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1.
甜玉米汁大豆发酵酸奶的研制   总被引:1,自引:1,他引:0  
大豆酸奶工艺设计的实验结果表明,豆乳与牛乳的质量比为3 ∶ 4,果葡糖浆与蔗糖混合添加量为9%,以保加利亚杆菌和嗜热链球菌的混合菌(1 ∶ 1)种作为发酵剂,接种量为4%,发酵温度为43℃,发酵3h后,再配以甜玉米汁,能够生产玉米香味的营养保健型大豆酸奶.  相似文献   

2.
研究了以鲜牛乳、大豆、花生为原料生产原味酸豆乳的最适发酵条件和最佳配方。结果表明,乳糖添加量1.0%,40℃发酵5h,单硬脂酸甘油脂的添加量为0.1%,豆乳:牛乳为3:4,蔗糖的添加量为8%,L-半胱氨酸的添加量为5%时,原味酸豆乳的感官评价最佳。  相似文献   

3.
以牛乳和大豆乳为原料混合发酵酸乳的研究   总被引:2,自引:0,他引:2  
研究了以牛乳和大豆乳为原料,以保加利亚乳酸杆菌和嗜热链球菌为发酵剂混合发酵制造酸乳。结果表明,将豆乳与牛乳以3:l的质量比混合,加入12%的白砂糖、和0.3%的乳化稳定剂,l:l的菌种比例,5%的接种量,在42℃下发酵3.5h,可得到优质的复合酸奶。  相似文献   

4.
乳酸发酵草莓豆乳饮料的研究   总被引:1,自引:0,他引:1  
本发酵草莓豆乳饮料是以水解豆乳和鲜牛奶为主要原料,混合一定量的草莓汁,再配以辅料(蔗糖、酸味剂),接种发酵而成。采用L9(3^4)正交实验,确定乳酸菌发酵豆乳的最佳原料配比为:水解豆乳和鲜奶比例8:2,蔗糖添加量为8%,草莓汁用量10%,柠檬酸用量0.15%,接种量3%,发酵时间7-8小时。产品口感细腻,酸味可口,风味独特,是营养保健型发酵饮品。  相似文献   

5.
金针菇大豆酸奶的研制   总被引:5,自引:4,他引:1  
研究了以金针菇、淡奶粉、大豆为主要原料,同时添加蔗糖、稳定剂等成分,进行乳酸发酵,制成营养保健,特别是具有增智功能的金针菇大豆酸奶。通过试验得出最佳工艺为:淡奶粉:金针菇:水=1:2:5,进一步与豆乳按1:1比例调配后,固形物含量为12%,蔗糖添加量10%,发酵剂4%,稳定剂以复合稳定剂0.20%、CMC0.10%、PGA0.04%混合使用。  相似文献   

6.
大豆酸奶   总被引:7,自引:0,他引:7  
研究了以鲜乳和大豆为原料生产大豆酸奶的最适宜配方及生产条件。结果表明,将豆乳与鲜乳以3:2的质量比混合,加入8%的白砂糖、0.2%的乳化稳定剂,选用保加利亚乳杆菌和嗜热链球菌以1:1的接种量,在45℃下发酵4h,可得到优质的大豆酸奶。  相似文献   

7.
采用牛乳与豆乳混合后再发酵、牛乳发酵后混入豆乳(发酵牛乳无后酸化处理)和单独发酵牛乳,发酵结束4℃后酸化24 h后再混入豆乳3种混合发酵方式制备发酵混合豆乳,探究3种混合发酵方式对发酵混合豆乳贮藏期品质的影响。结果表明,单独发酵牛乳,发酵结束4℃后酸化24 h后再混入豆乳方式可减缓发酵豆乳在贮藏期的后酸化程度,活菌数保持7 log cfu/mL以上,持水力增加,无乳清析出,提高了发酵豆乳的稳定性,贮藏期内发酵豆乳具有良好的感官,颜色微黄,有光泽,口感润滑,有弹性,具有大豆特有的香气,无豆腥味,贮藏期硬度和胶黏性增加,具有良好的咀嚼特性。因此,单独发酵牛乳,发酵结束4℃后酸化24 h后再混入豆乳方式下的产品稳定性更好。  相似文献   

