physiochemical properties

理化性质
  • 文章类型: Journal Article
    细胞信号传导多肽的转化生长因子β(TGF-β)家族的成员由于其从线虫到哺乳动物调节控制胚胎生长并维持组织稳态的基于细胞的活性的能力而引起了极大的兴趣。本研究设计了TGF-β蛋白家族的计算分析,以在分子水平上理解这些蛋白。本研究首次确定了尼罗罗非鱼TGF-β基因家族的基因组结构。我们选择了33个TGF-β基因进行鉴定,并将它们分为两个亚组,TGF-样和BMP-样。此外,尼罗罗非鱼TGF-β蛋白的亚细胞定位表明,除BMP6,BMP7和INHAC外,TGF-β蛋白家族的大多数成员都存在于细胞外基质和血浆中。除BMP1外,所有TGF-β蛋白均是热稳定的。每种蛋白质都表现出碱性,不包括BMP1,BMP2,BMP7,BMP10,GDF2,GDF8,GDF11,AMH,INHA,INHBB,和NODALM。根据不稳定性指数,所有蛋白质都给人不稳定的印象,值超过40,不包括BMP1和BMP2。发现每种TGF-β蛋白是疏水性的,GRAVY值降低。此外,发现的每一个TGF-β基因都有一致的进化模式.TGF-β基因家族有8个片段重复,和Ka/Ks比率表明纯化选择对经历选择压力的重复基因对有影响。这项研究强调了TGF-β的重要功能,并描述了进一步研究以更好地了解转化生长因子β在鱼类和其他物种中的作用和机制的需求。
    The members of the transforming growth factor β (TGF-β) family of cell signaling polypeptides have garnered a great deal of interest due to its capacity from nematodes to mammals to regulate cell-based activities which control the growth of embryos and sustain tissue homeostasis. The current study designed a computational analysis of the TGF-β protein family for understanding these proteins at the molecular level. This study determined the genomic structure of TGF-β gene family in Nile tilapia for the first time. We chose 33 TGF-β genes for identification and divided them into two subgroups, TGF-like and BMP-like. Moreover, the subcellular localization of the Nile tilapia TGF-β proteins have showed that majority of the members of TGF-β proteins family are present into extracellular matrix and plasma except BMP6, BMP7, and INHAC. All TGF-β proteins were thermostable excluding BMP1. Each protein exhibited basic nature, excluding of BMP1, BMP2, BMP7, BMP10, GDF2, GDF8, GDF11, AMH, INHA, INHBB, and NODAL M. All proteins gave impression of being unstable depending on the instability index, having values exceeding 40 excluding BMP1 and BMP2. Each TGF-β protein was found to be hydrophobic with lowered values of GRAVY. Moreover, every single one of the discovered TGF-β genes had a consistent evolutionary pattern. The TGF-β gene family had eight segmental duplications, and the Ka/Ks ratio demonstrated that purifying selection had an impact on the duplicated gene pairs which have experienced selection pressure. This study highlights important functionality of TGF-β and depicts the demand for further investigation to better understand the role and mechanism of transforming growth factor β in fishes and other species.
