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超高压处理对鲜榨橙汁中主要香气成分的影响 被引量:35
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作者 潘见 王海翔 +2 位作者 谢慧明 杨毅 曾庆梅 《农业工程学报》 EI CAS CSCD 北大核心 2009年第5期239-243,共5页
为了了解超高压处理对鲜橙汁香气的影响,分析超高压处理后橙汁香气变化的原因。采用固相微萃取(Solid Phase Microextraction,SPME)方法对不同压力(100~500MPa)超高压处理的鲜榨橙汁中的香气成分进行富集,并经气相色谱-质谱联用仪(Gas ... 为了了解超高压处理对鲜橙汁香气的影响,分析超高压处理后橙汁香气变化的原因。采用固相微萃取(Solid Phase Microextraction,SPME)方法对不同压力(100~500MPa)超高压处理的鲜榨橙汁中的香气成分进行富集,并经气相色谱-质谱联用仪(Gas Chromatography-Mass Spectrometry,GC-MS)检测分析,橙汁中的主要香气成分有:3种烯(柠檬烯、月桂烯、α-蒎烯);2种醇(芳樟醇、α-松油醇);3种醛(柠檬醛、辛醛、癸醛);1种酮(香芹酮);2种酯(丁酸乙酯、3-OH-己酸乙酯),它们是构成橙汁的主要特征致香成分。通过定量检测分析发现:超高压处理对橙汁中的柠檬烯成分影响很显著,经500MPa的压力处理15min后其含量下降了75%,而月桂烯和α-蒎烯受高压影响较小;α-松油醇、香芹酮含量经高压处理后迅速增加;醛类特征香气成分基本不受高压影响;酯类成分在高压下会发生变化,但总体变化不显著。超高压处理橙汁使其中柠檬烯在高压下发生水合、氧化反应分别生成α-松油醇和香芹酮。超高压处理橙汁一般压力要大于300MPa,而该文研究发现500MPa处理会造成较多的香气损失,故橙汁超高压处理时的压力最好选择400MPa左右。 展开更多
关键词 高压效应 果汁 香气成分 食品加工
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磁固相萃取-气相色谱-火焰光度检测联用测定果汁中的有机磷农药 被引量:32
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作者 黄倩 何蔓 +1 位作者 陈贝贝 胡斌 《色谱》 CAS CSCD 北大核心 2014年第10期1131-1137,共7页
制备了苯乙烯(St)和甲基丙烯酸(MAA)共聚物改性的磁性微球 Fe3O4@P(St-co-MAA),并将其作为磁固相萃取吸附剂,建立了磁固相萃取(MSPE)-气相色谱(GC)-火焰光度检测(FPD)联用分析有机磷农药(OPPs)残留的新方法。以5种有机... 制备了苯乙烯(St)和甲基丙烯酸(MAA)共聚物改性的磁性微球 Fe3O4@P(St-co-MAA),并将其作为磁固相萃取吸附剂,建立了磁固相萃取(MSPE)-气相色谱(GC)-火焰光度检测(FPD)联用分析有机磷农药(OPPs)残留的新方法。以5种有机磷农药(二嗪农、甲基毒死蜱、杀螟硫磷、毒死蜱和喹硫磷)为目标分析物,考察并优化了吸附和解吸条件,确定了最佳实验条件。在最优的实验条件下,方法对5种 OPPs 的检出限( S/N=3)为0.013~0.305μg/L,方法的相对标准偏差( RSD,n=7)为3.1%~8.8%,富集倍数为406~951,线性范围达3个数量级。将该方法应用于新鲜番茄汁、草莓汁样品中的 OPPs 残留分析,加标回收率为85.4%~118.9%。该方法具有检出限低、分析速度快、富集倍数高等优点,为有机磷农药的残留分析提供了新的技术平台。 展开更多
关键词 磁固相萃取 气相色谱-火焰光度检测 有机磷农药 果汁
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茶多酚对新鲜原果汁保鲜效果的影响 被引量:14
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作者 钟艳梅 李耀斌 《现代食品科技》 EI CAS 2011年第6期630-633,共4页
将茶多酚添加到苹果汁、橙子汁和雪梨汁这三种常见果汁中,与山梨酸钾、苯甲酸钠比较研究其对新鲜原果汁的保鲜效果。结果表明,100mg/kg的荼多酚与500mg/kg的山梨酸钾防腐效果相当,对酵母菌、大肠杆菌和金黄色葡萄球菌均有明显抑制... 将茶多酚添加到苹果汁、橙子汁和雪梨汁这三种常见果汁中,与山梨酸钾、苯甲酸钠比较研究其对新鲜原果汁的保鲜效果。结果表明,100mg/kg的荼多酚与500mg/kg的山梨酸钾防腐效果相当,对酵母菌、大肠杆菌和金黄色葡萄球菌均有明显抑制作用,能有效保持果汁原有风味并延长保鲜期7~10d。三种果汁中,茶多酚对苹果汁的保鲜效果最好,其次是橙子汁,对雪梨汁的保鲜效果则不明显。 展开更多
关键词 茶多酚 果汁 保鲜
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Role of pomegranate and citrus fruit juices in colon cancer prevention 被引量:6
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作者 Saravana Kumar Jaganathan Muthu Vignesh Vellayappan +1 位作者 Gayathri Narasimhan Eko Supriyanto 《World Journal of Gastroenterology》 SCIE CAS 2014年第16期4618-4625,共8页
Colorectal cancer is the second leading cause of cancer-related deaths in the United States.Recent studies prove that though chemotherapeutic agents are being used for the treatment of colon cancer,they become non-eff... Colorectal cancer is the second leading cause of cancer-related deaths in the United States.Recent studies prove that though chemotherapeutic agents are being used for the treatment of colon cancer,they become non-effective when the cancer progresses to an invasive stage.Since consumption of certain dietary agents has been linked with various cancers,fruit juices have been investigated for their consistently