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Angiotensin I-Converting Enzyme Inhibitors from Peptic Hydrolyzate of Cottonseed Proteins. 棉籽蛋白消化性水解产物中的血管紧张素i转换酶抑制剂。
Pub Date : 1997-08-25 DOI: 10.3136/FSTI9596T9798.3.257
H. Ashida, K. Koida, K. Kanazawa, G. Danno
The inhibitory peptides of angiotensin I-converting enzyme have been identified from cottonseed proteins. The inhibitory peptides in the pepsin hydrolyzate of cottonseed globulin were purified by successive chromatographies on CM-Sephadex C-50, Sephadex LH-20, and reversed phase high performance liquid chromatography using a C18 column. The amino acid sequences of inhibitory peptides were Tyr-Arg-Lys-Ile-Arg-Ser-Gln-Leu and Trp-Gln-His-Gln-Ser-Arg-Gly-Arg-Phe. The IC50 value of the former peptide was 3.8 μM and the latter was 27 μM.
从棉籽蛋白中鉴定出了血管紧张素i转化酶的抑制肽。采用CM-Sephadex C-50、Sephadex LH-20和C18反相高效液相色谱法对棉籽球蛋白胃蛋白酶水解产物中的抑制肽进行了纯化。抑制肽的氨基酸序列为Tyr-Arg-Lys-Ile-Arg-Ser-Gln-Leu和Trp-Gln-His-Gln-Ser-Arg-Gly-Arg-Phe。前者的IC50值为3.8 μM,后者为27 μM。
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引用次数: 3
Central Mechanisms of Learned Preference for a Deficient Essential Nutrient, L-Lysine, and Recognition of Its Quantitative Intake in Rats. 大鼠对缺乏必需营养素l -赖氨酸的习得性偏好的中心机制及其定量摄入的识别。
Pub Date : 1997-08-25 DOI: 10.3136/FSTI9596T9798.3.217
K. Torii
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引用次数: 0
Simultaneous Determination of Glutathione, .GAMMA.-Glutamylcysteine and Cysteine in Commercial Yeast Extract by HPLC with Fluorimetric Detection. 同时测定谷胱甘肽,γ。HPLC -荧光法测定商品酵母提取物中的谷氨酰半胱氨酸和半胱氨酸。
Pub Date : 1997-08-25 DOI: 10.3136/FSTI9596T9798.3.239
M. Kuroda, H. Nagaba, T. Tsubuku, H. Kawajiri, Y. Ueda
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引用次数: 6
Prediction of time-temperature profiles of atlantic salmon (Salmo salar) during chilled transport using the MAILPROF computer program 利用MAILPROF软件预测大西洋大马哈鱼(Salmo salar)在冷藏运输过程中的时间-温度分布
Pub Date : 1997-08-25 DOI: 10.3136/FSTI9596T9798.3.245
C. Alasalvar, P. Nesvadba, Man Liu, P. Quantick, A. Allen
The MAILPROF computer program for constant ambient temperatures (C-Model) was generalized to accept varying ambient temperatures (V-Model) by implementing the solution of the appropriate differential equation. The time-temperature profiles of gutted salmon with frozen gel pads or flake ice (3:1 ratio by mass) inside a thermally insulated (expanded polystyrene) box at varying ambient temperatures were predicted and compared with the measured temperatures. The predicted fish temperatures (V-Model) correlated well with the measured fish temperatures when fish and frozen gel pads were used and no significant differences (p>0.05) were observed between the two. The V-Model can be used to predict the quantity of cooling gel or ice needed to keep the fish below 8°C in transport at constant and varying ambient temperatures. The time-temperature profiles of smoked salmon packaged with cooling gel were measured in mail transit by miniature data loggers and also predicted by the C and V-Models. No significant differences (p>0.05) were found between the measured and predicted (V-Model) fish temperatures.
