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Heat‐sealing and microscopic evaluation of paper‐based coated materials using various seal bar geometries in vertical form fill seal machine 在垂直形式填充封口机中使用各种密封条几何形状对纸基涂层材料进行热封和微观评估
IF 2.6 4区 工程技术 Q2 ENGINEERING, MANUFACTURING Pub Date : 2023-04-25 DOI: 10.1002/pts.2735
M. Merabtene, P. Tanninen, Johann Wolf, Fabian Kayatz, M. Hauptmann, E. Saukkonen, Antti Pesonen, Teija Laukala, J. Varis, Ville Leminen
With the growing emphasis on minimization of global plastic waste, flexible fibre‐based packaging has gained significant interest over the past few years. Heat‐sealing technology is commonly applied for vertical form‐fill‐seal machine to provide tight closure of packages for maintaining food quality and shelf life. Several different seal bar geometries and adequate heat‐seal parameters are required to improve the seal tightness of the packages. This study aims to compare the heat sealability of thermoplastic film (OPP/PE) and paper‐based materials in vertical form‐fill‐seal machine using various seal bar profiles. The investigation includes seal strength measurement, understanding the causes of leak formation, seal tightness and inspection of the seal using scanning electron microscopy. Results reveal that OPP/PE material has exceptional seal strength and leakproof ability compared with paper‐based materials. However, it has limited operating window because the material shrinks and coarsens at approximately 140°C. Sealing temperature and dwell time are found to be the major factors affecting the seal strength of paper‐based material. Results reveal the PE‐coated papers exhibit nearly twice the seal strength compared with the dispersion‐coated paper. It was difficult to achieve good hot‐tack values with dispersion‐coated paper. During testing, all the paper‐based materials experience delamination and fibre tear, and its severity increases with the increasing material grammage. As plateau temperature is reached, the fibre delamination remains relatively constant. The serrated geometry of seal bar design plays a significant role in providing a satisfactory airtight seal, particularly around the pouch's layer jump. However, flat seal bar designs are not recommended for gas tight applications for paper‐based materials.
随着对全球塑料废物最小化的日益重视,软性纤维包装在过去几年中获得了极大的兴趣。热封技术通常应用于垂直形式-填充-封口机,以提供紧密的包装,以保持食品质量和保质期。需要几种不同的密封棒几何形状和适当的热密封参数来提高封装的密封性。本研究的目的是比较热塑性塑料薄膜(OPP/PE)和纸基材料在垂直成型-填充-封口机中使用各种密封条型材的热封性能。调查包括密封强度测量,了解泄漏形成的原因,密封密封性和使用扫描电子显微镜检查密封。结果表明,与纸基材料相比,OPP/PE材料具有优异的密封强度和防泄漏能力。然而,由于材料在约140°C时收缩和变粗,其操作窗口有限。密封温度和保温时间是影响纸基材料密封强度的主要因素。结果表明,PE涂布纸的密封强度几乎是分散涂布纸的两倍。分散涂布纸很难获得良好的热粘值。在测试过程中,所有纸基材料都经历了分层和纤维撕裂,其严重程度随着材料克重的增加而增加。当达到平台温度时,纤维分层保持相对恒定。锯齿形状的密封条设计在提供令人满意的气密密封方面起着重要作用,特别是在袋的层跳周围。然而,平面密封条设计不推荐用于纸基材料的气密应用。
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引用次数: 1
Evaluation of the antimicrobial activity of sodium alginate films integrated with cinnamon essential oil and citric acid on sliced cooked ham 海藻酸钠与肉桂精油、柠檬酸复合膜对熟火腿片的抑菌效果评价
IF 2.6 4区 工程技术 Q2 ENGINEERING, MANUFACTURING Pub Date : 2023-04-20 DOI: 10.1002/pts.2733
Melissa Lee, N. Rüegg, S. Yildirim
Bio‐based antimicrobial films have been developed using sodium alginate and 6 wt% of cinnamon essential oil (CEO) as a volatile antimicrobial substance and 4 and 6 wt% of citric acid (CA) as a non‐volatile antimicrobial substance. Antimicrobial activity of the films was tested in in vitro tests against Escherichia coli and Listeria innocua by disc diffusion or vapour diffusion assay. Sodium alginate films containing CA exhibited a zone of inhibition between 30.86 ± 2.55 and 45.87 ± 1.90 against E. coli and L. innocua in the disc diffusion assays. Films containing CEO also showed significant antimicrobial activities in the vapour diffusion assays that resulted in a log reduction of 5.3 for E. coli and 3.2 for L. innocua after 6 days. Antimicrobial activities of all films were also tested against L. innocua on sliced cooked ham. Films containing CEO did not prevent the growth of L. innocua inoculated on ham. On the other hand, sodium alginate films with CA fully inhibited the growth of L. innocua on ham during storage at 7.5°C for 12 days resulting in a bacterial count below the detection limit after 12 days. The addition of antimicrobial substances in sodium alginate films resulted in a slight colour change (but significant) and reduced the tensile strength of the films significantly. Adding CA to sodium alginate films increased the moisture content (from 24.81% to 35.41–48.02%) as well as the elongation at break (from 11.3% to 22.6–33.2%) of the films.
