Tengetile Nxumalo, Abdullah Akhdhar, Viktoria Müller, Amnah Al Zbedy, Andrea Raab, Milica Jovanovic, Erich Leitner, Andrew Kindness, Jörg Feldmann
{"title":"Determination of total extractable organofluorine (EOF) in food contact materials and target and non-target analysis of per- and polyfluoroalkyl substances using LC-MS/MS and LC-HRMS simultaneously coupled to ICP-MS.","authors":"Tengetile Nxumalo, Abdullah Akhdhar, Viktoria Müller, Amnah Al Zbedy, Andrea Raab, Milica Jovanovic, Erich Leitner, Andrew Kindness, Jörg Feldmann","doi":"10.1080/19440049.2024.2347491","DOIUrl":"10.1080/19440049.2024.2347491","url":null,"abstract":"<p><p>Food contact materials (FCMs) from three countries were analysed for all extractable organofluorines (EOFs) from the materials and subsequently by target and non-target analysis for per- and polyfluoroalkyl substances (PFAS). The EOF varied by two orders of magnitude for FCM from UK and Saudi Arabia ranging between 2.14 and 483 ng cm<sup>-2</sup> (0.2-48 ng g<sup>-1</sup>) showing that one quarter of all samples were above the Danish regulation for PFAS in FCM. Target PFAS showed high variability in composition and accounted for less than 1% of the EOF. Non-target PFAS screening using HPLC-ICP-MS and coupled simultaneously to HRMS showed the occurrence of organofluorines which were identified by neither LC-MS/MS nor LC-HRMS. This illustrates that the current target PFAS approaches fail to identify EOFs from FCM, which would be a problem with the new EU proposal to ban all PFAS.</p>","PeriodicalId":12295,"journal":{"name":"Food Additives and Contaminants Part A-chemistry Analysis Control Exposure & Risk Assessment","volume":" ","pages":"856-866"},"PeriodicalIF":2.3,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140904401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mustafa Rahim Abro, Nadeem Rashid, Khanoranga, Zainab Siddique
{"title":"<i>In-vivo</i> evaluation of the adverse effects of ochratoxin A on broiler chicken health and adsorption efficacy of indigenous and commercial clay of Balochistan, Pakistan.","authors":"Mustafa Rahim Abro, Nadeem Rashid, Khanoranga, Zainab Siddique","doi":"10.1080/19440049.2024.2354491","DOIUrl":"10.1080/19440049.2024.2354491","url":null,"abstract":"<p><p>Mycotoxins in animal feed pose health risks and economic losses, but using various adsorbent types could potentially protect animals from mycotoxicosis. The study aimed to assess the effect of OTA on the health of broiler chickens and to envisage the ameliorative potential of clay adsorbents. The objectives of this <i>in vivo</i> study were to investigate the effects of OTA on productivity, biochemical parameters, fecal residues, and the preventive effects of indigenous and commercial clay of Balochistan as adsorbents to alleviate the adverse effects of exposure. Male broiler chickens (<i>n</i> = 160) were treated with 400 μg/kg OTA and 0.5 g/kg clay adsorbent for 42 days, with feed and water available in an ad libitum manner. The amount of OTA in diet and fecal residues was assessed through HPLC. The administration of OTA in the diet, resulted in a significant (<i>p</i> < 0.05) decrease in the average daily gain (ADG) and average daily feed intake (ADFI) while increasing the feed conversion ratio (FCR) as compared to the control group. Furthermore, no significant (<i>p</i> > 0.05) differences were found between the weight gain of broiler chickens fed without OTA (positive control) and that of chickens fed adsorbent. The group given a diet containing OTA without adsorbents as compared to the control and adsorbent-supplemented group has shown a significant (<i>p</i> < 0.05) increase in the relative weight of the liver, kidney, gizzard, and proventriculus while decreasing the relative weight of the spleen and bursa of Fabricius. Alterations in the levels of serum total protein (TP), cholesterol (CHL), serum urea (SU), enzymatic activity (aspartate aminotransferase (AST) and alanine transaminase (ALT)), and creatinine were observed in the OTA-intoxicated and adsorbent-supplemented groups as compared to the control group. Adsorbent supplementation resulted in a significantly (<i>p</i> < 0.05) higher OTA content in the faeces. It can be concluded from the results of this study, that OTA intoxication negatively affects the health of broiler chickens, and the clay of Balochistan has shown effective adsorption potential against OTA.