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1.
为了缓解老陈醋浓醪酒精发酵中高底物浓度和高酒精浓度对酵母菌的抑制作用,以大豆粕与花生粕为原料,通过单因素及正交试验优化生物氮源营养剂制备工艺,并采用响应面法优化浓醪酒精发酵工艺。结果表明,分割式浓醪酒精发酵所需生物氮源营养剂的最优制备工艺参数为:大豆粕与花生粕质量比5∶1、加水量80%、米曲霉接种量0.04%;分割式浓醪酒精发酵的最优工艺参数为:粮水比1.0∶2.7(kg∶L),生物氮源营养剂用量4%,大曲用量20%,最终酒醪的酒精度为12.89%vol。与稀醪酒精发酵相比,分割式浓醪酒精发酵大曲用量节约18%~24%,发酵时间节省16%~20%,酒醪的酒精度提高4.18%vol,所酿造的老陈醋氨基酸态氮及总酯含量分别提高了25%与17%。 相似文献
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木薯粉酒精浓醪发酵条件的优化 总被引:4,自引:2,他引:2
以木薯粉为原料进行浓醪酒精发酵,在前期优化液化糖化条件的基础上,分析了培养基成分以及温度,pH值等条件对发酵的影响。实验结果表明,在优化的液化糖化条件下进行木薯粉浓醪酒精发酵,氮源和无机盐的最适添加量为尿素0.25%(w/w),MgSO4·7H2O0.45g/L,KH2PO41.50g/L,CaCl20.20g/L,发酵最适温度为33℃,最适初始pH4.5,酵母接种量10%(v/v),发酵时间48h。在此条件下发酵成熟醪酒精浓度高达17.2%(v/v),淀粉利用率达91%。 相似文献
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研究用木薯液化滤液对木薯粉调浆进行浓醪酒精发酵的工艺条件。主要利用α-淀粉酶对木薯浆进行液化、过滤处理,重点考察液化时固液比、保温时间、pH值、酶用量等因素对木薯粉液化得率的影响。再用液化滤液对木薯粉调浆进行浓醪酒精发酵试验,考察发酵醪液在整个发酵过程中物料流动性能及发酵效果。结果表明木薯浆液化的固液比为1∶11,pH值为6.2,在90℃以上保温75min,液化酶用量为15U/g。在此工艺条件下木薯粉液化固形物得率为85.10%。使用不同比例液化液对木薯粉调浆至初始总糖为25.5%(w/v)进行浓醪酒精发酵,发酵醪酒精度均达15.0%vol以上。结论:利用木薯液化滤液对木薯粉调浆进行浓醪酒精发酵,发酵醪在发酵过程的流动性增加50%,能够顺利进行浓醪酒精发酵。 相似文献
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木薯粉酒精浓醪发酵条件的优化 总被引:4,自引:1,他引:4
以木薯粉为原料进行浓醪酒精发酵,在前期优化液化糖化条件的基础上,分析了培养基成分以及温度,pH值等条件对发酵的影响.实验结果表明,在优化的液化糖化条件下进行木薯粉浓醪酒精发酵,氮源和无机盐的最适添加量为尿素0.25%(w/w),MgSO4·7H2O 0.45g/L,KH2PO4 1.50g/L,CaCl2 0.20g/L,发酵最适温度为33℃,最适初始pH4.5,酵母接种量100,6(v/v),发酵时间48h.在此条件下发酵成熟醪酒精浓度高达17.2%(v/v),淀粉利用率达91%. 相似文献
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为了利用马铃薯替代部分主要粮食生产食醋,提高马铃薯加工深度,研究以马铃薯替代部分糯米用量,并在糖化阶段额外添加纤维素酶以增进糖化效果,对酒精发酵温度、马铃薯替代部分糯米用量和纤维素酶添加量进行工艺优化,以确定马铃薯醋的酒醅生产工艺的最佳工艺路线。结果表明,马铃薯可替代糯米用量30%、纤维素酶的用量为6 U/g和酒精发酵温度32℃,在此条件下,酒醅的平均酒精度可达11.9%(v/v)。 相似文献
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液态深层发酵酿造枣醋工艺研究 总被引:2,自引:0,他引:2
以金丝小枣为原料,采用液体深层发酵方式酿造枣醋,通过研究酿造过程中酒精发酵阶段酒精度和还原糖的变化,醋酸发酵阶段总酸和酒精度的变化,确定了液态深层发酵酿造枣醋的工艺.结果表明,酒精发酵阶段枣浆的初始糖度13.8%,酵母菌接种量0.03%,发酵温度25°C~30°C,发酵3.5 d结束,酒精度为8.4%(v/v).醋酸发酵阶段的初始酒精度为6.3%(v/v),初始酸度为1.5g/100mL(以醋酸计),醋酸菌接种量10%(v/v),发酵温度31℃,通风量600l/h-10001/h,发酵44h结束,最终酸度达到7.82g/100mL.所酿制的枣醋枣香浓郁,营养丰富. 相似文献
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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
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Sophie Guillot Laurence Peytavi Sylvie Bureau Renaud Boulanger Jean-Paul Lepoutre Jean Crouzet Sabine Schorr-Galindo 《Food chemistry》2006
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
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Jesus Simal-Gandara Miguel Sarria-Vidal Arjen Koorevaar Rinus Rijk 《Food Additives & Contaminants》2000,17(8):703-711
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
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M. S. Garcí a-Falc n J. Simal-G ndara S. T. Carril-Gonz lez-Barros 《Food Additives & Contaminants》2000,17(12):957-964
A simple, rapid and inexpensive method has been developed for the determination of benzo[a 相似文献
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H. J. Van Den Top A. Boenke P. A. Burdaspal J. Bustos H. P. Van Egmond T. Legarda A. Mesego A. Mourino W. E. Paulsch C. Salgado 《Food Additives & Contaminants》2001,18(9):810-824
This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance. 相似文献
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《肉类研究》2014,(2)
<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the 相似文献
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《印刷工业》2014,(11):95-95
According to Printing and Printing Equipment Industries Association of China(PEIAC)'s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%. 相似文献
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《印刷工业》2014,(8):103-103
正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press 相似文献
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《印刷工业》2014,(12):102-103
Sponsored by Printing and Printing Equipment Industries Association of China (PEIAC) and organized by Print China magazine, the Seventeenth Beijing International Printing Information Conference (INFOPRINT 2014) was successfully held on 11th Dec. 2014 at Dongguan Exhibition International Hotel. 相似文献