protective effect against colon cancer.The unique biochemical composition of fruit juices is responsible for their anticancer properties.In this review,the chemo-preventive effect of fruit juices such as pomegranate and citrus juices against colon cancer are discussed.For this purpose,the bioavailability,in vitro and in vivo effects of these fruit juices on colorectal cancer are highlighted.Moreover,there is a scarcity of studies involving human trials to estimate the preventive nature of these juices against colon cancer.This review will support the need for more preclinical tests with these crude juices and their constituents in different colorectal cancer cell lines and also some epidemiological studies in order to have a better understanding and promote pomegranate and citrus juices as crusaders against colon cancer. 展开更多
关键词 Colon cancer Fruit juices POMEGRANATE Citrus fruits CHEMOPREVENTION
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Health effects of fruit juices and beverages with varying degrees of processing
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作者 Xinyue Zhang Xiaojun Liao +2 位作者 Yongtao Wang Lei Rao Liang Zhao 《Food Science and Human Wellness》 SCIE CAS CSCD 2024年第5期2456-2479,共24页
The degree of processing is rarely considered an independent factor in the health effects of fruit juices and beverages(FJBs)consumption.In fact,the consumption of ultra-processed foods has been shown to pose health r... The degree of processing is rarely considered an independent factor in the health effects of fruit juices and beverages(FJBs)consumption.In fact,the consumption of ultra-processed foods has been shown to pose health risks.In this study,we first integrated 4 systems used to classify the degree of food processing and then classified FJBs into three major categories,low(minimal),moderate and high.Second,we compared the differences in attitudes towards FJBs in dietary guidelines.Third,we integrated the results of existing epidemiological surveys,randomized controlled trials,and animal experiments to explore the health risks associated with consuming FJBs.Deepening the processing of FJBs has been found to lead to an increased risk of diseases.Dietary pattern,nutrients,addition agents and consumer preferences may be influential factors.Finally,we investigated whether there were any changes in the health benefits of 100%fruit juices produced by different processing methods.In conclusion,minimally/moderately processed 100%fruit juices provide more health benefits than highly processed fruit beverages.The results support the need to consider the extent of FJBs processing in future studies to adjust official nutritional recommendations for beverage consumption. 展开更多
关键词 Fruit juices and beverages Dietary guidelines Degree of processing Health effects MECHANISM
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果蔬汁的超过滤截留特性 被引量:4
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作者 王黎霓 高以烜 《北京轻工业学院学报》 1990年第1期51-55,共5页
本文介绍了用醋酸纤维素(CA)、聚砜(PS)和聚氯乙烯(PVC)超过滤膜对黄瓜、蕃茄、梨、杏、橙、枣汁进行超过滤处理,考查了各种膜对Vc、总糖、总酸等的截留特性。试验表明,膜的截留特性与果蔬汁品种和膜自身的特性相关,果汁的处理效果一般... 本文介绍了用醋酸纤维素(CA)、聚砜(PS)和聚氯乙烯(PVC)超过滤膜对黄瓜、蕃茄、梨、杏、橙、枣汁进行超过滤处理,考查了各种膜对Vc、总糖、总酸等的截留特性。试验表明,膜的截留特性与果蔬汁品种和膜自身的特性相关,果汁的处理效果一般优于菜汁。超过滤技术为果汁和蔬菜汁的制备提供了有效的方法。 展开更多