</p>","PeriodicalId":12295,"journal":{"name":"Food Additives and Contaminants Part A-chemistry Analysis Control Exposure & Risk Assessment","volume":" ","pages":"833-845"},"PeriodicalIF":2.3,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141070730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yi Li, Dan Chen, Wusheng Fu, Yan Yang, Huafeng Chen, Lei Ni, Hongjing Chen, Dingguo Jiang, Sophia Zhang, Rongjuan Gui
{"title":"Determination of chloropropanol esters and glycidyl esters in nutritional foods by gas chromatography-tandem mass spectrometry based on acid hydrolysis and solid-phase extraction.","authors":"Yi Li, Dan Chen, Wusheng Fu, Yan Yang, Huafeng Chen, Lei Ni, Hongjing Chen, Dingguo Jiang, Sophia Zhang, Rongjuan Gui","doi":"10.1080/19440049.2024.2353796","DOIUrl":"10.1080/19440049.2024.2353796","url":null,"abstract":"<p><p>This study presents a method based on acid transesterification and the purification by solid-phase extraction (SPE) coupled with gas chromatography-tandem mass spectrometry for quantifying 3- and 2-monochloropropanediol esters (3-MCPDE, 2-MCPDE) and glycidyl esters (GE) in nutritional foods. The fat was extracted by liquid-liquid extraction with petroleum ether and diethyl ether after the sample was hydrolysed with ammonia. Then the extract was purified by a SPE cartridge filled with the aminopropyl sorbents. It was demonstrated that the optimal elution volume for 3-MCPDE, 2-MCPDE and GE greatly depended on the sample matrix and varied from 6 to 12 mL for four different kinds of food matrices. All three analytes in the sample solution could be fully collected in the first 10-12 mL of eluate. By this way, monoacylglycerols commonly present in the samples were fully removed. Therefore, the overestimation of GE quantification was effectively eliminated. The modified analytical procedure was fully validated in a single laboratory and has been recommended as a Chinese Food Safety National Standard. In addition, two derivatisation agents, heptafluorobutyrylimidazole and phenylboronic acid, were proved to be equivalent in method accuracy and precision for the quantification of three analytes.</p>","PeriodicalId":12295,"journal":{"name":"Food Additives and Contaminants Part A-chemistry Analysis Control Exposure & Risk Assessment","volume":" ","pages":"756-770"},"PeriodicalIF":2.3,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141157141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Elemental composition and contaminants of saffron from different origins and geographical discrimination using chemometrics.","authors":"Leena Kumari, S Swarupa Tripathy","doi":"10.1080/19440049.2024.2346264","DOIUrl":"10.1080/19440049.2024.2346264","url":null,"abstract":"<p><p>Elements such as As, Cd, Cr and Pb are classified as contaminants of major concern for public health, due to their high degree of toxicity. Saffron is an important medicinal herbal spice used in variety of food items, pharmaceutical medicines, and cosmetics. Presence of heavy metals in saffron will increase the health risk to consumers. Also, authentication of geographical origin of saffron is an issue of utmost importance for global trading. The present study is focused on investigation of elemental contaminants in saffron and elemental composition of saffron from India (Jammu and Kashmir); Iran and Afghanistan are also explored for geographical discrimination, using Chemometrics. In total, 29 elements including Ag, Al, As, B, Ba, Be, Ca, Cd, Co, Cr, Cu, Fe, K, Li, Mg, Mn, Mo, Na, Ni, P, Pb, Sb, Se, Si, Sr, Ti, Tl, V and Zn were analyzed using ICP-OES. Toxic elemental contaminants including As, Cd, Pb were found below the maximum permissible limit. Using PCA, elements B, Ni, Ba, Fe, V, Si, Al, Ti, K, Na, Sr, and Zn were found as significant discriminators of geographical origin. Elemental composition of saffron may be utilized, to prevent cases of falsified geographical origin in trade.