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1.
    
In this study, the antioxidant and antimicrobial activities, total phenolic content, and essential oil composition of Echinophora tenuifolia L. subsp. sibthorpiana were investigated. The antioxidant activity of investigated essential oil was assessed by ABTS and DPPH assays. DPPH radical scavenging activity expressed by IC50 was 2.84 g/L, whereas the TEAC value determined by ABTS assay was 0.032 g TEAC/kg plant. Total phenol content of essential oil determined by Folin-Ciocalteu method was calculated as 1.32 g GAE/kg plant. The essential oil extracted by hydrodistillation (Clevenger apparatus) was investigated by GC-MS technique and 78 compounds were identified. The main components of essential oils were found to be δ-3-carene (17.93%), p-cymene (8.99%), methyleugenol (16.41%), and α-phellandrene (9.33%). The antimicrobial activity of investigated essential oil was tested using a broth dilution method against 13 bacterial and 2 fungal microorganisms. The lowest minimum inhibitory concentration of essential oil against Bacillus cereus was 62.5 μg/mL while the antifungal activity was greater than 1000 μg/mL for both Candida albicans and Saccharomyces cereviciae. Investigated essential oil has a certain level of antioxidant and antimicrobial effects, which may be attributed to their chemical compounds. The antimicrobial efficiency of essential oil, especially against Bacillus cereus and Staphylocoocus spp., offers its effectiveness to treatment of wound or disease caused by Gram positive bacteria.  相似文献   

2.
国内外粮食行业主要使用的熏蒸杀虫剂有两种:磷化氢和硫酰氟。磷化氢是“王牌”储粮熏蒸杀虫剂,硫酰氟主要作为磷化氢抗药性管理用药,两者有一定的互补性。针对我国储粮害虫防治技术应用现状、防控面临的问题和挑战,调研和梳理了国内外储粮熏蒸杀虫剂磷化铝(磷化氢)的基本技术特性、主要生产企业、产销情况、应用技术、残留问题、残渣处置方法、及其应用主导地位;结合国内外情况,综述了硫酰氟熏蒸杀虫技术特性、与磷化氢的关系、需求量、应用特点及存在问题,提出了要系统开展硫酰氟熏蒸杀虫技术研究、深入开展其对环境影响研究的建议和必要性,以遵从“绿色、生态、经济、高效”理念,为我国储粮害虫综合防治科学技术发展提供参考。  相似文献   

3.
硫酰氟属广谱熏蒸剂杀虫剂,于上世纪五十年代在美国进行了首次杀虫剂药品注册。但用作食品(粮食)熏蒸剂,在国际上仅有十几年的历史。主要源于其存在的问题比较突出。针对存在问题,“减少施药量、减少残留、减少排放”是硫酰氟熏蒸杀虫技术发展的必然要求,研究开发“低剂量、低残留、低排放”的硫酰氟高效熏蒸杀虫技术或许是其可行的技术途径。  相似文献   

4.
目的分析河源地区5个产粮区的大米、市售常见品牌中6种玉米淀粉和河源2家城市自来水中铝元素的含量情况。方法对河源5个主要产粮区的共计200批次大米进行采样,对市售玉米淀粉随机抽取6个品牌共60批次样品,以及对河源两家饮用供水系统连续30 d取水样各30次,采用GB 5009.182-2017《食品安全国家标准食品中铝的测定》分别对大米、玉米淀粉和饮用水中铝元素进行测定。结果以欧盟确定的面制品中铝限量标准为参考,所抽的200批大米中,不合格样品有4批,总体不合格率为2.0%;所抽市售玉米淀粉铝60批,不合格样品有3批,总体不合格率为5.0%;东江河东源段供水系统中测定铝含量介于0.053~0.071 mg/L,平均含量为0.066 mg/L;新丰江供水系统中测定铝含量介于0.042~0.064 mg/L,平均含量为0.058 mg/L。估算出河源米粉原料带入的铝含量最高值为14.15 mg/kg。结论原料中铝检出情况证明河源米粉在不添加含铝添加剂的情况下也可能存在铝的残留,应引起相关部门的注意。同时建议尽快制定米粉制品中形态铝标准方法和米粉制品中铝元素限量标准。  相似文献   

5.
    
