Extrusion

挤压
  • 文章类型: Journal Article
    在这项研究中,比较了四种不同类型的复合营养米(米粉加其他粗粮,豆类,土豆,和其他粉末,挤压为人造米粒)和普通大米。我们发现,复合营养大米的蛋白质和表观直链淀粉含量高于普通大米,分别高达9.775%和19.45%。γ-氨基丁酸(GABA)和抗性淀粉含量远低于普通水稻,膳食纤维含量与普通大米没有差异。傅里叶变换红外光谱(FTIR)和X射线衍射(XRD)分析结果表明,复合营养大米的淀粉性质和结构因高温高压加工而发生变化。特别是,淀粉的晶体结构变成V形。此外,人工品尝和品尝仪的结果表明,复合营养大米的味道普遍不如普通大米。总之,复合营养米存在营养不平衡、口感差等问题。复合营养米的口感品质还有很大的提升空间。因此,未来复合营养米的发展应注重营养平衡和口感改善。本文的研究结果也为此提供了一定的理论基础。
    In this study, it was compared the physicochemical properties and cooking taste quality between four different types of compound nutritional rice (rice flour with the addition of other coarse grains, legumes, potatoes, and other powders, extruded as artificial rice grains) and common rice. We found that the protein and apparent amylose contents of compound nutritional rice were higher than that of common rice, up to 9.775% and 19.45% respectively. The γ-aminobutyric acid (GABA) and resistant starch contents were much lower than in common rice, and the dietary fiber content did not differ from that in common rice. The results of Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analysis revealed that the starch properties and structure of the compound nutritional rice changed due to high temperature and high pressure processing. In particular, the crystalline structures of starch became V-shaped. In addition, the results of artificial tasting and tasting meter showed that the taste of compound nutritional rice was generally inferior to that of common rice. In summary, compound nutritional rice had problems such as nutritional imbalance and poor taste. There was still a lot of room for improving the taste quality of compound nutritional rice. Therefore, the future development of compound nutritional rice should focus on both nutritional balance and taste improvement. The results of this paper also provided a certain theoretical basis for this.
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  • 文章类型: Journal Article
    在这次调查中,对空心玻璃微球(MS)和羰基铁颗粒(CIP)的复合聚乳酸(PLA)体系进行了加工和表征,以研究在聚合物体系中使用导电和绝缘颗粒作为添加剂的影响。PLA-MS和PLA-CIP设定在3.94和7.77vol的两个水平。以研究颗粒材料类型和负载对纯PLA热性能的影响。在双螺杆挤出过程中观察到,CIP的添加大大降低了PLA熔体在加工过程中的粘度。使用热重分析确定的相关性,差示扫描量热法,热导率,和剪切流变学提供了对热稳定性如何受到影响的见解。MS和CIP的掺入改变了热性能,如玻璃化转变温度(Tg),熔化温度(Tm),和冷结晶温度(Tcc)。与具有PLA的那些相比,金属CIP填充的系统的热导率值和粘弹性转变有很大的增加,这与在挤出过程中观察到的过热有关。
    In this investigation, composite poly(lactic acid) (PLA) systems of hollow glass microspheres (MS) and carbonyl iron particles (CIP) were processed and characterized to investigate the effects of using conductive and insulating particles as additives in a polymer system. PLA-MS and PLA-CIP were set at the two levels of 3.94 and 7.77 vol.% for each particle type to study the effects of the particle material type and loading on neat PLA\'s thermal properties. It was observed during the twin-screw extrusion that the addition of CIP greatly decreased the viscosity of the PLA melt during processing. Correlations determined using thermogravimetric analysis, differential scanning calorimetry, thermal conductivity, and shear rheology provided insights into how thermal stability was affected. The incorporation of MS and CIP altered thermal properties such as the glass transition temperature (Tg), melting temperature (Tm), and cold crystallization temperature (Tcc). The metal CIP-filled systems had large increases in their thermal conductivity values and viscoelastic transitions compared to those with PLA that were correlated with the observed overheating during extrusion.
