贡柑果酒蒸馏过程中高级醇含量变化研究

采用顶空回相微萃取技术与气质联用法对贡柑蒸馏酒中的挥发性成分进行研究,共鉴定出47种物质,可以初步确认十三醇、顺-9-十六烯醇、顺-9-十八烯醇、乙酸4-萜烯醇酯、2-甲氧基-1,3-二氧戊环是贡柑蒸馏酒的特有风味物质。采用气相色谱法对酒样中的高级醇连行定性与定量分析,研究3种主要高级醇的浓度在整个蒸馏过程中的变化规律。     

胡萝卜、橙复合果肉饮料稳定性研究

以胡萝卜浆和橙浆为主要原料制作复合果肉饮料。探讨了胡萝卜浆与橙浆的配比、均质、杀菌等因素对胡萝卜、橙复合果肉饮料稳定性的影响。研究结果表明：胡萝卜浆与橙浆按3：1的比例配比,添加白砂糖8.0%、柠檬酸0.23%、羧甲基纤维素钠（CMC-Na）0.10%、黄原胶0.08%,在26MPa压力下均质,产品保持6个月不分层,稳定效果好,口感及色香味俱佳;杀菌后室温贮藏1年,卫生指标符合国家标准。     

Nondestructive measurement of soluble solid content of navel orange fruit by visible-NIR spectrometric technique with PLSR and PCA-BPNN

A relationship was established between the soluble solid content (SSC) of navel orange fruit determined by destructive measurement and visible-near infrared diffuse reflectance spectra in the wavelength range of 350-1800 nm. Multiplicative scatter correction (MSC) and standard normal variate correction (SNV) were applied to the spectra, partial least squares regression (PLSR) and back propagation neural network (BPNN) based on principal component analysis (PCA) were used to develop the models for predicting the SSC of intact navel orange fruit. Thirty-eight unknown samples were used to evaluate the performance of these models. The principal component analysis-back propagation (PCA-BPNN) method with MSC spectral pretreatment obtain the best predictive results, resulting in correlation coefficient, root mean square error of prediction (RMSEP), average difference between predicted and measured values (Bias) of 0.90, 0.68 °Brix and 0.16 °Brix, respectively. Experimental results indicate that PCA-BPNN is a suitable tool to model the non-linear complex system, with additional advantages over PLSR, and the vis/NIR spectrometric technique can be used for measuring the SSC of intact navel orange fruit, nondestructively.     

R40型转杯纺纱机关键器材的优选配置

为了生产高质量的转杯纺纱线,对立达公司的短流程R40转杯纺生产线的关键纺纱器材,如：阻捻头、假捻器、纺杯和分梳辊等进行了优选。试验结果显示：表面螺旋结构的KS型阻捻头成纱奈干好,毛羽少,强力高;KSNX型阻捻头成纱手感柔软,适纺针织纱;表面带沟槽的K4K型阻捻头成纱蓬松,适纺牛仔布用纱;40-XTC-BD型纺杯适纺83．3tex等粗号纱;33-XT-BD型纺杯适纺29tex等较细号纱;另外,用B20ON-64型分梳辊纺纯棉29tex纱,以8kr／min,排杂补风全关为宜;纺83．3tex补风口开1/2为宜。最后指出,应结合客户要求选择关键纺纱器材和工艺参数才能纺好转杯纱。     

黄麻纤维活性炭对亚甲基蓝和甲基橙溶液的吸附性能研究

以黄麻纤维为原料,采用磷酸活化法制得黄麻纤维活性炭作为吸附剂,以纺织印染加工中较为常用的亚甲基蓝(MB)和甲基橙(MO)染料溶液为吸附质,研究染料溶液初始浓度、活性炭投加量、吸附时间等因素对黄麻纤维活性炭吸附性能的影响.结果表明:随着染料溶液初始浓度的增加,两种染料的去除率逐渐降低,吸附量逐渐增大;随着活性炭投加量的增加和吸附时间的延长,两种染料的去除率和吸附量均呈现逐渐增大的变化规律;水浴温度对两种染料的去除率和吸附量影响都较小;染料溶液pH值对两种染料吸附性能的影响存在较大差异,MB的去除率和吸附量随染料溶液pH值增加而增大,而MO的去除率和吸附量随之减小.     