</p>","PeriodicalId":12295,"journal":{"name":"Food Additives and Contaminants Part A-chemistry Analysis Control Exposure & Risk Assessment","volume":" ","pages":"715-729"},"PeriodicalIF":2.3,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140854763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A pilot study of the contribution of energy-dense Caribbean diets to acrylamide exposure with associated health risks for a population of university students in Trinidad and Tobago.","authors":"Dahryn Andilla Augustine, Navin Dookeram, Shelinie Albert, Sterling James, Grace-Anne Bent","doi":"10.1080/19440049.2024.2351986","DOIUrl":"10.1080/19440049.2024.2351986","url":null,"abstract":"<p><p>Previous studies on university students have indicated a significant decline in the consumption of fruits and vegetables complemented by an increase in energy-dense foods. The food toxicant, acrylamide, typically occurs in carbohydrate-rich, energy-dense foods that have been heated. Hence, this work presents an estimated dietary acrylamide exposure for university students in Trinidad and Tobago. A 2-day dietary recall method was used to obtain the food consumption information from 683 university students of differing sociodemographic backgrounds. The acrylamide exposure was estimated using a deterministic approach. The median acrylamide intake was estimated to be 1.39 µg/kg bw/day. The estimated mean acrylamide dietary intakes for the female and male population were 1.40 and 1.37 µg/kg bw/day, respectively. Coffee was determined to be the major dietary contributor to acrylamide exposure. However, bread was the food item that was most frequently consumed among the students. Using multiple linear regression, a possible correlation was detected between the acrylamide exposure and these variables: dietary habits (mostly eat out; <i>p</i> < 0.05), and Indian ethnicity (<i>p</i> < 0.10). Using the margin of exposure approach, dietary acrylamide exposure was found to be a health concern with regards to neurotoxicity and carcinogenicity. An evaluation of the procedures and results from this pilot study was carried out for the potential of conducting a full-scale research project.</p>","PeriodicalId":12295,"journal":{"name":"Food Additives and Contaminants Part A-chemistry Analysis Control Exposure & Risk Assessment","volume":" ","pages":"742-755"},"PeriodicalIF":2.3,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140897935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Assessing several fungal contaminants and their associated mycotoxins in maize cultivated on cornfields of Republic of Moldova.","authors":"Cristina Grajdieru, Irina Mitina, Lidia Tumanova, Valentin Mitin","doi":"10.1080/19440049.2024.2345721","DOIUrl":"10.1080/19440049.2024.2345721","url":null,"abstract":"<p><p>Maize is an important crop for the Republic of Moldova and one of the crops most contaminated with mycotoxins. Maize grain obtained from plants cultivated on Moldavian cornfields in 2021 and 2022 were tested for mycotoxigenic risk using qPCR with primers to several fungal genome sequences engaged in mycotoxin synthesis and ELISA test to screen total aflatoxins, fumonisin B1, zearalenone, deoxynivalenol and T-2 toxin. Except for T-2 toxin, the mycotoxin concentrations were under the limits of detection and did not exceed maximum admissible levels for unprocessed grain. Concentrations of T-2 toxin in grain samples did not correlate significantly with the quantity of toxigenic <i>F. sporotrichioides</i>. All of the analysed grain samples were contaminated with at least one toxigenic fungus, and 20% of the samples were infected with seven different species of toxigenic fungi. Accumulation of fungi in maize kernels was affected significantly by the season, and generally a decrease was observed in fungal frequency and quantity under drought conditions. However, several toxigenic <i>Aspergillus</i> and <i>Fusarium</i> fungi that are able to produce aflatoxins and fumonisins under improper storage conditions were found in the kernels during the whole period of monitoring.</p>","PeriodicalId":12295,"journal":{"name":"Food Additives and Contaminants Part A-chemistry Analysis Control Exposure & Risk Assessment","volume":" ","pages":"675-687"},"PeriodicalIF":2.9,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140854762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dmitry A Makarov, Alexey V Tretyakov, Alexandra A Sarkhanova, Svetlana V Sysueva, Arusyak Z Ispiryan, Sergey V Belov, Leonid K Kish