The addition of pickling herb (Echinophora tenuifolia L.; PHET) resulted in increase in the total phenolic and flavonoid contents in Tarhana in both free and bound fractions' extracts. The antioxidant activity of Tarhana containing 2%, 6% and 18% PHET was 81.45–81.72% in bound fraction whereas in free fraction it was up to 88.27% (6% PHET). The gallic acid contents of Tarhana with PHET in free fraction were between 0.49 mg L−1 (10%) and 2.75% (14%) and that in bound fraction varied between 0.36 mg L−1 (10%) and 3.61 mg L−1 (18%). Statistically significant differences (with control) were observed among the contents of individual phenolic compounds in free and bound fractions of Tarhana depending on PHET concentrations. The addition of higher PHET contents in Tarhana showed negative effects hence, a low concentration (2%) of PHET is recommendable for Tarhana with enhanced nutritional properties.  相似文献   

6.
郝利民  王玉  李政  贾士儒  邢新会 《食品科学》2006,27(12):381-384
本实验将非水造粒技术与泡腾技术相结合,成功地研制出泡腾饮片生产新工艺,解决了无重压设备一次压片成型的技术问题。确定了制片压力、润湿剂无水乙醇和粘合剂聚乙烯吡咯烷酮为影响崩解时间和片剂硬度的主要影响因素。减少无水乙醇的添加量,增加聚乙烯吡咯烷酮的添加量或增大制片压力,均可获得较大硬度的片剂,但片剂崩解时间延长。通过F检验法和t检验法验证了泡腾饮片的片剂硬度与其崩解时间呈一元线性相关关系,回归方程为y=10.482x+135.68。综合考虑各因素,得到制备最佳片剂硬度和崩解时间的配方为:无水乙醇120mg、聚乙烯吡咯烷酮180mg、制片压力4.9×103kgf。  相似文献   

7.
白藜芦醇对多柔比星引起的心脏毒性保护作用研究进展   总被引:1,自引:0,他引:1  
近年来,天然来源的生物活性物质备受消费者青睐.天然产物,尤其是食源性活性成分,作为对人体某种或多种机能有益的功能成分,与维持生命所需的多种生理功能密切相关,已成为当代社会营养保健和健康管理的选择趋势.抗肿瘤药物多柔比星介导的心肌损伤是其临床中较为常见的毒副作用,且所涉及心肌损伤机制错综复杂,限制了其在临床上的应用.白藜...  相似文献   

8.
    
Abstract: This study was undertaken to determine the chemical composition and antioxidative capacity of Echinophora platyloba DC. essential oil, and its antimicrobial potency against Listeria monocytogenes, Bacillus cereus, Bacillus subtilis, Staphylococcus aureus, Salmonella typhimurium, Escherichia coli O157:H7, Pseudomonas aeruginosa, Candida albicans, Candida tropicalis, Rhodotorula rubra, and Rhodotorula mucilaginosa. The essential oil was analyzed by GC and GC‐MS; and evaluated for its antioxidative and antimicrobial (singly or in combination with chitosan, nisin, monolaurin, or amphotericin B) activity. Thirty‐three components were characterized representing 95.69% of the total oil composition in which thymol, trans‐ocimene, carvacrol, and (E)‐sesqui‐lavandulol were the major constituents. The oil exhibited high scavenging (IC50: 49.7 ± 2.3 μg/mL) and relative antioxidative activity (RAA%: 85.21 ± 0.4) in 1,1‐diphenyl‐2‐picrylhydrazyl radicals and β‐carotene/linoleic acid bleaching assays, respectively. The oil showed antimicrobial activity against L. monocytogenes, B. cereus, B. subtilis, S. aureus, S. typhimurium, E. coli O157:H7, P. aeruginosa, C. albicans, C. tropicalis, R. Rubra, and R. mucilaginosa. Moreover, R. mucilaginosa and P. aeruginosa were the most susceptible and most resistant organisms, respectively. Regarding the checkerboard data, 47 fractional inhibitory concentration index (FICIs) (≤0.5) indicated synergistic, whereas 7 FICIs (>0.5 to 1) indicated additive effect. Consequently, E. platyloba DC. essential oil could be used as a recommended natural antioxidant and antimicrobial substance for food preservation.  相似文献   

9.
顶空-气相色谱法测定木耳中的磷化铝残留量   总被引:1,自引:1,他引:0  
目的建立木耳中磷化铝残留量的顶空-气相色谱检测方法。方法将样品称量于顶空进样瓶中,加入硫酸溶液,使磷化铝与酸反应生成磷化氢,用气相色谱-氮磷检测器检测磷化氢的含量,得到样品中磷化铝的含量。结果磷化铝在0.05~5.00 mg线性关系良好,相关系数0.995,加标回收率在83.4%~112.6%,相对标准偏差为9.4%~10.2%之间,方法检出限为0.02 mg/kg。结论该方法快速简便、灵敏度高、准确性好,满足相关法规的限量要求,可用于木耳中磷化铝含量的实际检测工作。  相似文献   

