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果汁饮料中原果汁含量的检测鉴定 总被引:1,自引:0,他引:1
果汁饮料中原果汁含量多少是果汁饮料的主要质量指标。本试验采用国际中电们滴定法测定了氨基态氮和态果汁含量的相关性。并对此方法进行深入探讨和评估,认为通过测定果汁饮料氮基态氮含量以判断原果汁含量是可行的。 相似文献
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甜型黄酒在常温陈酿过程中不断进行美拉德反应产生5-羟甲基糠醛(5-hydroxymethylfurfural,5-HMF),为探究其5-HMF的生成规律,采用高效液相色谱法检测了江浙地区不同陈酿年份的甜型黄酒。结合甜型黄酒中理化指标分析两者相关性,并通过甜型黄酒模拟体系分析各理化指标与5-HMF形成的关系,发现在甜型黄酒中随着时间的延长其5-HMF含量不断增加,其还原糖含量、氨基态氮的含量及pH值逐渐上升,总酸含量逐渐减少;5-HMF与还原糖含量及氨基态氮含量、pH值和总酸含量分别在0. 05和0. 01水平(双侧)上显著相关;5-HMF含量与葡萄糖含量及乳酸含量呈正相关、与pH值呈负相关,与氨基酸含量呈先升后减的关系。证明在甜型黄酒中醛糖作为反应底物必不可缺,并且在酸性条件下体系才能生成5-HMF;少量氨基化合物会增加5-HMF含量,但过量可能会减少其含量。 相似文献
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果汁含量是果汁的一项重要指标,但目前果汁含量检测方法还不完善,即使有一些检测方法,检测手段也比较繁琐、费时,同时费用较高。对于同一种果汁而言,果汁缓冲能力与果汁的含量呈线性相关关系,但同一类水果不同品种之间缓冲能力是否存在差异以及缓冲能力与水果的那些内在指标密切相关还不清楚。作者选择了南丰蜜桔,砂糖橘、皇帝柑和平远脐橙4种柑桔类水果,制备了相应的柑桔汁,并分别采用检测添加柠檬酸后H+浓度变化的方法检测了其果汁的缓冲系数,采用凯氏定氮法检测了其果汁中氮含量,采用灰化法检测了其灰分质量分数,结果显示这4种柑桔汁缓冲系数与氮含量和灰分呈二元线性相关,回归方程的建立能为利用缓冲能力检测果汁含量的方法提供理论依据。 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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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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<正> 对刚刚跨入21世纪的中国食品工业界来说,汇源老总朱新礼无疑是一颗引人注目的新星。他艰苦创业,10年拼搏,在取得骄人业绩后,却宁愿放弃公司董事长的位置,与屯河合作,可谓惊人之举。当时记者就曾在《中国食品工业》2002年第八期撰文介绍:尽管有很多人都不看好汇源跟新疆屯河之间的合作,认为朱新 相似文献
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《中外食品工业信息》2012,(9):43-43
“饮料市场风云变幻,让经销商与消费者不断尝鲜必然是好事,但没有一个产品能稳固它的市场。本期流行前沿对几款饮料进行点评,是看中了他们其中的亮点与不足,希望能与更多企业共勉。除了产品自身的优势,产品的卖点也需要企业在扩大自己的市场时不断宣传。” 相似文献
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《中外食品工业信息》2012,(9):45-45
关键字:多口味 无沉淀 莲藕的深加工,一般多是藕粉或者成菜等,如今开发藕汁.可谓是创新发展,而生产藕汁的厚福牌企业莲藕汁是以新鲜莲藕为原料,经过现代科学技术加工而成的新型果蔬饮料,藕香浓郁,甘甜爽口。 相似文献