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《农产品加工．学刊》2017,(4)
建立了使用高效液相色谱串联质谱法检测食品中罗丹明B含量的分析方法。食用油样品经70%甲醇水溶液提取后,直接可用于进样分析,固体样品以70%甲醇溶液提取、MCX固相萃取柱净化,经色谱柱分离后,以0.1%甲酸水和乙腈梯度洗脱,经ESI+模式、多反应模式(MRM)进行检测。结果表明,罗丹明B在1.0~100.0 ng/mL质量浓度范围内呈良好的线性关系,空白样品加标的回收率在90.3%~96.8%,相对标准偏差(RSD)均小于5%,检出限为0.5μg/kg,具有快速、准确、灵敏度高等优点,适用于食品中罗丹明B的定性和定量分析。 相似文献
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高效液相色谱法同时检测蔬菜中7种农药残留方法的分析 总被引：1，自引：0，他引：1
试验建立了同时测定韭菜、大葱中多菌灵、吡虫啉等7种农药残留的液相色谱分析方法。样品经乙腈提取,氨基固相萃取小柱净化,紫外检测器检测,外标法定量。结果表明：在0.03~4.0 mg/L的范围内,7种农药的线性相关系数均大于0.99,检出限为0.006~0.05 mg/kg,定量限为0.02~0.10 mg/kg;在0.050、0.10和1.0 mg/kg 3个添加水平下,平均回收率在79%~103%,相对标准偏差为0.70%~6.12%。该方法适用于韭菜、大葱中多菌灵、吡虫啉等7种农药的残留检测。 相似文献
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首个噻菌灵种子处理剂产品获批登记 总被引：1，自引：0，他引：1
《农药市场信息》2017,(18)
<正>5月31日,瑞士先正达作物保护有限公司申请的18%噻灵·咯·精甲(13.7%噻菌灵+2.45%咯菌腈+1.85%精甲霜灵)种子处理悬浮剂产品获批临时登记(LS20170358),登记作物和防治对象为玉米茎基腐病。这也是我国批准登记的首个噻菌灵种子处理剂产品。噻菌灵属苯并咪唑类杀菌剂,与多菌灵杀菌谱类似,其作用机制为抑制植物病原真菌有丝分裂过程中的微管蛋白的形成。目前,噻菌灵在我国主要登记用于 相似文献
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《农产品加工．学刊》2017,(23)
建立了婴幼儿配方奶粉中双酚A和壬基酚的液相色谱-串联质谱法的测定方法。样品经溶剂提取净化后,采用Poroshell 120SB-C18型液相色谱柱分离,以0.1%氨水和甲醇为流动相,进行梯度洗脱,采用多反应监测模式,外标法定量。结果表明,双酚A的方法检出限为0.05μg/kg,壬基酚的方法检出限为0.1μg/kg。线性范围内低、中、高3个添加水平双酚A的回收率为76.80%~86.75%,壬基酚的回收率为77.00%~87.34%。该方法具有灵敏度高、定性定量准确等特点,适用于婴幼儿配方乳粉中双酚A和壬基酚的检测。 相似文献
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《农产品加工．学刊》2021,(9)
建立超高效液相色谱-串联质谱法,用以检测含植物提取物类化妆品中7种禁用农药残留量的分析方法。前处理采用改进QuEChERS方法,样品经乙腈涡旋提取后,以QuEChERS法净化提取液,有效降低样品中复杂基质所带来的基质干扰,再经UPLC-MS/MS分析,以基质空白配标的外标法定量。结果表明,7种农药残留在20～400μg/L范围内具有较好的线性关系,相关系数均大于0.99。加标水平在10,20,100μg/kg时,7种农药的回收率为70%～110%,相对标准差系数小于15%,4类含植物提取物类化妆品进行加标回收率为70%～110%。该方法适用于4类含植物提取物类化妆品中7种禁用农药残留量的分析检测。 相似文献
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爪哇镰刀菌和尖孢镰刀菌对甘薯具有强致病力，为了筛选对2种病原菌防效较好的药剂，采用菌丝生长速率法分别测定多菌灵、甲基硫菌灵、腐酶利、肟菌·戊唑醇、唑醚·代森联、咪鲜胺、中生菌素和四霉素对2株甘薯致病镰刀菌的室内毒力。结果表明，对爪哇镰刀菌菌株菌丝生长抑制作用最强的为四霉素和咪鲜胺，EC50分别为1.292、2.145μg/mL，其次为中生菌素和肟菌·戊唑醇，EC50分别为16.652、28.641μg/mL，腐酶利、甲基硫菌灵、多菌灵和唑醚·代森联对爪哇镰刀菌菌株的抑制作用最差，EC50分别为440.540、637.120、680.765μg/mL和22385.367μg/mL；对尖孢镰刀菌菌株菌丝生长抑制作用最强的为四霉素、咪鲜胺和肟菌·戊唑醇，EC50分别为0.03、0.131μg/mL和0.177μg/mL，其次为中生菌素和多菌灵，EC50分别为3.66、14.408μg/mL。甲基硫菌灵和唑醚·代森联对尖孢镰刀菌菌株菌丝生长抑制作用较差，EC50分... 相似文献
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多菌灵、苯菌灵和甲基托布津的科学使用 总被引：1，自引：0，他引：1
多菌灵、苯菌灵和甲基托布津都属于苯并咪唑类杀菌剂,是植物保护中最常用的3种杀菌剂。虽然它们的名称和成分不同,但杀菌机理是一样的。现将它们的科学使用方法介绍如下,供农民朋友参考。 相似文献
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王跃 《农产品加工．学刊》2018,(11)
为了准确测定肉类中的糖皮质激素含量,建立固相萃取-超高效液相色谱-串联质谱法分析测定肉类中的曲安西龙、氢化可的松、地塞米松、泼尼松、泼尼松龙和倍他米松6种糖皮质激素。样品经过提取后采用固相萃取法净化、富集,在负离子模式下采用MRM模式,采用BEH C18型色谱柱,以5 mmol/L甲酸铵和乙腈为流动相进行分离,并进行定性和定量分析,结果表明在10~200 ng/m L的质量浓度范围内,线性关系良好,相关系数在0.999 1~0.999 9。方法的检出限为0.1~0.3μg/kg,定量限为0.3~1.0μg/kg,回收率为84.3%~95.6%。 相似文献
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Biological Activity and Quantification of Suspected Allelochemicals from Alfalfa Plant Parts 总被引：7，自引：0，他引：7
Autotoxicity restricts reseeding of alfalfa (Medicago sativa L.) after alfalfa until autotoxic chemical(s) breaks down or is dispersed into external environments. A series of aqueous extracts from leaves, stems, roots and seeds of alfalfa ‘Vernal’ were bioassayed against alfalfa seedlings of the same cultivar to determine their autotoxicity. The highest inhibition was found in the extracts from the leaves. Extracts at 40 g dry tissue l?1 from alfalfa leaves were 15.4, 17.5 and 28.7 times more toxic to alfalfa root growth than were those from roots, stems and seeds, respectively. A high‐performance liquid chromatography (HPLC) analysis with nine standard compounds showed that the concentrations and compositions of allelopathic compounds depended on the plant parts. In leaf extracts that showed the most inhibitory effect on root growth, the highest amounts of allelochemicals were detected. Among nine phenolic compounds assayed for their phytotoxicity on root growth of alfalfa, coumarin, trans‐cinnamic acid and o‐coumaric acid at 10?3 m were most inhibitory. The type and amount of causative allelochemicals found in alfalfa plant parts were highly correlated with the results of the bioassay, indicating that the autotoxic effects of alfalfa plant parts significantly differed. 相似文献