{"title":"Stability of thirteen antimicrobials in incurred samples of animal tissues, milk, eggs, and honey after freeze-storage.","authors":"Dmitry A Makarov, Alexey V Tretyakov, Alexandra A Sarkhanova, Svetlana V Sysueva, Arusyak Z Ispiryan, Sergey V Belov, Leonid K Kish","doi":"10.1080/19440049.2024.2345715","DOIUrl":"10.1080/19440049.2024.2345715","url":null,"abstract":"<p><p>Monitoring of antimicrobials residues in food of animal origin is performed by control laboratories to ensure public health, and knowledge of the stability of antimicrobials during storage is essential for the reliability of results. For stability studies, analysis of incurred samples is preferential to fortified samples due to the possible conversion of antimicrobial metabolites back to parent compounds during sample preparation, storage, and analysis of the incurred samples, resulting in an increased concentration of the analyte. We have analyzed the concentrations of 13 antimicrobials from 8 groups (tetracyclines, fluoroquinolones, phenicols, sulfonamides, aminoglycosides, penicillins, macrolides, and nitroimidazoles) at different time points of freeze-storage (1 week; 1, 2, and 3 months) using HPLC-MS/MS. Incurred samples were prepared from muscle tissue, liver, kidneys, eggs, and milk taken from different animals (cows, pigs, poultry, goats, and fish). Incurred and fortified samples of honey were investigated as well. The results have shown that all analytes in all samples were stable during the investigated periods regardless of animal species, matrix, and concentration levels.</p>","PeriodicalId":12295,"journal":{"name":"Food Additives and Contaminants Part A-chemistry Analysis Control Exposure & Risk Assessment","volume":" ","pages":"610-616"},"PeriodicalIF":2.9,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140862655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The occurrence of aflatoxins and labelling compliance of locally produced za'atar mix products.","authors":"Samer Mudalal","doi":"10.1080/19440049.2024.2346260","DOIUrl":"10.1080/19440049.2024.2346260","url":null,"abstract":"<p><p>Za'atar mix products are mainly composed of the dried and ground leaves and/or blossoms of wild and cultivated plant species (<i>Origanum</i>, <i>Thymbra</i>, <i>Thymus</i>, and <i>Satureja</i>) with the addition of condiments. The aim of this study was to evaluate the occurrence of aflatoxins, chemical composition (carbohydrates, fibre, fat, protein, moisture, ash, and acid contents), mineral content (Na, Ca, and K), and colour traits (L*a*b*) in relation to food label and food standards compliance. Measured and labelled fat content did not agree for approximately 91% of the samples. There was also no agreement between the measured and labelled fibre contents. The total content of aflatoxins in the tested samples ranged from 2 to 63.7 ng g<sup>-1</sup>. Eleven (69%) of the 16 analysed products had total aflatoxins higher than the maximum permitted limit of the European Commission. The KAS and LAZ products had significantly lighter colour (the highest L* values), while the ALAQ product had the darkest colour (lowest L* value). The range of sodium content in the tested products was 105.1-1425.3 mg/100 g. In conclusion, za'atar mix products that are available in local markets do not have accurate nutritional labelling information, and the occurrence of aflatoxins was very high. Further studies are needed to evaluate the reasons for these quality defects.</p>","PeriodicalId":12295,"journal":{"name":"Food Additives and Contaminants Part A-chemistry Analysis Control Exposure & Risk Assessment","volume":" ","pages":"688-698"},"PeriodicalIF":2.9,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140862605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Faizah Muhammad Yunus, Yatimah Alias, Noorfatimah Yahya, Nur Nadhirah Mohamad Zain, Muggundha Raoov
