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鱼粉的品质和掺伪情况判定 总被引：1，自引：0，他引：1
针对市场中大量出现的掺假鱼粉情况，采用测定氨态氮、消化率、氨基酸含量、显微镜检查等方法分析判定鱼粉的品质和掺伪情况。详细讨论了检测结果中出现的各种情况与鱼粉的品质及掺假物的关系。 相似文献
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针对市场中大量出现的掺假鱼粉情况，采用测定氨态氮、消化率、氨基酸含量、显微镜检查等方法分析判定鱼粉的品质和掺伪情况。详细讨论了检测结果中出现的各种情况与鱼粉的品质及掺假物的关系。 相似文献
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鱼粉价格较贵，质量参差不齐，市场上掺假现象严重，掺入物主要有尿素、水解羽毛粉、血粉、肉骨粉、棉籽粕和菜籽粕等。利用这些掺物与鱼粉在显微镜下的特征的差别可以判断鱼粉质量的好坏，而且方法快速、经济。１掺尿素可以看到鱼肌肉纤维与尿素粘在一起形成的大颗粒及尿素颗粒，压碎后可以见到鱼肌肉纤维和一些粉末。再进一步测定其粗蛋白和真蛋白的含量即可确定。一般进口鱼粉中真蛋白含量应大于８０％，国产鱼粉中真蛋白含量应大于７５％，掺假鱼粉中真蛋白含量一般为５５％～７５％。２掺水解羽毛粉显微镜下可以看到未水解完全的羽小枝… 相似文献
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本文对越南淡水鱼排粉和南美全鱼粉的镜检特征、感官、常规等指标进行比较。其中越南淡水鱼排粉在镜检特征、感官、常规指标与南美全鱼粉都有较大的差异,故对此需结合物理和化学方法进行综合判断与区分,以期更加客观、科学评价越南淡水鱼排粉,供同行参考并提供研究思路。 相似文献
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1鱼粉鱼粉是优质的动物性蛋白质饲料,是各种鱼的整个或部分鱼体加工、干燥、粉碎制成的产品,含脂肪越少,质量越好。鱼粉也是掺假最多的原料,常见的鱼粉掺假主要有：以增加鱼粉重量为目的,掺入豆粕、棉粕、花生粕等;以增加总氮为目的,掺人非蛋白氮如尿素、氯化铵、二缩脲、磷酸脲等;将低质动物蛋白质掺入鱼粉中,如掺入羽毛粉、毛发粉、血粉、皮革粉等;将低质或变质鱼粉掺人好的鱼粉,特别是进口鱼粉中。检测鱼粉品质主要有以下几种方法。 相似文献
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方法 1 镜检 用体视显微镜或普通放大镜 ,直接观察或泡水后观察均可。好鱼粉可看到鱼肉正常的肌肉纤维结构 ,浅黄色 ,用解剖针可分离一条条肌纤维。鱼粉中有一定比例的鱼骨头 ,尤其注意看鱼的脊椎骨。肌纤维较粗、颜色较深者为肉骨粉。看到碎松香块状物为角质蛋白或水解角质蛋白 (如水解羽毛粉、水解蹄角粉等 )。沥青块状物为血粉。细丝状、少骨头多有掺皮粉、皮革粉之嫌。有白头发丝状物、黑褐色块状物并有一面粘附有白发丝状物 ,可判定有棉籽饼粕。发现成粒菜籽或菜籽壳为掺菜籽饼粕。每种物质都有它固有的结构 ,仔细观察不难鉴别。方法… 相似文献
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李志强 《畜牧兽医科技信息》2003,19(7)
识别掺假鱼粉的方法很多,但根本的方法是利用氨基酸值的差异进行识别。 1.掺羽毛粉:羽毛粉水解后变成黄棕褐色颗粒,色形极似鱼粉。掺入水解羽毛粉的鱼粉,不仅丝氨基酸含量高,而且明显高于苏氨酸;而优质鱼粉 相似文献
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本次实验在鱼粉中按不同比例掺入血粉、豆饼，使其达到粗蛋白在掺假前后基本一致。根据国际标准的饲料测定方法，研究掺假前后鱼粉的理化指标变化及定性检测和显微镜检，从而为鱼粉中掺假物质的检测建立一种科学的方法。 相似文献
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合理的开发与利用植物蛋白源已成为解决鱼粉全球性缺乏的重要途径之一。较高比例的植物蛋白源会导致鱼体承受的氧化胁迫加剧,进而造成机体损伤,影响鱼类对植物蛋白源的利用效率。文章对已开展的研究结果进行归纳、分析与讨论,旨在为提高鱼类对植物蛋白源利用研究开拓新的思路。 相似文献
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血红素是血红蛋白、肌红蛋白等的辅基,具有重要的生理功能,在医药、食品等方面得到广泛应用。论文介绍了血红素的冰醋酸提取法,酸性丙酮提取法、羧甲基纤维素提取法、酶解提取法、血粉提取法、有机酸和有机碱混合提取法。 相似文献
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Trout fry were experimentally infected with endoparasites (Anisakis sp.) and/or ectoparasites (Gyrodactylus derjavini). During the following 3 weeks the infection level of G. derjavini was significantly lowered in fish infected with live anisakids compared to fish injected with physiological saline, a corresponding amount of Anisakis protein sonicate or to untreated fish. Subsequent scanning electron microscopy (SEM) of recovered nematodes from the trout showed an extensive colonization of the worms with host macrophages. It is indicated that the activation of the fish immune system by infection with live anisakids influences the skin response of the host with a subsequent negative effect on the ectoparasites G. derjavini. 相似文献
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通过对土地一级市场政府垄断的效应分析，同时结合当前土地一级市场政府垄断问题上的观点，展开对该问题的理论思考，以此进一步认识当前我国土地一级市场的改革问题，指出土地一级市场的改革方向是减少政府对土地一级市场的政府垄断，逐步开放农村集体土地市场，但改革还需要相关配套措施的完善。 相似文献
