氘代同位素内标-气相色谱-质谱法测定胆固醇含量鉴别地沟油的研究

采用氘代同位素稀释气相色谱-质谱方法,分析了不同种类植物油和不同来源地沟油中胆固醇含量。本方法的灵敏度和稳定性明显高于文献报道的方法,可以明显鉴别出不同种类的植物油以及植物油与地沟油胆固醇含量的差别,根据测定结果偏离情况可以进行是否添加地沟油的判定。利用该判别依据,参加了两次卫生部组织的地沟油盲样考核,阳性准确率均在90%以上,表明该方法可以作为掺杂地沟油鉴别方法之一。     

The quality of cooking oil used in informal food processing in Malawi: a preliminary study

A survey was conducted in Lilongwe city urban markets in Malawi, to assess the quality of cooking oil used for frying potato chips. Purposive sampling was performed to come up with respondents who were using vegetable oils. A stratified random sampling was used to select the 32 informal food processors who were interviewed using a structured questionnaire. Oil samples were collected from the most commonly used brand of oil. Fifteen respondents were selected and these were divided into three categories of five: those who were not reusing the oil, those who were reusing the oil and those who were preparing potato chips and chicken in the same oil, for chemical analysis. The preliminary results showed that while the majority (59.4%) of the informal food processors discarded the oil after 1 day, 3.1% discarded it after 4 days and another 12.5% after 3 days. A larger proportion of the respondents (40.6%) used the leftover oils at home, 37.5% kept it in oil bottles, 3.1% kept it in plastic papers for reuse the following day. Also, most respondents (57%) indicated dark colour as the sign of oil deterioration, 29% discarded the oil after noticing foam formation while 8.2% and 6.1% said they discarded the oil after noticing a bad smell and food absorbing the oils respectively. A physical observation of the various oils showed that for most of the respondents (34%), the oils were dark brown in colour, in 22%, the oils were slightly dark brown and 16%, the oils were brown. Foam formation was noticed in 13% of the respondents. It was also noted that 91% of the respondents had not been trained or briefed of food quality and safety issues. A chemical analysis of the oils showed high values of free fatty acids (range, 0.84–1.4112 compared with 0.42 in the fresh oil) and peroxide values (range 14.7–16.6 compared with 9.0 in the fresh oil). It may be concluded that the oils being used by the informal food processors in Malawi are of poor quality and so the foods cooked in them may be a health hazard to the consumers and the processors themselves. Although this work in ongoing, it may be recommended at the outset that the health department of the city assemblies should inspect these oils for the good health of the consumers.     

Consumers’ Opinions and Use of Food Labels,Nutrition, and Health Claims: Results from Turkey

This study was conducted to reveal Turkish consumers’ (18–65 years residing 10 cities, n = 1200) opinions and use of food labels, nutrition, and health claims. The majority of both females and males (64.7%, 68.2%) seldom read food labels. Risk for not paying attention to food labels was increased 1.287-fold when the gender was male. The percentage of reading food labels increases as education and income levels of individuals increase (p < 0.05). Expiry dates of foods were the most frequent read item on labels (58.0%). Males mostly read information on label to learn the price of the food (71.0%) while females read it to learn the energy value of food (79.0%). Females had more knowledge on nutrition claims compared to males (p < 0.05). The nutrition claims, which were most frequently read by females and males, were trans fat free (23.5%, 21.0%) and low fat/fat free (23.3%, 20.5%). The claim organic was paid most attention on fruit and vegetables (52.0%). The claim “low cholesterol contributes to maintenance of cardiovascular-health” was the most common health claim read. In summary, Turkish consumer’s behaviour of reading labels and nutrition-health claims could change according to some sociodemographic factors and food products.     

Effect of deep‐fat frying of potato chips and chicken on the quality of soybean oil

The type of products may affect the quality of oil during deep‐fat frying. The quality changes in pure soybean oil during frying of potato chips and chicken drumsticks were evaluated and compared. The oil was subjected to continuous frying at 180°C for a period of 315 min. The parameters used to assess the oil quality were peroxide value (PV), iodine value (IV), free fatty acids (FFA), refractive index (RI) and colour. The percentage of oil absorbed by the two products was determined. The oil was also assessed visually for any change in colour, viscosity, turbidity, flavour and deposit. Results showed that, for both products, PV, IV, FFA, RI and colour changed significantly with time (P < 0.05). Potato absorbed oil during frying (6.9%), whereas chicken released fat into the frying medium (2.4%). When the rates of change of the various parameters in the oils were compared for the two products, significant differences (P < 0.05) were noted for PV and colour only. The oil used during the frying of chicken appeared visually to be at a more advanced stage of deterioration.     