生物基抗菌膜是用海藻酸钠和6%的肉桂精油(CEO)作为挥发性抗菌物质,4%和6%的柠檬酸(CA)作为非挥发性抗菌物质开发的。采用圆盘扩散法和蒸汽扩散法对该膜进行了对大肠杆菌和李斯特菌的体外抑菌试验。在圆盘扩散试验中,海藻酸钠膜对大肠杆菌和无害乳杆菌的抑制率在30.86±2.55 ~ 45.87±1.90之间。在蒸汽扩散试验中,含有CEO的薄膜也显示出显著的抗菌活性,6天后,大肠杆菌的对数降低了5.3,innocua的对数降低了3.2。并对各膜在切片熟火腿上的抑菌活性进行了试验。含有CEO的膜对接种在火腿上的无头菌生长没有阻止作用。另一方面,添加CA的海藻酸钠薄膜在7.5°C条件下保存12 d,充分抑制了无头杆菌在火腿上的生长,12 d后细菌数量低于检出限。在海藻酸钠薄膜中加入抗菌物质会导致轻微的颜色变化(但明显),并显着降低薄膜的抗拉强度。在海藻酸钠薄膜中添加CA使薄膜的含水率从24.81%提高到35.41 ~ 48.02%,断裂伸长率从11.3%提高到22.6 ~ 33.2%。
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引用次数: 0
Effect of food simulants on stability of copper oxide in bionanocomposite food packaging film 食品模拟剂对生物纳米复合食品包装膜中氧化铜稳定性的影响
IF 2.6 4区 工程技术 Q2 ENGINEERING, MANUFACTURING Pub Date : 2023-04-20 DOI: 10.1002/pts.2734
Nattinee Bumbudsanpharoke, Busarin Chongcharoenyanon, N. Harnkarnsujarit, Seongyoung Kwon, Seonghyuk Ko
Addition of copper oxide nanoparticles (CuONPs) to poly (butylene‐adipate‐co‐terephthalate) (PBAT)/thermoplastic starch (TPS) biopolymer blend produced bionanocomposite films with improved mechanical and oxygen barrier properties, as well as enhanced other benefits including antimicrobial activity. In this study, the PBAT/TPS‐CuO bionanocomposite films with varying CuONPs contents (0.05%, 0.5%, 1%, and 2%) were challenged by food simulants (10% ethanol represented to aqueous food and 3% acetic acid represented to acidic food) in accordance with European Regulation 10/2011. CuONPs in the bionanocomposite films demonstrated good stability when exposed to 10% ethanol; however, it was dissolved in 3% acetic acid. The X‐ray diffraction and the energy dispersive spectroscopy results showed that CuONPs in the film were completely lost after acid exposure, whereas CuONPs in the films exposed to 10% EtOH were preserved. The maximum overall migration value was 5.0 mg/dm2. Inductively coupled plasma optical emission spectroscopy was used to confirm the presence of Cu in the simulants. The highest soluble Cu value of 12.39 mg/kg was detected from PBAT/TPS‐CuO2%, while migration value decreased as concentration ratio in film decreased. Although both values were within the threshold limits established by current legislation for non‐specific migration limit substances in food contact materials, the properties of bionanocomposite were altered. The mechanical properties of a post‐migrated PBAT‐TPS/CuO films taken from acidic conditions were reduced by 22% in tensile strength and 53% in elongation at break due to holes and microcracks on the film surface observed by scanning electron microscope. The average sealing strength of all bionanocomposite films decreased by about 25% after acid exposure. The oxygen permeability, on the other hand, was significantly improved, with a 16.3% reduction. Because the film had lost all of its active agent, film was unable to inhibit Escherichia coli growth. While 3% acetic acid caused dissolution of CuONPs and significant changes in properties of PBAT/TPS‐CuO film, 10% ethanol caused very minor to no changes in bionanocomposite film properties.