{"title":"Poly-(ionic liquid) coated with magnetic nanoparticles for micro solid phase extraction of polycyclic aromatic hydrocarbons in food samples.","authors":"Faizah Muhammad Yunus, Yatimah Alias, Noorfatimah Yahya, Nur Nadhirah Mohamad Zain, Muggundha Raoov","doi":"10.1080/19440049.2024.2326426","DOIUrl":"10.1080/19440049.2024.2326426","url":null,"abstract":"<p><p>Poly(methyl methacrylate-vinyl imidazole bromide) (poly-MMA-IL)-grafted magnetic nanoparticles were successfully developed and applied in the micro-magnetic solid phase extraction (μ-MSPE) for 16 types of polycyclic aromatic hydrocarbons (PAHs) from tea, fried food, and grilled food samples via gas chromatography flame ionization detector (GC-FID). One variable at a time (OVAT) and response surface methodology (RSM) were used for efficient optimization. The validation method showed a good coefficient of determination (<i>R</i><sup>2</sup>) ranging from 0.9901 to 0.9982 (<i>n</i> = 3) with linearity of 0.2 μg L<sup>-1</sup>-500 μg L<sup>-1</sup>. Detection and quantification limits were 0.06 µg L<sup>-1</sup>-0.32 µg L<sup>-1</sup> and 0.18 µg L<sup>-1</sup>-0.97 µg L<sup>-1</sup>. Additionally, satisfactory reproducibility was attained with intra-day and inter-day precisions having RSD ranges of 3.6%-11.1%. The spiked recovery value of 16 PAHs in fried food, grilled food and tea samples obtained from the night market in Malaysia ranged from 80%-12%, respectively.</p>","PeriodicalId":12295,"journal":{"name":"Food Additives and Contaminants Part A-chemistry Analysis Control Exposure & Risk Assessment","volume":" ","pages":"495-512"},"PeriodicalIF":2.9,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140101403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sofiyatul Akmal Salim, Nur Harniada Baharudin, Nur Shahila Ibrahim, Zalilawati Abd Ghani, Mohd Nazri Ismail
{"title":"Determination of aflatoxins in rice from Penang, Malaysia by dispersive liquid-liquid micro-extraction and LC-MS/MS.","authors":"Sofiyatul Akmal Salim, Nur Harniada Baharudin, Nur Shahila Ibrahim, Zalilawati Abd Ghani, Mohd Nazri Ismail","doi":"10.1080/19440049.2024.2329614","DOIUrl":"10.1080/19440049.2024.2329614","url":null,"abstract":"<p><p>Rice is one of the crops cultivated in Malaysia, and it is the main diet for most of the population. In this study, dispersive liquid-liquid micro-extraction (DLLME) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) were used to develop, optimise and validate a reliable, easy-to-use and quick approach to detect aflatoxin B1 (AFB1), aflatoxin B2 (AFB2), aflatoxin G1 (AFG1) and aflatoxin G2 (AFG2). The extraction recoveries in DLLME were enhanced by the addition of 5% salt, utilising chloroform as the extraction solvent and acetonitrile as the dispersive solvent. The DLLME parameters - the extraction solvent volume, salt concentration and dispersive solvent volume were optimised with Box-Behnken design (BBD) and response surface methodology (RSM). Under optimised experimental conditions, excellent linearity was obtained with a limit of detection (LOD) ranging from 0.125 to 0.25 ng g<sup>-1</sup>, a limit of quantitation (LOQ) ranging from 0.25 to 0.3 ng g<sup>-1</sup> and a correlation value (<i>R</i><sup>2</sup>) of 0.990. The matrix effects were between -11.1% and 19.9%, and recoveries ranged from 87.4% to 117.3%. The optimised and validated method was used effectively to assess aflatoxins contamination in 20 commercial rice samples collected from local supermarkets in Penang, Malaysia. AFB1 was detected at 0.41-0.43 ng g<sup>-1</sup> in two rice samples, below the regulatory limit.</p>","PeriodicalId":12295,"journal":{"name":"Food Additives and Contaminants Part A-chemistry Analysis Control Exposure & Risk Assessment","volume":" ","pages":"563-574"},"PeriodicalIF":2.3,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140287213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}