通过求解相应的微分方程,将环境温度恒定(c型)的MAILPROF计算机程序推广到环境温度变化(v型)。在不同的环境温度下,用冷冻凝胶垫或片状冰(质量比为3:1)将鲑鱼内脏放入隔热(膨胀聚苯乙烯)盒中进行预测,并与测量温度进行比较。使用冷冻凝胶垫和冷冻凝胶垫时,鱼体温度预测值(v模型)与实测鱼体温度相关性较好,两者之间无显著差异(p>0.05)。v型模型可以用来预测在恒定和变化的环境温度下将鱼保持在8°C以下所需的冷却凝胶或冰的数量。用微型数据记录仪测量了用冷却凝胶包装的烟熏鲑鱼在邮递过程中的时间-温度曲线,并用C模型和v模型进行了预测。实测鱼温与预测鱼温之间无显著差异(p>0.05)。
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引用次数: 0
Effects of Amino Acids and Dipeptides on the Uptake and Transport of Iron by Caco-2 Cells Cultured in Serum-Free Medium 氨基酸和二肽对无血清培养基培养Caco-2细胞铁吸收和转运的影响
Pub Date : 1997-08-25 DOI: 10.3136/FSTI9596T9798.3.279
Ratchanee Kongkachuichai, K. Yasumoto
This study was conducted to investigate the effect of five amino acids, aspartic acid, glutamic acid, histidine, cysteine and phenylalanine, and of two dipeptides, anserine and carnosine, on the uptake and transport of iron across monolayers of Caco-2 cells. Caco-2 cells were grown on polycarbonate membrane inserts in serum-free medium [DMEM plus ITS (5 mg/l insulin, 5 mg/l transferrin and 5 μg/l selenious acid)]. The anserine, carnosine, glutamic acid, histidine and aspartic acid, except for cysteine and phenylalanine, at 20 μM significantly increased the uptake and transport of iron. Iron uptake and rate of iron transport in the presence of aspartic acid at 20 μM were significantly greater than those of other test solutions. When the concentration of added carnosine, anserine, glutamic acid, histidine and phenylalanine was increased from 20 μM to 1 mM in the test solution, the uptake and transport of iron was further increased. The results of the present study indicated that aspartic acid, glutamic acid, histidine, and the dipeptides, anserine and carnosine, enhanced the uptake and transport of iron by Caco-2 cells.
本研究探讨了5种氨基酸(天冬氨酸、谷氨酸、组氨酸、半胱氨酸和苯丙氨酸)和2种二肽(鹅氨酸和肌肽)对Caco-2细胞单层铁的摄取和运输的影响。ccao -2细胞在无血清培养基[DMEM + ITS (5 mg/l胰岛素、5 mg/l转铁蛋白和5 μg/l亚硒酸)]中聚碳酸酯膜插入物上生长。20 μM时,除半胱氨酸和苯丙氨酸外,鹅氨酸、肌氨酸、谷氨酸、组氨酸和天冬氨酸均显著增加铁的吸收和转运。在20 μM条件下,天冬氨酸对铁的吸收和铁的运输速率显著高于其他测试溶液。当试验溶液中肌肽、鹅氨酸、谷氨酸、组氨酸和苯丙氨酸的添加浓度从20 μM增加到1 mM时,铁的吸收和转运进一步增加。本研究结果表明,天冬氨酸、谷氨酸、组氨酸以及二肽、鹿茸氨酸和肌肽增强了Caco-2细胞对铁的摄取和运输。
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引用次数: 1
Enzyme activity of lysozyme-dextran complex prepared by high pressure treatment 高压处理溶菌酶-葡聚糖复合物的酶活性研究
Pub Date : 1997-08-25 DOI: 10.3136/FSTI9596T9798.3.235
Kenji Nakamura, N. Furukawa, A. Matsuoka, Tsuyoshi Takahashi, Y. Yamanaka
The relative activity of lysozyme by high pressure treatment over the pressure range of 50-300 MPa for 10 min at 0, 35 and 60°C was investigated. The activity gradually decreased by treatment at more than 200 MPa at 60°C, though stable at 0 or 35°C. To obtain a lysozyme with high activity, the lysozyme-dextran complex was prepared from a premixed solution of lysozyme and dextran, which was exposed to high pressure. The lysozyme-dextran complex showing the highest activity was prepared by the high pressure condition of 150 MPa for 60 min at 60°C in the weight ratio of 1:5 (lysozyme:dextran). It was concluded that the enhancement of the lysozyme activity of the lysozyme-dextran complex was due to the combination of lysozyme and dextran that was a hydrophilic polysaccharide.
