低聚木糖浆二氧化硫硫漂脱色研究

利用二氧化硫对低聚木糖浆进行硫漂脱色，试验结果表明，低聚木糖浆中的部分色素能与保险粉遇水分解产生二氧化硫反应，从而达到一定的硫漂脱色效果，pH和温度对保险粉硫漂脱色的效果有较大的影响，优化的条件为：保险粉用量0．6％，7－80℃和20min,在此条件下的脱色率可达到43％。硫漂脱色的产品色泽不稳定，但经过离子交换树脂以后，产品的色泽变得稳定。     

发酵法生产魔芋葡甘聚糖酶的研究

目的：探索发酵生产葡甘聚糖酶的最佳条件。方法：在摇瓶培养的基础上，比较不同温度、pH和接种量对发酵反应的影响，并在5L发酵罐上用正交试验筛选最佳的产酶条件配伍。结果：该菌产生葡甘聚糖酶的最佳条件为温度50℃，pH5．5～6．0，接种量10％，发酵前期搅拌速度50rpm，通气量20L／h，6h后搅拌速度改为100rpm，通气量10L／h，在这个条件下发酵获得的酶比活力为4812U／mg，总活力达到7810U／mL。培养8h后细菌生物量、产物含量迅速提高，24h达到顶峰时期。发酵动力学属于偶联型。     

超滤技术纯化大豆糖蜜中低聚糖的研究

对超滤技术纯化大豆糖蜜中的低聚糖进行了研究,探讨了pH和温度对膜分离效果的影响,确定超滤的较优条件为:选用截留相对分子量为10000的膜,pH7.0,温度20℃,采用间断全过滤的操作方式。在此条件下超滤所得的透过液澄清透亮,大分子类蛋白可完全去除,低聚糖透过率达70%。     

UV Absorption microspectrophotometry and digestibility of cell types of bermudagrass internodes at different stages of maturity

The walls of sclerenchyma, vascular bundle sheaths, and parenchyma at different maturities (internodes 2, 5, and 7 from the apex) of bermudagrass [Cynodon dactylon (L) Pers] were analyzed by UV absorption microspectrophotometry, and the results were related to wall digestibility. Sclerenchyma walls from internode 2 were degraded by rumen microorganisms, with only the middle lamella remaining. Undegraded sclerenchyma walls gave a UV absorption spectrum similar to that of p-coumaroyl and feruloyl arabinoxylo-trisaccharides isolated from bermudagrass cell walls. Absorption maxima occurred at ? 245 and 320 nm, together with a shoulder at ? 280 nm. Sclerenchyma from the older internodes 5 and 7 showed only partial degradation of the secondary wall adjacent to the lumen. Spectra of undegraded walls from these internodes showed absorption maxima at ? 245 and 285 nm with a shoulder at ? 320 nm. Spectra of sclerenchyma walls that included the middle lamellae gave a higher absorption at ? 320 nm than did wall layers excluding the middle lamellae. Vascular bundle sheaths generally were similar in digestion patterns and spectra to those of sclerenchyma. Parenchyma cells in internode 2, which were totally degradable, gave low absorbance. Parenchyma cell walls from internodes 5 and 7 were degraded except for the middle lamellae in cells nearest to the sclerenchyma; parenchyma cells nearest to the stem centre were totally degraded. Spectra of parenchyma wall regions that included middle lamellae were similar to the p-coumaroyl and feruloyl arabinoxylo-trisaccharides, and absorbance values were low compared with sclerenchyma and vascular walls. Results suggested that esteror ether-linked phenolic acids accounted for most of the UV absorption in young sclerenchyma and young and old parenchyma; lignin-like aromatics increased in older, poorly digested sclerenchyma as ester/ether-type compounds decreased. An estimation of the amount of ‘ferulic acid equivalents’ of the walls was made assuming all the absorbance at ? λ_max 320 nm was due to ferulic acid; older sclerenchyma walls had the highest values (160 mg g^?1 walls) and parenchyma walls the lowest (11 mg g^?1 walls).     

功能性低聚糖--水苏糖

水苏糖作为一种新兴的功能性低聚糖类 ,其开发和应用日益受到重视。本文介绍了水苏糖的性质、生理功能、制备方法及应用 ,并对其开发应用前景进行了展望。     

高纯度低聚果糖的生产及应用

本文对高纯度低聚果糖生理特性和安全性作了简要阐述，尤其是对低聚果糖的生产及应用方面作了详细的介绍。     

乳汁中的寡糖及在乳品工业中的应用

母乳中的寡糖大约占总糖的10％，根据其核心结构不同可分为12类，其寡糖组分随哺乳期的变化而改变。母乳中的寡糖具有独特的生理功能，对于婴儿的神经系统发育、预防感染和促进正常的肠道微生物生态形成等非常重要，是保证婴儿健康成长的关键因素．目前用于婴儿乳添加剂的寡糖主要有寡聚果糖和寡聚半乳糖。本文讨论了母乳寡糖的结构、消化吸收、生理作用和在乳品工业中的应用。     

低聚糖浆生产工艺研究

本文论述以甘薯淀粉为原料生产低聚糖浆的工艺过程,详细讨论了酶法水解淀粉的技术条件。通过试验性生产,找到了影响淀粉水解物质的主要因素并提供了生产DE值27～30低聚糖浆的理论数据。     

On the presence of Inulin and Oligofructose as natural ingredients in the western diet

The classic definitions of inulin and oligofructose are constructively criticized. It is observed that inulin cannot unequivocally be described as a polydisperse 1‐kestose‐based (GF_n) β(2 ? 1) linear fructan chain, but that inulin always contains small amounts of F_m and branched molecules. This review article describes the presence of inulin and oligofructose in common foodstuffs. Historical data on human consumption add an extra dimension.

Modern analytical techniques (HPLC, LGC, HPAEC‐PAD) are used to check the variety of data mentioned in the literature throughout the past century. Methods to determine inulin and oligofructose in natural foodstuffs (cereals, fruit, and vegetables) are optimized and used to determine the loss of inulin during storage and during preparation of the food.

These findings allow quantification of the amount of inulin and oligofructose in the average daily western diet. The daily per capita intake is estimated to range from 1 to 10 g, depending on geographic, demographic, and other related parameters (age, sex, season, etc.).

Inulin and oligofructose are not measured by classic methods of dietary fiber analysis and consequently are often not mentioned in food tables. Their significant contribution (1 to 10 g/d/per capita) to the dietary fiber fraction (recommended at 25 g/d/per capita) is not taken into account in any nutritional recommendations. In view of this, inulin and oligofructose deserve more attention, both in food composition tables and in diet or nutrition studies.     

从豆清水中提取大豆低聚糖的工艺研究

介绍了从豆清水中提取大豆低聚糖的工业化生产工艺,并对成品大豆低聚糖的基本性质进行了研究.实验选择高温离心分离法脱除豆清水中的蛋白质,温度选择90℃,脱除率达85.12％.选择电渗析法进行脱盐处理,脱除率达85.8％.使用粉末活性炭进一步进行脱色,采用单因素及正交实验对脱色工艺进行研究,最佳脱色工艺为活性炭用量0.3％,40℃下脱色35min,脱色率达83.71％,低聚糖保留率为80.41％.