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Pepe T. Ceruso M. Carpentieri A. Ventrone I. Amoresano A. Anastasio A. 《Veterinary research communications》2010,34(1):153-155
The genus Thunnus comprises many species, some of higher quality and commercial value for their excellent organoleptic features, while others of lower quality and value. Consequently, these species are subjected to frequent fraudulent substitution. Increasing trade in fillet and minced fish makes the identification of external anatomical and morphological features of fish impossible. Proteomics was used for the identification of three Thunnus species. Muscle extracts were evaluated by both mono- and two-dimensional electrophoresis and mass spectrometric techniques. Preliminary results demonstrate that the tested species displays a high degree of polymorphism, making possible an accurate identification.
相似文献18.
The development of Goussia sinensis, a coccidium parasitizing the intestine of the silver carp (Hypophthalmichthys molitrix) was studied by electron microscopy. All stages developed in the epithelial cells, less frequently in the goblet cells, and were located within a parasitophorous vacuole. In some cases one cell was invaded by several merozoites. Eight to sixteen merozoites were formed within the meront by ectomerogony. The ultrastructural processes characteristic of gamogony were the same as those found for Goussia spp. parasitizing other species of fish. A hitherto unknown mechanism of oocyst wall formation was observed. The oocyst membrane developing within the zygote surrounded only part of the zygote material. Thus, a small part of the zygote material left the oocyst proper. It is suggested that this zygote residue and the necrotic host cell constitute the so-called "yellow bodies" which include the excreted oocyst. The oocyst wall was 40 to 60 nm thick. Oocyst sporulation took place within the fish. The sporocysts consisted of two hemispheres connected by sutures and had a 100 to 120 nm thick double wall. They were surrounded by sporocyst veils fixed to the oocyst wall by membranes. 相似文献
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《Journal of aquatic animal health》2013,25(1):7-12
Abstract From 1985 to 1987, outbreaks of a disease resulting in mass mortality occurred in larvae and juveniles of the Japanese flounder Paralichthys olivaceus cultured at prefectural and private hatcheries in Hiroshima Prefecture, Japan. The disease occurred in 10-30-d-old fish that were reared at about 18–20°C, and mortality usually reached 80–90% in a few weeks. The affected fish had opaque fins and a hyperplastic epidermis on the fins and skin. Electron microscopy revealed hexagonal virus particles in the nucleus (100–140 nm in diameter without an envelope) and cytoplasm (190–230 nm with an envelope) of the affected epidermal cells. Although isolation of the causative agent by the use of five fish-cell cultures was not successful, the disease was transmitted to healthy larval flounder by exposing them to a 0.45-μm filtrate of diseased fish homogenate. The agent's morphological features and its sensitivity to ether, to a pH of 3, and to a 30min exposure to 50°C indicate it is a herpesvirus. 相似文献