我国油料和植物油的产业安全:基于进口视角的分析

本文从进口的角度,以大豆、油菜籽、棕榈油、豆油和菜籽油为例,通过计算进口依赖性和农业产业安全评价指标,分析了我国油料和植物油进口来源地的可靠性和产业安全状况。得到结论:大豆和豆油的进口可靠性较高,菜籽油和油菜籽的进口可靠性较低,棕榈油居中;棕榈油的产业安全度最低,其次是大豆和豆油,它们都处于危机状态,油菜籽处于不安全状态,菜籽油基本安全。总之,我国油料和植物油的进口供给基本是有保障的,但进口较多使该产业总体处于危机状态。     

The Economic Benefits of Nutrition Labeling: A Case Study for Fresh Meat and Poultry Products

New rules issued by the U.S. Department of Agriculture requiring provision of nutrition information on raw meat and poultry products may encourage consumers to make healthier food choices. Reduced intake of fat and cholesterol may prevent future cases of stroke, heart disease, and cancer. The benefits of these rules are estimated to be $62 to $125 million annually.     

润滑油基础油组成对其性能的影响

介绍了润滑油基础油的组成和目前研究结构组成所用的分析方法，通过分析基础油的结构组成对性能的影响，指出哪些烃类是基础油的理想组分，并从结构组成的角度分析了不同基础油性质的差异，提出未来基础油研究和生产的发展方向。     

Assessing Dynamics of Palm Oil Import Demand: The Case of Six Asian Countries

This article uses annual data to investigate the palm oil import demand in selected Asian countries (India, China, Japan, Bangladesh, Korea, and Pakistan) through using the autoregressive distributed lag (ARDL) technique. The findings of the study show that the palm oil and substitute oils prices and the national income of the importing countries are significant determinants of palm oil demand across the six models. Other factors such as biofuel mandate, trade policies, and exchange rate also proved to be important factors affecting import demand for palm oil in some of these countries.     

Who Uses Food Label Information

Abstract

Consumer psychology suggests that fat intake and search for fat information on food labels may be mutually dependent. This study extends previous research by using a simultaneous-equation model to measure the relationship between fat intake and label use. Using the 1994–6 USDA CSII and DHKS data, our results suggest individuals who consume a higher percentage of calories from fat are less likely to report searching for fat information on food labels. We also identified the roles played by several psychological variables on information search and fat intake. These findings have important implications on nutrition education and effectiveness of food labels.     

The role of dietary information in women's whole milk and low‐fat milk intakes

This study examines the effects of dietary information on women's whole and low‐fat milk intakes. The sample is 1928 female meal planners aged 20 years or over who provided information on their milk intake for 2 days in the 1994–96 Continuing Survey of Food Intakes by Individuals and who completed the 1994–96 Diet and Health Knowledge Survey in the follow‐up interview. The nested Tobit model was used to handle the sequentially censored data. Women's dietary information contributed to reduced whole milk consumption and increased low‐fat milk consumption indicating different effects on whole milk and low‐fat milk consumption.     

Emu

Abstract

People are making food choices based on fat, calories, and cholesterol, while demanding products that are appetizing. Due to such health issues and the convenience of alternative meat products, consumption of beef has declined among American consumers. In this study emu meat and US Select grade beef ribeye steaks were compared for palatability by a 10-member trained sensory panel. Tests for fat (ether) and moisture (vacuum dry) were performed, along with Warner-Bratzler shear tests. Emu meat was rated as more tender, juicier, and more flavorful than the beef ribeye steaks. Wamer-Bratzler shear measurements were consistent with sensory panel findings. Proximate analysis showed the emu steaks contained less fat and more moisture than the beef ribeye steaks. Emu meat is a “red meat” that may ease consumers' concerns about the consumption of red meat. Its potential as a red meat alternative is due to its tender, juicy, flavorful, and lean qualities.     

Media Advocacy: A Case Study of Philip Sokolof's Cholesterol Awareness Campaigns

Elevated blood cholesterol has been identified as a major causal factor underlying heart disease. Through effective use of the mass media, Philip Sokolof was instrumental in increasing cholesterol awareness, forcing major changes in the food industry, and facilitating the passage of tough, new food labeling legislation. Drawing on a variety of published sources and a personal interview with Mr. Sokolof, this article describes his efforts to use the mass media to promote change in the public health domain.     

Food choices in Ethiopia: does nutritional information matter?

This article reports results from a framed market experiment conducted to examine whether milk choices are responsive to changes in the nutritional characteristics of milk products. Using a random‐effect Tobit model, we analyzed experimental data collected from 160 participants in urban Ethiopia. It shows that sensory properties play a key role in the acceptance of reduced‐fat milk while the provision of nutrition information has a mixed effect on a price premium. Further, a substantial percentage of participants were found to have a strong preference for whole milk while only 19% of them prefer reduced‐fat milk with 2.8% price premium. The study unveils a heterogeneous preference for the nutritional quality of milk products. Consumers’ health problems and socio‐demographic characteristics influence their preference for the nutritional quality of milk products. The result also shows a nutrition‐taste tradeoff, yet consumers place more value on sensory experience. Contrary to earlier studies, we found that prior belief about milk quality influences how consumers value sensory experience and nutrition information.     