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  • 文章类型: Journal Article
    由于可用的抗真菌药物的不利副作用,球形马拉色菌通常是浅表真菌病的原因,这给治疗带来了重大挑战。为了减少对宿主的潜在危害并克服这些障碍,必须开发新的治疗药物,选择性地靶向病原体特有的酶。本研究的重点是邻氨基苯甲酸磷酸核糖基转移酶(AnPRT),这对M.globosa的色氨酸生产途径至关重要。要了解更多关于AnPRT酶的功能,我们建模,已验证,并模拟了它的结构。此外,经过植物化学筛选,在植物Albiziaamara的不同提取物中发现了许多生物活性成分。有趣的是,剂量范围为500至2000微克/毫升,氯仿提取物显示出显著的抗真菌活性,抑制区在11.0±0.0和25.6±0.6毫米之间测量。根据分子对接分析,活性提取物中的化合物,特别是2-叔丁基-4-异丙基-5-甲基苯酚,与AnPRT酶的关键残基相互作用,ARG205和PHE214,有效结合能为-4.9kcal/mol。提取物的揭示成分满足药物相似度的要求,并显示出有望作为一种强大的抗真菌剂来抵抗由球形支原体引起的感染。这些发现表明,使用植物来源的化学物质靶向AnPRT酶是创造创新抗真菌治疗的可行途径。
    The fungus Malassezia globosa is often responsible for superficial mycoses posing significant treatment challenges because of the unfavourable side effects of available antifungal drugs. To reduce potential hazards to the host and overcome these hurdles, new therapeutic medicines must be developed that selectively target enzymes unique to the pathogen. This study focuses on the enzyme anthranilate phosphoribosyltransferase (AnPRT), which is vital to M. globosa\'s tryptophan production pathway. To learn more about the function of the AnPRT enzyme, we modeled, validated, and simulated its structure. Moreover, many bioactive components were found in different extracts from the plant Albizia amara after phytochemical screening. Interestingly, at doses ranging from 500 to 2000 µg/ml, the chloroform extract showed significant antifungal activity, with inhibition zones measured between 11.0 ± 0.0 and 25.6 ± 0.6 mm. According to molecular docking analyses, the compounds from the active extract, particularly 2-tert-Butyl-4-isopropyl-5-methylphenol, interacted with the AnPRT enzyme\'s critical residues, ARG 205 and PHE 214, with an effective binding energy of -4.9 kcal/mol. The extract\'s revealed component satisfies the requirements for drug-likeness and shows promise as a strong antifungal agent against infections caused by M. globosa. These findings imply that using plant-derived chemicals to target the AnPRT enzyme is a viable path for the creation of innovative antifungal treatments.
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  • 文章类型: Journal Article
    传统的doenjang与商业doenjang的特征不同,因为前者涉及漫长而自然的发酵过程。这项研究确定了在忠南地区生产的传统Doenjang的理化特性。两种商业产品和13种传统的Doenjang产品在颜色方面进行了表征,水分含量,pH值,°白利糖度,盐度,酸值,可滴定酸度,NH2-N含量,酒精含量,和总糖含量和减少糖含量。传统样品在颜色方面与商业样品明显不同,水分,°白利糖度,酸值,在酒精中,NH2-N含量,和总糖含量(p<0.05),传统样品的特征与先前分析的样品相似。此外,不同城市生产的样品可以根据其理化特征进行聚类。传统样品之间观察到的差异归因于发酵条件,即,持续时间和温度,因为这些差异与成分比例无关。
    Traditional doenjang characteristically differs from commercial doenjang, as the former involves a long and natural fermentation process. This study determined the physiochemical characteristics of traditional doenjang produced in Chungnam region. Two commercial and thirteen traditional doenjang products were characterized in terms of color, moisture content, pH, °Brix, salinity, acid value, titratable acidity, NH2-N content, alcohol content, and total and reducing sugar contents. The traditional samples significantly differed from the commercial samples in terms of color, moisture, °Brix, acid value, and in alcohol, NH2-N content, and total sugar contents (p < 0.05), and the traditional samples were characteristically similar to those previously analyzed. Moreover, the samples produced in different cities could be clustered based on their physiochemical characteristics. The observed differences among the traditional samples were attributed to fermentation conditions, namely, duration and temperature, as these differences were not correlated with ingredient ratio.