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C. J. Spurr D. A. Fulton P. H. Brown R. J. Clark 《Journal of Agronomy and Crop Science》2002,188(4):275-280
Development of onion (Allium cepa L., cv. ‘Early Cream Gold’) seed under cool climate conditions in Tasmania, Australia occurred over a longer duration than previously reported, but similar patterns of change in yield components were recorded. In contrast to previous studies, umbel moisture content declined from 85 to 67 % over 57 days while seed moisture content decreased from 85 to 31 %. Seed yield continued to increase over the duration of crop development, with increasing seed weight compensating for seed loss resulting from capsule dehiscence in the later stages of maturation. Germination percentage was high and did not vary significantly from 53 to 77 days after full bloom (DAF), but mean germination time declined and uniformity of germination increased significantly over the same time period. The percentage abnormal seedlings declined with later harvest date, resulting in highest seed quality at 77 DAF. The results of this study suggest that the decision to harvest cool climate onion seed crops before capsule dehiscence will result in a loss of potential seed yield and quality. 相似文献
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Jens Jensen 《Euphytica》1979,28(1):47-56
Summary The high-lysine gene in Risø mutant 1508 conditions an increased lysine content in the endosperm via a changed protein composition, a decreased seed size, and several other characters of the seed. The designation lys3a, lys3b, and lys3c, is proposed for the allelic high-lysine genes in three Risø mutants, nos 1508, 18, and 19. Linkage studies with translocations locate the lys3 locus in the centromere region of chromosome 7. A linkage study involving the loci lys3 and ddt (resistance to DDT) together with the marker loci fs (fragile stem), s (short rachilla hairs), and r (smooth awn) show that the order of the five loci on chromosome 7 from the long to the short chromosome arm is r, s, fs, lys3, ddt. The distance from locus r to locus ddt is about 100 centimorgans. 相似文献
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G. H. Kroon 《Euphytica》1994,76(1-2):125-125
Summary
K x vadensis is a hybrid of K. blossfeldiana and K. marmorata obtained after doubling the number of chromosomes. 相似文献
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Hongyan WEI Jian ZHOU Jinguang LU Jingzheng SONG Qiongxi YU Zhihong JIANG 《Medicinal Plant》2019,(6):27-29
[Objectives]This study aimed to establish a QAMS(quantitative analysis of multi-components by single-marker)method for simultaneous determination of four phenol... 相似文献
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Summary Avoidance of rust fungi that was based on poor appressorium induction was previously found in Hordeum chilense. In the present study 95 accessions of Triticeae were screened for avoidance of Puccinia hordei. The percentage of appressorium formation per germinated spore ranged from 6 to 90%. On none of the 41 accessions of Aegilops, Agropyron, Elymus, Secale, Thinopyrum or Triticum studied was the rate of appressorium formation lower than 25%. Lower rates of appressorium formation were, however, found on accessions of wild barley species Hordeum brachyantherum, H. marinum, H. parodii and H. secalinum. Its implications in cereal breeding are discussed. 相似文献