关键词 果蔬汁 超滤 截留特性
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Effects of lemon-tomato juice consumption on crystal formation in the urine of patients with calcium oxalate stones:A randomized crossover clinical trial
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作者 Sathish K.Gopala Jim Joe Jithesh Chandran 《Current Urology》 2023年第1期25-29,共5页
Background:Dietary supplementation with citrate-containing juices may serve as an effective alternative to potassium citrate therapy for preventing calcium oxalate stone recurrence.This study was performed to evaluate... Background:Dietary supplementation with citrate-containing juices may serve as an effective alternative to potassium citrate therapy for preventing calcium oxalate stone recurrence.This study was performed to evaluate whether consumption of lemon-tomato juice can decrease the tendency for stone formation in the urine of calcium oxalate stone formers.Materials and methods:The study was conducted as a prospective interventional randomized crossover clinical trial with a repeated-measures design.Twenty-two patients with calcium oxalate stones and no metabolic abnormalities in the urine treated with lithotripsy at a tertiary care center from August 2017 to July 2018 were recruited.After a 14-hour overnight fasting,urine samples were collected after the patients consumed either milk only or milk and lemon-tomato juice.Their urine was tested for multiple parameters,including urine pH,specific gravity,calcium-creatinine ratio,and supersaturation with sodium oxalate,followed by optical density measurement via spectrophotometry.Results:There were no significant differences in the background characteristics between the 2 groups.The optical density of the urine samples obtained after consumption of milk only was significantly higher than that after consumption of milk and lemon-tomato juice(mean=0.131 for milk only vs.0.053 for milk and lemon-tomato juice,p<0.001).The urine calcium-creatinine ratio was similar between the groups(mean=0.141 for milk only vs.0.076 for milk and lemon-tomato juice,p=0.019).Conclusions:The addition of lemon-tomato juice as a source of citrate in the diet significantly decreases the established risk factors for calcium oxalate stone formation in patients.This study was prospectively registered at CTRI under number CTRI/2017/04/008312 on April 7,2017. 展开更多
关键词 Calcium oxalate Dietary supplements Fruit and vegetable juices Kidney calculi UROLITHIASIS
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液液萃取饮料中甲苯GC/MS测定方法的研究
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作者 武宇红 孟哲 +2 位作者 廖询 廖一平 刘虎威 《河北农业大学学报》 CAS CSCD 北大核心 2006年第5期57-59,共3页
为建立一种饮料中甲苯精确定性和定量的分析方法,以标准加入法,在EI源下用GC/MS/SIM模式定量分析果汁饮料中甲苯的含量。结果表明,仪器检出限为0.33 pg,样品中甲苯的平均相对标准偏差小于6%,平均回收率为94.2%。利用GC/MS/SIM方法测定... 为建立一种饮料中甲苯精确定性和定量的分析方法,以标准加入法,在EI源下用GC/MS/SIM模式定量分析果汁饮料中甲苯的含量。结果表明,仪器检出限为0.33 pg,样品中甲苯的平均相对标准偏差小于6%,平均回收率为94.2%。利用GC/MS/SIM方法测定果汁饮料中微量的甲苯,具有灵敏、快速、简便等优点,可用于食品安全检测的推广。 展开更多
关键词 甲苯 饮料 气相色谱-质谱(GC—MS) 标准加入法