将氧化铜纳米粒子(CuONPs)添加到聚己二酸丁二酸酯(PBAT)/热塑性淀粉(TPS)生物聚合物共混物中,产生的生物纳米复合膜具有更好的机械和氧屏障性能,以及增强的其他益处,包括抗菌活性。在这项研究中,根据欧洲法规10/2011,用食品模拟剂(10%乙醇代表含水食品,3%醋酸代表酸性食品)挑战具有不同CuONPs含量(0.05%,0.5%,1%和2%)的PBAT/TPS‐CuO生物纳米复合膜。当暴露于10%乙醇时,生物纳米复合膜中的CuONPs表现出良好的稳定性;然而,它被溶解在3%的醋酸中。X射线衍射和能谱分析结果表明,酸处理后薄膜中的CuONPs完全丢失,而10% EtOH处理后薄膜中的CuONPs则被保留。最大总迁移值为5.0 mg/dm2。采用电感耦合等离子体发射光谱法证实了模拟物中Cu的存在。PBAT/TPS‐CuO2%溶液的可溶性Cu值最高,为12.39 mg/kg,迁移值随膜内浓度比的降低而降低。虽然这两个值都在食品接触材料中非特异性迁移限制物质的现行立法规定的阈值范围内,但生物纳米复合材料的特性发生了变化。通过扫描电镜观察,在酸性条件下迁移后的PBAT - TPS/CuO薄膜的拉伸强度降低了22%,断裂伸长率降低了53%,这是由于薄膜表面存在孔洞和微裂纹。酸暴露后,所有生物纳米复合膜的平均密封强度下降了约25%。另一方面,氧渗透率显著提高,降低了16.3%。由于薄膜失去了所有的活性物质,因此薄膜无法抑制大肠杆菌的生长。3%的乙酸会导致CuONPs的溶解和PBAT/TPS‐CuO膜性能的显著变化,而10%的乙醇对生物纳米复合膜性能的影响很小甚至没有变化。
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引用次数: 0
Smart tag packaging technologies: A qualitative investigation of consumers' needs and expectations 智能标签包装技术:消费者需求和期望的定性调查
IF 2.6 4区 工程技术 Q2 ENGINEERING, MANUFACTURING Pub Date : 2023-04-10 DOI: 10.1002/pts.2731
N. Htun, A. Wiśniewska, G. Nocella, E. Santa Cruz, A. Peracaula‐Moner, K. Vehmas, L. Hakola, K. Liczmańska-Kopcewicz, Lee Bridgett, K. Verbert
In this paper, we attempt to better understand concerns, needs and expectations of European consumers towards the use of intelligent packaging technologies as this topic appears to need further investigation from a marketing point of view. Thus, this study contributes to the currently limited body of research on the application of smart tag technologies on food packaging by exploring information benefits to consumers and by providing insights for marketers on how these technologies could be further employed to create value for consumers, manufacturers and regulatory bodies.
