多维产品中微胶囊型维生素含量的测定

介绍了微胶囊型维生素的相关背景,主要研究了该类维生素的检测方法。      

微胶囊型维生素E粉末的研究

本文研究了制造微胶囊型维生素Ｅ粉末的微胶囊化工艺及技术。其工艺过程包括Ｏ／Ｗ型乳化液的制备、均质与喷雾干燥造粒，影响其工艺及产品性能的因素有原料配方、乳化工艺条件、均质压力及喷雾干燥造粒工艺条件。通过实验研究得出：原料配方为维生素Ｅ３０￣４０％、ＨＬＢ值为５￣７的混合乳化剂４￣６％、稳定剂０．２￣０．４％及碳水化合物和蛋白等壁料５５￣６５％，最佳乳化工艺条件为加水量２￣３倍于维生素Ｅ和固型物总重量     

微胶囊型天然维生素E粉末的研制

本文研究了喷雾干燥法制造微胶囊型维生素E粉末的工艺及技术。结果表明 :制造微胶囊型天然维生素E的壁材及其最佳组合为阿拉伯胶∶糊精∶玉米糖浆=22 5%∶25 0 %∶52 5 % ;心材与壁材的适宜比例为6∶5 ;均质压力为30MPa;喷雾进料温度60℃、进料流量150ml/min、进风温度195℃、出风温度70℃。     

聚氨酯型维生素E微胶囊的制备

本论文针对纺织品护肤功能整理,采用界面聚合法,以甲苯二异氰酸酯（TDI）和聚乙二醇（PEG）为预聚单体,研制了聚氨酯型维生素E护肤微胶囊。探讨了扩链反应温度、PEG种类、芯壁质量比对微胶囊化效果的影响。结果表明：选取60℃、PEG400为反应单体、芯壁质量比为1/1.25时,制备的微胶囊粒径分布窄且粒径小,具有较高的微胶囊化产率和适当的有效载量。扫描电镜和动态粒径分析表明,优选工艺下制备的微胶囊呈规则的球状,粒径分布在260~2000nm,平均粒径在500~600nm,适用于纺织品护肤整理。     

高效液相色谱法测定微胶囊中的维生素A

本方法应用罗紫-哥特里方法分离提取微胶囊中的油脂，然后用正相液相法测定油脂中的维生素A。测定方法的变异系数为2．2％；回收率为96．6～110．5％。该方法与十年前的国家标准《食物中维生素A和维生素E的测定方法》相比较，它减少了样品皂化程度，免去了苯并芘(致癌物质)添加剂，具有方法简单、无毒、快速的优点，是测定含油脂较高的微胶囊产品中VA的新方法。     

高效液相色谱法测定微胶囊中的维生素A

应用罗紫－哥特里方法分离提取微胶囊中的油脂，然后用正相液相法测定油脂中的维生素Ａ，测定方法的变异系数为２．２％，回收率为９６．６％～１１０．５％。该方法与１０年前的国家标准《食物中维生素Ａ和维生素Ｅ的测定方法》相比较，它减少了样品皂化程序，免去了苯并芘（致癌物质）添加剂，具有方法简单、无毒、快速的优点，是测定含油脂较高的微胶囊产品中ＶＡ的新方法。     

高效液相色谱法测定微胶囊中的维生素A

本方法应用罗紫－哥特里方法分离提取微胶囊中的油脂,然后用正相液相法测定油脂中的维生素Ａ。测定方法的变异系数为２．２％, 收率为９６．６－１１０．５％。     

高效液相色谱法测定微胶囊中的维生素A

本方法应用罗紫－哥特里方法分离提取微胶囊中的油脂，然后用正相液相法测定油脂中的维生素A。测定方法的变异系数为2．2％；回收率为96．6－110．5％。该方法与十年前的国家标准《食物中维生素A和维生素E的测定方法》相比较，它减少了样品皂化程度，免去了苯并花（致癌物质）添加剂，具有方法简单、无毒、快速的优点，是测定含油脂较高的微胶囊产品中VA的新方法。     

维生素E微胶囊化技术的研究

以产率、效率和维生素E的保留率作为评价指标,得出以喷雾干燥法制取维生素E微胶囊的最佳壁材配方及工艺条件。      

The analysis of vitamin B12 in milk and infant formula: A review

Vitamin B₁₂ plays a vital role in human metabolism and is an essential vitamin obtained predominantly from food of animal origin. Amongst all animal products, naturally occurring vitamin B₁₂ in milk has the highest bioavailability and dairy products are a broad-access source, especially for vegetarian individuals. The dairy industry requires an accurate and highly sensitive detection method for vitamin B₁₂, however, the extremely low concentration and instability of vitamin B₁₂ creates challenges in analysis. This review discusses the application of modern instrumental techniques for analysis of vitamin B₁₂ in milk as well as a variety of sample preparations, together with their respective advantages and drawbacks.     