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  • 文章类型: Journal Article
    这项研究报告了来自西澳大利亚各个地区的蜂胶样品的物理化学和抗氧化性能,并使用高效薄层色谱(HPTLC)鉴定了一些酚类成分。使用改良的Folin-Ciocalteu测定法测定总酚含量(TPC),和抗氧化活性用铁还原抗氧化能力(FRAP)测定法进行研究,还通过HPTLC-DPPH分析进行可视化和半定量。TPC值范围为9.26至59.3mg没食子酸当量/g原始蜂胶,FRAP测定数据范围为4.34至53.8mmolFe2mmol/kg原始蜂胶,尽管这些变化中的一些可能与使用70%乙醇获得的提取收率的差异有关。木犀草素的存在,taxifolin,柚皮苷,和4-羟基苯乙酸进行了全面的确认,对HPTLC衍生数据库的验证匹配方法。该研究的结果强调了未来研究西澳大利亚蜂胶的化学组成和生物活性的重要性。
    This study reports on the physicochemical and antioxidant properties of propolis samples from various regions across Western Australia and identifies some phenolic constituents using high-performance thin-layer chromatography (HPTLC). Total phenolic content (TPC) was determined using a modified Folin-Ciocalteu assay, and antioxidant activity was investigated with the Ferric Reducing Antioxidant Power (FRAP) assay and also visualised and semi-quantified by HPTLC-DPPH analysis. TPC values ranged from 9.26 to 59.3 mg gallic acid equivalent/g of raw propolis and FRAP assay data from 4.34 to 53.8 mmol Fe2+ mmol/kg of raw propolis, although some of these variations might be related to differences in extraction yields obtained with 70% ethanol. The presence of luteolin, taxifolin, naringenin, and 4-hydroxyphenylacetic acid was confirmed based on a comprehensive, validated matching approach against an HPTLC-derived database. The findings of the study highlight the importance of future research on the chemical composition and bioactivity of Western Australian propolis.
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  • 文章类型: Journal Article
    使用大豆分离蛋白的混合物制备蛋白质混合物,大豆浓缩蛋白,和小麦蛋白质通过高水分挤压。这项研究调查了大豆油/椰子油添加的影响(2%,5%,和8%)对经过高水分挤压的大豆蛋白-小麦蛋白混合物的理化性质。对蛋白质挤出物进行了质构特性评估,纤维度,感官评价,微观结构,蛋白质溶解度,和蛋白质二级结构。研究结果表明,植物油显著降低了硬度,弹性,和挤出物的咀嚼性,和5%植物油显著提高了挤出物的纤维度。此外,5%椰子油的纤维度和感官评价得分最高。对宏观和微观结构的观察表明,大豆油中不饱和脂肪酸的存在不利于高水分挤出加工过程中蛋白质挤出物纤维结构的改善。SDS-PAGE和FTIR结果表明,椰子油,富含饱和脂肪酸,导致了质构蛋白中和低分子量亚基的聚集。此外,椰子油提高了含有硫基氨基酸的11S蛋白质亚基的比例,并促进了从β转角到β折叠的转变。植物油的加入增加了氢和二硫键的发展,导致密度更高,纤维结构。DSC证明植物油降低了组织化蛋白质的热稳定性,但增强了蛋白质结构的顺序。
    A protein mixture was prepared using a blend of soybean protein isolate, soybean protein concentrate, and wheat protein through high-moisture extrusion. This study investigated the effects of soybean oil/coconut oil additions (2%, 5%, and 8%) on the physiochemical properties of a soy protein-wheat protein mixture subjected to high-moisture extrusion. The protein extrudates underwent assessment for textural properties, fiber degree, sensory evaluation, microstructure, protein solubility, and protein secondary structure. The findings indicated that plant oils significantly reduced the hardness, springiness, and chewiness of the extrudates, and 5% plant oil significantly increased the fiber degree of the extrudates. In addition, the highest fiber degree and sensory evaluation score were achieved with 5% coconut oil. Observation of the macro- and microstructure indicated that the presence of unsaturated fatty acids in soybean oil did not benefit the improvement of the fibrous structure of protein extrudates during high-moisture extrusion processing. SDS-PAGE and FTIR results revealed that coconut oil, rich in saturated fatty acids, caused the clustering of medium- and low-molecular-weight subunits in texturized protein. Additionally, coconut oil elevated the ratio of 11S protein subunits containing sulfur-based amino acids and facilitated a shift from β-turn to β-sheet. The inclusion of plant oils increased the development of hydrogen and disulfide bonds, resulting in a denser, fibrous structure. DSC demonstrated that plant oils reduced the thermal stability of the texturized proteins but enhanced the order of protein structure.