在本文中,我们试图更好地了解欧洲消费者对使用智能包装技术的关注,需求和期望,因为这个话题似乎需要从营销的角度进一步调查。因此,本研究通过探索消费者的信息利益,并为营销人员提供如何进一步利用这些技术为消费者、制造商和监管机构创造价值的见解,为目前有限的食品包装智能标签技术应用研究做出了贡献。
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引用次数: 1
Seal materials in flexible plastic food packaging: A review 软性塑料食品包装中的密封材料综述
IF 2.6 4区 工程技术 Q2 ENGINEERING, MANUFACTURING Pub Date : 2023-04-09 DOI: 10.1002/pts.2732
Bram Bamps, M. Buntinx, Roos Peeters
Flexible packaging has many advantages in the food industry, arising from low weight, formability, multilayer complexity and cost. Heat sealing is a very efficient technique to close flexible food packaging. Currently, many thermoplastic materials are used in seal layers. A seal can be formed when these materials are heated and brought into contact; thereafter, polymer chains diffuse across the seal interface and entangle. Hydrogen bonds, polar and ionic interactions are molecular forces that can come into play, depending on the thermoplastic materials that are used in the seal layer. Bonds between identical polymers, referred to as autohesion, are formed in pouch applications (e.g., horizontal and vertical form‐fill‐seal packages). In lidding applications, the flexible film is sealed to a rigid cup, tray or bottle, whereby bonds can be formed between non‐identical polymers because the materials are often provided by different suppliers. All heat seal technologies imply heating of seal layers but differ in the heating principle. In the food industry and in most scientific seal studies, the seals of mono‐ and multilayered packaging are mainly formed by conductive heating. Recently, the use of emerging technologies, such as ultrasonic and laser heating, is increasingly described in recent papers. Applied seals are characterized by strength after a specified cooling time. Immediately after heating, this strength is referred to as hot tack. A good seal performance is crucial to guarantee food safety and quality. Besides strength, tightness is important to prevent food degradation, caused by microorganisms and external gases, and to keep aromatic gases inside the package. This review aims to give a literature overview that can support stakeholders in the food industry to improve and optimize the material selection in flexible packaging, in order to obtain seals with desired tightness and strength. Heat seal studies on materials and seal technology of flexible food packaging, such as pouches and lidding films, are considered. Scientific data are categorized from a materials' perspective, based on chemical structure, which is revealed by chemical and thermal analysis. A majority of the seal studies is categorized in a first section on polyolefins as seal layers. The following sections describe the seal functionality of (i) ethylene copolymers, such as ionomers; and (ii) polyesters, such as poly (ethylene terephthalate), pol (lactic acid) and poly (butylene succinate). The role of plasticizers, fillers and other additives in the seal performance is also described. Finally, material properties, such as chain length and melting temperature (Tm), as underlying causes of seal performance, are summarized.
软包装在食品工业中具有重量轻、可成形、多层复杂和成本低等优点。热封是一种非常有效的封闭软性食品包装的技术。目前,许多热塑性材料用于密封层。当这些材料被加热并接触时,可以形成密封;此后,聚合物链扩散穿过密封界面并缠绕在一起。氢键、极性和离子相互作用是可以发挥作用的分子作用力,这取决于密封层中使用的热塑性材料。相同聚合物之间的键,称为自粘连,在袋应用中形成(例如,水平和垂直形式-填充-密封包装)。在盖子应用中,柔性薄膜被密封在刚性杯子、托盘或瓶子上,由于材料通常由不同的供应商提供,因此可以在不相同的聚合物之间形成键。所有热密封技术都是对密封层进行加热,但加热原理不同。在食品工业和大多数科学密封研究中,单层和多层包装的密封主要是通过导电加热形成的。最近,使用新兴技术,如超声波和激光加热,在最近的论文中越来越多地描述。应用密封件的特点是经过规定的冷却时间后的强度。加热后,这种强度被称为热胶。良好的密封性能是保证食品安全和质量的关键。除了强度外,密封性对于防止微生物和外部气体引起的食品降解以及保持包装内的芳香气体也很重要。这篇综述的目的是给出一个文献综述,可以支持食品行业的利益相关者,以改善和优化软包装的材料选择,以获得密封所需的紧密性和强度。研究了软性食品包装的材料和密封技术,如小袋和盖膜。科学数据是从材料的角度分类的,基于化学结构,这是通过化学和热分析揭示的。大多数密封研究在第一部分中对聚烯烃作为密封层进行了分类。以下章节描述了(i)乙烯共聚物的密封功能,如离聚体;(ii)聚酯,如聚对苯二甲酸乙酯、聚乳酸和聚丁二酸丁二酯。还介绍了增塑剂、填料和其他添加剂在密封性能中的作用。最后,总结了材料性能,如链长和熔化温度(Tm),作为密封性能的潜在原因。
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引用次数: 1
Measurement and analysis of truck vibration levels in logistic Spain distribution to simulate package testing 西班牙物流配送中货车振动水平的测量和分析,以模拟包装测试
IF 2.6 4区 工程技术 Q2 ENGINEERING, MANUFACTURING Pub Date : 2023-04-03 DOI: 10.1002/pts.2730
Marta Garrido, Laura Esteban, Patricia Navarro, N. Herranz, Francisco Javier Zabaleta, V. Rouillard
