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生物保鲜技术在果蔬贮藏保鲜中的应用 总被引:4,自引:0,他引:4
果蔬贮藏保鲜的发展,具有显著的经济效益和社会效益。生物技术在果蔬贮藏保鲜上的应用是近年新发展起来的具有发展前途的贮藏保鲜方法。本文概述了果蔬贮藏保鲜的原理和技术,同时对生物保鲜技术在果蔬贮藏保鲜中的应用进行了探讨。 相似文献
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韶关市工业科学研究所于1984年进行了葡萄贮藏保鲜技术的研究。经过两年多的研究试验,现已取得了较大进展,该所研制出对葡萄贮藏保鲜有明显效果的防脱果剂和SM—CY保鲜剂,探索了一整套对葡萄贮藏保鲜行之有效的技术方法。现将有关结论简介如下: 相似文献
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纳米SiO2/PP复合保鲜膜的制备与性能研究 总被引:2,自引:0,他引:2
以PP薄膜为基材、表面涂布纳米SiO2溶液,利用等离子体处理制备出SiO2/PP复合保鲜薄膜.通过红外、扫描电镜对复合保鲜膜的结构进行了分析,发现在等离子体的作用下,涂覆在薄膜表面的SiO2:与PP发生反应生成了Si-O-C结构;SEM表明,涂覆在薄膜表面的SiO2在等离子体的作用下呈现较为规则排列的迷津结构.透湿性能、拉伸强度和摩擦性能测试表明,与纯PP相比,复合保鲜薄膜的透湿率降低,拉伸强度增大,摩擦因数减小.利用该保鲜薄膜对草莓进行包装,考察对保鲜效果的影响,发现草莓在贮藏到第13 d时,失重率为6.9%、腐烂指数为19%、有机酸含量(质量分数,下同)为0.28%、可溶性同形物为6.1%、维生素C(Vc)含量为0.42 mg/g,保鲜效果优良. 相似文献
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F. Comes M. Farines A. Aumelas J. Soulier 《Journal of the American Oil Chemists' Society》1992,69(12):1224-1227
Cherry seed oil, from the Rosaceae family, prunoid subfamily, is characterized by the existence of about 10% α-eleostearic
acid. The structure of the acid was proven by H and13C nuclear magnetic resonance. The triacylglycerols of this oil were identified and quantitated by highperformance liquid chromatography
by means of several types of detectors. α-Eleostearic acid was not found in the seeds of previously studied prunoids (almond,
peach, apricot and plum). The main fatty acids found in the seeds of cherry and other prunoids were linoleic (L), oleic (O)
and palmitic acids, and the major triacylglycerols were LLO, LOO and OOO. These chemical data support the botanical relationship
within the prunoid subfamily and show the proximity of cherry to the Chrysobalanaceae family. 相似文献
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In laboratory assays, we investigated responses of female plum curculios (PCs),Conotrachelus nenuphar (Herbst), to host and nonhost fruit or leaf odor when PCs were crawling on experimental tree branchlets or twigs. In choice tests where test specimens were hung from the ends of a wooden crosspiece, PCs made significantly more visits to host plum fruit than to plum leaves, nonhost tomato fruit, wax models of plum fruit, or blanks (wire). In similar tests, PCs made significantly more visits to plum leaves compared to nonhost maple leaves or to blanks. PCs in test chambers that contained host or nonhost odor were significantly more prone to feed on wax plum models in the presence of odor from host fruit or host leaves compared to odor from nonhost fruit or leaves or a water blank. In choice tests offering alternating cluster types on an apple branchlet, PCs visited leaf clusters bearing a host apple fruit more than leaf clusters without a fruit. In tests to assay the distance at which PCs can detect an individual host fruit, PCs crawled from the central stem of an apple branchlet onto a side stem significantly more often when an apple fruit on a side stem was hung 2 cm from the central stem compared to 4 or 8 cm away. Our combined results suggest that PCs use host fruit odor to locate host fruit at close range. 相似文献