Juice of New citrus hybrids (Citrus clementina Hort. ex Tan.×C. sinensis L. Osbeck) as a source of natural antioxidants

Fruit juices of pigmented and non-pigmented new citrus hybrids obtained by crossing clementine cv. Oroval with different cultivars of blood oranges were analysed to determine parameters related to fruit quality (total soluble solids titratable acidity, pH), and the content of ascorbic acid, total phenolics, flavanones, anthocyanins and phenolic acids. Antioxidant properties were evaluated by oxygen radical absorbance capacity (ORAC), and inhibition of induced linoleic acid peroxidation (InLAP) assays. The results of this study show that some hybrids with high antioxidant activity owing to considerable polyphenol content may be considered rich sources of phytochemicals. The OTA 9 hybrid was shown to be richest in polyphenols, suggesting that consumption of OTA 9 fruit or juice could be useful in health promotion and a disease-preventing diet. Moreover, the juice of this hybrid could be used as raw material to produce antioxidant ingredients for dietary, pharmaceutical, or cosmetic purposes.     

桔子果酒的发酵工艺优化

以四川桔为原料,对桔子果酒发酵工艺参数进行优化。比较两株果酒酵母的发酵性能,单因素试验基础上对发酵初始糖度、发酵温度、初始pH值和酵母菌接种量进行L9（34）正交试验。发酵性能结果表明果酒酵母菌株1为最佳发酵菌株,影响桔子果酒感官品质的各因素主次顺序为发酵温度〉酵母接种量〉初始糖度〉初始pH,结合酒精度和感官综合评分控制主发酵温度为21℃、酵母接种量为6%、初始糖度为20%和初始pH 3.4的条件下选用果酒酵母1发酵新鲜桔子全汁,可以获得口感、香气适宜的桔子果酒。     

肉桂精油对紫金春甜桔贮藏保鲜的影响

以紫金春甜桔为试材,研究了室温贮藏条件下,3种不同浓度肉桂精油浸洗处理后果实生理生化及营养成分的变化规律。结果表明：适宜的肉桂精油浓度处理可有效抑制春甜桔的呼吸强度,减少果实失重,降低烂果率;显著抑制贮藏后期果实酸、糖及Vc含量的下降和丙二醛含量的积累,减缓膜脂过氧化作用,延缓果实的衰老进程。其中以肉桂精油浓度为15μL／L的处理保鲜效果最好,贮藏54d能较好地保持果实原有的风味与鲜度。     

米根霉固态发酵橘皮产纤维素酶工艺的优化

以橘皮为原料,以米根霉为生产菌株,采用固态发酵法生产纤维素酶。通过单因子试验分别考察了发酵培养基水分含量、接种量及培养时间三个重要因子对纤维素酶活力的影响,在此基础上,采用Box-Behnken设计对产酶工艺进行优化,利用Design Expert软件对试验数据进行回归拟合和方差分析,最终确定产酶最优工艺条件为:发酵培养基水分含量12.24 mL,接种量10.76%,培养时间72.64 h,在最优条件下所得纤维素酶的酶活力为464.33 U/g。     

贡柑果酒酿造工艺的研究

以贡柑为原料,经打浆、酶解和脱苦等预处理,对贡柑果酒酿造的工艺参数等进行研究;以初始pH值、接种量、SO2添加量和发酵温度为因素,做4因素3水平的正交试验.结果表明,贡柑果汁经0.6％β-环糊精处理80min,酵母接种量为0.06％,二氧化硫添加量为90mg/L,初始pH值为4.5,发酵温度为33℃,发酵周期为7d,可得到浅黄色、澄清透明、风味好、营养丰富的贡柑果酒.