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1.
分别以重庆市不同海拔高度采收的4个品种的脐橙(福本、纽荷尔、奉园72-1、圆虹)为原料酿造脐橙酒,从脐橙汁、脐橙酒的理化指标、脐橙酒的香气化合物及感官质量等方面考察不同海拔高度和不同品种脐橙对其酿酒特性的影响。结果表明,4个品种脐橙出汁率均>60%,糖度均>11°Bx,pH在3.09~3.85;高海拔区域的4种脐橙酒均表现出了良好的酿酒特性,在香气和感官分析上花香、果香更明显。福本脐橙酒特征香气化合物主要为癸酸乙酯、D-柠檬烯;纽荷尔脐橙酒的特征香气化合物主要为芳樟醇、辛酸;圆虹脐橙酒特征香气化合物主要为乙酸异戊酯、1-癸醇和萜品醇;奉园72-1脐橙酒特征香气化合物主要为癸酸乙酯、香茅醇和D-柠檬烯。感官分析结果表明,奉园72-1和福本脐橙酒获得了更高的得分,表现出较好的香气和细腻的口感。综上,高海拔区域的奉园72-1和福本更适宜酿酒。  相似文献   

2.
《食品与生活》2010,(2):54-55
“赣南脐橙王”新鲜上市 “赣南脐橙王”产自中国脐橙之乡——江西信丰县富硒生态园,是信丰脐橙中少有的极品,每100斤中只有1斤可称为“赣南脐橙王”,其个大皮薄,肉嫩香甜,汁多爽口,清热去火。信丰县现有脐橙种植面积28万亩,2009年脐橙产量为17万吨,连续三届获得“赣南脐橙王”桂冠。  相似文献   

3.
四个赣南脐橙品种果实贮藏特性的研究   总被引:3,自引:0,他引:3  
通过对纽荷尔脐橙,朋娜脐橙,红肉脐橙和福本脐橙4个赣南脐橙品种果实贮藏期间主要有机物质(可溶性固形物、总糖、可滴定酸、Vc)含量、呼吸强度、失重率和腐烂率的变化趋势进行研究,探讨4个脐橙品种的贮藏特性,结果表明:纽荷尔脐橙最耐贮藏,福本脐橙和朋娜脐橙次之,红肉脐橙耐贮性最差。  相似文献   

4.
通过对纽荷尔脐橙,朋娜脐橙,红肉脐橙和福本脐橙4个赣南脐橙品种果实贮藏期间主要有机物质(可溶性固形物、总糖、可滴定酸、Vc)含量、呼吸强度、失重率和腐烂率的变化趋势进行研究,探讨4个脐橙品种的贮藏特性,结果表明:纽荷尔脐橙最耐贮藏,福本脐橙和朋娜脐橙次之,红肉脐橙耐贮性最差。  相似文献   

5.
研究不同酿酒菌种发酵富川脐橙果酒的发酵规律,以期为富川脐橙的深加工提供理论依据。优化了发酵工艺中的酵母接种量、发酵温度、硫的添加量,结果表明,以安琪RW为发酵菌种,接种量为0.6 g/L,发酵温度为24℃,添加偏重亚硫酸钾60 mg/L条件下酿造的干型脐橙果酒酒精度为11.2%vol,总酸为9 g/L,酒体呈黄色,清亮透明,具有脐橙特殊香甜的果香和醇厚回甘的酒香,具有脐橙果酒典型风味。安琪RW酵母具有较好的发酵性能,富川脐橙果酒发酵生产有较好的应用前景。  相似文献   

