超临界CO_2流体萃取琉璃苣籽油及其脂肪酸分析

利用超临界CO2流体萃取技术萃取琉璃苣籽油,考察了萃取压力、萃取温度、萃取时间和CO2流量对琉璃苣籽油出油率的影响,并通过正交试验确定了超临界CO2萃取琉璃苣籽油的最佳工艺条件。研究结果表明,超临界CO2萃取琉璃苣籽油的最佳工艺条件为:萃取压力25 MPa,萃取温度45℃,萃取时间2.5 h,CO2流量45 L/h。在此条件下,出油率为28.08%。气相色谱对琉璃苣籽油的脂肪酸组成分析表明,琉璃苣籽油富含油酸、亚油酸和γ-亚麻酸。     

超临界CO2萃取薜荔籽油工艺研究

采用超临界C02萃取技术,对薜荔籽中薜荔籽油的萃取工艺进行探讨.研究粉碎度、萃取压力、萃取温度、C02流量和萃取时间对薜荔籽油出油率的影响.实验表明,超临界CO2萃取薜荔籽油的最佳工艺参数是粉碎度40目、萃取压力25MPa、萃取温度40℃、C02流量25L/h、萃取时间90min,薜荔籽油的出油率最高,达到20.93%.     

花椒籽仁油的超临界CO_2萃取

以碱皂化后的花椒籽为原料,以出油率为指标,采用单因素实验和正交试验优化超临界CO2萃取花椒籽仁油的工艺条件。实验结果表明,在物料粒度40目、物料含水率10%、CO2流量80 L/h、萃取压力35 MPa、萃取温度35℃、萃取时间2.5 h的条件下,花椒籽仁油的出油率达到19.98%,所得花椒籽仁油(毛油)各项质量指标达到花椒籽油GB 22479-2008的二级标准。     

莴苣籽油的超临界CO_2萃取工艺及其脂肪酸组成分析

以莴苣籽为原料,利用超临界CO2对其进行萃取。通过单因素实验考察了萃取压力、萃取温度、萃取时间、CO2流量、一次性投料量、粉碎粒度对莴苣籽油得率的影响。在单因素实验的基础上,采用正交实验优化了超临界CO2萃取莴苣籽油的最佳工艺,并采用气相色谱-质谱(GC-MS)联用技术分析其脂肪酸组成。结果表明,超临界CO2萃取莴苣籽油的最佳工艺条件为:一次性投料量50 g,粉碎粒度24目,萃取压力30 MPa,萃取温度45℃,CO2流量6 L/min和萃取时间4 h。在最佳工艺条件下,莴苣籽油得率为17.92%。莴苣籽油脂肪酸组成主要为亚油酸(56.420%)、油酸(22.562%)、棕榈酸(7.795%),其中不饱和脂肪酸含量为86.682%。     

超临界CO_2提取黑莓籽油工艺研究

目的提高黑莓籽出油率及品质,增加黑莓附加值。方法以黑莓籽为原料,冷冻干燥脱水、冷冻粉碎细化、超临界CO2流体提取黑莓籽油。考察了CO2流量、提取压力、提取温度、提取时间、分离温度和分离压力对黑莓籽出油率的影响,并通过响应面试验确定了超临界CO2提取黑莓籽油的最佳工艺条件。结果超临界CO2提取黑莓籽油的最佳工艺参数为:将黑莓籽经冷冻干燥至含水量3.43%~5.35%,冷冻粉碎过60目筛,选用超临界CO2流体提取压力30 MPa,温度40℃,CO2流量25 L/h,提取时间60 min,分离压力7 MPa,分离温度35℃。在此条件下,出油率达到18.6%。结论此工艺提取的黑莓籽油品质优良,绿色环保。     

