不同阻隔性包装材料对大米储藏品质的影响

本文对高温高湿条件下，不同包装材料对大米品质变化的影响进行分析研究，得出大米品质变化的影响规律。通过测定包装袋内气体成分、水分含量、总酸、脂肪酸、光透差等指标，得出高阻隔性包装材料、特别高阻湿性包装材料能够确保储藏期间大米的品质。     

贮存环境相对湿度对大米霉变影响的研究

大米的吸湿性影响其贮藏稳定性,是品质劣变的诱因.通过在不同相对湿度环境和由低到高的温度变化条件下贮藏大米,研究了包装大米的吸湿特性,检测了大米霉变情况,并对大米进行了感官评定.结果显示在干燥环境中,袋中大米品质的变化主要是失水引起的米粒爆裂;在潮湿环境中大米霉变速度随环境相对湿度的增加而明显加快,并且加速了大米品质劣变.     

高水分优质大米保鲜包装的实验研究

针对含水量15.86%(质量分数)的高水分优质大米,通过测定储藏期间大米含水量、脂肪酸、粘度、还原糖等的变化,得出利用硅橡胶薄膜对气体选择性吸收的特性,可以有效的调节包装内氧气和二氧化碳含量,从而确保储藏期高水分大米的品质.     

贮藏温度及包装薄膜对青菜品质的影响

研究了不同贮藏温度和薄膜包装袋对青菜采后贮藏期间生理品质变化的影响,测定了薄膜的透气率和青菜的失重率、呼吸强度、维生素C含量,并进行了感官评价.研究结果表明,低温贮藏和薄膜包装的结合可以有效地抑制青菜的呼吸速率,减少营养成份的损失,延长青菜的货架寿命.同时,使用LDPE无孔密实袋(0.04mm)包装效果最佳.     

大米保鲜包装实验研究

通过对大米不同的保鲜包装方式进行实验研究,针对大米在储藏过程中品质变化和陈化机理的影响,提出不同大米保鲜包装方式对大米的含水量变化、脂肪酸变化、还原糖含量变化以及粘度变化的影响,得出不同保鲜包装方式与大米保鲜效果之间的关系,为大米的保鲜包装提供了一些基础理论数据,并对实验结果进行了分析研究,得出大米品质变化的影响因素及规律。     

大米保鲜包装技术实验研究

通过对大米真空保鲜包装方式进行实验研究,针对大米在储藏过程中品质变化和陈化机理,提出不同保鲜包装方式对大米的含水量变化、脂肪酸变化、还原糖含量变化以及粘度变化的影响,提出大米最佳保鲜包装材料、方法及参数,建立了大米保鲜包装的动力学模型,为大米的保鲜包装提供了参考依据,并对实验结果进行了分析研究,得出大米品质变化的影响因素及规律.     

低压静电场结合包装对采后樱桃番茄品质的影响

目的 研究常温环境下低压静电场(Low Voltage Electrostatic Filed,LVEF)结合不同商业包装处理对樱桃番茄果实贮藏品质的影响,探索基于LVEF处理的樱桃番茄采后常温货架期间适宜的商业包装方式。方法 待测樱桃番茄随机分为LVEF处理组、LVEF+PP组、LVEF+PET组和无任何处理的对照组,在温度为(23±1)℃和相对湿度为75%的同一培养箱中储存16 d,LVEF处理在整个储存期内持续进行,定期测定樱桃番茄在贮藏期间的品质变化。结果 LVEF处理能抑制质量损失率和丙二醛含量的上升,同时减缓亮度、硬度、可溶性固形物、可滴定酸、抗坏血酸和番茄红素含量的下降。在LVEF贮藏环境下,PET包装在采后樱桃番茄的质量、硬度、色度、可溶性固形物和抗坏血酸等质量指标方面优于PP包装和未包装的樱桃番茄。结论 LVEF处理对采后樱桃番茄有一定保鲜效果,且在LVEF贮藏环境下,PET包装樱桃番茄比PP包装的保鲜效果更好。     

气调贮藏果蔬品质的影响因素分析

从果蔬的营养成分、硬度和呼吸作用等指标对果蔬的品质进行了分析;介绍了当今贮藏效果最佳的气调贮藏技术,它通过调节环境的气体成分使得果蔬的呼吸作用减弱,以降低营养成分的消耗,保持果蔬的营养价值和新鲜品质;研究发现,贮藏条件对果蔬品质的影响很大,保证果蔬品质的良好必须有适宜的贮藏条件,贮藏过程中影响果蔬品质的因素有温湿度、空气流速、气体成分、包装和运输等;最后分析了在不同温度、不同时间的贮藏条件下,几种果蔬品质的变化.     