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Chemopreventive effect of apple and berry fruits against colon cancer 被引量:3
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作者 Saravana Kumar Jaganathan Muthu Vignesh Vellayappan +6 位作者 Gayathri Narasimhan Eko Supriyanto Dyah Ekashanti Octorina Dewi Aqilah Leela T Narayanan Arunpandian Balaji Aruna Priyadarshini Subramanian Mustafa Yusof 《World Journal of Gastroenterology》 SCIE CAS 2014年第45期17029-17036,共8页
Colon cancer arises due to the conversion of precancerous polyps(benign)found in the inner lining of the colon.Prevention is better than cure,and this is very true with respect to colon cancer.Various epidemiologic st... Colon cancer arises due to the conversion of precancerous polyps(benign)found in the inner lining of the colon.Prevention is better than cure,and this is very true with respect to colon cancer.Various epidemiologic studies have linked colorectal cancer with food intake.Apple and berry juices are widely consumed among various ethnicities because of their nutritious values.In this review article,chemopreventive effects of these fruit juices against colon cancer are discussed.Studies dealing with bioavailability,in vitro and in vivo effects of apple and berry juices are emphasized in this article.A thorough literature survey indicated that various phenolic phytochemicals present in these fruit juices have the innate potential to inhibit colon cancer cell lines.This review proposes the need for more preclinical evidence for the effects of fruit juices against different colon cancer cells,and also strives to facilitate clinical studies using these juices in humans in large trials.The conclusion of the review is that these apple and berry juices will be possible candidates in the campaign against colon cancer. 展开更多
关键词 APPLE BERRY CHEMOPREVENTION Colon cancer Fruit juices PHYTOCHEMICALS
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Antiulcer Activities of Commiphora molmol (Myrrh) Extract in Male Rats
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作者 Nehal A. A. Alfky Reham A. Mustafa +2 位作者 Eslam A. Header Naser A. El Sawy Abdullah G. Al-Kushi 《Open Journal of Gastroenterology》 2016年第10期300-309,共10页
Medicinal plants used in folk medicine contain a wide range of substances that can prevent and treat many diseases. The Antiulcer Activities effects of myrrh or Commiphora molmol extract (CME) were assessed in rats. I... Medicinal plants used in folk medicine contain a wide range of substances that can prevent and treat many diseases. The Antiulcer Activities effects of myrrh or Commiphora molmol extract (CME) were assessed in rats. In this experiment, thirty rats were divided into 6 groups as follows: G1) normal control (vehicle);G2) received aspirin without any treatment;G3) pretreated with Omeprazole (antiulcer drug) and groups (4), (5) and (6) were pretreated with CME at 125, 250 and 500 mg/kg b.wt, respective-ly for 2 weeks. At the end of experiment the volume, pH and total acidity of gastric juices;mucus content and ulcer lengths were measured and protection percentages were calculated. Gross and histopathological examinations of stomachs were also performed. CME induced an antiulcer effect manifested by decreased volume and total acidity of gastric juice and increased mucus content and percentages of protec-tion from ulcer as well as partial amelioration of gross and histopathological lesions seen in stomach of ulcerated rats. In conclusion, the results denote that Commiphora molmol extract possess antiulcer effects in rats. These results affirm the traditional use of Myrrh extract for the treatment of gastric ulcer. 展开更多
