GA_3对巨峰、玫瑰香葡萄无核效应及其成因的探讨

通过对GA_3在巨峰、玫瑰香葡萄不同时期、不同浓度及去雄、授粉等8个处理的试验认为,GA_3诱导巨峰和玫瑰香无核的主要原因存在较大差异。巨峰花前25mg·kg~(-1)处理导致胚不能正常受精而形成无籽果实;玫瑰香花后GA_3处理可能使受精胚退化而无籽。关于GA_3促进葡萄早熟的效应,本文认为,是通过无核的间接作用,核的存在是抑制成熟的关键。     

Plant constitutents involved in coating practices among traditional African potters

A phytochemical survey of several plant species used in sub-Saharan Africa for the treatment of pottery, as well as some coating experiments carried out with purified extracts ofBridelia ferruginea stem bark, indicated that procyanidin fractions play a predominant role in the coating properties of the plant extracts. The analysis by high performance gel permeation chromatography of organic compounds isolated from the vessel walls suggested that products deriving from pyrolysis of procyanidins are detectable both in contemporary and older pottery, and their analysis could be useful for archaeological purposes.     

ICP原子发射光谱法测定葡萄叶中的8种元素含量

用电感耦合等离子体（ICP）原子发射光谱法直接测定美国黑提葡萄的正常叶和枯叶中Cu、Mg、Zn、Mn、Cd、Ni、Al、Fe八种元素的含量,结果表明,此方法简便、可靠,具有良好的精密度和准确性。     

地膜覆盖对鲜食葡萄果实及新梢生长发育的影响

选用紫色、白色、蓝色薄膜及蓝色厚膜4种地膜对两葡萄品种里扎马特、凯然诺尔进行覆盖栽培。试验结果表明：覆膜与不覆膜（对照）相比,葡萄覆膜栽培后可提高供试品种座果率50%以上,并可增加供试品种新梢生长量30%;里扎马特品种果粒重可增大40%以上、凯然诺尔品种果粒平均重略有减小;与对照相比,两品种果实中可溶性固形物含量有所下降。经方差分析,处理之间无明显差异。从果实生长发育和新梢生长发育状况来看,以蓝色薄膜的覆盖综合效果为最佳。     

葡萄籽蛋白提取工艺研究

采用碱溶酸沉法对葡萄籽蛋白提取工艺进行了研究.结果表明：葡萄籽粉碎粒度为40目,以pH值为9的碱液,按m（料）∶V（液）=1∶10,在50℃条件下搅拌浸提45min时,蛋白质的提取最经济.     

脱脂葡萄籽中原花青素提取工艺研究

采用溶剂回流提取方法,以脱脂葡萄籽为原料,以原花青素提取率为考察指标,研究了提取溶剂种类、溶剂浓度、提取温度、料液比、提取时间、提取次数等因素对葡萄籽中原花青素提取效果的影响;通过正交试验设计,确定脱籽葡萄籽中原花青素的最佳提取工艺条件为:提取溶剂70%乙醇,提取温度50℃,料液比1∶7,提取时间50 m in,提取3次;在此优化条件下脱脂葡萄籽中原花青素的平均提取率为5.00%。     

昌黎县酿酒葡萄产业化存在问题与对策研究

通过对昌黎县酿酒葡萄产业化现状及存在问题的分析 ,认为葡萄产业化可持续发展的关键是 :提高葡萄和葡萄酒的质量 ;建立利益分配机制和开拓市场 ,并对此提出了一些具体措施。     

Wine aroma

Conclusions The progress made in the analysis of volatile wine constituents has led to a better understanding of the complexity of wine aroma.Now many factors influencing wine aroma are not only characterized by their sensory impact, but also by chemical data which in many cases allow a more differentiated approach. By correlating sensory and analytical data headway has been made, especially in the field of wine off-odors. Successful analytical cultivar differentiation based on wine volatiles indicates the importance and possibilities of wine aroma for quality control.     

高端食用油品牌发展战略探析

以B-WELL葡萄籽油为例,通过分析中国食用油市场的品牌状况,指出高端食用油只有在品牌定位、品牌目标市场定位、品牌推广渠道定位等方面实施品牌发展战略,才能抢占高端食用油市场发展先机。     

DSPE-GC/MS快速检测葡萄酒中52种农药残留

利用分散固相萃取GC-MS分析,建立了葡萄酒中52种不同极性农药残留的快速检测方法.葡萄酒样品用酸化乙腈经振荡提取和超声辅助提取后,上清液用混合吸附填料进行分散固相萃取净化,高速离心后,再通过氮吹方式浓缩,复溶,过滤膜,用GC/MS检测.与传统前处理方法相比,分散固相萃取技术在检测成本和处理速度上有很大优势.52种农药在3个浓度添加水平上的加标回收率范围是60%~110%,RSD15%(n=5),定量限是0.000 7~0.032 3 mg/kg.