The vitamin mystique: an analysis of beliefs and reputations of vitamin supplements among a regional sample of grocery shoppers

The objective of the present study was to examine the reputations of vitamin supplements and determine the extent to which supplement reputations among young, middle-aged, and elderly adult men and women correspond to established science. Young, middle-aged and older men and women were recruited as they shopped and were asked to answer a few questions concerning their habits and beliefs about vitamin supplements. The older the participant, the more likely it was they took vitamins; vitamin C was considered most important for all respondents, however, the reputation of vitamin E increased with age. Young and middle-aged women (compared to men) believed vitamin supplements important for health (even if diet is adequate); this was reversed for older men and women.     

The concentration of vitamin C and selenium in serum of volunteers,receiving different vitamin preparations

Dynamics of changes in serum ascorbic acid and selenium concentration as a result of single dose consumption was investigated on 18 volunteers (12 males and 6 females). Pure ascorbic acid and complex preparation intake was shown to effect the serum ascorbic acid level to a lesser extent than pure vitamin C. The highest concentration of both vitamin C and selenium were observed 2 hours after the administration of "Selmevit".     

高效液相色谱法测定乳制品中V_(K_1)方法的改进

探讨一个准确有效的测定乳制品中VK1含量的方法。样品经KOH皂化、石油醚萃取后,用C18分析,以甲醇为流动相,在吸收波长248 nm下检测VK1。结果表明:方法线性范围为0⁴.0μg/m L,线性相关系数为0.999 6,加标回收率≥90.0%,相对标准偏差≤2.0%;方法精密度和回收率均优于GB 5413.10-2010且可同时检测VA,VD,VE,方法快速、准确、有效。     

The vitamin allowance and vitamin requirements of the operators of a chemical plant in the city of Rustavi

Excretion of thiamine, riboflavin, N1-methyl nicotinamide and ascorbic acid with urine, TDP-effect, ascorbic acid and vitamin A content in the blood have shown higher vitamin requirements in the operators, as compared to subjects of the control group, this was caused by unfavourable effects of the chemical factors of the production environment. The levels of the biochemical parameters characterizing normal providing of the operators with vitamins could be achieved by additional vitamins administered to the workers (2 dragees of "Hexavitum").     

Use of high performance liquid chromatography for analysis of vitamin A in food products

High-performance liquid chromatography (HPLC) was used for vitamin A assay in foods and raw materials. Metrological characteristics of this method have been estimated: relative standard deviation was 0.06-0.08, average recovery of vitamin A was 97.3 +/- 2.6 with n = 6, P = 0.95). The statistical analysis of the results obtained with HPLC has shown that it could be successfully used for vitamin A assay in varying foods containing no less than 0.01 mg of vitamin A per 100 g.     

维生素C对成品泡菜中亚硝酸盐含量的影响

目的:测定泡菜中亚硝酸盐含量及维生素C对其中亚硝酸盐含量的影响。方法:利用分光光度法测定亚硝酸盐标准曲线及加入不同浓度维生素C后亚硝酸盐含量的变化,取三种不同的泡菜分别测定亚硝酸盐含量,并加入维生素C,利用分光光度法测定加入前后亚硝酸盐含量变化。结果:三种泡菜中亚硝酸盐含量分别为0.404,0.347,0.280 mg/kg。5 g泡菜中加入维生素1 mg,亚硝酸盐含量从0.311 mg/kg降至0.089 mg/kg,降低约70%。     

The effect of preventive vitamin supplementation on vitamin status and work productivity of conveyer belt workers in light industry

The authors have studied the ways of correcting the vitamin status and influence of vitaminization on working capacity in workwomen in light industry. Prophylactic polyvitaminization (1 dragee of "Undevitum"/day, during 2 months) proved to produce positive effect on the vitamin status parameters (vitamin content in the blood and urine, clinical microsymptoms of vitamin deficiency), and on the dynamics of the physiological parameters of working capacity of workwomen at modern conveyer shoe making industry. It is recommended that persons suffering from chronic diseases influencing vitamin metabolism, first of all those over 45 years, should receive increased doses of prophylactic polyvitamins, thiamine and ascorbic acid, in particular.     

Determination of macro and trace element in multivitamins preparations by inductively coupled plasma optical emission spectrometry with slurry sample introduction

A slurry sampling technique has been utilised for elemental analysis of multivitamins preparations using inductively coupled plasma-emission spectrometry (ICP-OES). For results comparison, samples were mineralised. Slurry concentration 0.1–0.2% m/v in 6% v/v HNO₃, was used. The calibration by water standard solutions, slurry standards and standard additions were tested for determination above-mentioned elements in slurries. The method offers good precision for macro elements (RSD ranged from 5% to 10%). For in-home control sample, the measured concentrations are in satisfactory agreement with independent laboratories. For the analysed multivitamin preparations, the found element concentration is compared to amount declared by producer. The concentrations of Ca, Mg, P, K, Fe, Mn, Zn, Cu and Cr, Ni, V were determined in the range 1000–100,000 and 5–50 μg g⁻¹, respectively. The slurry ICP-OES analysis was found to be suitable for quality control monitoring of multivitamin preparations and could be useful as a routine procedure.