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  • 文章类型: Journal Article
    本研究旨在开发一种用于食品包装的增值生物基聚合物产品。聚(3-羟基丁酸酯-共-3-羟基戊酸酯)(PHBV)是一种有前途的生物塑料,其加工性能和脆性受到限制,我们小组先前通过掺入与过氧化物和助剂相容的高分子量天然橡胶(NR)来解决。然而,在工业环境中的可加工性证明是困难的。环氧咖啡油(COE),一种源自废物的增塑剂,通过挤出掺入PHBV/NR/过氧化物/助剂基质中,并评价所得片材的性能。COE的掺入显着降低了PHBV/NR片材的氧气和水渗透性。最高降解温度Tpeak(°C)增加了约4.6°C,相对于原始PHBV,结晶度降低了约15.5%,表明良好的热稳定性。PHBV/NR共混物的熔融温度(Tm)和玻璃化转变温度(Tg)在COE掺入下保持不变。X-射线衍射(XRD)显示增塑共混物的晶体尺寸减小约10.36%。能量色散X射线分析(EDAX)和扫描电子显微镜(SEM)证实了良好的分散而没有相分离。增塑共混物的吸水率降低了61.02%,而表面接触角测量显示改进的耐水性。塑化的PHBV片材由于其高热稳定性而显示出环保包装膜的前景,有效的阻隔性能,和工业可扩展性。
    This study aimed to develop a value-added bio-based polymer product for food packaging. Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) is a promising bioplastic with limitations in processability and brittleness, which our group previously addressed by incorporating high-molecular-weight natural rubber (NR) compatibilized with peroxide and coagent. Yet, processability in an industrial setting proved difficult. Coffee oil epoxide (COE), a waste-derived plasticizer, was incorporated into the PHBV/NR/peroxide/coagent matrix via extrusion, and properties of resulting sheets were evaluated. COE incorporation significantly decreased the oxygen and water permeability of the PHBV/NR sheets. Maximum degradation temperature Tpeak (°C) increased by ~4.6 °C, and degree of crystallinity decreased by ~15.5% relative to pristine PHBV, indicating good thermal stability. Melting (Tm) and glass transition temperatures (Tg) of the PHBV/NR blend remained unchanged with COE incorporation. X-ray diffraction (XRD) revealed ~10.36% decrease in crystal size for the plasticized blend. Energy-dispersive X-ray analysis (EDAX) and scanning electron microscopy (SEM) confirmed good dispersion with no phase separation. The water uptake capacity of the plasticized blend was reduced by 61.02%, while surface contact angle measurements showed improved water resistance. The plasticized PHBV sheet shows promise for environmentally friendly packaging films due to its high thermal stability, effective barrier properties, and industrial scalability.
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  • 文章类型: Journal Article
    非常规蛋白质来源目前作为食品成分被广泛研究。这项研究旨在评估1.5%和3%的野板球粉(GB)及其2-8%的混合物(1:1)与螺旋藻粉(S)对营养价值的影响,物理化学性质,玉米挤出物的感官特性。此外,添加2%发酵粉(BP)以评估其对富集挤出物的性质的影响。结果表明,GB和GB+S都提高了营养价值,随着蛋白质含量增加高达46%和更高水平的必需氨基酸,尤其是亮氨酸和缬氨酸。然而,这些成分降低了膨胀率(高达15%),颜色亮度(高达30%),和黄色(高达47%),并增加了玉米挤出物的硬度(高达25%)。S添加对产品的储存稳定性有积极影响,但降低了其感官接受度,尤其是香气和味道。BP的添加减轻了较高的GB和GB+S浓度的负面影响,特别是在感官特征上。总之,与GB相比,加入高达6%的GB+S混合物可提供更高的蛋白质含量,产品特性仅有微小变化。评分超过4.2分表明这些零食的良好可接受性。
    Unconventional protein sources are currently extensively studied as food ingredients. This study aimed to evaluate the effect of 1.5% and 3% field cricket powder (GB) and 2-8% of its mixture (1:1) with spirulina powder (S) on the nutritional value, physicochemical properties, and sensory characteristics of corn extrudates. Additionally, 2% baking powder (BP) was added to assess its impact on the properties of the enriched extrudates. The results showed that both GB and GB + S improved nutritional value, with protein content increasing by up to 46% and higher levels of essential amino acids, particularly leucine and valine. However, these ingredients decreased the expansion ratio (by up to 15%), colour lightness (by up to 30%), and yellowness (by up to 47%) and increased the hardness (by up to 25%) of the corn extrudates. The S addition positively influenced product storage stability but decreased its sensory acceptance, especially aroma and taste. The BP addition mitigated the negative effects of higher GB and GB + S concentrations, particularly on sensory characteristics. In conclusion, incorporating up to 6% of the GB + S mixture provides a higher protein content with only minor changes to the product\'s characteristics compared to GB. Ratings exceeding 4.2 points indicate the good acceptability of these snacks.
