共查询到20条相似文献，搜索用时 46 毫秒
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蛋清粉作为鲜蛋清的替代品,具有便于储存、运输以及工业生产等优点。蛋粉的干燥方法很多,如热风干燥、喷雾干燥、真空冷冻干燥、远红外干燥、微波干燥等,但多以喷雾干燥为主。本试验对蛋清粉的喷雾干燥条件进行了调整,研究不同喷雾干燥流量、进料温度、进风温度对蛋清粉最终成品的溶解性和分散性的影响,优化工艺参数,使得最终得到冲调性良好的蛋清粉。结果表明,喷雾流量4.0 mL/min,进料温度在40℃,进风温度170℃时蛋清粉的含水量为4.46%,颗粒大小为60目,溶解度为96.87%,分散性为50.13 s,冲调效果最好。 相似文献
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《中国家禽》2018,(24)
将巴氏杀菌蛋清液在4℃下冷藏0～13 d,测定储藏期间蛋清液起泡性和凝胶性的变化。结果表明:在冷藏期间,蛋清液起泡性先下降后上升,鲜蛋的起泡性为0.691,第9天蛋清液起泡性达到较低值0.283,较鲜蛋样降低59.04%;泡沫稳定性先上升后下降,鲜蛋泡沫稳定性为0.926,冷藏第8天达到较大值0.955,较鲜蛋样增高3.13%;凝胶强度呈波浪式变化,鲜蛋液凝胶强度为935.095 g/cm~2,第4天达到较低值540.282 g/cm2,较鲜蛋样降低42.22%,第11天达到较大值1 408.763 g/cm~2,较鲜蛋样增加50.65%;凝胶弹性也呈波浪式变化,第5天和第10天凝胶弹性较大,分别为1.579和1.908。由此可知,蛋品加工若要利用起泡性,不应将蛋清液冷藏;若要利用泡沫稳定性,需在4℃适当冷藏,并综合考虑其起泡性;若要利用凝胶强度,应在4℃冷藏11 d后再进行加工;利用凝胶弹性需在4℃冷藏5或10 d。 相似文献
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糖基化改善蛋清蛋白功能性的研究 总被引：3，自引：1，他引：2
试验研究了糖基化对蛋清蛋白功能性的影响.糖基化蛋清蛋白是通过将蛋清蛋白一麦芽糊精混合物在60 ℃,65%相对湿度条件下反应0～5 d制得.糖基化蛋白粉溶解性在反应前期(0～3 d)变化不明显,反应4～5 d溶解性有所降低.糖基化蛋白较未改性的蛋清蛋白在热稳定性、凝胶性、乳化性、起泡性方面都得到了显著提高.本研究的结果表明糖基化方法是提高蛋清蛋白功能性的一种有效途径. 相似文献
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研究通过监测不同温度(25℃、4℃)储藏鸡蛋蛋液pH值、起泡性和泡沫稳定性随时间的变化,分析储藏时间对蛋清液起泡性的影响。结果显示:鲜蛋于常温25℃条件下放置29 d,全蛋液p H值先由6.8升至7.7后逐渐降低,蛋清液起泡性随储藏时间的延长先升高后降低,起泡性初始值为107.8%,储藏25 d后达到421.2%,之后逐渐降低;4℃下储藏的样品起泡性变化规律与常温相似,储藏17 d后达到270.9%。研究表明:在使用鸡蛋生产焙烤食品时,选用4℃储藏2周或25℃储藏1周的鸡蛋较好。 相似文献
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蛋清粉凝胶性与凝胶稳定性的研究 总被引：2，自引：1，他引：1
研究蛋清粉在贮藏期间所成凝胶的质构、持水性以及微观结构的变化。结果显示,蛋清粉的凝胶硬度、弹性、粘结性、持水性分别为346g/cm2、0.905、0.382、52.00%,25℃下贮藏180d后,蛋清粉的凝胶硬度与粘结性较贮藏初期并无显著性变化(P>0.05),而凝胶弹性与持水性与贮藏初期相比差异性显著(P<0.05)。蛋清粉的溶解性随贮藏时间的延长呈下降趋势,但降幅很小,25℃下贮藏180d时与贮藏初期相比无显著性差异(P=0.154)。500倍扫描电镜(SEM)下观察蛋清粉所成凝胶,其结构空隙很大,分布疏松,随贮藏时间的延长无明显变化。研究结果表明,贮藏时间与温度对蛋清粉的溶解性影响很小,而对蛋清粉的凝胶性影响较大,含水量是影响蛋清粉凝胶稳定性的重要因素。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献
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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献