超高效液相色谱法测定番茄中番茄红素含量

文章建立了一种利用超高效液相色谱测定番茄中番茄红素含量的方法。2.00 g样品加入10 mL丙酮,涡旋混匀提取10 min, 4℃10 000 r·min^(-1)离心5 min,取上层清液过0.22μm微孔滤膜,上机检测。结果发现,番茄红素在1.00~100.00μg·mL^(-1)浓度范围呈良好的线性关系,加标回收率为91.2%~106.7%,相对标准偏差(RSD)为2.8%~5.1%。该方法可以节省大量的时间和试剂,使前处理更简单,更经济,更环保。

浙江省温州市生猪屠宰环节检疫检验结果统计与分析

以2015—2017年浙江省温州市区屠宰厂的屠宰检疫数据为基础,统计分析屠宰生猪的检疫检验情况。结果显示:在150余万头屠宰生猪中,共检出不合格猪6 482头,不合格检出率为0.43%。其中,宰前、宰后不合格猪分别为3 385、3 097头,分别占不合格总数的52.22%和47.78%。宰前检疫中,检出死猪3 105头,占宰前不合格总数的91.73%;宰后检验中,检出猪丹毒、猪肺疫等病猪807头,检出品质不合格猪2 290头,分别占宰后不合格总数的26.06%和73.94%。7、8月份检出的死猪数量明显较多,月检出率超过0.50%。结果表明:长途运输引起的屠宰生猪死亡数量较多,尤其是夏季高温季节;疫病导致的宰后检疫不合格数极少;厂方品质检验对严把猪肉安全上市至关重要。因此,改善运输条件、加强宰后品质检验,对于保障猪肉供给和卫生安全有着重要作用。

2016-2017年温州市地产蔬菜农药残留监测结果与分析

为了解温州市地产蔬菜农药残留状况,为蔬菜监管和食品安全提供依据。从2016-2017年温州市462个蔬菜生产主体随机抽取1465份样品,采用部颁标准对33种农药残留项目进行检测。结果:19种农药有不同程度残留,检出样本403份;7种农药有超标,超标样本14份。样品农药残留检出率27.51%,超标率0.956%;检测项目农药残留检出率1.107%,超标率0.029%。蔬菜农药残留检出率以茄果类最高,达46.64%;超标率以叶菜类最高,为1.333%,根茎类、甘蓝类、豆类未见超标。农药检出率最高是腐霉利,检出率为17.82%;超标率最高是腐霉利和毒死蜱,均为0.27%。对蔬菜农药残留监测基本数据分析表明,温州市地产蔬菜的合格率在99%以上,总体状况良好,但个别不规范使用农药现象仍有存在,需要引起高度重视。应当加强对蔬菜种植环节的监测与安全管理,确保市民吃上安全放心蔬菜。

Influence of Sows Farrowing Performance on Growth of 21-Day-Old Weaned Piglets and Their Correlation Research

[ Objective ] To study the influence of sows farrowing performance on the growth of 21-day-old weaned piglets and their correlation. [ Methods ] A total of 1 350 Duroc x Landrace Yorkshire piglets produced by 2-6 fetal Landrace x Yorkshire sows from 118 litters within a month were selected to be the test objects. All the newborn piglets were lactated by their parent sows. The test groups were divided according to different numbers （6 - 17） of live birth. The variance analysis were conducted on birth weight, litter weight at birth, number of 21-day-old weaning piglets, weaning weight, weaninl2g weight of litter, weaning survival rate and relative individual weight gain among different weeks. [ Results] Sows farrowing performance had significant influence on the growth performance of 21- day-old piglets. However, the influences among different traits varied, some were even on the contrary. With the increase of the number of live birth, the birth weight, weaning weight of litter and weaning survival rate showed a decline trend. And when the number of live birth was equal or more than 14, the weaning sur- vival rate dropped to below 90% （P 〈 0.01 ） ; when the number of live birth was 13, the litter weight at birth and weaning weight of litter reached the peak. What- ever the number of live birth increased or decreased, the weaning weight showed a regular decline trend. [ Conclusions] When the number of live birth changed from 11 to 13, the maximum values of the economic indicator （weaning weight of litter） and the technical specifications （weaning survival rate） were achieved.