石榴皮栲胶在皮革鞣制中的应用

对石榴皮栲胶(GE)性能指标进行了分析检测,并将其应用于绵羊服装革主鞣和复鞣中,通过单因素实验法优化了其应用工艺,结果表明:石榴皮栲胶用于绵羊皮服装革主鞣和复鞣时的最佳用量分别为20%和7%,主鞣服装革的收缩温度(Ts)为68.8～75.2℃,复鞣服装革的Ts则高达112.9～125.3℃,并且革身柔软、丰满、具有发泡感,有较大的延伸性,回弹性好.     

石榴染料的提取及用于真丝织物染色的研究进展

归纳了石榴染料的提取方法和提取工艺,总结了石榴染料用于真丝绸织物染色的研究成果,并指出了石榴染料染色的发展方向.     

石榴叶酚酸测定及提取工艺研究

以石榴叶为原料,采用Folin-Ciocalteu 法定量测定石榴叶提取液中总酚含量,通过单因素试验和正交试验对石榴叶总酚的提取工艺进行探讨。确定其最佳提取条件为：料液比1:25(g/ml),温度70℃,提取溶剂为75% 乙醇,提取时间1.5h。综合考虑成本因素,原料过1mm 筛较为适宜,按照该工艺提取石榴叶总酚的得率为16.63%。     

响应面优化超声-微波协同提取石榴叶中总黄酮工艺的研究

为确定石榴叶中总黄酮提取的最佳工艺,在单因素试验的基础上,应用响应面法优化石榴叶中总黄酮的提取条件。结果表明:微波功率、提取时间和料液比对黄酮提取率影响极显著;最佳工艺为:乙醇体积分数71.5%(v/v),微波功率662 W,提取时间262 s,液料质量体积比33.5g/m L,在此条件下提取1次,石榴叶中总黄酮的提取率为89.21%。     

石榴皮总黄酮的提取工艺及抑制亚硝化反应

目的:研究石榴皮总黄酮的提取工艺及黄酮类物质对亚硝化反应的抑制能力。方法:通过正交试验,探讨影响总黄酮提取率的因素范围和最佳组合,并采用分光光度法测定总黄酮提取液对亚硝酸盐清除能力和亚硝胺抑制能力。结果:石榴皮总黄酮的最佳提取工艺条件为乙醇体积分数60%、料液比1:60(g/mL)、提取时间40min、超声电流强度150mA。在最佳提取工艺条件下,石榴皮总黄酮的平均提取率为84.8mg/g,石榴皮总黄酮提取液对亚硝酸钠的最大清除率为81.2%,对亚硝胺合成的最大阻断率为67.0%。结论:石榴皮总黄酮提取液对亚硝化反应的抑制能力较强。     

Hot water,UV‐C and superatmospheric oxygen packaging as hurdle techniques for maintaining overall quality of fresh‐cut pomegranate arils

BACKGROUND: In recent years there has been increasing consumer pressure to avoid the use of agrochemicals such as chlorine on fresh plant products for extending their shelf life. The combined use of eco‐sustainable techniques may be an alternative. The effect of hot water (HW), ultraviolet‐C (UV‐C) light and high oxygen packaging (HO) on the overall quality of fresh‐cut pomegranate arils stored under modified atmosphere packaging (MAP) for up to 14 days at 5 °C was studied. RESULTS: Arils extracted manually, washed with chlorine (100 µL L^?1 NaClO, pH 6.5, 5 °C water), rinsed and drained were exposed to single or combined (double and triple) hurdle techniques. The HW treatment consisted of a 30 s immersion in water at 55 °C followed by air surface drying. A 4.54 kJ m^?2 dose was used for the UV‐C treatment before packaging. Active MAP with initial 90 kPa O₂ was used in the HO treatment. The respiration rate remained relatively constant throughout shelf life, with no differences among treatments. CO₂ accumulation was higher within HO packages. HW induced a slight reduction in total soluble solids, while no changes in titratable acidity were found. HO‐treated arils had the highest phenolic content, while the lowest was found in HW‐treated arils. The lowest antioxidant activity was found in HW + UV‐C + HO and the highest in UV‐C + HO and HO treatments. HW alone or in combination with UV‐C and HO inhibited mesophile, mould and yeast growth, while UV‐C + HO was most effective for controlling yeast and mould growth. CONCLUSION: UV‐C and HO either alone or in combination are promising techniques to preserve the quality of pomegranate arils for up to 14 days at 5 °C. © 2012 Society of Chemical Industry