不同锌处理对麦芽富锌的影响

研究了不同浓度的ZnSO4以及一定浓度的ZnSO4配合不同浓度的赤霉素GA3对麦芽富锌量的影响。结果表明,在浸麦度达到4 1 8%时用15 0mg/L的ZnSO4处理效果最好,麦芽有机锌含量是对照的2 0 3倍;当ZnSO4浓度为10 0mg/L ,赤霉素浓度为0 10mg/L时,对富锌作用促进最大,是对照的2 35倍。文中还对麦芽的富锌速度和有机锌在麦芽中的分布进行了研究。结果表明,发芽36h麦芽转化的有机锌量最多,达到36 0 0μg/ (g·d) ;蛋白质和多糖中有机锌的比例分别占总锌的6 6 %和2 3%。实验为富锌麦芽的生产提供了一定的理论基础     

玉米萌发植酸酶酶学特性的初步研究

研究了在玉米发芽过程中改变发芽温度、环境pH值、添加赤霉素和金属离子等培养条件对植酸酶活力的影响,确定了玉米发芽工艺条件:浸泡方式添加金属Ca2+离子,溶液pH4.0,发芽温度30℃,发芽48h.在此最佳条件下,植酸酶活力达到最大值为5.857U/g(绝干).     

不同浓度赤霉素处理对油桃保鲜效果的影响

以油桃为试材,用浓度为150mg／kg、200rag／kg、250mg／kg的赤霉素溶液涂膜处理30min,定期测定油桃果实的各项指标,研究赤霉素对油桃保鲜效果的影响。结果表明,经过赤霉素溶液涂膜处理,有效地减轻了油桃果实的失重现象、推迟了呼吸跃变出现时间、延缓了糖分和VC损失,有防止腐烂、保持硬度作用;对含酸量影响不大,其中浓度为200mg／kg的赤霉素溶液对油桃果实进行涂膜处理保鲜效果最好,能够较长时间的保持油桃果实的贮藏品质。     

高效液相色谱测定啤酒和麦芽中的赤霉素

利用高效液相色谱测定啤酒和麦芽中的赤霉素。结果表明,该方法的相对标准偏差4.68%,线性系数R2=0.9977,方法定量检出限0.15 mg/L,回收率在93.60%～115.22%,该方法能满足测定啤酒和麦芽中赤霉素的要求。     

葡萄果实膨大剂残留物分析方法研究

对果实的膨大作用最为明显的是氯吡尿等植物调节剂,随着人们对于食品安全的不断关注,人们开始将目光投射在药剂的使用是否对人类的身体产生危害上,在当今的时代背景下,对于葡萄果实膨大剂的残留进行分析,对于提高食品的安全性有着重要的意义。本文选取了氯吡脲和赤霉素两种典型的膨大剂作为研究对象,利用高效液相色谱分析法分析了葡萄的膨大剂残留情况,对于指导膨大剂的使用、促进食品安全有一定的指导作用。     

虎尾兰吸收甲醛能力的试验研究

采用乙酰丙酮荧光光度法研究虎尾兰吸收甲醛的工艺,研究表明虎尾兰吸收甲醛的最佳条件为赤霉素浓度13.0μg/mL、pH=6.5、处理时间240min。     

Postharvest Gibberellin and Heat Treatment Effects on Polyamines, Abscisic Acid and Firmness in Lemons

Lemons at two ripening stages were vacuum-infiltrated with 100 ppm of gibberellin A₃ (GA₃) or heat-treated at 45°C, and then stored at 15°C for 3 wk. Both treatments increased fruit firmness either in stage 1 or in stage 2. Also, the levels of free putrescine and spermidine in the skin were higher in treated lemons than in controls but spermine concentration did not show significant differences, in fruits of either stage. GA₃ treatment was the most effective in retarding the color change during storage, especially in stage 1 fruits, which was related to the lowest levels of abscisic acid found.     

高效液相色谱串联四极杆质谱法同时测定豆芽中7 种药物残留

为加强对豆芽类产品的监管,研究豆芽中7 种药物（6-苄基腺嘌呤、4-氯苯氧乙酸、2,4-D、赤霉素、多菌灵、腐霉利和恩诺沙星）同时检测的方法。该方法使用乙腈对豆芽中7 种药物进行同时提取,使用高效液相串联四极杆质谱仪对上述7 种药物进行检测。7 种药物在0.01～10 μg/mL（多菌灵和恩诺沙星在0.01～1 μg/mL）内线性良好（R2≥0.987）。两种豆芽中7 种药物的3 个添加量（分别为0.002、0.2、0.5 mg/kg）回收实验结果表明：7 种药物的回收率为60.31%～108.51%,相对标准偏差为1.03%～13.10%,方法检出限为0.010 5～0.125 μg/kg。     

Light Quality and Intensity Modulate Cold Acclimation in Arabidopsis

Plant survival in temperate zones requires efficient cold acclimation, which is strongly affected by light and temperature signal crosstalk, which converge in modulation of hormonal responses. Cold under low light conditions affected Arabidopsis responses predominantly in apices, possibly because energy supplies were too limited for requirements of these meristematic tissues, despite a relatively high steady-state quantum yield. Comparing cold responses at optimal light intensity and low light, we found activation of similar defence mechanisms—apart from CBF1–3 and CRF3–4 pathways, also transient stimulation of cytokinin type-A response regulators, accompanied by fast transient increase of trans-zeatin in roots. Upregulated expression of components of strigolactone (and karrikin) signalling pathway indicated involvement of these phytohormones in cold responses. Impaired response of phyA, phyB, cry1 and cry2 mutants reflected participation of these photoreceptors in acquiring freezing tolerance (especially cryptochrome CRY1 at optimal light intensity and phytochrome PHYA at low light). Efficient cold acclimation at optimal light was associated with upregulation of trans-zeatin in leaves and roots, while at low light, cytokinin (except cis-zeatin) content remained diminished. Cold stresses induced elevation of jasmonic acid and salicylic acid (in roots). Low light at optimal conditions resulted in strong suppression of cytokinins, jasmonic and salicylic acid.     

小麦幼苗中内源激素(GA_3,IAA)的高效液相色谱测定

本文介绍了高效液相色谱测定麦苗中内源激素(赤霉素3—吲哚乙酸)的方法。测定前用国产预处理小柱处理样品,简化了样品纯化过程,提高了样品峰的分辨率和测定精度。