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Development of a 1-methylcyclopropene package delivery system to control tomato ripening.

机译:开发1-甲基环丙烯包装递送系统以控制番茄成熟。

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摘要

1-methylcyclodextrin (1-MCP) was used to prolong the freshness of tomatoes during postharvest storage. The effect of storage temperature and 1-MCP treatment conditions on the ripening process of tomatoes was evaluated. Change in two major tomato pigment (chlorophyll and lycopene) contents in tomatoes was also investigated. Sorption behavior for the 1-MCP/adsorbing agents was studied using inverse gas chromatography. The specific retention volume and various thermodynamic parameters relating to adsorption of 1-MCP on the adsorbing agents were calculated. Adsorption and 1-MCP release studies from the adsorbing agents in the sachet system were conducted to evaluate delivery of the 1-MCP gas to the tomatoes under the environmental conditions within the package.; Skin color, firmness, fruit weight, and ethylene production were used as quality indicators for the stored tomatoes. Total chlorophyll and lycopene contents in tomatoes were quantified using a specific extinction coefficient method. Sorption isotherms of 1-methylcyclopropene (1-MCP) on silica gel, Tenax-TA, and activated clay were determined at low sorbate concentration. Sachets made from Tyvek®, paper, LDPE, and PVA materials were fabricated to contain silica gel and activated carbon. The 1-MCP release study was performed using a closed system under two different environmental conditions, dry air (0%RH) and 90%RH. The partitioning of 1-MCP between the gas/polymer matrix was determined for several adsorbing agents, and in sachet materials to estimate the adsorb ability of 1-MCP in dry air at 23°C. The water and 1-MCP permeability of the sachet pouch film were measured.; Once-a-day 1-MCP treatment at 10°C was very effective in retarding changes in the skin color of the tomatoes. Exposure of tomatoes to 1-MCP gas at 10°C, using a once-a-day method was the most effective in delaying chlorophyll degradation and lycopene synthesis. The sorption isotherms followed Henry's law, and behaved according to the binding site theory. Silica gel had a much higher number of binding sites for 1-MCP, compared to Tenax-TA and activated clay agents. PVA sachets containing silica gel indicated slow release of 1-MCP. The amount of 1-MCP released from the PVA sachet containing silica gel at 90%RH was larger than the amount of 1-MCP released at dry air condition.; The results showed that combination of 1-MCP treatment with low storage temperature was very effective in delaying color change in tomatoes. PVA sachets containing silica gel have potential use for slow release of 1-MCP from the experimental results in a closed system. Delivering the 1-MCP gas to the tomatoes, from the sachet containing an adsorbing agent may help maintain the freshness of tomatoes during postharvest storage.
机译:1-甲基环糊精(1-MCP)用于延长番茄收获后的新鲜度。评估了贮藏温度和1-MCP处理条件对番茄成熟过程的影响。还研究了番茄中两种主要番茄色素(叶绿素和番茄红素)含量的变化。使用反相气相色谱法研究了1-MCP /吸附剂的吸附行为。计算了与1-MCP在吸附剂上的吸附有关的比保留体积和各种热力学参数。进行了囊袋系统中吸附剂的吸附和1-MCP释放研究,以评估在包装内的环境条件下1-MCP气体向西红柿的输送。皮肤的颜色,紧实度,水果重量和乙烯产量被用作储存番茄的质量指标。使用特定的消光系数方法对番茄中的总叶绿素和番茄红素含量进行定量。在低的山梨酸酯浓度下测定了1-甲基环丙烯(1-MCP)在硅胶,Tenax-TA和活性粘土上的吸附等温线。由特卫强®,纸,LDPE和PVA材料制成的香囊被制成含有硅胶和活性炭的材料。 1-MCP释放研究是在两个不同的环境条件(干燥空气(0%RH)和90%RH)下使用封闭系统进行的。确定了几种吸附剂在气/聚合物基体中1-MCP的分配,并在香囊材料中估算了1-MCP在23°C的干燥空气中的吸附能力。测量小袋膜的水和1-MCP渗透性。每天一次在10°C下进行1-MCP处理在抑制番茄皮肤颜色变化方面非常有效。每天使用一次方法将西红柿在10°C下暴露于1-MCP气体中对延迟叶绿素降解和番茄红素的合成最为有效。吸附等温线遵循亨利定律,并根据结合位点理论进行反应。与Tenax-TA和活化粘土剂相比,硅胶具有更高的1-MCP结合位点数量。含有硅胶的PVA香囊表明1-MCP释放缓慢。从含PVA的硅胶袋中以90%RH释放的1-MCP的量大于在干燥空气条件下释放的1-MCP的量。结果表明,1-MCP处理与低储存温度的组合对延迟番茄的颜色变化非常有效。在封闭系统中,含有硅胶的PVA香囊可用于从实验结果中缓慢释放1-MCP。从包含吸附剂的小袋中将1-MCP气体输送至西红柿,可有助于在收获后的存储过程中保持西红柿的新鲜度。

著录项

  • 作者

    Lee, Youn Suk.;

  • 作者单位

    Michigan State University.;

  • 授予单位 Michigan State University.;
  • 学科 Engineering Packaging.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 199 p.
  • 总页数 199
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 包装工程;
  • 关键词

  • 入库时间 2022-08-17 11:44:40

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