Nutritional oil for infant formula food was microencapsulated by the spray drying method with coating materials including maltodextrin （MD）, soy protein isolate （SPI）, and emulsifier （soy lecithin）. Vegetable oi...Nutritional oil for infant formula food was microencapsulated by the spray drying method with coating materials including maltodextrin （MD）, soy protein isolate （SPI）, and emulsifier （soy lecithin）. Vegetable oil blend was prepared by mixing coconut oil, safflower oil and soybean oil at a ratio to achieve a fatty acid profile comparable to human milk fat （HMF）. The fatty acid composition of the product was determined by capillary gas chromatograph. As a result, the composition was as close as possible to that of HMF, it could be used for infant fomular food to make up some deficiencies of milk powder in nutrition and functional properties. Furthermore, the glass transition temperature （Tg） of the wall material was determined by DSC and its Tg was 66.42℃. It provided a theoretical basis for the storage of the product at the normal temperature.展开更多
A series of safety incidents related to domestically-produced infant formulas(DIFs) almost destroyed Chinese consumer confidence in domestic dairy products. Understanding consumer confidence and its effect on consumpt...A series of safety incidents related to domestically-produced infant formulas(DIFs) almost destroyed Chinese consumer confidence in domestic dairy products. Understanding consumer confidence and its effect on consumption behavior is important to restore consumer confidence and enhance the competitiveness of domestic dairy industry. This article first measures Chinese consumer confidence in DIFs safety using a two-dimension scale(optimism and pessimism) and then investigates its effect on consumers’ preferences for DIFs through a choice experiment. Involving 450 consumers residing in Beijing, Tianjin and Shijiazhuang, the experiment elicited information on their preferences for DIFs with six attributes(organic raw milk, farm-to-table traceability, region of origin, quality certification, animal welfare, and price). Our analysis yields four findings. First, Chinese consumers still lack confidence in DIFs safety. Second, quality certification is the most preferred product characteristic, followed by organic raw milk and farm-to-table traceability. Third, serving as a signal of high quality, price exerts a positive impact on choices of DIFs for pessimistic consumers. Finally, consumer preferences for farm-to-table traceability and region of origin are significantly influenced by consumer confidence.展开更多
Objective: To investigate the true incidence of Bacillus cereus(B. cereus) in food and children diarrhea cases. Methods: A total of 110 samples of various dairy products such as raw milk, long life pasteurized milk, y...Objective: To investigate the true incidence of Bacillus cereus(B. cereus) in food and children diarrhea cases. Methods: A total of 110 samples of various dairy products such as raw milk, long life pasteurized milk, yoghurt and infant powdered milk formulas, raw rice, and feces were examined for the presence of B. cereus by selective plating on mannitol-egg-yolk-polymyxin agar. Confirmation of B. cereus was carried out by biochemical tests and PCR. Identification of non-B. cereus isolates was carried out by 16 S r DNA sequencing. Antimicrobial susceptibility was done by disk diffusion method.Results: Overall 35 samples(31.8%, n = 110) yielded Bacillus-like growth. Of which 19 samples(54.28%) were positive for B. cereus. All isolates were positive for enterotoxin production. No psychrotolerant B. cereus strains were detected in all samples. All B. cereus isolates were resistant to penicillin G, but susceptible to vancomycin, erythromycin and clindamycin. Conclusions: The results of this study confirm the importance of including B. cereus in disease control and prevention programs, as well as in routine clinical and food quality control laboratories in both Saudi Arabia and Egypt.展开更多
为解决部分婴幼儿配方食品中矿物元素检测不均的问题,采用干法、湿法、微波法和复溶-微波法对样品进行消解检测,结果表明:干法消解的数据质量最差;湿法与微波消解法检测的结果相比,铜、铁、钾、镁、锰和钠的含量差异不显著(P>0.05),...为解决部分婴幼儿配方食品中矿物元素检测不均的问题,采用干法、湿法、微波法和复溶-微波法对样品进行消解检测,结果表明:干法消解的数据质量最差;湿法与微波消解法检测的结果相比,铜、铁、钾、镁、锰和钠的含量差异不显著(P>0.05),部分矿物元素(铜、铁、钾、钠、磷、锌)检测结果的相对标准偏差(relative standard deviation,RSD)减小,但未达到预期。样品复溶后进行微波消解检测发现,用水复溶后的大部分元素含量偏低,特别是铁,且检测的矿物元素RSD均较大,而用5%硝酸复溶后,元素含量均没有明显偏高和偏低,且RSD均明显减小。因此,通过5%硝酸复溶样品后进行微波消解检测婴幼儿配方食品中的矿物元素,可以解决样品中矿物元素测定结果不均的问题。展开更多
文摘Nutritional oil for infant formula food was microencapsulated by the spray drying method with coating materials including maltodextrin （MD）, soy protein isolate （SPI）, and emulsifier （soy lecithin）. Vegetable oil blend was prepared by mixing coconut oil, safflower oil and soybean oil at a ratio to achieve a fatty acid profile comparable to human milk fat （HMF）. The fatty acid composition of the product was determined by capillary gas chromatograph. As a result, the composition was as close as possible to that of HMF, it could be used for infant fomular food to make up some deficiencies of milk powder in nutrition and functional properties. Furthermore, the glass transition temperature （Tg） of the wall material was determined by DSC and its Tg was 66.42℃. It provided a theoretical basis for the storage of the product at the normal temperature.
