well and produced more toxins under 25 degrees C, 95% moisture content and bulk package. And the effect of low illumination intensity on the strain growth and toxin biosynthesis was not notable. Sample stability, precision, repeatability and rate of recovery were studied. HPLC analytic method was established and it revealed that the test method was suitable.</p><p><b>CONCLUSION</b>The pollution of Chinese medicinal materials by toxin producing microbes will be effectively controlled through establishing the suitable storage methods. So the study on the growing characteristics and toxin biosynthesis mechanism of toxin producing strains will be an important practical significance for controlling the toxin pollution of herbal medicines and contribute to establish the evaluation system of Chinese medicine safety.</p>


Subject(s)
Drug Compounding , Reference Standards , Drug Contamination , Drugs, Chinese Herbal , Reference Standards , Fungi , Metabolism , Patulin , Quality Control , Safety
18.
Article in Chinese | WPRIM | ID: wpr-283198

ABSTRACT

<p><b>OBJECTIVE</b>To develop a method for the simultaneous determination of aflatoxin B1, B2, G1, G2 and ochratoxin A in Glycyrrhiza uralensis by HPLC-FLD after immunoaffinity column with online post-column photochemical derivatization.</p><p><b>METHOD</b>Sample was extracted with MeOH: H2O (80:20) and cleaned up by immunoaffinity column. The toxins were separated by reversed-phase HPLC and the mobile phase was consisted of methanol and 0.5% acetic acid solution with gradient elution. The determination was carried out by fluorescence detector after photochemical derivatization.</p><p><b>RESULT</b>The detection limits of aflatoxin G2, G1, B2, B1 and ochratoxin A were 0.02, 0.06, 0.015, 0.03 and 0.25 microg x kg(-1), respectively. The recoveries of analytes were from 76.0% to 103% and the relative standard deviations (RSDs) were below 13%.</p><p><b>CONCLUSION</b>The method is a simple, accurate and can be used to determine the contents of aflatoxin B1, B2, G1, G2 and ochratoxin A in G. uralensis simultaneously.</p>


Subject(s)
Aflatoxins , Chemistry , Chromatography, Affinity , Methods , Chromatography, High Pressure Liquid , Methods , Glycyrrhiza uralensis , Chemistry , Ochratoxins , Chemistry , Photochemical Processes
19.
Article in Chinese | WPRIM | ID: wpr-279383

ABSTRACT

<p><b>OBJECTIVE</b>To determine the fungal populations in seven ochratoxin A contaminated root herbs in Jiangxi province, and investigate the mycoflora associated with mycotoxin contamination in the root herbs.</p><p><b>METHOD</b>Single spore isolation was used to obtain the strains from root herb's surface. Fungi were identified according to morphology and molecular evidence.</p><p><b>RESULT</b>Seventeen fungal species belonged to six isolated genera, nine species of Penicillium, three species of Aspergillus, two species of Fusarium and three other species were identified.</p><p><b>CONCLUSION</b>Fungal contamination of root herbs demands urgent attention, ochratoxin A producing fungi possess specific distribution on herbs.</p>


Subject(s)
Drug Contamination , Drugs, Chinese Herbal , Reference Standards , Fungi , Ochratoxins , Plant Roots , Microbiology
20.
Article in Chinese | WPRIM | ID: wpr-260662

ABSTRACT

<p><b>OBJECTIVE</b>To establish a rapid determination method of pinoresinol diglucoside in Eucommiae unloads by near-infrared reflectance spectroscopy (NIRS).</p><p><b>METHOD</b>Forty-one samples of E. unloads were collected from three different producing areas and their main component, namely pinoresinol diglucoside, was determined by HPLC. Corresponding data of samples were collected from 12 000 to 4 000 cm(-1) by near-infrared reflectance spectroscopy. The spectral pretreatment was optimized by OPUS software and the calibration equations between the content of pinoresinol diglucoside and spectrum data were constructed by partial least squares regression.</p><p><b>RESULT</b>Available information could be extracted from spectra in the range from 7 502 to 4 597.6 cm(-1) after corrected by applying second derivative transformation and subtract a linear correction. Cross validation was used to prevent over-fitting. Good correlation existed between pinoresinol diglucoside content and NIR spectra ( R2 = 0.926 4, SEC = 0.029 and SEP = 0.066 2).</p><p><b>CONCLUSION</b>NIRS calibration equations developed in this study could be applied to the rapid analysis of the pinoresinol diglucoside content.</p>


Subject(s)
Eucommiaceae , Chemistry , Lignans , Spectrophotometry, Infrared , Methods , Time Factors
SELECTION OF CITATIONS
SEARCH DETAIL