关键词 Commiphora molmol Myrrh Extract ANTIULCER Gastric juices OMEPRAZOLE
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Antimicrobial Properties and Phytochemical Composition of <i>Garcinia kola, Bryophyllum pinnatum</i>, and <i>Allium sativum</i>Juices on Some Clinical Pathogens
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作者 Smart Enoch Amala Simeon Nicholas Nweke +1 位作者 Rhoda Nwalozie Tombari Pius Monsi 《Advances in Bioscience and Biotechnology》 2021年第11期388-406,共19页
<b><span style="font-family:;" "="">Background:</span></b><span style="font-family:;" "=""> Medicinal plants have been in use since the o... <b><span style="font-family:;" "="">Background:</span></b><span style="font-family:;" "=""> Medicinal plants have been in use since the origin of man. Many important chemical substances with biological functions that could be used for treatment and prevention of attack from bacteria, fungi, herbivorous mammals and insects are produced by different plants. Such compounds with useful properties have been recorded in their numbers, about 12,000 accounting for about 10% of total plant species. <b>Aim: </b>The aim of the study was to determine the antimicrobial efficacies of herbal extracts on some clinical pathogens. <b>Methods:</b> The antimicrobial activities of pressed juices of <i>Allium</i> <i>sativum</i> (garlic), <i>Bryophyllum</i> <i>pinnatum</i> and <i>Garcinia</i> <i>kola</i> neats and their <span>dilutions were tested on pathogens such as <i>Escherichia</i> <i>coli</i>, <i>Klebsiella</i> <i>pneumoniae</i>, <i>Proteus</i> <i>mirabilis</i>, <i>Staphylococcus</i> <i>aureus</i> and <i>Candida</i> <i>albicans</i> to determine their susceptibility to the juices and their combinations. Agar well diffusion method was employed on Muller-Hinton agar to determine their </span>antimicrobial susceptibility pattern. The phytochemical analysis of the plants’ juices were also determined. <b>Results:</b> At 100% (neat) the juices of <i>G.</i> <i>kola</i>, <i>B.</i> <i>pinnatum</i> and <i>Garcinia</i> <i>kola</i> showed substantial zones of inhibition against <span>the pathogens with a zone diameter of about 22.0 mm and above. At 75% concentrations, the juices inhibited the pathogens tested against them. <i>A.</i> <i>sativum</i> (gar</span><span>lic) inhibited <i>K.</i> <i>pneumonia</i>, <i>P.</i> <i>mirabilis</i>, and <i>S.</i> <i>aureus</i> even at 50% concentration. <i>C.</i> <i>albicans</i> isolates were 60% susceptible to <i>G.</i> <i>kola</i> juice, 40% at 100% concentration. At 75% concentration of the juice, <i>C.</i> <i>albicans</i> isolates were also 60% susceptible to the juices. At 50% - 100% concentrations, < 展开更多