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  • 文章类型: Journal Article
    冷等离子体处理是食品加工和保鲜领域的一项创新技术。它主要用于使微生物和酶失活,而无需加热和化学添加剂;因此,它通常被称为“清洁和绿色”技术。然而,在冷等离子体加工过程中,由于等离子体反应性物质和食品成分之间的潜在化学相互作用,可能会出现食品质量和安全方面的挑战。这篇综述旨在巩固和讨论冷等离子体对主要食品的化学成分以及物理和功能特性的影响的数据,包括乳制品,肉,坚果,水果,蔬菜,和谷物。我们强调冷等离子体如何诱导关键食品成分的化学改性,比如水,蛋白质,脂质,碳水化合物,维生素,多酚,和挥发性有机化合物。此外,我们讨论颜色的变化,pH值,冷等离子体处理诱导的感官特性及其与化学修饰的相关性。目前的研究表明,冷等离子体中的活性氧和氮可以氧化蛋白质,脂质,与食物基质直接接触时的生物活性化合物。营养素和生物活性化合物的减少,包括多不饱和脂肪酸,糖,糖多酚,和维生素,在乳制品中观察到,蔬菜,水果,和冷等离子体处理后的饮料。此外,观察到结构变化以及挥发性和非挥发性氧化产物的产生,影响颜色,风味,和食品的质地。然而,对干食物的影响,如种子和坚果,相对不那么明显。总的来说,这篇评论突出了缺点,挑战,以及与食品加工中的冷等离子体处理相关的机会。
    Cold plasma treatment is an innovative technology in the food processing and preservation sectors. It is primarily employed to deactivate microorganisms and enzymes without heat and chemical additives; hence, it is often termed a \"clean and green\" technology. However, food quality and safety challenges may arise during cold plasma processing due to potential chemical interactions between the plasma reactive species and food components. This review aims to consolidate and discuss data on the impact of cold plasma on the chemical constituents and physical and functional properties of major food products, including dairy, meat, nuts, fruits, vegetables, and grains. We emphasize how cold plasma induces chemical modification of key food components, such as water, proteins, lipids, carbohydrates, vitamins, polyphenols, and volatile organic compounds. Additionally, we discuss changes in color, pH, and organoleptic properties induced by cold plasma treatment and their correlation with chemical modification. Current studies demonstrate that reactive oxygen and nitrogen species in cold plasma oxidize proteins, lipids, and bioactive compounds upon direct contact with the food matrix. Reductions in nutrients and bioactive compounds, including polyunsaturated fatty acids, sugars, polyphenols, and vitamins, have been observed in dairy products, vegetables, fruits, and beverages following cold plasma treatment. Furthermore, structural alterations and the generation of volatile and non-volatile oxidation products were observed, impacting the color, flavor, and texture of food products. However, the effects on dry foods, such as seeds and nuts, are comparatively less pronounced. Overall, this review highlights the drawbacks, challenges, and opportunities associated with cold plasma treatment in food processing.