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  • 文章类型: Journal Article
    尽管黑小麦在谷物食品生产中具有潜力,但在干面食中使用天然和麦芽黑小麦(MT)面粉的使用受到限制。在这项研究中,配制并分析了以小麦为基础的干意大利面,并增加了MT面粉的替代水平(0、25、50和75g/100gw/w)。分析样品的技术和营养特性,包括体外淀粉和蛋白质消化。用MT逐渐替代天然小黑麦面粉增加了总膳食纤维含量(p<0.05),而总淀粉含量下降(p<0.05)。添加MT面粉增加了煮熟面食的烹饪损失和粘性(p<0.05)。用MT面粉调制的体外淀粉消化,降低缓慢消化和抗性淀粉含量。使用最高替代水平的MT对体外蛋白质消化率产生了积极影响。总的来说,MT可用于配制干面食产品,以替代高达50g/100g的天然小黑麦,营养质量和技术特征之间的良好折衷。
    The use of native and malted triticale (MT) flour in dry pasta has been limited despite the potential of triticale in cereal-based food production. In this study, triticale-based dry spaghetti with increasing levels of substitution (0, 25, 50, and 75 g/100 g w/w) of MT flour were formulated and analyzed. Samples were analyzed for technological and nutritional traits, including the in vitro starch and protein digestions. The gradual substitution of native triticale flour with MT increased (p < 0.05) the total dietary fiber content, whereas total starch decreased (p < 0.05). Adding MT flour increased the cooking loss and the stickiness of cooked pasta (p < 0.05). Using MT flour modulated the in vitro starch digestion, lowering the slowly digestible and resistant starch contents. The in vitro protein digestibility was positively affected using MT at the highest substitution level. Overall, MT could be used to formulate dry pasta products being the substitution to native triticale up to 50 g/100 g, a good compromise between nutritional quality and technological characteristics.
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  • 文章类型: Journal Article
    研究了冻融循环(FTC)对冷冻膨化荞麦全粉(FEWBN)淀粉凝胶结构和品质特性的影响。反复的FTC处理引起直链淀粉的回生,从而增加了紧密度,结晶度硬度,和FEWBN的烹饪时间。然而,随着冻融循环次数的增加,面条中形成的较大体积的冰晶在一定程度上破坏了淀粉凝胶网络结构,导致面条脱水和脱水,和质量恶化。然而,发现FTC处理期间发生的中度直链淀粉回生有利于FEWBN的质量。经过一次FTC治疗,与没有FTC处理的烹饪损失(4.61%)相比,烹饪损失为3.53%甚至更低。经过7次FTC治疗,FEWBN的蒸煮损失为6.53%,破碎率仍为0,说明FEWBN能在一定程度上抵抗温度波动对冷冻食品内部结构的破坏,并保持良好的质量。本研究为开发冻融稳定性好、蒸煮品质高的荞麦面条奠定了基础。
    The effects of freeze-thaw cycles (FTC) on starch gel structure and quality characteristics of frozen extruded whole buckwheat noodles (FEWBN) were studied. The repeated FTC treatments induced the retrogradation of amylose which increased the compactness, crystallinity, hardness, and cooking time of FEWBN. However, with the increasing number of freeze-thaw cycles, the larger volume of ice crystals formed in the noodles destroyed the starch gel network structure to a certain extent, and led to the dehydration and syneresis of the noodles, and the quality deterioration. However, moderate amylose retrogradation occurred during the FTC treatment was found to be beneficial for the quality of FEWBN. After one time of FTC treatment, the cooking loss of 3.53 % was even lower compared with that without FTC treatment (4.61 %). After seven times of FTC treatment, the cooking loss of FEWBN was 6.53 %, and the breaking rate was still 0, indicating that FEWBN could resist the damage caused by temperature fluctuations on the internal structure of frozen food to a certain extent, and maintain good quality. This study establishes a fundamental basis for the development of buckwheat noodles with good freeze-thaw stability and high cooking quality.