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化学镀Ni-P合金在食品中耐蚀行为研究 总被引:1,自引:0,他引:1
本文在确定化学镀Ni-P合金工艺条件的基础上,用静态失重法探讨了镀层在苹果汁,酸白菜,西红柿汁,白醋,茶等五种食品中腐蚀速度。用X射线衍射和阳极极化曲线分析了热处理对镀层耐蚀性的影响。结果表明:Ni-P合金在上述几种食品中耐蚀性较好,经预镀的镀层耐蚀性比.未预镀的镀层耐蚀性更好,镀层经热处理后耐蚀性反而下降。 相似文献
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采用湿式超微粉碎加工工艺,以悬浮率、热贮稳定性、包衣均匀度和脱落率为标准,用流点法筛选合适的梳形高分子分散剂和类双子型分散剂,通过对不同润湿分散剂、成膜剂以及增稠稳定剂和防冻剂的筛选,得到了500 g/L噻虫嗪悬浮种衣剂的优化制剂配方为40%噻虫嗪,4%YUS-SC3,2%YUS-WG5,1%YUS-WG4,2%尿素,0.1%黄原胶,0.5%硅酸镁铝,0.1%消泡剂,水余量。经实验,其成膜性良好,脱落率<4%。包衣后的玉米种子,其发芽率97%,种衣剂对种子发芽率的影响<1%。 相似文献
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Tomato concentrate and baker's yeast suspension were dried in the laboratory scale Mechanically Spouted Bed dryer with inert packing. Due to a large contact surface provided by the inert particles, very fast drying process can be achieved, ifthe thickness of the wet coating formed on the surface of the inert packing is film-like. The diffution resistance can be then considered negligible and drying can be performed at “quad-constant” rate. Derived fiom hydrodynamic characteristics the contact time between hot air and the wet coating is very short, therefore gentle drymg process can be performed. The quality of the dried yeast was controlled by counting the living cells (relative viabilny) and by measurement of the dough rise time. During continuous drying of thermoplastic tomato pure the “case hardening” periods could be shortened and tomato powder with insignificant quality loss was produced. 相似文献
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集装箱箱底涂料流变性能的研究 总被引:2,自引:0,他引:2
为提高厚防腐涂层的流变性能,在涂料中加入不同种类及含量的触变剂,优选出最佳触变剂,即2%改性聚酰胺和1%膨润土,通过不同剪切速率下的涂料粘度的测量,推导出Casson公式。结果表明,触变剂的加入能满足集装箱底涂料对流变性的要求。 相似文献
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为了开发出长寿命高稳定性镁合金化学镀镍溶液,通过添加硫脲、碘酸钾等稳定剂,研究了pH值、温度对镀液的稳定性能、镀速、镀层质量等因素的影响。采用称重法测定镀层的沉积速率,沉积到镀件上的镍量占溶液中消耗镍量的百分比来表示溶液的稳定性,NaCl溶液浸泡实验评定镀层的覆盖度,热震实验评定镀层的结合力,极化曲线表征镀层的耐蚀性。 结果表明,沉积速率随硫脲、碘酸钾浓度的增大先升高后降低,碘酸钾对镀速的影响不如硫脲显著。添加硫脲0.5 mg·dm-3时稳定常数最大值达89.25%,添加碘酸钾 5 mg·dm-3时,稳定常数达82.45%。采用pH值为5.0的含硫脲的镀液,(82±1)℃施镀,获得的Ni-P镀层和镁合金基体之间没有缝隙,结合紧密,而且Ni-P镀层均匀致密。硫脲不仅能提高沉积速率,而且也催化镁合金表面,提高沉积效率。 相似文献
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采用赫尔槽和方形槽电解试验,研究了三价铬硫酸盐溶液镀硬铬时乙酸、甘氨酸.柠檬酸钠、草酸钠、苹果酸等辅助配位剂对镀铬层外观,厚度和镀速的影响.结果表明,辅助配位剂有利于改善镀层质量和得到光亮镀层,但平均镀速和镀层厚度明显减小.辅助配位剂的种类及添加量都会影响三价铬的电沉积过程.以0.4 mol/L甘氨酸作为辅助配位剂时,高电流密度区不漏镀,也不出现雾带,电流密度范围达到4.5~32.0A/dm2,可得到整体光亮的合格镀层;以0.10 mol/L苹果酸作为辅助配位剂时,在电流密度为9 A/dm2的条件下持续电解20 min,可得到7.33μm厚的合格光亮镀层,镀速为21.96μm/h. 相似文献