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  • 文章类型: Journal Article
    双歧杆菌是广受好评的益生菌,然而,细菌的脆弱性质使其通过食品递送成为挑战。本研究的目的是通过掺入短双歧杆菌NCIM5671来开发益生菌黑巧克力。益生菌巧克力通过在最后的调温阶段向黑巧克力中添加短芽孢杆菌来制备。评估巧克力在制备时和在90天的储存期间的短双歧杆菌的活力。短小芽孢杆菌的添加对巧克力的生理参数,如颜色的影响,纹理,流变学,熔化剖面,和感官轮廓也被确定。益生菌巧克力发展了保持短小芽孢杆菌活力(9logCFU/g)90天的时间。与对照巧克力相比,益生菌巧克力的生理参数没有观察到显著差异。总体上,发现益生菌黑巧克力是用于递送短双歧杆菌NCIM5671的合适基质。
    在线版本包含补充材料,可在10.1007/s13197-024-05958-6获得。
    Bifidobacteria are widely acclaimed probiotic bacteria, however, the fragile nature of the bacteria has rendered its delivery through food products a challenge. The aim of the present study was to develop probiotic dark chocolate by incorporating Bifidobacterium breve NCIM5671. The probiotic chocolate was prepared by adding B. breve to dark chocolate at the final tempering stage. The chocolate was evaluated for the viability of B. breve upon preparation and during storage period of 90 days. The effect of addition of B. breve on physiological parameters of chocolate such as color, texture, rheology, melting profile, and sensory profile was also determined. The probiotic chocolate developed retained viability of B. breve (9 log CFU/g) for a period of 90 days. No significant differences were observed in physiological parameters of probiotic chocolate compared to control chocolate. Overall the probiotic dark chocolate was found to be a suitable matrix for delivery of B. breve NCIM5671.
    UNASSIGNED: The online version contains supplementary material available at 10.1007/s13197-024-05958-6.
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  • 文章类型: Journal Article
    抗癌肽(ACP)由于其选择性和较低的毒性,最近已成为有前途的癌症治疗剂。然而,实验验证的ACP数量有限,并且从大规模序列数据中识别ACP是耗时且昂贵的。因此,开发和改进用于识别ACP的现有计算模型至关重要。在这项研究中,提出了一种基于肽残基组成和理化性质信息的计算方法ACP_DA。为了减少过度拟合和降低计算成本,使用顺序正向选择方法来构建最佳特征组。随后,将特征向量输入光梯度增强机分类器进行模型构建。通过独立的集合测试观察到,ACP_DA实现了最高的Matthew's相关系数0.63和准确度0.8129,与最先进的方法相比显示出至少2%的增强。令人满意的结果证明了ACP_DA作为识别ACP的有力工具的有效性,有可能为有前途的疗法的开发和优化做出重大贡献。数据和资源代码可在https://github.com/Zlclab/ACP_DA获得。
    Anticancer peptides (ACPs) have recently emerged as promising cancer therapeutics due to their selectivity and lower toxicity. However, the number of experimentally validated ACPs is limited, and identifying ACPs from large-scale sequence data is time-consuming and expensive. Therefore, it is critical to develop and improve upon existing computational models for identifying ACPs. In this study, a computational method named ACP_DA was proposed based on peptide residue composition and physiochemical properties information. To curtail overfitting and reduce computational costs, a sequential forward selection method was utilized to construct the optimal feature groups. Subsequently, the feature vectors were fed into light gradient boosting machine classifier for model construction. It was observed by an independent set test that ACP_DA achieved the highest Matthew\'s correlation coefficient of 0.63 and accuracy of 0.8129, displaying at least a 2% enhancement compared to state-of-the-art methods. The satisfactory results demonstrate the effectiveness of ACP_DA as a powerful tool for identifying ACPs, with the potential to significantly contribute to the development and optimization of promising therapies. The data and resource codes are available at https://github.com/Zlclab/ACP_DA.