关键词 Antimicrobial PHYTOCHEMICAL Plant juices PATHOGENS
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搅拌棒吸附萃取-热脱附-气相色谱-质谱联用法测定果汁中29种有机磷农药残留 被引量:2
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作者 冯晓青 王芹 +4 位作者 汪怡 王露 宋鑫 徐瑞 杭学宇 《分析仪器》 CAS 2019年第4期9-16,共8页
建立了果汁中有机磷农药(OPPs)残留的搅拌棒吸附萃取(SBSE)-热脱附(TD)-气相色谱-质谱(GCMS)联用测定方法。对萃取体积、pH值、搅拌速度、搅拌时间、温度及加盐量等对搅拌棒萃取效率有影响的因素进行了研究。在优化的实验条件下,29种有... 建立了果汁中有机磷农药(OPPs)残留的搅拌棒吸附萃取(SBSE)-热脱附(TD)-气相色谱-质谱(GCMS)联用测定方法。对萃取体积、pH值、搅拌速度、搅拌时间、温度及加盐量等对搅拌棒萃取效率有影响的因素进行了研究。在优化的实验条件下,29种有机磷农药在0.05~5.0mg/L质量浓度范围内呈良好线性关系,相关系数(r)>0.9901,29种有机磷农药的检出限(S/N=3)为0.02~1.24μg/L。将该方法应用于新鲜葡萄汁、蓝莓汁样品中的有机磷农药残留分析,加标回收率为5.1%~65.9%,相对标准偏差(RSD,n=6)为3.0%~11.5%。该方法简单,准确,灵敏高和选择性好,可满足果汁样品中痕量有机磷农药的测定要求,为有机磷农药的残留分析提供了新的技术平台。 展开更多
关键词 搅拌棒吸附萃取 热脱附 气相色谱-质谱 有机磷农药 果汁
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褪色光度法测定几种市售橙汁饮料中维生素C含量 被引量:1
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作者 来守军 李艳杰 +4 位作者 高钢 张琳琳 张宇娜 熊维平 左波 《内蒙古农业大学学报(自然科学版)》 CAS 北大核心 2014年第3期119-124,共6页
本文旨在建立一种仪器设备费用不高,操作过程简单,测定准确度较高,能够在大多基础实验室普及的市售橙汁饮料维生素C测定方法。本文先是确定采用高锰酸钾作为显色剂和反应物,建立硫酸、维生素C、高锰酸钾体系褪色光度法测定市售橙汁饮料... 本文旨在建立一种仪器设备费用不高,操作过程简单,测定准确度较高,能够在大多基础实验室普及的市售橙汁饮料维生素C测定方法。本文先是确定采用高锰酸钾作为显色剂和反应物,建立硫酸、维生素C、高锰酸钾体系褪色光度法测定市售橙汁饮料维生素C,然后通过单因素分析确定实验的最佳条件。维生素C浓度在0~16μg/ml范围内与溶液的褪色程度(△A)服从朗伯·比尔定律,最小检出限为0.00214μg/ml,相对标准偏差为0.81%~0.89%,回收率为94.0%~101.0%。 展开更多
关键词 维生素C 褪色光度法 测定 饮料
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Glycemic Index and Glycemic Load of Juice from Edible Wild Fruits (Adansonia digitata, Tamarindus indica and Parkia biglobosa) Consumed in Cote d’Ivoire
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作者 Antoine Kouame Kouassi Nestor Kouakou Kouassi +3 位作者 Maxwell Avit Grah Beugre Denis Yao N’Dri Georges N’Guessan Amani Dago Gnakri 《Journal of Biosciences and Medicines》 2018年第1期63-74,共12页
The diabetes mellitus is a public health problem in C?te d’Ivoire. The Glycemic index (GI) and the Glycemic load (GL) determination of commonly consumed foods such as juice fruits is an alternative to prevent metabol... The diabetes mellitus is a public health problem in C?te d’Ivoire. The Glycemic index (GI) and the Glycemic load (GL) determination of commonly consumed foods such as juice fruits is an alternative to prevent metabolic diseases. This study carried out three wild fruits locally named Baobab (Adansonia digitata), Tomi (Tamarindus indica) and Néré (Parkia biglobosa) collected at maturity stage. The juices from the pulp of fruits have been elaborated, pasteurized, submitted to microbiological and physicochemical analysis before GIs/GLs determination. Ten healthy subjects with body mass index and age average respectively 21.57 ± 1.06 and 28 ± 2 years old tested the three juices and glucose (50 g) as reference food. Blood samples have been collected at 0, 15, 30, 45, 60, 90 and 120 min after foods consumption. The GIs/GLs has been determined according to ISO/FDI 26642:2010 protocol. Data showed that pasteurized juices has a weak microbiologic load (1.0102 - 2.4102 of Mesophylls Aerobic Germs) and not contain pathogen germs. The GI and GL of Néré juice are high with respective values of 89.54 ± 1.63 and 29.22 ± 4.09 whereas those of Baobab and Tomi juice are moderate with respective GI/GL values of 66.48 ± 2.12/13.24 ± 1.99 and 60.41 ± 2.63/12.87 ± 1.67. The juice of Néré should be consumed occasionally when those of Baobab and Tomi should be consumed with moderation. It would be suitable to know more about the GI and GL of all the juice fruits produced locally so as to prevent efficiently diabetes mellitus in the country. 展开更多