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Summary Reactions of 13 grasses to Meloidogyne naasi varied with species; ryegrasses, fescues and their hybrids were generally susceptible and cocksfoot and timothy resistant. Marked variation in host resistance levels occurred between genotypes within cultivars.Selection of single plants, followed by tests on replicate tillers, identified resistant and susceptible genotypes in both Italian and perennial ryegrass cultivars. Resistant plants had few nematode-induced galls and fewer females and eggs than susceptibles. There was more or less continuous variation, with many genotypes intermediate between extremes of resistance and susceptibility. Selected resistant and susceptible genotypes are of use in assessing variation in nematode populations and as controls for breeding and selection programmes. 相似文献
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W. Erskine M. Tufail A. Russell M. C. Tyagi M. M. Rahman M. C. Saxena 《Euphytica》1993,73(1-2):127-135
Lentil production is limited by lack of moisture and unfavorable temperatures throughout its distribution. Waterlogging and salinity are only locally important. Progress has been made in breeding for tolerance to drought through selection for an appropriate phenology and increased water use efficiency and in breeding for winter hardiness through selection for cold tolerance.The diseases rust, vascular wilt, and Ascochyta blight, caused by Uromyces viciae-fabae, Fusarium oxysporum f. sp. lentis, and Ascochyta fabae f. sp. lentis, respectively, are the key fungal pathogens of lentil. Cultivars with resistance to rust and Ascochyta blight have been released in several countries and resistant sources to vascular wilt are being exploited. Sources of resistance to several other fungal and viral diseases of regional importance are known. In contrast, although the pea leaf weevil (Sitona spp.) and the parasitic weed broomrape (Orobanche spp.), and to a lesser extent the cyst nematode (Heterodera ciceri), are significant yield reducers of lentil, no sources of resistance to these biotic stresses have been found. Directions for future research in lentil on both biotic and abiotic stresses are discussed. 相似文献
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D. A. Bond G. J. Jellis G. G. Rowland J. Le Guen L. D. Robertson S. A. Khalil L. Li-Juan 《Euphytica》1993,73(1-2):151-166
Progress is being made, mainly by ICARDA but also elsewhere, in breeding for resistance to Botrytis, AScochyta, Uromyces, and Orobanche; and some lines have resistance to more than one pathogen. The strategy is to extend multiple resistance but also to seek new and durable forms of resistance. Internationally coordinated programs are needed to maintain the momentum of this work.Tolerance of abiotic stresses leads to types suited to dry or cold environments rather than broad adaptability, but in this cross-pollinated species, the more hybrid vigor expressed by a cultivar, the more it is likely to tolerate various stresses. 相似文献
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Chunli TANG Fengxian ZHAO Hongxia CHEN Jiabao MA Jiangcun WEI Meiyan QIU Zhen XIE 《Medicinal Plant》2019,(6):60-65
[Objectives]To optimize the water extraction process of Chinese Herbal Compound Man Gan Ning and establish a method for its extraction and content determination... 相似文献