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  • 文章类型: Journal Article
    本研究的目的是从原焦煤中获得富氮活性炭。对初始材料进行去矿化过程。在500°C下热解去矿化的前体,然后在800°C下用氢氧化钠活化。在两种不同的温度变体(300和350°C)下,使用氨和空气的混合物对活性炭吸附剂进行氨氧化处理。在去矿质前体的阶段进行氮气引入,热解产物,和氧化活化剂。元素组成,酸碱性质,并确定了所得碳吸附剂的结构参数。研究了活性炭去除二氧化氮的能力。结果表明,氨氧化过程将新的基于氮的官能团结合到活性炭结构中。同时,氨氧化过程改变了表面的酸碱特性,并对所得吸附剂的质地参数产生了负面影响。此外,研究表明,所有获得的碳吸附剂都表现出明显的微孔结构。对NO2进行了吸附测试,结果表明获得的碳吸附剂在去除这种气态污染物方面非常有效。在干燥条件下对NO2的最佳吸附容量为23.5mg/g,在潮湿条件下为75.0mg/g。
    The aim of this study was to obtain nitrogen-enriched activated carbons from orthocoking coal. The initial material was subjected to a demineralisation process. The demineralised precursor was pyrolysed at 500 °C and then activated with sodium hydroxide at 800 °C. Activated carbon adsorbents were subjected to the process of ammoxidation using a mixture of ammonia and air at two different temperature variants (300 and 350 °C). Nitrogen introduction was carried out on stages of demineralised precursor, pyrolysis product, and oxidising activator. The elemental composition, acid-base properties, and textural parameters of the obtained carbon adsorbents were determined. The activated carbons were investigated for their ability to remove nitrogen dioxide. The results demonstrated that the ammoxidation process incorporates new nitrogen-based functional groups into the activated carbon structure. Simultaneously, the ammoxidation process modified the acid-base characteristics of the surface and negatively affected the textural parameters of the resulting adsorbents. Furthermore, the study showed that all of the obtained carbon adsorbents exhibited a distinct microporous texture. Adsorption tests were carried out against NO2 and showed that the carbon adsorbents obtained were highly effective in removing this gaseous pollutant. The best sorption capacity towards NO2 was 23.5 mg/g under dry conditions and 75.0 mg/g under wet conditions.
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  • 文章类型: Journal Article
    亚临界水微环境对其理化性质的影响,研究了南瓜多糖(SWESPs)的抗氧化活性和体外消化。经过单因素实验,在不同的提取温度(110、130、150、170和190°C)和提取时间(4、8、12和16分钟)下成功制备了20个样品。在低温环境下,整个过程主要基于SWESP的提取。此时,SWESP的颜色为白色或浅灰色,分子质量高。当温度为150℃时,由于SWESP的提取和降解达到平衡,在150°C(12分钟)时达到最大提取率(18.67%)。与传统方法相比,亚临界水提取的南瓜SWESP产率高3-4倍,耗时少。在高温条件下,SWESPs被降解,其抗氧化能力和粘度降低。同时,美拉德和焦糖化反应使SWESPs变成黄褐色,并产生有害物质。此外,不同的SWESPs对体外消化有不同的影响。简而言之,不同条件下制备的SWESPs具有不同的结构和理化性质,允许获得所需的多糖。结果表明,在不同亚临界水态下制备的南瓜多糖具有良好的开发潜力和在食品工业中的应用。
    The effects of subcritical water microenvironment on the physiochemical properties, antioxidant activity and in vitro digestion of polysaccharides (SWESPs) from squash were investigated. After single-factor experiments, twenty samples were successfully prepared at different extraction temperatures (110, 130, 150, 170 and 190 °C) and extraction times (4, 8, 12 and 16 min). Under a low temperature environment, the whole process was mainly based on the extraction of SWESP. At this time, the color of SWESP was white or light gray and the molecular mass was high. When the temperature was 150 °C, since the extraction and degradation of SWESP reached equilibrium, the maximum extraction rate (18.67%) was reached at 150 °C (12 min). Compared with traditional methods, the yield of squash SWESP extracted by subcritical water was 3-4 times higher and less time consuming. Under high temperature conditions, SWESPs were degraded and their antioxidant capacity and viscosity were reduced. Meanwhile, Maillard and caramelization reactions turned the SWESPs yellow-brown and produced harmful substances. In addition, different SWESPs had different effects on in vitro digestion. In brief, SWESPs prepared under different conditions have different structures and physicochemical properties, allowing the obtainment of the required polysaccharide. Our results show that squash polysaccharides prepared in different subcritical water states had good development potential and application in the food industry.
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