研究了在0、35和60℃条件下,在50 ~ 300 MPa压力范围内处理10 min后溶菌酶的相对活性。在60℃下,当温度超过200 MPa时,活性逐渐下降,但在0℃或35℃时活性稳定。为获得高活性的溶菌酶,将溶菌酶与葡聚糖预混合溶液置于高压下制备了溶菌酶-葡聚糖复合物。在150 MPa高压条件下,以1:5的质量比(溶菌酶:葡聚糖)在60°C条件下反应60 min,制备出活性最高的溶菌酶-葡聚糖复合物。综上所述,溶菌酶-葡聚糖复合物的溶菌酶活性增强是由于溶菌酶与葡聚糖的结合,葡聚糖是一种亲水性多糖。
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引用次数: 11
Infrared Drying Characteristics of Wet Porous Materials 湿性多孔材料的红外干燥特性
Pub Date : 1997-08-25 DOI: 10.3136/FSTI9596T9798.3.294
A. Hashimoto, T. Kameoka, Masayasu Nitta
Our attention was focused on the factors influencing the drying characteristics of wet porous materials in consideration of the sample structure and the radiative heat source. By selecting three kinds of membrane filters, we examined the effects of the mean pore diameter, the irradiation power and its spectral distribution as variables using a far-infrared (FIR) heater and a near-infrared (NIR) heater. As a result, the drying characteristics were influenced by the mean pore diameter, and the FIR drying rate was faster than the NIR drying rate. In addition, we examined the relationship between the drying characteristics and the apparent optical properties of the drying sample. Consequently the results suggested that the diffuse reflectance of the membrane filter obtained in the present experiments was applicable to analyze the infrared drying characteristics. Moreover, we deliberated that it was possible to simulate the infrared drying characteristics by understanding the optical properties.
在考虑样品结构和辐射热源的情况下,重点研究影响湿多孔材料干燥特性的因素。选择三种膜过滤器,采用远红外(FIR)加热器和近红外(NIR)加热器考察了平均孔径、辐照功率及其光谱分布对膜过滤器性能的影响。结果表明,干燥特性受平均孔径的影响,FIR干燥速率快于NIR干燥速率。此外,我们还研究了干燥特性与干燥样品表观光学特性之间的关系。实验结果表明,薄膜滤光片的漫反射系数可用于红外干燥特性的分析。此外,我们认为通过了解其光学性质可以模拟其红外干燥特性。
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引用次数: 5
Changes in Color Parameters during Fermentation and Storage of Red Wine Using Thai Roselle under Different pHs and SO2 Concentrations 不同ph值和SO2浓度下泰国玫瑰酒发酵和贮藏过程中颜色参数的变化
Pub Date : 1997-05-25 DOI: 10.3136/FSTI9596T9798.3.105
K. Yokotsuka, M. Yajima, T. Seki, M. Matthews
A red wine was made from must consisting of dried roselle calyces, water, yeast extract, sugar, and NH4H2PO4. The pHs of wine samples were adjusted to various values within the range 2.5 to 4.0, or SO2 was added prior to yeast addition to give concentrations ranging from 0 to 250 mg/l, and the wines were stored at 25°C. After storage for 35 months, the pH of each wine was regularized, and the wines were then analyzed to determine their general composition and various red color parameters. There was little difference in general composition among the wines stored under different pHs and containing various concentrations of SO2. There were, however, appreciable differences in color density, color hue, and polymeric pigment color, but little difference in the wine color measured at wine pH and at pH 0.25, among the wines stored under different pHs. On the other hand, there were noticeable differences in all the above color parameters, except for color hue, among the wines stored under various SO2 concentrations. Wine color and anthocyanin color were more stable in wines stored at lower pHs or at lower concentrations of SO2, whereas the degree of contribution of polymeric pigment to wine color (at pH<0.5) increased with increasing storage pH and was lowest in the wines to which 100 or 150 mg SO2/l was added. Sensory analysis indicated that the addition of SO2 at 100 mg/l when bottling imparted the best overall quality to the roselle wines stored under the various conditions tested.