关键词 Edible Wild Fruits Pasteurized juices Glycemic Index Glycemic Load Cote D’Ivoire
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Characterization of Bacterial Cellulose From Oil Palm Shoot Juices and Coconut Juice/Poly(ethylene glycol) Biocomposite
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作者 Nantharat Phruksaphithak Chalermkiet Kaewnun Sompong O-Thong 《Journal of Renewable Materials》 SCIE 2019年第5期493-504,共12页
A new biocomposite was preformed between bacterial cellulose(BC)pellicle and polyethylene glycol(PEG)at different concentrations(0%,5,10%,15%and 20%)and different molecular weight(600,1000 and 2000).The structure and ... A new biocomposite was preformed between bacterial cellulose(BC)pellicle and polyethylene glycol(PEG)at different concentrations(0%,5,10%,15%and 20%)and different molecular weight(600,1000 and 2000).The structure and mechanical properties of BC/PEG biocomposite were investigated.The results indicated that the properties of the BC were improved by the addition of PEG.The morphology of the BC and BC/PEG blend was examined by a scanning electron microscope(SEM).These showed that PEG was coated with a large pore size fibril on the BC and the BC/PEG was dense with an even and smooth surface.All the Fourier transform infrared spectroscopy(FT-IR)thermograms of BC/PEG showed the same functional groups as typical BC and PEG.The DSC result showed that the thermal stability improved which might be associated with a weak interaction between BC and PEG,and may be useful for applications. 展开更多
关键词 Bacterial cellulose poly(ethylene glycol) oil palm shoot juices
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Free Radical-Scavenging Properties and Antioxidant Activity of Fractions from Cranberry Products
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作者 Stéphane Caillet Guillaume Lorenzo +2 位作者 Jacinthe Coté Jean-Francois Sylvain Monique Lacroix 《Food and Nutrition Sciences》 2012年第3期337-347,共11页
Lipid peroxidation inhibition capacity and antiradical activity were evaluated in HPLC fractions of different polarity obtained from two cranberry juices and three extracts isolated from frozen cranberries and pomace ... Lipid peroxidation inhibition capacity and antiradical activity were evaluated in HPLC fractions of different polarity obtained from two cranberry juices and three extracts isolated from frozen cranberries and pomace containing antho-cyanins, water-soluble and apolar phenolic compounds, respectively. Compounds with close polarities were collected to obtain between three and four fractions from each juice or extract. The cranberry phenols are good free radi-cal-scavengers, but they were less efficient at inhibiting the lipid peroxidation. Of all the