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黑莓优良品种果汁加工性能的研究 总被引:8,自引:0,他引:8
通过对黑莓鲜果取汁方法的比较、酶法液化技术的实验研究以及黑莓不同品种果汁出汁率、可溶性固形物含量的调查,结果表明:采用酶法液化榨取黑莓汁,出汁率高,品质好;酶法液化处理黑莓果浆泥,果胶酶用量0.05%左右(果胶酶活力为20000u/g),酶解时间1.5h左右,酶解温度50℃左右,效果最好;黑莓品种间果汁含量差异显著,总的来看,纯黑莓品种果汁出汁率高,黑莓与树莓杂交品种果汁出汁率低;黑莓属于偏酸水果,pH在3.0左右,鲜果可溶性固形物含量品种间差异大。 相似文献
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本文研究了采用酶解法处理火龙果果浆的影响效果,并以火龙果果浆处理后的黏度和出汁率为指标,探讨最佳工艺条件。先进行单因素实验确定温度、时间、酶的添加量、pH值的最适取值范围,再通过试验确定单一酶和复合酶种类的最佳选择,最终使用L9(34)正交试验确定火龙果果浆液化的最佳工艺条件,并对最佳工艺条件进行验证。研究表明,在温度为50℃、时间为45 min、各种酶的添加百分含量为0.07%、pH值为4.3的条件下,用果胶酶、纤维素酶和半纤维素酶组成的复合酶处理新鲜火龙果果浆为最佳的工艺条件,处理后的火龙果果浆黏度大幅下降,出汁率明显提高,黏度较空白对照下降170.5 mPa·s,出汁率提高14.8%,且色泽口感保持良好,且作为调配饮料原料酸度在可接受范围内。 相似文献
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响应面法优化猕猴桃果浆酶解工艺参数研究 总被引:2,自引:0,他引:2
本文研究果胶酶反应温度和作用时间及酶用量对猕猴桃果浆出汁率、果汁澄清度和乙醇不溶物的影响,采用通用旋转设计和响应面分析猕猴桃果浆酶解最优条件。结果表明,猕猴桃果浆的最佳酶解条件为:反应温度为45℃,作用时间为113min,果胶酶用量为0.013%,在此条件下,猕猴桃果浆预测出汁率达到83.30%,乙醇不溶物0.98g/100ml,果汁的澄清度为81.47%。验证试验表明,响应面优化后得到猕猴桃果浆出汁率、果汁澄清度和乙醇不溶物回归方程的相关系数分别为0.958、0.904和0.922。 相似文献
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《食品工业科技》2016,(22)
以宁夏枸杞鲜果为原料,经打浆与护色后,用不同酶制剂进行酶解处理,结合酶量、反应温度、反应时间及底物p H,考察对枸杞出汁率和可溶性固形物的影响。经单因素和Box-Behnken优化实验,确定枸杞浆最佳酶解工艺。实验确定的果胶酶酶解最优条件为:果胶酶添加量0.016%,温度41℃,酶解时间1.3 h,枸杞浆出汁率为48.75%。复合酶酶解最优条件为:复合酶(果胶酶∶纤维素酶=3∶7)添加量0.09%,酶解温度35℃,酶解时间2.7 h,枸杞浆出汁率为49.20%。且两种酶对可溶性固形物无显著性影响(p0.05)。结果表明:果胶酶及复合酶均能大幅度提高枸杞果的出汁率,但复合酶比单一果胶酶对提高枸杞果出汁率效果更好。 相似文献
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以市售和田大枣为原料,利用果胶酶处理红枣浆,以提高红枣浆出汁率。通过单因素试验得到在酶解温度30℃~50℃范围内、酶解pH 4.5~5.5、果胶酶添加量0.01%~0.03%、酶解时间60 min~80 min红枣浆出汁率较高,酶解效果较好;通过正交试验得到果胶酶处理红枣浆最佳工艺条件为酶解温度40℃,酶解pH 5.5,果胶酶添加量0.03%,酶解时间60 min,此条件下红枣浆出汁率为87.5%,比未添加果胶酶进行酶解提高了19%。 相似文献
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以梅县沙田柚为原料,利用果胶酶处理柚果浆,考察酶解温度、酶解时间及酶添加量对果浆出汁率的影响,优化沙田柚果浆酶解工艺条件。结果表明,最佳酶解条件:酶解温度40~45℃,酶解时间3h,酶添加量75~100mg/L,此时出汁率在80%以上;比较酶解前后果汁的营养成分的变化,果汁可溶性固形物提高了0.6 oBix,还原糖含量由9.418g/L提高到10.30g/L,出汁率提高了18.23%,果汁黏度由30mPa.s显著下降至2mPa.s,VC损失率为28.2%,同时果汁透光率也显著提高,而对果汁总酸、pH值等基本无影响。 相似文献
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针对黑莓果汁加工过程中存在的出汁率低、品质不稳定等问题,运用响应面法研究超声波辅助复合酶(果胶酶+果浆酶)制备黑莓清汁的优化工艺条件,并对超声波辅助酶解提高黑莓果汁品质的协同效应进行解析。结果显示,超声辅助酶解制备黑莓清汁的最佳工艺条件为超声功率200 W、加酶量0.3%、酶解时间1.5 h、酶解温度45 ℃,在此优化条件下制备的黑莓清汁具有较高的出汁率(80.89%)和透光率(68.21%),对其品质和色泽稳定性分析得出,其花色苷含量和总酚含量明显高于单一酶解组,且色泽呈红色,在贮藏过程中具有较好的稳定性。采用扫描电子显微镜对处理后原料进行观察,结果表明,超声与酶产生协同效应,加速原料组织结构的破坏,提高黑莓清汁的制备效率。 相似文献
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Antonio J. Pérez-López Felipe Beltran Marta Serrano-Megías Domingo Saura López Ɠngel A. Carbonell-Barrachina 《European Food Research and Technology》2006,222(5-6):516-520
The most natural way of improving the color of orange juices is by adding other juices, which provide a more intense coloration.
The US legislation allows the addition of up to 10% of mandarin juice to the orange juice to improve its color. The first
