共查询到18条相似文献,搜索用时 234 毫秒
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在六二式麦棉套种的基础上增种一茬冬菠菜和一茬西瓜,既可提高土地利用率,又充分利用光热资源,增加经济效益。根据试验,土地利用率(LER)提高37.5%,光能利用率(E)提高69.7%,生长季节利用指数(TUI)提高53.4%,单产值增加1188.0元/667m^2,比对照提高69.0%。 相似文献
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大豆分离蛋白膜的制备及相关因素分析 总被引:1,自引:0,他引:1
以大豆分离蛋白为原料,研究了大豆分离蛋白(SPI)百分含量、大豆分离蛋白(SPI)与甘油的比例、pH 值、加热温度对大豆分离蛋白膜特性的影响。确定最佳制备工艺为SPI百分含量为5%、SPI与甘油的比例为5:2、pH为9、热处理温度为90℃,在最佳条件下制备的大豆分离蛋白膜各指标为:水蒸汽透过系数为71.96 g?mm/m2?h?kPa,抗拉负荷为16.33N,吸水率为0.409%,透光率为64.2%。 相似文献
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《农产品加工.学刊》2017,(21)
以乳清蛋白和壳聚糖为原料制备复合膜,同时利用天然无毒的京尼平作为交联剂,研究其制备工艺。通过单因素试验研究成膜材料比例、热处理温度、塑形剂、交联剂对乳清蛋白和壳聚糖复合膜性能的影响,并对复合膜进行表征和抑菌性研究。结果表明,京尼平可以作为交联剂用来制备乳清蛋白和壳聚糖复合膜,并且可以较好地改善复合膜的拉伸性能和阻隔性能,膜制备的最佳工艺条件是乳清蛋白(WPC)与壳聚糖(CS)配比为6:4,甘油添加量4%,热处理温度70℃,京尼平添加量0.4%,此时复合膜的拉伸强度(TS)1.79 MPa,断裂伸长强度(E)30.28,透光率(T)37%,水蒸气透过率(WVP)1.25,溶解性(S)34%。在此条件下制得的复合膜具有良好的阻隔性能、抗拉强度、致密性和抑菌性能,可用于食品保鲜和抗菌内外包装的使用。 相似文献
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纳米SiOx对青椒常温贮藏保鲜的影响 总被引:1,自引:0,他引:1
以鲜青椒为试材,在常温条件下,以不作任何处理为对照,研究1-MCP、壳聚糖膜剂(壳聚糖含量1.5%,脱氢醋酸钠含量0.05%)和纳米SiOx壳聚糖膜剂处理对青椒果实贮藏保鲜的效果。结果表明,纳米SiOx壳聚糖膜剂对青椒的保鲜效果最佳,其次为壳聚糖膜处理,再次为1-MCP处理。与对照相比,青椒呼吸强度降低10.56mgCO2/kg·h,VC含量保存提高10.92mg/100g;还原糖含量保存提高1.36mg/100g,好果率提高39%;失质量率降低0.397%,腐烂率降低38.6%。说明应用纳米SiOx涂膜方式进行常温青椒保鲜,有促进其保鲜的作用。 相似文献
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改性壳聚糖纳米TiO2复合保鲜膜透性的研究 总被引:4,自引:0,他引:4
利用TiO2对壳聚糖进行改性,优化壳聚糖纳米TiO2复合膜,检测纳米TiO2添加量对复合膜的透性的影响,并对嫩姜进行涂膜保鲜。结果表明:当壳聚糖含量为1g,纳米TiO2为0.03g,冰乙酸为1mL时,优化膜透O2系数为0.0437g/d,透CO2系数为0.2702g/d,透O2系数比空白膜增强了4倍,透CO2系数降低了24%,透光率有所降低。应用于嫩姜保鲜时,经优化膜处理嫩姜的Vc、姜辣素含量比不涂膜的嫩姜提高了23%、26%,故改性壳聚糖纳米TiO2复合保鲜膜有利于延长果蔬采后贮藏的保鲜时间。 相似文献
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通过改性纳米TiO2,并对其进行表征后将改性后的纳米TiO2添加到壳聚糖复合保鲜膜中,以期提高复合膜的性能及抑菌效果,延长复合膜对果蔬的保鲜时间。研究结果表明:改性后的纳米TiO2的晶型和结构发生一定变化,添加到保鲜膜中后,优化复合膜比空白膜的透CO2系数降低了24%,透水率降低了65.5%,抗拉强度、撕裂强度、断裂伸长率分别提高了13.99%、57.89%和50%,紫外光区透光率得到改善,抑菌作用被增强,纳米TiO2复合保鲜膜对果蔬的保鲜时间在一定程度上得到延长。
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壳聚糖复合涂膜对杏鲍菇保鲜效果的研究 总被引:3,自引:1,他引:3
【研究目的】杏鲍菇在采后易失水褐化等原因降低食用及商品价值,为延长其货架期,需筛选出适于杏鲍菇的壳聚糖复合涂膜。【方法】该实验以杏鲍菇(Pleurotus eryngii)为研究材料,在室温(22±2℃)条件下,以去离子水浸涂杏鲍菇为对照,采用不同的壳聚糖复合涂膜处理进行保鲜实验,通过L9(33)正交试验筛选杏鲍菇保鲜的最佳复合涂膜配方,并研究其生理效应。【结果】结果表明,与对照相比,筛选出的最佳壳聚糖复合涂膜液能够有效降低杏鲍菇的褐变程度与含水率,延缓游离氨基酸含量、可溶性蛋白含量、可溶性总糖等各指标的变化幅度,保鲜效果达到显著水平(P<0.05)。【结论】适于杏鲍菇的壳聚糖复合涂膜的配比为1.5%的壳聚糖+1.0%的乙酸+0.03%的吐温20+3.0%的甘油,该涂膜起到延缓杏鲍菇采后衰老,保持较好的营养价值和加工风味,达到保鲜目的。 相似文献
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利用保鲜剂对鲜切苹果块进行涂膜处理,研究了涂膜保鲜对鲜切苹果块的保鲜效果.以硬度、失重率为主要指标,结合感官评定,研究了羧甲基纤维素钠、柠檬酸、氯化钙、山梨酸钾添加量对鲜切苹果保鲜效果的影响,并通过正交试验进行配方优化,得出可食性涂膜对鲜切苹果块品质影响的最佳工艺参数.结果表明,可食性复合膜的最佳工艺配方为:羧甲基纤维素钠3.0%,柠檬酸0.6%,氯化钙0.25%,山梨酸钾0.5%,该条件下涂膜处理能够获得表面光亮、无褐变、无斑点、无腐烂、清脆爽口的鲜切苹果块,在50 h内不发生褐变和变质,保持一定的硬度,无明显失重,色泽、口感良好.试验结果显示,可食性涂膜可以有效延长鲜切苹果块的保鲜时间,且能保持较好状态,并可用于其他水果的保鲜. 相似文献
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以低密度聚乙烯、高密度聚乙烯、聚丙烯膜为包装材料,研究其对鲜切苹果的保鲜效果。结果表明:3种保鲜膜包装均能不同程度地抑制鲜切苹果呼吸强度,推迟呼吸高峰期到来,减少营养物质消耗,0.04mmLDPE保鲜膜较适合于鲜切苹果的自发气调包装。 相似文献
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《Postharvest Biology and Technology》2006,39(1):84-92
