罗维朋颜色体系实验研究

为解决罗维朋颜色体系量值溯源问题,提出了用光谱光度法研究罗维朋颜色体系。实验数据分析表明：在单波长下,罗维朋滤色片的光谱密度和罗维朋数之间有明显的线性关系;在380～780 nm波长范围内,罗维朋滤色片的积分光密度和罗维朋数之间也有明显的线性关系。通过美国油品化学协会所提供的数据验证了关系式的可靠性。     

油脂色泽快速测定方法

采用逐步线性回归法,对罗维朋比色片在４００～７００ｎｍ波长范围的吸光度值,与罗维朋比色片的标称值进行回归处理,确定了５３５ｎｍ波长为测定油脂罗维朋红值的特定波长。对１４份芝麻油,１８份菜籽油,１５份花生油、玉米油、棉籽油在特定波长处的吸光度值,与其罗维朋红值进行回归处理,相关系数０９０３～０９６４,建立了油色泽快速测定方法,该方法操作简便、快速,测定结果客观、准确。     

葵花油浓缩磷脂的精制技术研究

以葵花油水化油脚脱水制得的葵花油浓缩磷脂为原料,经正己烷除杂和过氧化氢氧化脱色制备精制葵花油浓缩磷脂.结果表明:在料液比为1∶12的条件下,葵花油浓缩磷脂的正己烷不溶物由2.13％降低到0.06％;采用过氧化氢对葵花油浓缩磷脂化学脱色的最佳反应条件为:30％H202溶液添加量5％、反应温度55℃、反应时间50 min,可得到加特纳色标值为6.0的葵花油浓缩磷脂,脱色后葵花油浓缩磷脂的酸价由23.4 mg/g升高到26.9 mg/g.     

油脂色泽测定方法研究进展

综述了油脂色译测定方法的研究进展情况，并指出发展一种客观的油脂色译测定方法的必要性和可行性，展望了采用图像处理方法测定油脂色译的深远意义。     

Lovibond法和分光光度法对茶叶籽油色泽测定的比较研究

研究了Lovibond法和分光光度法对茶叶籽油色泽测定的差异,并探讨了两种方法的优缺点.得到如下结论:茶叶籽油色泽的常规检测可用Lovibond法;若要准确检测可用一般的分光光度法在669nm的波长下检测;另脱色剂等会对茶叶籽油中的的红色最大吸收波长产生影响,其-般在640～690 nm的波长范围内偏移,故精确检测茶叶籽油中的色素含量可通过测定640～690nm波长扫描图下与x轴所围的吸光度面积来测定.     

Comparison of visual and automated colorimeters—An international collaborative study

Color as a fundamental quality of edible oils has been determined primarily by visual comparison methods for many decades. The automatic colorimeters introduced recently made it possible to replace the manually operated visual color instrument, which requires experience to master and is often subject to operator variabilities. A previous study with an automatic colorimeter, Colourscan, to measure the colors of refined and refined bleached cottonseed oils showed good agreement (r ²=0.99) with visual color measurements by means of the Lovibond-AOCS Color Scale. The current work is to establish a broad-scale correlation between the automated colorimeter and visual color measurements. In this international effort, factory-processed refined and refined, bleached, deodorized (RBD) canola, corn, cottonseed, peanut, sunflower and soybean oils, as well as refined palm olein, RBD palm oil, and washed, dried, filtered and deodorized tallow were used. A total of 14 laboratories from the United States and Canada, and 16 laboratories from 12 countries outside of North America, participated in this collaborative study. The results of this study, with statistical analyses, are reported.     

加纳色度法测定脂松香的颜色

采用罗维邦自动比色仪可以直接测定固体脂松香的加纳色度值和颜色级别。同时与Ｅ型罗维邦比色仪和中国松香颜色分级玻璃标准色块测定的结果进行比较。研究表明三种方法测定的脂松香颜色级别的结果基本相一致。     

Determination of oil color by image analysis

An image analysis method was developed to determine oil color based on Lovibond-red according to Chinese standard GB5528-85. For one hue, one feature of image analysis, a negative correlation with the red reading of the Lovibond tintometer (r>0.995) was found. Mathematical models were designed to measure oil color based on image analysis. Fortynine oil samples including peanut oil, soybean oil, fragrant sesame oil, rapeseed oil and cottonseed oil were evaluated to assess the performance of the image analysis models. Good agreement, r ²=0.999, between image analysis values and visual color measurement by using the Lovibond Color Scale was obtained.     

Comparison of visual and automated colorimeter for refined and bleached cottonseed oils

Color as a fundamental quality of edible oils has been determined primarily by visual comparison. The automatic colorimeters introduced recently made it possible to avoid operator variability associated with visual color measurement. The feasibility of using an automatic colorimeter, Colourscan, to measure the color of refined and bleached cottonseed oils was investigated. Good agreement, r²=0.99, between automatic color readings vs. visual color measurement by using the Lovibond-AOCS Color Scale was obtained. Near-linear correlation of light paths from 133.4 to 2.5 mm permits dark oil to be assessed with the automatic colorimeter.     

油脂色泽测定方法研究进展

综述了油脂色泽测定方法的研究进展情况，并指出发展一种客观的油脂色泽测定方法的必要性和可行性。同时，展望了采用图像处理方法测油脂色泽的深远意义。