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  • 文章类型: Journal Article
    脑室-腹膜分流术(VPS)经常用于神经外科治疗脑积水,特别关注儿科患者。虽然VPS通常使用,他们不能免于困难,如分流挤压。本研究的主要目的是提高对发生的理解,原因有助于,以及小儿患者VPS挤压的后果。
    实施了全面的搜索方法,包括电子数据库,包括PubMed,谷歌学者,还有Scopus,查找1950年1月至2023年5月发表的相关文章。关键词如“脑室-腹腔分流术”和“挤压术”的利用,\"\"脑室-腹腔分流术\"和\"迁移,采用“脑室-腹腔分流”和“穿孔”。患者人口统计数据,潜在的疾病,挤压的起源,出现症状,治疗,并收集了后续行动。进行了统计研究,以确定与分流挤出发生有关的潜在危险因素。
    一项研究分析了对120名使用挤压式VPS导管的个体的80项研究。大多数患者(55.8%)有脑脊液漏、刺激等症状。脑积水分为先天性(40%),阻塞性(36.7%),和交流组(11.7%)。导管挤压部位各不相同,大部分来自肛门或直肠部位。20%的患者存在术前脑膜炎或腹膜炎。治疗范围从分流去除到内镜下第三脑室造瘘术,导致90%的回收率,1.7%死亡率,和5%的后续损失。
    VPS中远端导管的挤压是一种需要紧急手术干预的危急医疗情况。感染的存在增加了并发症的可能性;因此,必须通过使用抗生素和更换分流器来迅速解决这一问题。及时干预可提高效果。
    UNASSIGNED: Ventriculoperitoneal shunts (VPSs) are frequently employed in neurosurgery to treat hydrocephalus, with a particular focus on pediatric patients. Although VPSs are commonly utilized, they are not exempt from difficulties, such as shunt extrusion. The main aim of this study is to enhance comprehension regarding the occurrence, causes contributing to, and consequences of VPS extrusion in pediatric patients.
    UNASSIGNED: A comprehensive search approach was implemented, including electronic databases, including PubMed, Google Scholar, and Scopus, to locate pertinent articles published between January 1950 and May 2023. The utilization of keywords such as \"ventriculoperitoneal shunt\" and \"extrusion,\" \"ventriculoperitoneal shunt\" and \"migration,\" and \"ventriculoperitoneal shunt\" and \"perforation\" was employed. Data on patient demographics, underlying diseases, origin of extrusion, presenting symptoms, treatment, and follow-up were gathered. Statistical studies were conducted to identify potential risk factors connected with the occurrence of shunt extrusion.
    UNASSIGNED: A study analyzed 80 studies on 120 individuals with extruded VPS catheters. The majority of patients (55.8%) had symptoms such as cerebrospinal fluid leakage and irritation. Hydrocephalus was categorized into congenital (40%), obstructive (36.7%), and communicating (11.7%) groups. Catheter extrusion sites varied, with most from the anal or rectal site. Preoperative meningitis or peritonitis was present in 20% of patients. Treatments ranged from shunt removal to endoscopic third ventriculostomy, resulting in a 90% recovery rate, 1.7% mortality, and 5% follow-up loss.
    UNASSIGNED: Extrusion of the distal catheter in VPSs is a critical medical situation that necessitates urgent surgical intervention. The presence of an infection raises the likelihood of complications; hence, it is vital to promptly address the issue through the administration of antibiotics and the replacement of the shunt. Timely intervention enhances results.
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  • 文章类型: Journal Article
    煮木薯根的主要属性之一是它在短时间内软化的能力,也就是所谓的饱餐。本研究旨在建立和验证标准操作程序,以评估煮熟的木薯根的可食性。二十种木薯基因型,包括地方品种和改良品种,被选中用于协议开发,另外还有10种基因型用于验证。烹饪之后,使用配备有五叶片渥太华细胞探针的纹理计评估木薯根的硬度和挤压完成的工作。使用经过训练的小组成员评估相同样品的感官质地分析参数,例如柔软度和咀嚼性。皮尔逊相关分析显示,感官柔软度和仪器质地测量值之间存在显著正相关(p<0.01)。以及柔软度和烹饪时间之间(p<0.01,r=0.94),咀嚼性和烹饪时间之间(p<0.05,r=0.81)。验证结果证实了烹饪时间之间的显著相关性(p<0.01),感官柔软度,和嚼劲。这些发现表明,烹饪时间可以作为一个可靠的指标,与感官属性密切相关,在确定煮木薯根的粘性。这种方法提供了一种实用的,用于评估木薯根粉质的中通量方法,对育种改良品种有影响,农民收养,和消费者的接受度。
    One of the major attributes of boiled cassava roots is its ability to soften within a short period, otherwise known as mealiness. This study aimed to establish and validate standard operating procedures for assessing the mealiness of boiled cassava roots. Twenty cassava genotypes, including landrace and improved varieties, were selected for the protocol development, with an additional ten genotypes used for validation. Following cooking, the cassava roots were evaluated for hardness and work done in extrusion using a texturometer equipped with a five-blade Ottawa cell probe. The same samples were assessed for sensory texture analysis using trained panelists for parameters such as softness and chewiness. Pearson\'s correlation analysis revealed significant positive correlations (p < 0.01) between sensory softness and instrumental texture measurements, as well as between softness and cooking time (p < 0.01, r = 0.94), and between chewiness and cooking time (p < 0.05, r = 0.81). Validation results confirmed significant correlations (p < 0.01) between cooking time, sensory softness, and chewiness. These findings suggest that cooking time can serve as a reliable indicator, closely associated with sensory attributes, in determining the mealiness of boiled cassava roots. This approach offers a practical, mid-throughput method for assessing cassava root mealiness, with implications for breeding improved varieties, farmers adoption, and consumer acceptance.