The aim of this study was to measure the vibration levels in one of the types of truck most used in Spain for the shipment of packaged goods, formed by tractor unit and air‐suspension semi‐trailer with 26 tonnes (26 000 kg) payload capacity, considering the most representative routes of the main Spanish road network. The data presented in this study will enable the development of new specific vibration tests and will help product and package engineers to reduce damage in transit. In this study, 30 transport routes recording nearly 10 000 km of the Spanish main road network have been selected and analysed, and power spectral density (PSD) profiles are provided to simulate truck transport in Spain using random vibration test methods. The resulting PSD profiles were established by generating two grms levels (0.21 and 0.15) obtaining the highest intensity from the calculation of the upper one‐sided normal tolerance limit (NTL) (30,95,50) and an average intensity profile at −6 dB with respect to the calculated NTL curve, which represents 70% of the lowest grms values of the study. This study uses NTL analysis to explore the vibration characteristics of a typical heavy goods transport vehicle type for various routes along main highways in Spain and propose new transport simulation test protocols dedicated to the Spanish main road distribution environment.
本研究的目的是测量西班牙最常用的一种卡车的振动水平,这种卡车由牵引车和空气悬架半挂车组成,有效载荷能力为26吨(26000公斤),考虑到西班牙主要道路网络中最具代表性的路线。本研究中提供的数据将有助于开发新的特定振动测试,并将帮助产品和包装工程师减少运输过程中的损坏。在本研究中,选择和分析了西班牙主要道路网络中记录近10000公里的30条运输路线,并提供了功率谱密度(PSD)曲线,使用随机振动测试方法模拟西班牙的卡车运输。通过计算单侧正常容限(NTL)上值(30、95、50)获得的最高强度和相对于计算的NTL曲线在- 6 dB处的平均强度分布图(代表研究中最低grms值的70%),产生了两个grg水平(0.21和0.15),从而建立了所得的PSD分布图。本研究采用NTL分析方法,探讨了西班牙主要公路沿线各路线典型重型货物运输车辆类型的振动特性,并提出了新的针对西班牙主要公路分布环境的运输模拟试验方案。
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引用次数: 0
Life cycle assessment of multiple dispensing systems used for cosmetic product packaging 化妆品包装用多种配药系统的生命周期评估
IF 2.6 4区 工程技术 Q2 ENGINEERING, MANUFACTURING Pub Date : 2023-03-31 DOI: 10.1002/pts.2729
Shambhavi Rathore, Breanna Schuler, Jonghun Park
Worldwide, the packaging industry for consumer product goods, including personal care and beauty products, generates over $25 billion in sales. An extremely high environmental impact follows the large demand in the industry. Almost 70% of the plastic waste generated in the cosmetics market is not recyclable. Sustainability in the beauty industry is complex and multifaceted, requiring an evaluation of all factors. Packaging plays an important role in the cosmetics market, and considering the amount of waste it generates, it is essential to understand packaging dispensing systems from an environmental perspective. This study investigated the environmental impacts of three dispensing systems commonly used for cosmetic product packaging: the general dip‐tube pump, the airless pump and the bag‐in‐bottle format. A cradle‐to‐grave life cycle assessment (LCA) was performed to quantitatively analyse the environmental burden of those three different dispensing systems, using a facial cream as a test case. The LCA analysed the environmental impacts generated by the packaging materials and incorporated the environmental impacts created by the facial cream residue left behind in each dispensing system. The system boundary of this LCA included the material production, intermediate processes, distribution, use and end‐of‐life phases of the packaged facial cream products. The LCA complied with the ISO standards, 14,040:2006 and 14,044:2006, and LCA software SimaPro v 9.0 was used to analyse the results. The life cycle inventories used in this LCA included US‐EI 2.2, USLCI and Ecoinvent 3. TRACI 2.1, including ten mid‐point life cycle impact categories, was chosen as the life cycle impact analysis method. Comparative and contribution analyses were conducted to interpret the LCA data. The comparative analysis demonstrated that the airless pump packaging system had less environmental burden than the other two packaging systems for all the life cycle impact categories. The bag‐in‐bottle alternative had the highest environmental impact for eight of the ten impact categories. The contribution analysis results revealed that the packaging material production phase most contributed to the environmental burden of all three packaging formats, followed by the lotion residue.