核磁共振技术在地沟油鉴别中的应用研究

采用布鲁克核磁仪（600兆）做H谱全扫,根据H谱的化学位移和积分面积进行归纳总结,建立了不同种类植物油和不同来源地沟油中H谱变化的规律。本方法一共开发出12个指标对植物油和地沟油进行鉴别,同时引进统计分析方法,在对植物油和地沟油的样本数据库聚类分析基础上,对考核盲样进行判别分析。采用该方法对卫生部两次考核盲样进行判别分析,准确率可达到90%,表明核磁共振方法是一种有效的地沟油鉴别方法。     

气相色谱-质谱法测定脂肪酸组成鉴别地沟油的方法研究

建立了分析油脂样品中37种脂肪酸含量的气相色谱-质谱检测方法,通过对100多种植物油和20多种地沟油的37种脂肪酸含量的分析,总结出了根据37种脂肪酸含量鉴别地沟油的判定依据。低碳数饱和脂肪酸是地沟油与植物油差异较大的组分,但是应用气相色谱方法测定时无法对其进行准确的定性定量,从而无法根据低碳数饱和脂肪酸的组成进行是否地沟油判定。应用气相色谱-质谱方法,提高了方法的灵敏度,完善了根据脂肪酸组成判定地沟油的依据。应用该判定依据,对卫生部两次盲样进行判定,阳性准确率分别为100%和95%,阴性准确率分别为100%和90%,表明该判定依据是一种有效且准确率较高的鉴别地沟油的方法。     

山东口岸进口原油品质分析与对比研究

对近两年山东口岸主要进口的安哥拉和沙特阿拉伯的九种原油进行品质检验,并对数据进行处理和分析。通过所得数据与国外原油公司公布的数据进行对比,得到了一些启示,为今后的原油进口以及检验工作提供一些参考。     

Consumer concern and behaviour regarding food and health in Norway

This study was undertaken to answer four questions. How widespread is the interest in health issues related to food among consumers in Norway? What types of food-related health risks are the consumers concerned about? How is the concern expressed among different groups and subgroups of the population? How is the interest in food and health expressed in terms of food behaviour? The paper is built on results from two nationwide consumer surveys in Norway: one telephone interview including 1,021 persons and one postal questionnaire including 13,857 persons. The data revealed that 72% of the consumers were very or rather concerned that the food they eat could be harmful to health. Contrary to results from some other studies, the majority of the Norwegian consumers (57%) were mostly concerned that the food they eat could contain too much fat. Even though the fat issue attracted most attention, many were also concerned about food additives (39%) and contaminants from environmental pollution (43%). Logistic regression analyses showed that the expression of concern is different in various subgroups of the population, divided according to age, income, education and place of residence, Data on food behaviour confirmed the heavy emphasis that consumers put on the fat issue and on additives in food.     

Food choice,nutrition education and parental influence on British and Korean primary school children

The nutritional status of children can influence their health and the risk factors for developing chronic diseases later in life. Korea is unique in that it is relatively westernized and yet maintains much of the traditional foods and cooking methods. Effective nutrition education should help children to choose a healthy diet through the establishment of positive dietary practices and habits. The main purpose of this research is to compare awareness towards nutrition education between primary schools in the UK and Korea and nutritional knowledge that children and parents have in these countries. Dietary and healthy eating knowledge data were collected by a questionnaire as part of a case study comparison using one primary school in Manchester, UK, and one in Seoul, Korea. A total of 171 primary school children and 124 parents of the children were recruited. The results indicated that children and parents appeared to be aware of the importance of limiting fat, sodium and sugar intakes, and requiring non‐starch polysaccharide (NSP). However, in the case of some foods they did not have satisfactory nutritional knowledge of which foods were high in fat, salt, sugar and NSP. British children had a better understanding of the health implication of fat than Korean children, whereas more Korean children considered excessive salt intake harmful than British children. There seemed to be differences in dietary pattern and familiarity with food between the two countries. Children identified parents as the main source of nutritional information. Therefore, parents as well as children need to learn about nutrition in order to give appropriate information or advice to improve the diets of their children. Children preferred exciting, fun, positive and a practical approach to learning about nutrition, such as computer packages and cookery classes. Parents wanted schools to give their children more information about nutrition. This research has shown that nutrition education in schools should be concerned not only to provide nutritional knowledge but also to encourage children to choose healthy food by redesigning nutrition education and school meals.     

Dietary intake and the contribution of snacks among adolescents during the summer months

Abstract Adolescent diets are often cited as nutritionally inadequate, possibly because of their reported snacking habits. This study examined 48 adolescent diets using a 24-h diet recall and a 2-day food record during summer months. Total intake and snacks identified by the subjects were analysed for energy and nutrient content. Male and female subjects reported similar intakes of fat, cholesterol and sugar. Ninety-eight per cent of subjects reported at least one snack daily. Snacks contributed 25% to the total energy, vitamin C, calcium and magnesium intakes. Although these subjects were not adhering to national recommendations for fat and sugar, the snacks they consumed contributed positively to the nutrient content of adolescent diets.