8.
为了充分利用黑豆,同时增加酸奶的品种,以黑豆和牛奶为主要原料,经灭酶、浸泡、磨浆、调配、杀菌和发酵制成黑豆酸奶。经实验确定其最佳工艺条件:接种量为3%、黑豆乳与牛乳配比为3:1、发酵时间为8h、发酵温度为42℃。产品不仅既有普通酸奶特有的风味和营养价值,而且还具有双重保健作用。  相似文献   

9.
研究了以鲜牛乳、大豆、花生为原料生产原味酸豆乳的最适发酵条件和最佳配方.结果表明,乳糖添加量1.0%,40℃发酵5h,单硬脂酸甘油脂的添加量为0.1%,豆乳:牛乳为3:4,蔗糖的添加量为8%,L-半胱氨酸的添加量为5%时,原味酸豆乳的感官评价最佳.  相似文献   

10.
以豆乳为主要原料,添加大豆低聚糖、蔗糖和牛乳,经合理配比后接种保加利亚乳杆菌和嗜热链球菌进行发酵,即可得色泽纯正、风味优良、质地细腻的具有营养保健功能的新型饮品。经系列试验后确定了生产工艺和关键技术参数。  相似文献   

11.
Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.  相似文献   

12.
An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.  相似文献   

13.
The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.  相似文献   

14.
The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.  相似文献   

15.
Capillary electrophoresis (CE) and polarized light microscopy (PLM) were utilized in the detection of the adulteration of locust bean gum with guar gum. For CE analyses, standards of locust bean and guar gums were extracted with 30% CH3CN, removing the residual proteins from the gum matrix. A 8.75 mM NaH2PO4-20.6 mM Na2B4O7 buffer, pH 9, was used to separate these proteins and to identify marker proteins that were present in the guar gum. These markers did not co-migrate with components in the extracts of mechanically processed locust bean gum, and are used as indicators of adulteration. Using PLM with toluidine blue and iodine staining techniques, unadulterated locust bean gum samples were distinguished from mixed samples through the differential staining of components in locust bean versus guar and tara gums. These experiments in the use of CE and PLM provide orthogonal and complementary methods for the verification of 'true' positives and the elimination of 'false' positives.  相似文献   

16.
An investigation is described in which various polyfunctional compounds were applied to wool in attempts to stabilize the temporary improvements in wrinkle-recovery brought about by ‘annealing’. Several reactive systems involving formaldehyde were found to produce the desired permanently improved wrinkle-recovery.  相似文献   

17.
18.
A 9% whey protein (WP) isolate solution at pH 7.0 was heat-denatured at 80°C for 30 min. Size-exclusion HPLC showed that native WP formed soluble aggregates after heat-treatment. Additions of CaCl2 (10–40 mM), NaCl (50–400 mM) or glucono-delta-lactone (GDL, 0.4–2.0%, w/v) or hydrolysis by a protease from Bacillus licheniformis caused gelation of the denatured solution at 45°C. Textural parameters, hardness, adhesiveness, and cohesiveness of the gels so formed changed markedly with concentration of added salts or pH by added GDL. Maximum gel hardness occurred at 200 mM NaCl or pH 4.7. Increasing CaCl2 concentration continuously increased gel hardness. Generally, GDL-induced gels were harder than salt-induced gels, and much harder than the protease-induced gel.  相似文献   

19.
BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H2O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.  相似文献   

20.
《造纸信息》2014,(8):79-79
Ministr y of Industr y and Information Technology confirmed that the main expected targets for energysaving and comprehensive utilization in 2014 are:energy consumption and CO2 emissions per unit of industrial added-value decreases by 4.5%,water consumption per ten thousand Yuan of industrial added-value decreases by7%,comprehensive utilization of industrial solid waste is further improved,and pollution emissions in key industries is markedly reduced.  相似文献   

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