在全球范围内,包括个人护理和美容产品在内的消费品包装行业的销售额超过250亿美元。该行业的巨大需求对环境产生了极高的影响。化妆品市场产生的近70%的塑料垃圾是不可回收的。美容行业的可持续性是复杂和多方面的,需要对所有因素进行评估。包装在化妆品市场中扮演着重要的角色,考虑到它产生的废物量,从环境的角度了解包装分配系统是至关重要的。本研究调查了化妆品包装中常用的三种配药系统对环境的影响:普通浸管泵、无气泵和袋装瓶形式。使用一种面霜作为测试案例,进行了从摇篮到坟墓的生命周期评估(LCA),以定量分析这三种不同分配系统的环境负担。LCA分析了包装材料产生的环境影响,并纳入了每个配药系统中遗留的面霜残留物所产生的环境影响。该LCA的系统边界包括包装面霜产品的材料生产、中间工艺、分销、使用和使用寿命结束阶段。LCA符合ISO标准14,040:2006和14,044:2006,LCA软件SimaPro v 9.0对结果进行分析。本LCA中使用的生命周期清单包括US‐EI 2.2、USLCI和Ecoinvent 3。选择TRACI 2.1作为生命周期影响分析方法,包括10个中点生命周期影响类别。对LCA数据进行了比较分析和贡献分析。对比分析表明,在所有生命周期影响类别中,无气泵包装系统的环境负担都小于其他两种包装系统。在10个影响类别中,塑料袋对环境的影响在8个类别中最高。贡献分析结果显示,包装材料生产阶段对三种包装形式的环境负担贡献最大,其次是洗液残留。
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引用次数: 1
Influence of different bio‐based and conventional packaging trays on the quality loss of fresh cherry tomatoes during distribution and storage 不同生物基和传统包装托盘对新鲜圣女果在配送和储存过程中品质损失的影响
IF 2.6 4区 工程技术 Q2 ENGINEERING, MANUFACTURING Pub Date : 2023-03-27 DOI: 10.1002/pts.2728
Imke Korte, A. Albrecht, M. Mittler, Claudia Waldhans, J. Kreyenschmidt
The quality loss and shelf life of cherry tomatoes stored in different types of commercially available bio‐based packaging trays were analysed and compared with the reference materials, corrugated cardboard and recycled polyethylene terephthalate (rPET). During storage under conditions reflecting points in a regional German supply chain, typical quality parameters were investigated. Surface bacterial counts of the packaging materials were investigated before and after storage, and material parameters were determined for selected packaging.
分析了不同类型的商用生物基包装托盘中储存的圣女果的质量损失和保质期,并与对照材料瓦楞纸板和再生聚对苯二甲酸乙二醇酯(rPET)进行了比较。在德国区域供应链中反映点的条件下,对典型的质量参数进行了研究。研究了包装材料储存前后的表面细菌计数,并确定了所选包装的材料参数。
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引用次数: 3
An intelligent indicator for warning of short‐term high CO2 damage to garlic scapes 大蒜鳞片短期高CO2损伤的智能预警指示器
IF 2.6 4区 工程技术 Q2 ENGINEERING, MANUFACTURING Pub Date : 2023-03-25 DOI: 10.1002/pts.2727
Hanyan Hu, Yahui Bai, Haichuan Li, Keyi Li, Y. Hu, Junran Chen
A pH‐sensitive indicator film based on CO2 change was prepared by mixing a water‐soluble indicator (bromocresol green and chlorophenol red sodium) with a film‐forming carrier (methyl cellulose (MC), polyvinyl alcohol (PVA) and glycerin). The innovation is not only to analyse the response characteristics of the colorimetric indicator to CO2, but also to optimise the preparation parameters of the film. The response experiment showed that CO2 dissolved rapidly in water and the pH value remained unchanged after reaching equilibrium, with a one‐to‐one relationship between pH and CO2 concentration. As the CO2 concentration rose from 18% to 20%, the colour of the indicator film changed from blue–purple to yellow–green in a different colour space, allowing the change to be easily distinguished by the naked eye. The optimum parameters (13 g‧L−1 MC, 5 g‧L−1 PVA, 10 g‧L−1 glycerin, 15 ml‧L−1 indicator and a casting amount of 0.2 ml‧cm−2) for preparing the intelligent film were optimised based on puncture strength (PS), water vapour permeability (WVP), water solubility (WS), casting time (CT) and colour performance. Evaluating this application using garlic scapes stored at 15°C revealed that the total colour difference was 34.23 as the CO2 concentration increased from 18.7% to 20.4%, and the colour of the indicator film changed from blue–purple to yellow–green. Therefore, the intelligent packaging film was able to effectively provide a warning when garlic scapes were exposed to damage from a short‐term high CO2 level.