基金funded by a grant from the Ministry of Agriculture and Rural Affairs of China (05162130111242003)Sino-Dutch Dairy Development Centre (SDDDC2017R02)
文摘A series of safety incidents related to domestically-produced infant formulas(DIFs) almost destroyed Chinese consumer confidence in domestic dairy products. Understanding consumer confidence and its effect on consumption behavior is important to restore consumer confidence and enhance the competitiveness of domestic dairy industry. This article first measures Chinese consumer confidence in DIFs safety using a two-dimension scale(optimism and pessimism) and then investigates its effect on consumers’ preferences for DIFs through a choice experiment. Involving 450 consumers residing in Beijing, Tianjin and Shijiazhuang, the experiment elicited information on their preferences for DIFs with six attributes(organic raw milk, farm-to-table traceability, region of origin, quality certification, animal welfare, and price). Our analysis yields four findings. First, Chinese consumers still lack confidence in DIFs safety. Second, quality certification is the most preferred product characteristic, followed by organic raw milk and farm-to-table traceability. Third, serving as a signal of high quality, price exerts a positive impact on choices of DIFs for pessimistic consumers. Finally, consumer preferences for farm-to-table traceability and region of origin are significantly influenced by consumer confidence.
文摘Objective: To investigate the true incidence of Bacillus cereus(B. cereus) in food and children diarrhea cases. Methods: A total of 110 samples of various dairy products such as raw milk, long life pasteurized milk, yoghurt and infant powdered milk formulas, raw rice, and feces were examined for the presence of B. cereus by selective plating on mannitol-egg-yolk-polymyxin agar. Confirmation of B. cereus was carried out by biochemical tests and PCR. Identification of non-B. cereus isolates was carried out by 16 S r DNA sequencing. Antimicrobial susceptibility was done by disk diffusion method.Results: Overall 35 samples(31.8%, n = 110) yielded Bacillus-like growth. Of which 19 samples(54.28%) were positive for B. cereus. All isolates were positive for enterotoxin production. No psychrotolerant B. cereus strains were detected in all samples. All B. cereus isolates were resistant to penicillin G, but susceptible to vancomycin, erythromycin and clindamycin. Conclusions: The results of this study confirm the importance of including B. cereus in disease control and prevention programs, as well as in routine clinical and food quality control laboratories in both Saudi Arabia and Egypt.
文摘为解决部分婴幼儿配方食品中矿物元素检测不均的问题,采用干法、湿法、微波法和复溶-微波法对样品进行消解检测,结果表明:干法消解的数据质量最差;湿法与微波消解法检测的结果相比,铜、铁、钾、镁、锰和钠的含量差异不显著(P>0.05),部分矿物元素(铜、铁、钾、钠、磷、锌)检测结果的相对标准偏差(relative standard deviation,RSD)减小,但未达到预期。样品复溶后进行微波消解检测发现,用水复溶后的大部分元素含量偏低,特别是铁,且检测的矿物元素RSD均较大,而用5%硝酸复溶后,元素含量均没有明显偏高和偏低,且RSD均明显减小。因此,通过5%硝酸复溶样品后进行微波消解检测婴幼儿配方食品中的矿物元素,可以解决样品中矿物元素测定结果不均的问题。