10.
目的 研究统计过程控制(statistical process control, SPC)在保健品片剂片重控制中的应用。方法 以某企业保健品片剂压片过程中的片重控制为例, 收集压片装量数据, 计算样本标准差, 制作压片装量X-S控制图, 通过分析保健品片剂压片的过程能力指数发现过程异常点, 通过5WHY分析, 找到异常的根本原因并制定纠正预防措施, 将措施落实到 HACCP计划中执行。结果 4、5、6、9 h的样本标准差超出控制限, 属于异常现象, 分析找到的原因包括设备供料不及时、过程压力大和员工未按要求清洁等。采取改进措施后, 过程能力级别由Ⅴ级提高到了Ⅱ级, 过程能力指数提高了72%, 产品的不合格率降低。结论 统计过程控制作为压片片重控制的工具, 能够提高保健品片剂生产过程中片中的稳定性和过程能力。本研究可为统计过程控制在保健品片剂片重控制生产外的其他工序或其他保健食品生产过程中的应用奠定基础。  相似文献   

11.
To avoid the traditional and time consuming hydrodistillation, the analyses of volatile components in aerial parts of Echinophora platyloba DC was carried out by a simple microwave distillation followed by headspace single drop microextraction (MD–HS–SDME) coupled to gas chromatography–mass spectrometry (GC–MS). The headspace volatile compounds were collected after irradiation using a single drop of n-heptadecan. The extraction conditions were optimised using the relative peak areas as index. The chemical composition of the MD–HS–SDME extracts was confirmed according to their retention indexes and mass spectra. Fifty-three components were extracted and identified by using the MD–HS–SDME method. E-β-ocimene (53.81%), R-d-decalactone (12.75%), α-pinene (6.43%), n-heptanol (6.27%), β-phellanderne (2.70%) and linalool (1.89%) were the major constituents.  相似文献   

12.
无糖片糖的研制   总被引:1,自引:0,他引:1  
本文探讨了无糖片糖各因素的影响及最佳工艺参数。结果表明:决定无糖片糖硬度的主要因素为糖醇的粒度与压片机的压力,颗粒目数和压力大小均与硬度成正比且影响显著,其次为物料混合时间长短和润滑剂添加量,而抗粘剂的添加量对产品硬度影响不显著。  相似文献   

13.
目的 研究危害分析临界点控制(hazard analysis critical control point, HACCP)体系与统计过程控制(statistical process control, SPC)的基本理论与思想在片剂保健品生产中的应用。方法 利用HACCP的原理与SPC进行相结合的理论基础, 从片剂保健品人员、设备、物料、法规、环境、软件、公用介质等几个方面进行结合分析, 找到异常的根本原因并制定纠正预防措施, 将措施落实到生产中执行。结果 从生产过程中得出某产品压片工序为异常和高风险工序, 工序过程能力指数(process capability index)CPK为0.22, 分析原因为压片工序转台不稳定, 装量波动大, 采取改进措施后CPK为1.45, 过程能力级别由Ⅴ级提高到了Ⅱ级, 工序过程能力得到提高, 产品的不合格率降低。结论 该研究有效和科学地保证了片剂保健品质量安全, 降低企业管理成本, 提高企业行业竞争力和社会知名度。  相似文献   

14.
本实验以雄蜂蜂体为主要原料,研制出食用方便且风味、口感、性能俱佳的雄蜂蜂体营养片产品,采用L9(43)正交试验进行配方优选,并比较了不同润滑剂、不同压片方法对压片效果的影响。实验结果表明,影响雄蜂蜂体营养片口感的原辅料主次顺序依次为柠檬酸>雄蜂蜂体粉>阿斯巴甜>蔗糖,优化的最佳雄蜂蜂体营养片配方为:雄蜂蜂体粉20g/100g、蔗糖20g/100g、阿斯巴甜300mg/100g和柠檬酸300mg/100g。采用制粒压片法,以硬脂酸镁、微粉硅胶为润滑剂,压片效果好,压片过程中不黏冲,成品表面点状颗粒分布均匀、整洁有光泽,片结实、不易碎。  相似文献   