通过将水溶性指示剂(溴甲酚绿和氯酚红钠)与成膜载体(甲基纤维素(MC)、聚乙烯醇(PVA)和甘油)混合,制备了基于CO2变化的pH敏感指示剂膜。创新之处在于不仅分析了比色指示剂对CO2的响应特性,而且优化了薄膜的制备参数。响应实验表明,CO2在水中快速溶解,pH值在达到平衡后保持不变,pH值与CO2浓度呈一一对应关系。当CO2浓度从18%上升到20%时,指示膜的颜色在不同的色彩空间中由蓝紫色变为黄绿色,这种变化很容易被肉眼分辨出来。基于穿刺强度(PS)、透气性(WVP)、水溶性(WS)、浇铸时间(CT)和颜色性能,优化了制备智能膜的最佳参数(13 g·L−1 MC、5 g·L−1 PVA、10 g·L−1甘油、15 ml·L−1指示剂和0.2 ml·cm−2浇铸量)。用15°C保存的大蒜景物评价,当CO2浓度从18.7%增加到20.4%时,总色差为34.23,指示膜的颜色由蓝紫色变为黄绿色。因此,智能包装薄膜能够有效地提供一个警告,当大蒜景观暴露于短期高二氧化碳水平的损害。
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引用次数: 1
A colour indicator film based on bromothymol blue/poly‐L‐lactic acid/polyvinylpyrrolidone for detecting bacteria 溴百里酚蓝/聚L乳酸/聚乙烯吡咯烷酮示色膜的细菌检测
IF 2.6 4区 工程技术 Q2 ENGINEERING, MANUFACTURING Pub Date : 2023-03-21 DOI: 10.1002/pts.2726
Lu Jia, Wuliang Sun, Wenbo Li, Yue Dong, Lingling Wu, M. A. Saldaña, Yang Gao, Ye Jin, Wenxiu Sun
The unintentional bacterial contamination in food seriously harms food quality and human health, so it is necessary to establish a real‐time bacterial detection method. Here, a colour indicator film was designed to detect bacterial by incorporating bromothymol blue (BTB) into degradable poly‐L‐lactic acid (PLLA) and polyvinylpyrrolidone (PVP). The colour indicator film was prepared into fibres by electrospinning technology. The colour indicator film showed colour responsiveness from yellow to green at different pH. The colour indicator film showed good colour stability at different temperature and humidity conditions. The colour indicator film was used for the detection of bacteria, and it was found that the colour indicator film could make a colour response visible to the naked eye according to different concentrations of bacteria, which showed the great potential of the colour indicator film in detecting bacteria.
食品中无意识的细菌污染严重危害食品质量和人体健康,因此建立实时的细菌检测方法十分必要。本文设计了一种颜色指示膜,通过将溴百里酚蓝(BTB)掺入可降解的聚乳酸(PLLA)和聚乙烯吡咯烷酮(PVP)中进行细菌检测。采用静电纺丝技术制备了彩色指示膜。示色膜在不同ph值下表现出从黄色到绿色的颜色响应性,在不同的温度和湿度条件下表现出良好的颜色稳定性。将示色膜用于细菌检测,发现示色膜可以根据不同浓度的细菌产生肉眼可见的颜色反应,显示出示色膜在检测细菌方面的巨大潜力。
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引用次数: 0
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Packaging Technology and Science
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