一种红葡萄酒是由干枯的玫瑰花萼、水、酵母提取物、糖和NH4H2PO4组成的。将葡萄酒样品的ph值调整到2.5 ~ 4.0的范围内,或者在加入酵母之前加入SO2,使其浓度在0 ~ 250mg /l之间,并在25℃下保存。贮藏35个月后,对每瓶葡萄酒的pH值进行规范化,然后对葡萄酒进行分析,以确定其一般成分和各种红色参数。在不同ph值和不同SO2浓度下贮藏的葡萄酒,其总体成分差异不大。然而,在不同pH值下储存的葡萄酒在颜色密度、颜色色调和聚合色素颜色方面存在明显差异,但在葡萄酒pH值和pH值为0.25时测量的葡萄酒颜色差异不大。另一方面,在不同SO2浓度下储存的葡萄酒中,除颜色色调外,上述所有颜色参数都存在显著差异。在较低pH值或较低SO2浓度下,葡萄酒颜色和花青素颜色更稳定,而聚合物色素对葡萄酒颜色的贡献程度(pH<0.5)随着储存pH的增加而增加,在添加100或150 mg SO2/l的葡萄酒中最低。感官分析表明,装瓶时添加100 mg/l的SO2,在不同的测试条件下,可以使玫瑰色葡萄酒的整体品质达到最佳。
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引用次数: 6
An Inverse Numerical Analysis to Predict the Temperature History during Freezing of Foods 预测食品冷冻过程温度历史的逆数值分析
Pub Date : 1997-05-25 DOI: 10.3136/FSTI9596T9798.3.110
Y. Hu, Hisahiko Watanabe, Tomowo Mihori
Most of the published methods to predict temperature history during food freezing require knowledge of the thermal properties of foods. However, it is difficult to estimate the precise thermal properties of food which show a significant change during freezing. In this paper, an inverse numerical procedure was developed using the modified Marquardt iterative method; a procedure which collects time/temperature data during the early stages of cooling, analyzes these data to determine the thermal property coefficient ratio associated with the heat conduction equation and predicts the time/temperature profile during the remainder of the freezing phase using the system parameters. A numerical experiment using the literature data of lean beef validated that this procedure was able to predict the temperature history even when the measured temperature included a random error of ±0.2°C.
大多数已发表的预测食品冷冻过程中温度历史的方法都需要了解食品的热特性。然而,由于食品在冷冻过程中表现出明显的变化,因此很难准确地估计其热特性。本文采用改进的Marquardt迭代法建立了一种反数值计算方法;在冷却的早期阶段收集时间/温度数据,分析这些数据以确定与热传导方程相关的热性能系数比,并使用系统参数预测剩余冻结阶段的时间/温度分布。利用瘦牛肉文献数据进行的数值实验证明,即使测量温度包含±0.2°C的随机误差,该程序也能够预测温度历史。
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引用次数: 2
Diffusion-Controlled Change in Bubbles Impregnated in Viscous Solutions. 浸渍在粘性溶液中的气泡的扩散控制变化。
Pub Date : 1997-05-25 DOI: 10.3136/FSTI9596T9798.3.101
Kuniko Sugiyama, T. Yano
The applicabilities of Epstein and Plesset's theory and Lemlich's theory to the change in bubble-size distribution under a constant temperature were studied on bubbles impregnated in homogeneous viscous solutions. The numerical calculation based on Epstein and Plesset's theory that took into account the change in the dissolved air concentration in the surrounding solution agreed well with the measured results, while Epstein and Plesset's theory, which assumed the dissolved air concentration in the surrounding solution to be constant, and Lemlich's theory, did not fit the measured results.
研究了Epstein和Plesset理论和lemich理论在均匀粘性溶液中浸渍气泡的恒定温度下气泡尺寸分布变化的适用性。Epstein和Plesset的理论考虑了周围溶液中溶解空气浓度的变化,数值计算结果与实测结果吻合较好,而Epstein和Plesset假设周围溶液中溶解空气浓度恒定的理论和lemich的理论与实测结果不吻合。
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引用次数: 1
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Food Science and Technology International, Tokyo
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