Phytochemical Constituents,Attenuated Total Reflectance Fourier Transform Infrared Analysis and Antimicrobial Activity of Four Plant Leaves Used for Preparing Rice Beer in Assam,India

Phytochemicals content and antimicrobial activity of Artocarpus heterophyllus, Cyclosorus extensa, Oldendia corymbosa, and Alpinia malaccensis were investigated. Maximum alkaloids and terpenoids were found in A. heterophyllus; tannins and saponins in C. extensa; flavonoids, polyphenols, and phytosterols in O. corymbosa and anthraquinone, glycosides, and anthocyaninin A. malaccensis. Aqueous, methanolic, ethyl acetate, and hexane extracts were prepared from all the leaves. Attenuated total reflectance Fourier transform infrared spectrophotometric (ATR-FTIR) analysis revealed that alkanes and alkyl halides were prevalent in all the extracts and the ethyl acetate extracts contained comparatively higher number of functional groups, which were also more effective against Candida albicans, Escherichia coli, and Staphylococcus aureus. The minimum inhibitory concentration values of A. malaccensis against the tested pathogens were found to be lesser than the other species.     

EGSB/生物接触氧化工艺处理啤酒废水

采用EGSB/生物接触氧化工艺处理啤酒废水,当系统经调试、运行稳定后,EGSB反应器负荷达到15kgCOD/(m3.d)左右,对COD、BOD5、SS和去除率分别达98.08%,98.94%和97.2%,出水水质能够满足<啤酒工业污染物排放标准>(GB 19821-2005).     

啤酒中有机氯及拟除虫菊酯残留检测方法研究

建立同时检测啤酒中17种有机氯及拟除虫菊酯农药残留的气相色谱检测方法,样品经过正己烷提取,采用弗罗里硅土柱净化,GC-ECD法同时检测,外标法定量,方法回收率为80.1%～115.5%,RSD为2.10%～6.95%,方法检测限为：0.0003～0.0031 mg/kg。     

改性生物吸附剂对碱性品红的吸附行为研究

为提高生物吸附剂对阳离子染料的吸附能力,本文采用简单的方法制备了均苯四甲酸酐修饰的啤酒酵母和甘蔗渣.实验结果表明:经过修饰后的啤酒酵母和甘蔗渣对阳离子染料碱性品红的吸附量分别为528.1和736.5mg.g-1,是未修饰的3.3和7.6倍,且分别能在630min和645min时达到最大吸附量并保持平衡.离子强度实验表明...     

HL-B型啤酒瓶专用清洗剂的研制

根据国内外啤酒瓶回收及啤酒瓶专用清洗剂技术现状,成功研制HL-B型啤酒瓶专用清洗剂,并成功在厂家投入实际生产,具有去污力强,脱标效果好,洁瓶率高,高效抑制水垢生成,回收瓶洗涤后光洁透亮,无泡,洗涤费用低的特点。     

玉米淀粉在糖化中的应用

本文介绍了玉米淀粉的特性，比较了使用玉米淀粉作辅料的优势及糖化生产中应满足的设备、工艺要求，分析了玉米淀粉代替大米作辅料对啤酒质量的影响。     

Using Faster Gas Chromatography Analyses in Brewing Analytics

Dominant trends in analytical chemistry include miniaturization in sample preparation techniques and faster run times to provide high‐throughput screening, fast process monitoring and fast method development. This study focused on the application of narrow bore gas chromatographic capillary columns, 0.18 mm internal diameter, for brewing analyses. On these capillary columns, faster analyses could be performed compared to conventional GC capillary columns using 0.32 to 0.53 mm internal diameters. The robustness of the state‐of‐the‐art faster capillary gas chromatography, without compromising resolution, has been demonstrated with the analyses of beer flavour compounds such as lower and higher alcohols, esters and other volatile compounds such as acetaldehyde and dimethyl sulphide in beer. These methods were able to reduce sample run times by 60%.     

管式啤酒过滤的优化

依据恒速过滤理论建立起管式啤酒过滤的数学模型 ,应用此方程于啤酒硅藻土过滤过程 ,可以作为管式啤酒过滤优化的理论依据。     

How Foam Appearance Influences the Italian Consumer's Beer Perception and Preference

The current study presents the results of a survey performed to investigate whether different patterns of foam and lacing affect consumer beer preference and the perception of beer characteristics. The impact of three different levels of foam (huge, medium and little) at pouring, and two lacing patterns (very laced to not laced) during consumption, was evaluated on a set of 26 attributes by a panel of Italian beer consumers. Overall, beers which delivered a medium level of foam at pouring were considered by Italian consumers as the best dispensed, the most liked for their visual appearance, the most attractive to consume and the most likely to be purchased. Cluster analysis determined four groups of consumers with different preference patterns for beer foam and expectations for sensory characteristics of the beer. It was found that 80% of consumers preferred a medium level of foam and no lacing, whereas 20% of consumers preferred a high level of foam and lacing. Furthermore, for nearly 40% of consumers, foam and lacing patterns generated expectations regarding beer sweetness, bitterness, fruitiness, perceived level of alcohol, effervescence and the thirst quenching character of the beer.     

Indirect determination of aflatoxin B1 in beer via a multi-commuted optical sensor

This paper reports the determination of aflatoxin B₁ (AFB₁), one of the most carcinogenic substances known. A multi-commuted flow injection–solid phase spectroscopy (FI–SPS) system combined with photochemically induced fluorescence (PIF) was developed, for the first time, for its quantitative determination. A strongly fluorescent degradation product was obtained on-line by irradiation with ultraviolet light. The determination was carried out by measuring the fluorescence intensity of the photo-product at 353/424 (λ _ex/λ _em), once retained on C₁₈ silica-gel filling the flow-cell. A linear dynamic range of 0.09–12?µg?l^?1, detection limit as sensitive as 29?ng?l^?1 and a relative standard deviation (RSD) of 1.4% were obtained. The method proposed was satisfactorily applied to the determination of AFB₁ in different types of beer (normal and non-alcoholic). Hydrophobic compounds were eliminated from beer samples and AFB₁ was extracted with acetonitrile by solid-phase extraction on C₁₈ sorbent. Recoveries of the target compound from spiked beers were between 94 and 106%. The results obtained in the analysis of real samples are in good agreement with those provided by a reference chromatographic method.