共查询到16条相似文献，搜索用时 140 毫秒
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切分胡萝卜生理变化的研究 总被引：2，自引：0，他引：2
研究了胡萝卜切分后的生理变化规律。结果表明,鲜切胡萝卜的呼吸强度、白度值升高,pH值、总胡萝卜素含量下降。切分胡萝卜的硬度、渗出物含量以及颜色的变化与其切分表面的水分损失有着密切的关系,另外机械损伤也是造成鲜切胡萝卜脱色的直接因素。 相似文献
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不同光照条件对几种类型蔬菜呼吸强度变化的影响 总被引：1，自引：0，他引：1
为探明光照条件对番茄、西兰花、花椰菜和芦笋4种类型蔬菜呼吸代谢的影响,采用近室温（15℃）、亚低温（8℃）和适宜贮温（0～2℃）3种温度,分别对该4种蔬菜在黑暗和光照条件下的呼吸强度进行了对比研究。结果表明,光照对采后离体蔬菜的呼吸代谢作用有较大影响。在同一贮藏温度下,番茄、西兰花和芦笋置于光照条件下比黑暗条件下的呼吸强度低,光照降低呼吸代谢的效果明显;而花椰菜则受光照的影响较小,光照抑制呼吸强度的效果不显著;同时,光照对呼吸代谢的影响还与温度有关,一般情况下,贮藏温度越低,光照对呼吸强度的影响越小。 相似文献
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以太谷壶瓶枣为试验材料,将其切分为半果、1/4果进行热风干燥,并与未切分的全果作对比,通过测定含水量、VC含量、复水比,结合感官评价,研究不同切分处理对红枣干燥品质的影响。结果表明,果形越小,干燥速率越快,但对VC含量损失较大;果实比表面积越大,复水比越高;干燥温度越低,产品品质越好。综合考虑,半果是60℃或65℃下热风干燥的最佳果形。 相似文献
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水分和温度对稻米呼吸强度的影响 总被引：1，自引：0，他引：1
稻米在高水分或高温下储藏加强了稻米的呼吸强度 ,这可能是导致稻米黄变或发烧的一个原因。对 1 998年秋收获的两个不同稻米品种进行了水分和温度对稻米呼吸强度影响的研究。测定不同温度下糙米的呼吸强度 :将高、中和低水分稻米样品分别密闭在罐内 ,温度平衡到 2 0～ 80℃。通过测定罐内空间的ＣＯ2 浓度对呼吸率进行定量测定。测定水分对呼吸强度的影响 :对水分 1 0 %～ 2 5 %的糙米分别进行试验。试验表明水分和温度明显影响稻米的呼吸强度。呼吸对温度的反应取决于水分和稻米的品种。当水分增加 1 5 %～ 2 0 % ,呼吸强度随之增加 ,在 5 … 相似文献
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WANG Jin ping 《保鲜与加工》2008,8(4):23-26
通过对鲜切甘蓝的切分、前处理、蒸烫、添加剂溶液浸泡、离心脱水、包装、贮藏等工艺点的调控,研究其对鲜切甘蓝品质的影响,并通过测定呼吸强度、多酚氧化酶（ppo）活力、褐变度等指标观察鲜切甘蓝质量变化,以确定最佳保鲜工艺条件。试验结果表明,经优化工艺处理的鲜切甘蓝保鲜期可达到10天以上。 相似文献
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介绍了鲜切叶菜外观品质及营养成分下降的原因,并对其生理生化反应机理,包括伤乙烯的生成、呼吸作用增强、酶及微生物的变化原因进行了深入地分析。综述了目前国内外鲜切叶菜低温贮藏、化学保鲜、气调包装以及涂膜等保鲜技术的研究进展与存在的问题,对生物保鲜、减压贮藏等新型保鲜技术在鲜切叶菜上的应用进行了探讨,并展望了鲜切叶菜保鲜技术未来的发展方向。 相似文献
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Maria Vargas Amparo Chiralt Ana Albors Chelo González-Martínez 《Postharvest Biology and Technology》2009,51(2):263-271
Edible coatings based on high molecular weight chitosan, pure or combined with methylcellulose or oleic acid, were applied to fresh-cut carrots cv. Nantesa by simple immersion and by applying a vacuum pulse (5 kPa for 4 min). Water vapour resistance, colour, mechanical properties and respiration rates of non-coated and coated samples were determined. Coatings improved sample appearance, since they diminished the occurrence of the white blush during storage. When applied by simple immersion, they neither conferred significant barrier properties nor the preservation of the mechanical properties of fresh-cut carrot samples. In contrast, coating application with a vacuum pulse enhanced all the positive effects, since the resistance of water vapour transmission of the samples was significantly improved, and better preservation of the sample colour and mechanical response during cold storage was obtained. Differences in film composition did not significantly affect the coating behaviour, probably due to the variability induced by different factors when coatings were applied to the carrot surface. 相似文献
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研究了3种不同的包装对鲜切青椒贮藏过程中感官指标、质量损失率、呼吸强度、相对电导率、可溶性固形物含量、叶绿素含量和菌落总数的影响。结果表明,厚0.02 mm的塑料薄膜袋是3种包装方式中保鲜效果较为突出的,能有效降低鲜切青椒的质量损失率,抑制呼吸作用,减缓青椒内可溶性固形物和叶绿素含量的下降,延缓相对电导率的下降,并且在第12天开始出现腐烂现象,与贮藏效果较差的塑料包装盒相比较,能有效延长贮藏时间3 d。 相似文献
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For consumers, fresh-cut fruits and vegetables are a convenient product and a healthy source of fresh food that has nutritional and sensory characteristics similar to those of intact products. In this paper, a non-destructive method for analyzing fresh-cut fruit and vegetables is described. The biospeckle laser technique is based on the optical phenomenon of interference generated by a coherent light interacting with biological materials or dynamical systems. Although many publications on this technique's biological applications have reported that biospeckle activity corresponds to the activity of biological samples, there is some difficulty in determining the correlation between a particular phenomenon and the activity observed. In this study, we evaluated the use of biospeckle data for measuring the physiological properties of fresh-cut carrots stored at two temperatures (0 and 10 °C). In conjunction with the biospeckle activity, the moisture content, respiration rate, water activity, and mass loss changes were monitored using traditional analytical methods to evaluate the possible correlation of the biospeckle data with any of these phenomena with or without the use of frequency signatures. The results showed that the manifestation of water in the monitored activity was isolated only by removing these high frequencies, thus allowing the activity manifested in the material to be linked to a specific phenomenon, such as respiration. Therefore, we were able to monitor the respiration process in fresh-cut carrots and assign a spectral signature to their water content and respiration. 相似文献