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当前位置: 首页 > 实验技术 > 果蔬采后 > 木薯壳聚糖复合涂层对绿芦笋货架期的影响
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木薯壳聚糖复合涂层对绿芦笋货架期的影响


来源: Edna Aroucha et al  发布日期: 2024-03-15  访问量: 103


多糖涂层是一种可生物降解的替代传统包装用于延缓蔬菜衰老。本工作研究了木薯和壳聚糖生物聚合物膜的性能及其作为食用涂层的用途
标签: 芦笋;改性气调;生物聚合物;物性;混合淀粉
 

Shelf-life of green asparagus using cassava and chitosan blend coating
Validade de espargos verdes usando revestimento de mistura de mandioca e quitosana

Edna Aroucha1* , Maria Anastasiadi2, Emma Collings2, Nicolas Araujo3, Leon Terry2
1Universidade Federal Rural do Semi-Árido (UFERSA), Departamento de Engenharia e Ciências Ambientais, Mossoro/RN - Brasil
2Cranfield University, Plant Science Laboratory, Bedfordshire - UK
3Universidade Federal de Viçosa, Departamento de Fitotecnia, Viçosa/MG - Brasil

Abstract
Polysaccharide coating is a biodegradable alternative to conventional packings used for delaying senescence in vegetables. This work investigated the properties of cassava and chitosan biopolymeric film and its use as edible coatings to preserve the shelf-life (7 °C and 70% relative humidity (RH)) of green asparagus, with previous cold storage (1 °C and 90% RH) for 7 days. Based on a previous assessment of the films obtained from a) cassava (2.5%), b) chitosan (0.5%), and c) a blend of cassava-chitosan (Cassava+) (2.5 + 0.5%), it could be verified that cassava-chitosan blend films showed improved barrier property (water vapor transmission rate (WVTR) of 38.06 g/(m2.h)) and mechanical properties, with tensile strength of 0.021 MPa, elongation at break of 1.93% and Young’s module of 0.011 MPa. Cassava+ based coating resulted in a lower weight loss and colour L* parameter and minimized textural changes in basal-section of commercial green asparagus spears during a shelf-life of seven days (7 °C and 70% RH), with previous cold storage. All coated spears maintained overall higher carbohydrate levels than the control, except to sucrose which gradually decreased in basal sections and increased in the apical sections of asparagus spears, irrespective of treatment. Edible coating did not affect asparagine concentrations which steadily increased throughout the shelf-life of the spears. The blend (Cassava+) kept for a longer the green asparagus quality. However, spears under a shelf-life of seven days (7 °C and 70% RH), with previous cold storage under 1 °C and 90% RH conditions, developed tip-rot physiological disorder.

多糖涂层是一种可生物降解的替代传统包装用于延缓蔬菜衰老。本工作研究了木薯和壳聚糖生物聚合物膜的性能及其作为食用涂层的用途,以保存绿芦笋的保质期(7°C和70%相对湿度),并预先冷藏(1°C和90%相对湿度)7天。基于先前对从a)木薯(2.5%)、b)壳聚糖(0.5%)和c)木薯-壳聚糖(cassava+)的共混物(2.5+0.5%)获得的膜的评估,可以验证木薯-壳多糖共混物膜显示出改善的阻隔性(水蒸气传输率(WVTR)为38.06g/(m2.h))和物理性能,拉伸强度为0.021MPa,断裂伸长率为1.93%,杨氏模量为0.011MPa。Cassava+基涂层降低了重量损失和颜色L*参数,并在7天(7°C和70%RH)的保质期内,将商品绿芦笋矛基部的质地变化降至最低。除了蔗糖外,所有包被的芦笋矛都保持着比对照更高的碳水化合物水平,无论处理如何,蔗糖在芦笋矛的基部逐渐减少,在顶端逐渐增加。可食用涂层不影响天冬酰胺的浓度,天冬酰胺浓度在矛的整个保质期内稳步增加。这种混合物(木薯+)能保持更长时间的绿色芦笋品质。然而,在7天的保质期(7°C和70%相对湿度)下,以及之前在1°C和90%相对湿度条件下的冷藏条件下,矛出现了尖腐病生理障碍。


Keywords: Asparagus officinalis; Modified atmosphere; Biopolymer; Mechanical properties; Blend; Starch.

 

关键词:芦笋;改性气调生物聚合物;物性;混合淀粉

···

2.3 Assessing the effect of cold storage and edible coating on asparagus shelf-life
After treatment with edible coating, a subset of spears (six spears) from each treatment (coated - T3 and uncoated - control) were randomly selected and packaged in trays wrapped with commercial polyvinyl chloride (12.7 μm thick) film (perforated with 9 small holes [ca. 1 mm diameter]) in triplicate. The trays were subsequently held under shelf-life conditions at 7 °C and 70% RH, in an environmental test chamber (Sanyo MLR-351H, Osaka, Japan) under artificial light (ca. 1358 lx) for up to seven days to simulate retail conditions.
Another random sub-sample of six spears per treatment was selected for physiological and biochemical analysis (baseline). The rest of the spears, approximately 36 spears, per treatment were placed inside Lock & Lock™ (12L) plastic storage boxes in a cold room set to 1 °C and 90% RH for 7 days. An ICA gas mixing system (Storage Control Systems Ltd, Kent, UK) was used to continuously supply synthetic air inside the boxes, which were fitted with an inlet and an outlet to allow continuous air exchange, preventing a build-up of CO2. Tissue paper soaked in deionized water was placed underneath freshness trays inside the boxes to maintain a high RH (ca. ≥ 90%). Relative humidity and box temperature were continuously monitored using Gemini Tiny Tag Ultra 2 logging data (95% RH, 25 to 85 °C temperature, part number; TGU-4500). The boxes were opened after 7 days at 1 °C and the spears were assessed for subjective quality parameters, and subsequently six spears per treatment were sampled for physiological and biochemical assessment. Furthermore, six spears per treatment were randomly selected for shelf-life assessment, following cold storage.


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