辣木籽油的超临界CO_2萃取及其化学成分分析

研究了超临界CO2流体萃取辣木籽油的工艺条件并对其化学成分进行了分析。考察了在超临界CO2条件下,萃取时间、萃取压力、萃取温度、CO2流量和分离温度等因素对出油率的影响,并通过正交试验优化得到最佳工艺条件,最后用GC-MS法测定辣木籽油的化学组成。结果显示最佳工艺条件为:萃取时间180 mm,萃取压力20 MPa,CO2流量20 kg/h,萃取温度35℃,分离温度40℃,在此条件下出油率为36.3%,提取率为97%。GC-MS测定结果显示辣木籽油主要由脂肪酸组成,总的质量分数为92%,其中含油酸65.63%;此外还含有1%~3%的饱和烃(1.07%)、醛和醚(1.76%)、酯(2.85%),1.95%的菜油甾醇、豆甾醇、β-谷甾醇和岩藻甾醇。揭示了用超临界CO2法萃取辣木籽油是可行的;辣木籽油是一种富含油酸、甾醇等功能性成分的植物油。     

葡萄籽油超临界流体萃取工艺

研究了温度、压力、时间、CO2体积流量对超临界流体萃取葡萄籽油得率的影响,并进行了最佳工艺优化.结果表明,影响CO2流体萃取葡萄皮精油效率因素的主次作用为萃取时间＞萃取压力＞萃取温度＞CO2体积流量,最佳工艺条件为萃取时间4 h、萃取温度45 ℃、CO2体积流量8 L/h、萃取压力30 MPa.葡萄籽油出油率为14.8%.     

椪柑籽油超临界提取工艺的优化

利用临界CO2萃取技术提取椪柑籽油。在单因素试验的基础上,采用Box-Behnken中心组合设计对椪柑籽油超临界CO2萃取工艺中的时间、温度、压力和流量4因素的最优化组合参数进行定量研究,得到各因素与椪柑籽油得率关系的数学模型。结果表明:最佳的工艺条件为萃取压力34.4MPa、CO2流量25.8L/h、萃取时间147.6min、萃取温度39.3℃。该条件下,椪柑籽油提取得率的理论值为45.95%,实测值为(45.12±1.36)%(n=3),说明回归模型能较好地预测椪柑籽油的提取得率。     

超临界CO2萃取沙棘籽油及热敏性物质分析

对超临界CO2萃取沙棘籽油及热敏性物质进行分析研究。通过正交试验确定最佳工艺条件:萃取压力25MPa、萃取温度40℃、CO2流量18kg/h、萃取时间120min、分离压力8MPa,在此工艺条件下沙棘籽油出油率为52%。高效液相色谱法检测沙棘籽油中α-VE含量为2.6%,经超临界CO2萃取后热敏性物质α-VE损失3.7%,胡萝卜素含量为100850μg/100g。     

超临界CO_2萃取西伯利亚白刺籽油工艺研究

以西伯利亚白刺籽油的收率为评价指标,在单因素实验基础上,采用L9(34)正交实验优化白刺籽油的超临界CO2萃取工艺条件,并用GC-MS对最佳工艺条件萃取的白刺籽油脂肪酸成分进行分析。结果表明:超临界CO2萃取白刺籽油的最佳工艺条件为萃取压力40 MPa,萃取温度55℃,CO2流量10 L/min。从白刺籽油中分离并鉴定出8种成分,其中不饱和脂肪酸以亚油酸(65.671%)和油酸(25.747%)为主,占总含量的90%以上。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

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.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

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.     

Tests of potential functional barriers for laminated multilayer food packages. Part I: Low molecular weight permeants

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.     

Analysis of benzo[a]pyrene in spiked fatty foods by second derivative synchronous spectrofluorimetry after microwave-assisted treatment of samples

A simple, rapid and inexpensive method has been developed for the determination of benzo[a     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. II: Certification study

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.     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<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     

Chinese CTP Market

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%.     

Preparatory Work of Print China 2015 is Going Smoothly

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     

INFOPRINT 2014 was Successfully Held in Dongguan

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.