6.
卵形体赣南脐橙自动定向运动规律的研究   总被引:1,自引:0,他引:1  
为了研究卵形体赣南脐橙自动定向问题,探讨卵形体赣南脐橙大小头自动定向中轴向运动和翻转运动规律以及最佳装置工作参数。测定了卵形体赣南脐橙基本特性参数,利用卵形体农产品大小头定向运动综合试验台对卵形体赣南脐橙定向运动进行了单因素试验并进行了试验分析,试验表明,卵形体赣南脐橙质心位置偏向小头端,果形为有大小头之分的椭球体。卵形体赣南脐橙定向运动中的轴向运动规律符合交错轴摩擦轮机构的传动原理,翻转运动规律符合凸轮机构的传动原理,建立了卵形体赣南脐橙轴向运动位移、水平偏转角、翻滚距离和导向杆作用距离的理论计算方法,确定最佳装置工作参数为尼龙辊、输送辊直径40mm、输送辊间距30 mm、输送辊转动线速度70 mm/s、导向杆弯曲角度30°。分列翻转式禽蛋大小头自动定向技术对卵形体赣南脐橙定向是可行的。为赣南脐橙定向装置的设计和果形分级加工包装提供理论依据。  相似文献   

7.
采用气相色谱-质谱联用技术测定赣南和其它地区的脐橙挥发性物质,对不同产地脐橙进行代谢组学研究,为赣南脐橙品质保障提供科学依据。通过GC-MS分析脐橙的挥发性成分,经数据库匹配结合相关文献鉴定物质,采用正交偏最小二乘法-判别分析(OPLS-DA)的s-plot图并结合对各组分的贡献率(VIP>1,P<0.05)筛选潜在生物标志物。结果表明,从赣南脐橙中共鉴定出66种挥发性成分,分别为萜烯类、醛类、醇类、酯类、酮类等,其中含量最高的为D-柠檬烯。根据OPLS-DA分析筛选出5个潜在生物标志物,即(1S)-(+)-3-蒈烯、4-蒈烯、壬醛、(Z)-石竹烯、桉烷-3,7(11)-二烯,其可以作为区分赣南脐橙和其它地区脐橙的潜在生物标志物。  相似文献   

8.
采用单因素分析法分析果胶提取工艺,选取液料比、提取温度、提取时间、提取液pH值四个因素对脐橙皮果胶的关键因素进行优化,通过绘制折线图得到果胶提取的最佳条件。结果表明:脐橙皮的最佳工艺参数为液料比20︰1,pH为0.8,提取温度75℃,提取时间80 min,乙醇最终浓度60%,沉淀时间60 min。在此条件下,脐橙皮果胶得率为22.4%,为生产加工脐橙皮果胶提供了低廉、高效、简单的提取方法。  相似文献   

9.
通过测定赣南脐橙和柚子中的砷含量,比较果品不同部位砷积聚的差异,为赣南脐橙和柚子的食用安全提供指导。样品中的砷含量采用硝酸加高氯酸消解、氢化物发生-原子荧光光谱法进行测定。结果显示,赣南脐橙和柚子果肉、果皮中的砷含量均低于食品中的国家限量标准;两种水果果肉中的砷含量都极显著低于果皮;赣南脐橙果肉中砷含量极显著高于柚子果肉,但果皮中砷的含量两者差异不显著。表明赣南脐橙和柚子的果肉较果皮安全,而柚子果肉中可能具有阻碍砷积聚的因素。  相似文献   

10.
以纽荷尔脐橙为原料,通过对外观品质、理化品质、活性成分和精油成分的比较来研究黄龙病对脐橙果实品质的影响。结果表明:脐橙感染黄龙病后,果实质量降低,果皮难以转色;以可溶性糖、可溶性固形物质量分数为代表的果实成熟度指标均明显降低,果实食用品质下降明显;果皮、果肉中橙皮苷的含量均大幅度升高,精油挥发性成分的种类增加90.90%。脐橙果感染黄龙病后,食用品质严重下降,难以达到鲜食的要求;然而其橙皮苷、纤维、精油等功效成分的含量增多,如考虑将其用于副产物的提取,将利于资源的合理利用。本研究旨在为感染黄龙病脐橙果的综合利用提供理论参考。  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.
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   

17.
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   

18.
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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