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  • 文章类型: Journal Article
    本研究的目的是通过挤出技术(Ex)从高粱和玉米中制备羟丙基衍生物(HP)速溶(部分冷水可溶胀)淀粉。对天然和羟丙基化(丙烯含量为5%和12%)淀粉挤出物进行了功能性评价,结构,热和流变性能。挤出物的发展为工业提供了便利,因为它们易溶于水性介质中并且不需要任何预先加热。所有挤出物的取代度(DS)在0.0083和0.1530之间变化,这在限制范围内,可以节省消耗。X-射线衍射(XRD)分析揭示所有挤出物呈现V型图案,而峰的强度由于羟丙基化而增加。淀粉挤出物显示出凝胶样行为,因为储能模量(G')大于损耗模量(G”)。观察到所有挤出物的非牛顿剪切稀化行为。在较低的温度下,在较高取代水平(12%)下的HP-Ex显示出比天然和低取代的挤出物更高的复数粘度。HP-Ex分散体的蠕变恢复比天然挤出物更明显,表明高粱和玉米淀粉挤出物具有弹性。差示扫描量热法(DSC)结果表明,观察到HP-Ex在较低温度下糊化,并且由于改性后其结构变弱,因此需要较低的糊化焓(ΔHgel)。
    The purpose of the present study to prepare hydroxypropyl derivatives (HP) instant (partially cold-water swell-able) starches via extrusion technique (Ex) from sorghum and corn. The native and hydroxypropylated (at propylene level 5 % and 12 %) starch extrudates were evaluated for functional, structural, thermal and rheological properties. The development of extrudates provides ease to industries as they are easily soluble in aqueous mediums and does not require any prior heating. The degree of substitution (DS) for all extrudates varied between 0.0083 and 0.1530 which is under limit and save to consume. The X-ray diffraction (XRD) analysis revealed that all extrudates exhibited V-type pattern while the intensity of peaks increased due to hydroxypropylation. The starch extrudates showed gel-like behavior since storage modulus (G\') was greater than loss modulus (G″). Non-Newtonian shear thinning behavior was observed for all extrudates. At lower temperature, HP-Ex at higher substitution level (12 %) demonstrated higher complex viscosity than native and low-substituted extrudates. Creep recovery of HP-Ex dispersion was more pronounced than native extrudates suggesting elastic nature of sorghum and corn starch extrudates. The differential scanning calorimetry (DSC) results revealed that HP-Ex were observed to gelatinize at lower temperatures and needed lower enthalpy of gelatinization (ΔHgel) because of their weakened structure after modification.
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  • 文章类型: Journal Article
    本研究开发了低合金Mg-Li-Er合金,并通过改变痕量Er含量和挤压温度获得了双峰晶粒结构。合金表现出良好的强度-延展性协同作用,即,拉伸屈服强度(TYS)为270MPa,伸长率(EL)为19.1%。微观结构表征表明,许多亚微米Mg24Er5颗粒的形成有利于变形晶粒内高密度的低角度晶界(LAGB)并抑制动态再结晶(DRX)。所得的粗糙的未DRXed晶粒具有强烈的基底结构和相当大的LAGB,连同精细的DRXed谷物,有助于高强度-延性协同作用。
    Low-alloyed Mg-Li-Er alloys were developed in this study and a bimodal-grained structure was obtained by varying the trace Er content and extrusion temperature. The alloys displayed a good strength-ductility synergy, i.e., a tensile yield strength (TYS) of 270 MPa and an elongation (EL) of 19.1%. Microstructural characterization revealed that the formation of numerous submicron Mg24Er5 particles favored a high density of low-angle grain boundaries (LAGBs) inside the deformed grains and inhibited dynamic recrystallization (DRX). The resultant coarse unDRXed grains with a strong basal texture and considerable LAGBs, together with the fine DRXed grains, contributed to the high strength-ductility synergy.
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