samples tested, the intermediate polarity fraction of extract rich in apolar phenolic compounds of fruit presented the highest antiradical activity while the most hydrophobic fractions of the anthocyanin-rich extract from fruit and pomace appeared to be the most efficient at inhibiting the lipid peroxidation. The antioxidant or pro-oxidant activity of fractions increased with the con-centration. The phenol polarity and the technological process to manufacture cranberry juice can influence the antioxidant and antiradical activities of fractions. 展开更多
关键词 HPLC Fractions Cranberry juices Phenolic Extracts Free Radical Scavenging Capacity Antioxidant Activity
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液相色谱-串联质谱法快速筛查测定浓缩果蔬汁中的156种农药残留 被引量:52
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作者 李岩 郑锋 +1 位作者 王明林 庞国芳 《色谱》 CAS CSCD 北大核心 2009年第2期127-137,共11页
建立了浓缩果蔬汁中156种农药多残留的液相色谱-电喷雾串联质谱(LC-ESI-MS/MS)测定方法。样品用1%醋酸乙腈溶液萃取,经Waters Sep-Pak Vac固相萃取柱净化,乙腈-甲苯(体积比为3∶1)洗脱,旋转蒸发浓缩,用乙腈-水(体积比为3∶2)溶解,... 建立了浓缩果蔬汁中156种农药多残留的液相色谱-电喷雾串联质谱(LC-ESI-MS/MS)测定方法。样品用1%醋酸乙腈溶液萃取,经Waters Sep-Pak Vac固相萃取柱净化,乙腈-甲苯(体积比为3∶1)洗脱,旋转蒸发浓缩,用乙腈-水(体积比为3∶2)溶解,以Agilent ZORBAX SB-C18色谱柱分离,以电喷雾电离串联质谱在正离子多反应监测(MRM)模式下进行测定。对156种农药在5种浓缩果蔬汁(橙汁、苹果汁、葡萄汁、白菜汁、胡萝卜汁)中两个添加水平下的回收率进行了测定,回收率范围为57.2%~122.7%,相对标准偏差范围为0.9%~19.8%。方法的检出限(S/N=3)和定量限(S/N=10)范围分别为0.10~56.77μg/kg和0.33~189.23μg/kg。该方法样品前处理简单、快速、分析时间短,灵敏度、准确度和精密度均符合农药多残留检测技术的要求,适用于苹果汁、橙汁、葡萄汁、白菜汁、胡萝卜汁等浓缩果蔬汁中156种农药多残留的快速筛查测定。 展开更多
关键词 液相色谱-串联质谱 QuEChERS方法 农药多残留 浓缩果蔬汁
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澄清水蜜桃汁的流变学特性研究 被引量:39
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作者 谢放华 李国龙 《食品科学》 EI CAS CSCD 北大核心 2000年第5期20-23,共4页
 对澄清水蜜桃汁和脱果胶水蜜桃汁的流变学特性进行了研究。实验发现无果胶和悬浮果肉的水蜜桃汁表现为牛顿型流体。实验研究了不同温度对不同浓度水蜜桃汁粘度的影响,最后给出了描述温度和浓度对水蜜桃汁粘度影响的综合性方程。
关键词 果汁 澄清 水蜜桃汁 流变学
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苹果品种用于加工鲜榨汁的适宜性评价 被引量:39
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作者 聂继云 毋永龙 +4 位作者 李海飞 王昆 李静 李志霞 徐国锋 《农业工程学报》 EI CAS CSCD 北大核心 2013年第17期271-278,共8页
为科学评价苹果品种的鲜榨汁加工适宜性,以122个单果质量在100g以上的品种为对象,运用相关分析、因子分析、概率分级、层次分析、K-均值聚类、判别分析等方法建立苹果品种鲜榨汁加工适宜性评价技术。结果表明:果实与鲜榨汁间可滴定酸含... 为科学评价苹果品种的鲜榨汁加工适宜性,以122个单果质量在100g以上的品种为对象,运用相关分析、因子分析、概率分级、层次分析、K-均值聚类、判别分析等方法建立苹果品种鲜榨汁加工适宜性评价技术。结果表明:果实与鲜榨汁间可滴定酸含量、可溶性固形物含量、可溶性糖含量、固酸比和糖酸比5项指标均呈极显著相关,相关系数分别为0.8967、0.9393、0.8413、0.9036和0.9099。果实可溶性固形物含量、固酸比、出汁率、单宁含量等4项指标被确定为苹果品种鲜榨汁加工适宜性评价指标。4项指标均划分为服从或近似服从正态分布的5级,即极低、低、中、高和极高。根据指标权重和指标分级标准,建立了4项指标的评分标准。建立的苹果品种鲜榨汁加工适宜性判别函数有极高的判别准确性,正确判别率达到94.74%(建模样本)和96.55%(检验样本)。筛选出的58个优良品种中,红富士、乔纳金、津轻等43个品种适于加工鲜榨汁,澳洲青苹、红玉、金冠等15个品种极适于加工鲜榨汁。 展开更多
关键词 水果汁 加工 品质调控 苹果 品种 鲜榨汁 适宜性 评价
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树冠及叶凋落物对模拟酸雨缓冲能力的初探 被引量:31
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作者 邓仕坚 陈楚莹 +1 位作者 张家武 汪思龙 《环境科学》 EI CAS CSSCI CSCD 北大核心 1992年第3期10-17,共8页
用模拟试验的方法,对树冠、叶凋落物和鲜树叶缓冲酸雨的能力进行研究。结果表明,阔叶树比针叶树缓冲能力大;树叶汁液pH高的比低的缓冲能力大;阔叶树面积的大小,与缓冲能力成正比;针叶则相反。在pH2.0、3.0的处理中,它们的缓冲能力排序为... 用模拟试验的方法,对树冠、叶凋落物和鲜树叶缓冲酸雨的能力进行研究。结果表明,阔叶树比针叶树缓冲能力大;树叶汁液pH高的比低的缓冲能力大;阔叶树面积的大小,与缓冲能力成正比;针叶则相反。在pH2.0、3.0的处理中,它们的缓冲能力排序为:叶凋落物>鲜树叶>树冠。在pH4.5时,则是叶凋落物>树冠>鲜树叶。 展开更多
关键词 模拟酸雨 叶凋落物 缓冲
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