乙醇熏蒸处理对杨梅果实保鲜及抗氧化活性的影响

研究不同乙醇用量熏蒸处理对乌种杨梅果实采后腐烂、品质及抗氧化活性的影响。先将果实置于20℃下用100、250、500μL/L和1000μL/L乙醇熏蒸处理3h,然后转入1℃冷藏8d。结果表明:500μL/L乙醇处理能最显著的抑制杨梅果实贮藏期间腐烂率和细菌总数的上升,降低果实可溶性固形物和可滴定酸损失,维持其较高的硬度及VC含量;同时,乙醇处理还有效抑制了杨梅果实在贮藏期间总酚和总花色苷含量的下降,诱导果实中主要酚类单体物质杨梅黄酮和槲皮素-3-O-芸香苷及花色苷类主要单体物质矢车菊-3-葡萄糖苷的合成,抑制DPPH(1,1-diphenyl-2-picrylhydrazyl)清除率和还原力的下降,从而保持较高的果实抗氧化活性。结论:乙醇处理在杨梅果实保鲜中具有较好的应用前景。     

杨梅多酚的提取及抗氧化活性研究

本研究通过单因素和正交试验优化了超声波辅助提取杨梅多酚的工艺,得出超声波辅助提取杨梅多酚的最佳工艺参数为:浸提液pH 4.0、乙醇浓度40%、超声时间40 min、超声功率400 W。在此最佳工艺条件下,杨梅多酚的提取率为13.147mg/g。并证明杨梅多酚具有较强的抗氧化作用。     

人参果果醋饮料的研制

目的：以人参果为原料研制人参果果醋饮料。方法：通过酒精发酵、醋酸发酵和饮料调配等工艺处理,制取人参果果醋饮料。结果：通过正交试验确定醋酸发酵的工艺条件为pH4.0、发酵温度30℃、发酵时间6d、醋酸菌接种量7%;人参果果醋饮料的配方为果醋原液添加量10%、果醋液含糖量12%、食盐添加量0.4%。结论：本实验所得工艺可制得营养丰富、酸甜适口的人参果果醋饮料。     

Protective effect of the fruits of Terminalia arjuna against cadmium-induced oxidant stress and hepatic cell injury via MAPK activation and mitochondria dependent pathway

Cadmium (Cd), a highly toxic environmental pollutant, induces hepatic disorders. The present study has been undertaken to investigate the protective role of the fruit extract of Terminalia arjuna (AE) against Cd-induced oxidative liver impairment using a murine model. Cadmium reduced hepatocytes viability, activated MAPKs, disturbed Bcl-2 family protein balance, increased reactive oxygen species (ROS) production and induced apoptotic cell death by mitochondria dependent caspases-3 activation. AE treatment, however, suppressed all the apoptotic actions of cadmium. Similarly, mice treated with cadmium altered a number biomarkers related to hepatic oxidative stress and other apoptotic indices. Oral administration of AE both pre and post prevented all the Cd-induced hepatic damages.     

维药刺山柑果实挥发油和脂肪酸成分的GC-MS研究

目的:为了研究刺山柑果实挥发油和脂肪酸的成分。方法:使用气相色谱与质谱联用对刺山柑果实的挥发油和脂肪酸进行分析。结果:检测出46种挥发油,异硫氰酸酯类化合物约占总含量的83．14%;9种脂肪酸,必需脂肪酸含量为63．06%,出油率为15．6%。结论:GC-MS分析结果较好。     

百香果汁褐变抑制剂的试验研究

为比较不同褐变抑制剂对热带水果百香果汁褐变抑制的效果,以百香果为研究对象,选取Vb-Na、植酸、NaC1、CaCl2、抗坏血酸及异抗坏血酸钠作为褐变抑制剂,分别进行单因素和正交抗褐变试验.单因素试验中,抗褐变效果依次为:Vb-Na＞植酸＞抗坏血酸＞异抗坏血酸钠,而NaCl及CaCl2对百香果汁基本不起抗褐变作用.正交试...     

Nutritional constituents and antioxidant properties of indigenous kembayau (Dacryodes rostrata (Blume) H. J. Lam) fruits

The nutritional and antioxidant properties of peels, pulp and seeds of kembayau (Dacryodes rostrata) fruits were evaluated. Kembayau seeds and pulp were rich in fat, while peels had the highest ash contents. Potassium was the most prevalent mineral in peels (380.72-1112.00 mg/100 g). In kembayau fruits, total flavonoid content (1012.74-28,022.28 mg rutin equivalent/100 g) was higher than total phenolic and total monomeric anthocyanin contents. Kembayau seeds exhibited high flavonoid and phenolic contents compared to the contents in peels and pulp. Antioxidant capacities were also higher in seeds as typified by trolox equivalent antioxidant capacity assay (51.39-74.59 mmol TE/100 g), ferric reducing antioxidant power assay (530.05-556.98 mmol Fe²⁺/100 g) and by 1,1-diphenyl-2-picryl hydrazyl radical scavenging activity (92.18-92.19%) when compared to peels and pulp. Pulp and peels of kembayau fruit may be an important source of energy and minerals for human consumption, while seeds have a good potential as antioxidants.     

野生猕猴桃果酒发酵原料筛选与最佳配比研究

以野生猕猴桃汁、大米、玉米粉、蔗糖为原料,通过L16(45)正交试验,以产酒为指标,结合发酵液状态及果酒口感,进行野生猕猴桃果酒发酵原料最佳配方的筛选。结果表明,野生猕猴桃果酒最佳的发酵原料配比为:大米6%,猕猴桃汁35%,蔗糖8%,玉米粉无需添加。以此组合酿制所得的猕猴桃果酒具猕猴桃果汁的天然色泽且口感较好,其酒精度为8.9%vol。