凤梨南瓜乳酸发酵保健饮料的研制

以凤梨、南瓜为主要原料，研制发酵型乳酸饮料，用正交试验确定其最佳工艺条件为：凤梨汁：南瓜汁=1：2．混合发酵剂用量为6％，发酵时间为24h。产品具有风味独特、酸甜适口、营养丰富的特性。     

乳酸菌发酵混合乳研究

着重探讨乳酸菌发酵不同比例的混合乳（牛乳和豆乳）的产酸和凝乳工艺条件．结果表明：对豆乳∶牛乳＝２∶１的混合乳中添加１．０％葡萄糖，３．０％蔗糖和２．０％海藻酸钠，接种５％活化的嗜热链球菌和保加利亚杆菌，在４２℃培养６ｈ可获得具有清新的乳酸发酵风味、无豆腥、有乳香、酸味爽口、凝乳良好、口感细腻的混合酸乳     

豆乳和花生乳的乳酸发酵研究

使用MRS培养基分离乳酸菌；通过革兰氏染色、凝乳时间观察和产酸量分析，筛选出生长活力高，产酸能力强的2株酸乳生产菌株：SLlb和SLst。将其以1：1的比例、3％的接种量接入适宜浓度的豆乳或花生乳中，在42℃保温培养2h～3、5h，得到风味纯正、酸甜适口、组织状态较好的酸豆乳和花生酸乳。     

乳酸菌的固定化方法及其发酵特性的研究

对乳酸菌固定化工艺参数及发酵特性进行了研究,结果表明,乳酸菌包埋法固定最佳工艺条件为:海藻酸钠的浓度为2%,菌体的稀释比例为1:1,CaCl2溶液的浓度为1.5%,菌种的固定化温度为42℃。固定化菌种胶珠含菌量为4.59×109个/g。固定化乳酸菌产酸和耐酸能力强,菌种活力得到保持,具有持久和可重复利用的特点。     

PROTEIN CONTENT AND AMINO ACID COMPOSITION OF PROTEIN OF SEEDS FROM TOMATOES AT VARIOUS STAGES OF RIPENESS

Tomato seeds represent a large portion of the waste generated during the processing of liquid tomato products. With mechanical harvest, green fruit also become waste. There was no significant change in either seed protein content or amino acid profile as tomatoes ripened from green mature fruit. Tomato seed protein contains approximately 13% more lysine than soy protein which would allow it to be used in fortifying low lysine foods. These results indicate that seeds from processed fruit, culls, and other waste fruit could be used as a source of protein.     

菜谷系列乳酸发酵饮料工艺与发酵配套工业化条件

在菌种筛选的基础上,进一步对菜谷原料的处理工艺、发酵条件、风味口感以及产品质量稳定性等相关配套条件进行深入研究,优化并建立工艺技术成熟、品种花色多样和色、香、味俱佳的菜谷类乳酸发酵系列产品的生产工艺并具备指导产品的工业化生产的条件.     

德昌水牛乳脂肪酸组成的气相色谱—质谱分析

分析德昌水牛及其杂交后代乳脂肪酸的组成特点.采集德昌水牛及其与尼里拉菲水牛的F1代常乳样品,提取脂肪后进行甲酯化,用气相色谱-质谱联用法测定脂肪酸组成.结果显示,德昌水牛及其F1代乳中的主要脂肪酸为肉豆蔻酸、棕榈酸、油酸、硬脂酸,乳中肉豆蔻酸、棕榈酸比例显著低于F1代,而硬脂酸、油酸比例显著高于F1代.德昌水牛乳脂肪酸组成与牛乳、牦牛乳相比存在一些差异.     

乳酸菌胞外多糖的生理功能及其在发酵乳中的应用

乳酸菌胞外多糖在现代生活的许多领域发挥着重要的作用,具有抗肿瘤活性、免疫调节活性等方面的生理功能,在乳酸菌胞外多糖的生理功能及其在发酵乳中的应用方面进行了概述.     

AMINO ACID COMPOSITION OF SOME BRAZILIAN SEAWEED SPECIES

Fourteen common seaweed species from northeastern Brazil were examined for protein content and amino acid composition. Protein content varied greatly among the species, ranging from 2.30% (dry weight basis) in Corallina offlcinalis to 25.60%, in Amansia multifida. The species Amansia multifida, Caulerpa sertularioides. Enantiocladia dupcrreyi, Solieria filiformis and Vidalia obtusiloba had protein levels comparable to those of many edible legume seeds, above 18%. They showed high levels of acidic amino acids and reasonable levels of essential amino acids, with methionine being the first limiting amino acid for most of the species. The exceptions were Sargassum vulgare that had a very high content of methionine and Caulerpa sertularioides in which lysine is the first limiting amino acid and methionine the second limiting one. All species are rich in phenylalanine/tyrosine and threonine, and six are very good sources of lysine. The potential use of these species as food and/or feed is discussed .     

PRESERVATION OF CARROTS BY LACTIC ACID FERMENTATION

Whole, sliced and shredded Chantenay carrots were subjected to lactic acid fermentation in brines comprised of 1.5, 2.0, 2.5, 3.0% sodium chloride concentrations. One series was fermented by the naturally occurring microflora of the raw carrot and a second series was fermented by a mixed culture of homofermentative and heterofermentative lactic acid bacteria. Although the latter inocula significantly reduced the lag phase of early acid formation, all samples following 21 days incubation attained total acid values in excess of l%, expressed as lactic acid. The volatile-to-nonvolatile acid ratios showed that the lactic acid fermentation of carrots arose as the result of a dominant homofermentative flora. Mild heat treatment of the high-acid product at 71°C produced no adverse changes in color or texture. The resulting flavor of the fermented carrots was judged to be a pleasant composite of carrot, salt and acidic characteristics and most of the crisp texture of the raw carrot was retained.