研究了热处理法钝化苔干多酚氧化酶（PPO）活性，从而控制酶促褐变的工艺条件及效果。
The activity of polyphenol oxidase (PPO) inlactuca sativa var. angustata was analyzed using heat treatment method to control its enzymatic browning.
多酚氧化酶（PPO）和过氧化物酶（POD）是影响龙眼果实采后果皮褐变的关键酶。
Peroxidase (POD) and polyphenol oxidase (PPO) play the important roles of longan browning in period of postharvest storage.
多酚氧化酶是一类普遍存在于植物、真菌、昆虫的质体中，由核基因编码能与铜相结合的金属蛋白酶。
Polyphenol oxidase (PPO) is a ubiquitous copper metalloprotein in the plastids of many plant species, fungi and insects.
草菇在贮藏过程中表现出多酚氧化酶(ppo)活性与褐变程度不一致的现象，这主要是由于PPO与底物区域化分布的结果。
The results also showed that the PPO activity of the straw mushroom failed to correspond with the Browning as a result of compartmentation of polyphenol oxidase and its substrates.
以峨眉拟单性木兰嫩枝茎段为测试材料，研究多酚氧化酶（PPO）活性和总酚含量及其季节变化规律。
Taking burgeon and stem of Parakmeria omeiensis Cheng as test materials, polyphenol oxidase(PPO), total phenol content, and seasonal change law were studied.
随着保压时间的延长和温度的升高，桃汁中多酚氧化酶相对活性逐渐降低。
The activity of PPO in the juice decreased gradually with the rise of heating temperature and the extension of pressure holding time.
纯化后的酶液经聚丙烯酰胺凝胶电泳，分别采用银染色和多酚氧化酶活性染色均显示一条电泳带。
The result from polyacrylamide gel electrophoresis of purified enzyme indicated that only one band was found using silver stain and PPO activity stain, respectively.
本研究测定了199个小麦品种全麦粉的小麦多酚氧化酶(ppo)活性及全麦粉中的多酚含量，进一步探讨了PPO活性测定方法。
In this study, 199 wheat varieties were measured to determine their variation in PPO activity and the polyphenol content. The method of polyphenol activity was also discussed.
使用超高压技术单独或协同热对鲜榨苹果汁进行处理，研究对其中多酚氧化酶（PPO）的影响。
The ultrahigh pressure technology alone or combined with heating was used in processing fresh apple juice and the its effect on PPO activity in juice was studied.
甘薯破碎后经多酚氧化酶（ PPO）的作用，严重影响淀粉的白度。
Melanins are produced by polyphenol oxidase (PPO) during sweet potato processing, which can affect the whiteness of sweet potato starch.
本文对荔枝壳中多酚氧化酶(PPO)的活性及不同抑制剂的抑制效果进行研究。
The activity of PPO of lichi hull and the control effect for different inhibitor were studied in this paper.
探讨了抗坏血酸在不同温度、品种、浓度、真空度条件下对苹果多酚氧化酶的抑制效果。
This paper discussed the effects that Vc did preventive to apple's PPO in different temperature, varieties, concentrations and vacumm.
盾叶薯蓣细胞与内生真菌re0105共培养第二代的性状与POD、PPO和PAL活性和过氧化物酶、多酚氧化酶、酯酶同工酶谱带与第一代相比比较稳定。
The second generation callus of co-culture of cell and RE0105 was stable in culture character, POD, PPO and PAL activities and isoenzyme bands of POD, PPO, EST.
应用分光光度法，研究了甘薯中多酚氧化酶(PPO)的特性及褐变的控制方法。
In this paper, the characteristics of Polyphenol Oxidase (PPO) from sweet potato and its control methods were studied by spectrophotometry.
与抗病性相关酶类的活性，如苯丙氨酸解氨酶（PAL）、多酚氧化酶（PPO）活性均高于对照。
The activity of resistance-related enzymes, such as phenylalanine ammonia-lyase (PAL), polyphenol oxidase (PPO) and peroxidase (POD) were higher than that of control.
目的研究鲜榨梨汁中多酚氧化酶的活性受高压和热协同处理的影响。
Objective To study the effect of high pressure alone or combined with heating treatment of fresh pear juice on PPO activity in it.
采用硫酸铵沉淀法得到平菇多酚氧化酶粗提液。
The rough extract of Pinggu mushroom PPO was obtained by ammonium sulfate precipitation method.
例如苯丙氨酸解氨酶（PAL）、过氧化物酶（POD）、多酚氧化酶（PPO），这些酶和植物的抗病性是密切相关的。
Such as PAL, POD , SOD and PPO , which are strongly associated with the plant disease resistance.
甘蔗在贮藏过程中蔗糖转化酶和多酚氧化酶活性不断提高，滴定酸、酒精和还原糖含量逐渐增加，而蔗糖和可溶性总糖含量逐渐减少。
During storage, activities of sucrose invertases and PPO increased gradually, titratable acid, alcohol and reducing sugar contents increased, while sucrose and soluble sugar contents decreased.
主要研究结果如下：（1）采用丙酮粉沉淀抽滤法从澳洲青苹中提取多酚氧化酶。
The study shows that blocking oxygen is the effective method to control enzymatic browning. The results are summarized as follows:(1) PPO was extracted from Granny Smith with acetone.
本文研究了峨眉拟单性木兰的群落特征、组培技术、嫁接技术、多酚氧化酶（PPO）活性和总酚含量。
This article studied the community characteristics, tissue culture, grafting, PPO activity and total phenols content.
同时研究了不同抑制剂对南果梨多酚氧化酶的抑制效果。
The inhibition effect from different inhibitors on the inhibition of PPO was also studied.
结果表明，所选用的各种化学抑制剂均具有一定的抑制苦杏仁多酚氧化酶活性的效果，在试验范围内呈量效关系；
The results show that all the inhibitors chosen had good inhibitions on the PPO activity within the conditions tested, and there was a good relationship between the dose and its effect.
结果表明，喷施水杨酸抑制了过氧化物酶（POD）、多酚氧化酶（PPO）、苯丙氨酸解氨酶（PAL）活性，降低了石细胞的大小、密度和含量。
The results showed that POD, PPO and PAL activities were inhibited and the stone cell density , diameter and contents were decreased in the treatment of SA spraying;
通过不同浓度和不同诱导时间两种处理方式，测定了壳低聚糖和L - C对黄瓜叶片中过氧化物酶、多酚氧化酶和苯丙氨酸解氨酶等防御酶的诱导效果。
Activities of the defense enzymes involved in POD, PPO and PAL induced by COS and L-C were measured by two different treatments of different concentrations and different induced time.
此外，本文还对多酚氧化酶的应用进行简单的论述。
In addition, the application of PPO is briefly discussed in this paper as well.
不同时期叶面喷施硼酸降低了梨果石细胞含量，果实过氧化物酶、多酚氧化酶和苯丙氨酸解氨酶活性也低于对照，且幼果期处理效果最佳。
The contents of sclereid and activities of some enzymes, such as POD, PPO and PAL are decreased under the applications of H3BO3, and the effect of the application at young fruit stage is the best.
不同时期叶面喷施硼酸降低了梨果石细胞含量，果实过氧化物酶、多酚氧化酶和苯丙氨酸解氨酶活性也低于对照，且幼果期处理效果最佳。
The contents of sclereid and activities of some enzymes, such as POD, PPO and PAL are decreased under the applications of H3BO3, and the effect of the application at young fruit stage is the best.
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