objective of this study was to compare the color characteristics of juices from 11 mandarin cultivars, currently being grown
in Spain. Experimental results proved that only the green-red coordinate, a*, of the orange juices can be improved by adding mandarin juice. The mandarin cultivar that provided a juice with the highest
values of a* was Clemenules. Once this selection was made, the effects of adding mandarin juice at different ratios, up to 10%, on the
color characteristics of the orange juice were studied. Values of the a* coordinate went from 5.50 for the pure orange juice up to 6.29 for the mixture of 90% orange juice plus 10% of mandarin
juice. Finally, hedonic tests proved that regular juice consumers preferred the color of mandarin juice to that of orange
juice and that they liked better the color of the juice mixture containing 10% mandarin juice than that containing 3% mandarin
juice. 相似文献
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《中外食品工业信息》2012,(9):44-44
关键字:口味独特 香蕉口味甘美.但若做成饮料实属不易。这是因为香蕉本身无法榨取,只有添加其它液体调配而成。目前市面上所见届多的是香蕉口味的牛奶饮品,但事实上,香蕉饮料也有果汁饮料了。 相似文献
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A method has been developed to detect the adulteration of pear juice with apples and apple juice with pears. In different varieties of apples and pears and in several commercial juices the flavonoids were examined by HPLC with respect to their quality and quantity. The chalcones phloretin glucoside and phloretin xyloglucoside are typical compounds found in apples (detection limit 7 ng). They are suitable indicators for detecting adulteration of pear juice with apples. Isohamnetin glucoside cannot be detected in apples (detection limit 10 ng), but can be used to detect pears in apple juice. The extract or juice was purified with the aid of a polyamide column. The evaporated eluate of methanol was analysed by HPLC (gradient: acetonitrile/1% acetic acid). An RP-18 column and a UV-detector were used. Additionally, the UV spectra of the compounds indicating an adulteration were recorded by a diode array detector. 相似文献
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《Journal of food engineering》1987,6(4):257-267
This paper reports the rheological behaviour of apple juice and pear juice. The effect of temperature on this behaviour for concentrated apple juice and pear juice of 71°Brix and 70°Brix, respectively, is examined and equations are given to describe the change in viscosity with temperature within the temperature range 5–60°C. The rheology of apple juice and pear juice of different soluble solids concentrations at 25°C is likewise reported with equations to relate the change in viscosity with concentration within the concentration range studied. In all these cases these juices are Newtonian in behaviour. 相似文献