The effect of antioxidant type and content alone or in combination with edible coatings for fresh-cut apples was studied. Edible composite coatings were prepared from whey protein concentrate (WPC) and beeswax (BW). Ascorbic acid (AA) at 0.5% and 1% content, cysteine (Cys) at 0.1%, 0.3% and 0.5% content, and 4-hexylresorcinol (4-hexyl) at 0.005% and 0.02% were incorporated in the formulations as antioxidants. Apple pieces were coated with the emulsion coatings and weight loss, color (CIE L*, a*, b*, and browning index (BI)) and sensory evaluation were measured during storage. Results showed that incorporation of the antioxidant to the coating reduced browning compared to the use of the antioxidant alone. 4-Hexyl was the least effective at reducing browning, even when incorporated into the WPC-based coating. Increasing AA and Cys content decreased browning of coated samples. The most effective treatments were WPC–BW-based coatings with 1% AA or 0.5% Cys. Apple pieces treated with 0.3% and 0.1% Cys aqueous solutions showed a pinkish-red appearance, whereas this effect was not shown when similar levels of Cys were incorporated into the WPC–BW-based coating. Coating application did not reduces weight loss in fresh-cut apples, probably due to the high relative humidity of the product. A sensory panel was able to discriminate between samples coated with WPC–Cys and samples dipped in Cys aqueous solution, but not between samples coated with WPC–AA and samples dipped in AA aqueous solution. 相似文献
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Effect of ultraviolet-C light on quality and microbial population of fresh-cut watermelon 总被引:4,自引:0,他引:4
The influence of ultraviolet (UV-C) light (1.4–13.7 kJ m−2 at 254 nm) on the quality and microbial populations of fresh-cut watermelon [Citrulus lanatus (Thunb.) Matsum. and Nakai] was investigated and compared to that of common sanitizing solutions used for fresh-cut produce. Dipping cubes in chlorine (40 μL L−1) and ozone (0.4 μL L−1) was not effective in reducing microbial populations and quality was lower in cubes receiving these aqueous treatments compared to UV-irradiated cubes or control. In commercial trials, exposing packaged watermelons cubes to UV-C light at 4.1 kJ m−2 produced >1 log reduction in microbial populations by the end of the product's shelf life without affecting juice leakage, color and, overall visual quality. In further experimentation, lower UV-C dose (1.4 kJ m−2) reduced microbial populations to a lower degree and only when complete surface exposure was ensured. Higher UV-C doses did not show any difference in microbial populations (6.3 kJ m−2) or result in quality deterioration (13.7 kJ m−2). Spray applications of hydrogen peroxide (2%) and chlorine (40 μL L−1), without subsequent removal of excess water, failed to further decrease microbial load of cubes exposed to UV-C light at 4.1 kJ m−2. When properly utilized, UV-C light is the only method tested in this study that could potentially be used for sanitizing fresh-cut watermelon. 相似文献