Theoretical and experimental studies on low-temperature adsorption drying of fresh ginger

The working principle of low-temperature adsorption drying and the advantages of its application for biological materials drying were introduced in this paper. By using fresh ginger as the drying material, the effects of temperature and relative humidity on its drying characteristics were examined. The results show that the drying rate increases with the temperature increasing or the humidity decreasing. The drying time to the equilibrium is almost the same under different humidity conditions, but low equilibrium moisture content can be acquired under low humidity. The shrinkage characteristics of fresh ginger were also studied. The change of its surface appearance during the drying process was characterized by the new Charged Coupled Device (CCD) and the Environmental Scanning Electron Microscopy (ESEM) technique. A mathematical model of drying dynamics was set up according to the experiments.     

Effect of microwave‐assisted extraction on the release of polyphenols from ginger (Zingiber officinale)

The significance of different variables viz. temperature, time and solvent at constant power in microwave‐assisted extraction (MAE) process of ginger was studied and compared with conventional method. Aqueous ethanol (50%) provided higher yields of extract as well as the highest release of total polyphenols (TPP) than alcoholic solvents. The reason could be the high dielectric constant of aqueous ethanol as compared to alcohols. Microwave heating being a volumetric process, an exposure time of 1 min was found to be sufficient. The better penetration of microwaves and greater solubility at higher temperature resulted in higher yield of TPP and [6]‐gingerol. The resultant extract showed higher radical scavenging activity (RSA) values. Thus, MAE allowed higher recoveries compared to conventional extraction process, with improvement in the quantity and quality of extract in very short period of time.     

姜与人体营养健康

对姜的营养、保健功能及其在日常生活中的应用进行了介绍，更利于推动我国调味品业的进一步研究与开发。     

铜陵白姜精油分析研究

利用水蒸气蒸馏法和同时蒸馏-萃取法(SDE)萃取铜陵白姜姜精油,并通过GC/MS方法进行定性、定量分析。结果显示,SDE法能够有效地提取到姜精油,经GC/MS分析鉴定出87种组分。以色谱峰面积归一化法测定各成分的相对百分含量,含量最高的是姜烯(21.91%),其次是乙酸香叶酯(12.45%)、β-倍半水芹烯(11.76%)、金合欢烯(11.73%)。乙酸香叶酯在铜陵白姜中含量较高。     

姜油树脂各部位体外抗氧化活性的比较

为了比较姜油树脂及其大孔树脂分离纯化的各部位体外抗氧化作用,利用70%乙醇溶液浸提生姜得到姜油树脂,再用AB-8大孔树脂对其分离纯化并用香草醛作为标准品测定各部位姜辣素含量,利用Fe2+-H2O2诱导小鼠肝匀浆生成MDA,测定样品对MDA的抑制率,并与VitE进行比较,模拟机体黄嘌呤-黄嘌呤氧化酶反应系统测定样品类SOD活性。结果显示:50%乙醇相姜辣素含量最高,为34.7%;姜油树脂和50%相、75%相、95%相对MDA均有不同程度的抑制,50%相和75%相效果优于VitE,水相和25%相在实验浓度范围内达不到半数抑制浓度;在类SOD测定中,50%相和75%相类SOD活性最强,二者无显著差异,其它各部位类SOD活性偏低。因此,姜油树脂和各部位体外有一定的抗氧化活性,尤以50%相和75%相最为明显,且存在剂量效应关系。     

生姜抽提液处理技术及其在可乐饮料中的应用

生姜抽提物在饮料中应用时往往会引起饮料的沉淀，影响含姜汁饮料的价值。探讨了利用复合蛋白酶对生姜抽提液进行处理的技术。所制得的姜汁抽提液澄清、无沉淀，可以任何比例与可乐糖浆混合制成姜汁可乐饮料。经贮存试验，姜汁可乐无沉淀。这一处理技术已应用于工业化生产。     

姜汁啤酒的研制

针对冬季啤酒市场,开发姜汁保健啤酒。采用生姜渣汁分离,再对姜汁进行处理,姜渣在糖化工段加入,姜汁在发酵工段加入,酿制出的产品质量好,口味独特,适应冬季饮用,具有防病健身,理气健胃的保健作用。     

姜汁凝固型牛奶配方与工艺优化研究

以牛奶和生姜为主要原料,通过单因素及正交实验确定了姜汁凝固型牛奶配方与优化加工工艺。结果表明:姜汁凝固型牛奶的优化配方和工艺为奶粉用量18.5%,姜汁用量4.0%,蔗糖用量8%,pH 6.5,凝乳温度60℃。制得的产品凝乳完全,表面光滑,无乳清析出,具有姜汁凝固型牛奶固有的姜汁和牛奶的香味,口感滑嫩细腻。     

微波辅助萃取法从生姜中提取姜辣素的工艺

以生姜为原料,以无水乙醇为溶剂,利用微波辅助萃取从生姜中提取姜辣素,考察不同因素对姜辣素提取率的影响,再通过正交试验优化提取工艺,得到优化工艺条件。试验结果表明,姜粉目数为80目,微波提取时间为100 s,提取功率为220 W,液料比为90∶1(mL/g)时,生姜中姜辣素的提取率可达到1.989%。     

生姜速冻前热烫工艺的实验研究

对速冻籽姜冻结前的热烫工艺进行了研究,分析了漂烫温度、时间对原料过氧化物酶活性、Vc含量及感官品质带来的影响,确定了漂烫工艺的最佳参数。