15.
烟草灰霉病侵染条件的研究   总被引:3,自引:0,他引:3  
烟草灰霉病是黑龙江烟区新发现病害,个别地块已造成严重损失。自1990~1995年利用田间试验和控制条件接种方法,研究了烟草灰霉病病菌侵染来源和侵染规律,试验发现:①灰霉病菌Botrytiscinerea侵染烟株的最适宜温度在18℃左右,9℃以下或27℃以上不能发生侵染,该菌发生侵染还必须满足9h以上的湿润时间,12~24h持续湿润利于侵染,光照对病菌侵染有抑制作用。②病菌的侵染来源主要是来自烟株病残体产生的分生孢子。③黑龙江烟区有两个侵染高峰,一个在6月中、下旬,另一个在8月中、下旬。这期间低温、多雨侵染率较高。  相似文献   

16.
采用国家标准GB/T23374-2009《食品中铝的测定电感耦合等离子体质谱法》测定3种米粉样品中的铝含量,根据结果分析该方法在实际应用中的改进策略,从干扰消除、样品消解、标准溶液配制和仪器测定条件等方面提出优化改进措施,并对其有效性进行了测试验证。试验结果表明,改进方法的精密度、重复性和准确度均有较为明显的提高。  相似文献   

17.
敌敌畏、磷化铝混合自然潮解环流熏蒸杀虫技术探索   总被引:1,自引:0,他引:1  
介绍了敌敌畏与磷化铝混合粮面施药、自然潮解环流熏蒸试验。研究表明,敌敌畏与磷化铝混合环流熏蒸几乎对所有储粮害虫均有较好的熏杀效果,尤其是对书虱、螨类、谷蠹等抗药性害虫熏杀效果更为明显,与仓外投药环流熏蒸相比,大大降低了熏蒸费用,缩短了投药时间。  相似文献   

18.
丽江玛卡片和秘鲁玛卡片营养成分对比分析和评价   总被引:3,自引:0,他引:3  
孙晓东  杜萍  单云  杨俊  张先俊  姚敏  杨勇武  张晶 《食品科学》2011,32(19):214-216
目的:将丽江玛卡片与秘鲁玛卡片的营养成分进行分析,观察两种片剂在营养价值上的异同。方法:采用国标方法测定两种片剂中的蛋白质、氨基酸、脂肪、脂肪酸、粗纤维、维生素和10种矿物质等营养成分含量并进行比较。结果:两种片剂在营养组成和含量上基本相似,但丽江玛卡片在脂肪、铁元素含量上明显低于秘鲁,而在精氨酸含量和不饱和脂肪酸相对含量上高于秘鲁玛卡片。结论:玛卡具有较高的营养价值,可以进一步引种和开发该资源。  相似文献   

19.
纸面石膏板是以建筑石膏为主要原料,掺入适量添加剂与纤维做板芯,以特制的纸板为护面,经加工制成的板材,是一种质轻、具有一定强度和良好防火、隔热、隔音、抗震性能的弹性板材.生产1m2纸面石膏板约需要石膏板护面纸0.5k g,由石膏板护面纸影响纸面石膏板板面质量的原因有板面起沟,板面搓皮、起毛,板面分层、起泡,纸与石膏粘接不牢,成纸强度低,跑边、荷叶边等,本文主要叙述石膏板护面纸起沟纸病在生产过程中的控制.  相似文献   

20.
    
Ghrelin exhibits a cardioprotective effect. We examined whether orally administered ghrelin‐containing salmon stomach extract (sSE) instead of chemically synthesized ghrelin protects against doxorubicin (DOX)‐induced cardiotoxicity in mice. Mice were divided into four groups: (i) the control, (ii) DOX groups were fed a control diet (AIN‐93G), (iii) the sSE, and (iv) DOX + sSE groups were fed a 10% sSE diet (AIN‐93G + 10% sSE). After a 4‐week pretreatment of sSE, DOX or saline was administered to the corresponding groups by intraperitoneal injection. The groups fed the 10% sSE diet consumed significantly more food than the groups fed the control diet before the DOX injection. No mortality was observed in the DOX + sSE group, whereas 40% (2 of 5) mortality was observed in the DOX group. Compared with the DOX group, levels of ascites and plasma cardiac troponin I improved in the DOX + sSE group. Significantly lesser DOX‐induced collagen accumulation was observed in the left heart ventricle of the DOX group than in that of the DOX + sSE group. These results suggest that the dietary ghrelin contained in sSE mimics synthetic ghrelin in cardioprotective effect. Ghrelin in sSE (45 pmol/g) and the food intake‐stimulating effect of sSE may explain, at least in part, the protective effect of orally administered teleost ghrelin.  相似文献   

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