常温下功能集成包装袋在甜玉米保鲜中的应用

目的常温条件下延长新鲜甜玉米的保鲜时间,为常温运输提供条件。方法使用面积比例不同的高透氧薄膜和高透水薄膜制作保鲜包装袋,用其对甜玉米进行包装贮藏,以裸放甜玉米为对照,在温度为(25±1)℃,相对湿度为(60±5)%的条件下进行保鲜实验。每天对包装袋内的氧气和二氧化碳含量变化、甜玉米质量损失率、玉米籽粒硬度、可溶固形物含量、总酸含量、Vc含量以及感官品质进行测定和分析。结果裸放组样品失重迅速,其可溶固形物含量明显降低,实验进行到第2天时甜玉米就已经失去了商品价值。在实验组中,由于2种薄膜自身的透气性能不同,使得包装袋内氧气含量迅速降低、二氧化碳迅速升高。这样的贮藏环境有效抑制了甜玉米的呼吸等生理活动,使玉米的营养物质、感官评价等指标保持在较好的水平。结论功能包装袋可以将甜玉米的货架期延长到4～5 d。     

真空包装大米贮藏品质影响因素的研究

探讨了不同真空度、环境条件和贮藏时间对大米贮藏品质的影响。选用了市售天津小站大米为研究对象,选定不同真空度对其进行了真空包装,在不同环境条件下进行了模拟贮藏,定期测定了样品中的脂肪酸值、水分和还原糖含量,采用正交设计方法对测定结果进行了分析,确定了影响真空包装大米贮藏品质的主要因素。结果表明,在短期内,真空度是影响大米贮藏品质的最主要因素。     

储存温度对不同包装材料包装的大米品质的影响研究

为了了解温度对不同包装材料包装的大米品质的影响规律,对不同包装材料包装的大米进行了温湿度加速试验,以大米的褐变值、含水量、脂肪酸含量、粘度、霉变为指标,研究了温度对大米品质的影响。结果表明,在相对湿度为90%时,随着储存温度升高和时间的延长,储藏大米的水分含量、粘度、明度值逐渐降低,脂肪酸含量急剧上升,并产生以青霉、黑霉为主的霉菌。     

Impact of bag-in-box packaging on the quality attributes of cabbage (Brassica oleracea var. capitata)

Cabbage is one of the most widely grown, traded and consumed vegetables in the world. Therefore, it is vital to maintain cabbage quality after harvest; it is especially critical to counteract water loss in order to maintain quality during storage. In this study, we investigated the effect of a bag-in-box packaging on water loss in cabbages during 15 days of storage at 10°C and 90% relative humidity. The bag-in-box packaging included a low-density polyethylene bag along with a corrugated board box, whereas the control comprised a corrugated board box without any waterproofing ability. The changes in green colour, soluble solids content and ascorbic acid content of cabbage were evaluated as fundamental qualities. After storage, water loss from control samples was evaluated to be 6%; however, the bag-in-box packaging reduced the water loss to 0.3%. Moreover, the bag-in-box did not affect the tested fundamental qualities despite a delay in the cooling process. In conclusion, the bag-in-box packaging could be effective at maintaining the quality of cabbages and other leafy vegetables during storage and distribution for 15 days.     

基于多孔聚氨酯-聚丙烯酸/丙烯酰胺智能材料的恒湿包装设计

以自制多孔聚氨酯-聚丙烯酸/丙烯酰胺(PU-PAA/AM)智能恒湿材料为基础,设计了一种具有防震缓冲和恒湿性能的包装材料,根据其吸湿量与吸湿时间、平衡含湿量与相对湿度的关系,提出了通过控制预吸湿时间来实现存储包装内环境湿度恒定的方法和公式。将防震缓冲和恒湿性能有机结合起来,在武器装备贮运包装领域具有很大的应用价值。     

Etodolac-liquid-filled dispersion into hard gelatin capsules: an approach to improve dissolution and stability of etodolac formulation

The formation of melt dispersion is an effective method of increasing the dissolution rate of poorly soluble drugs, and hence, of improving the bioavailability. The carrier fusion method was used to prepare different dispersion of etodolac using Gelucire 44/14 and D-alpha-tocopheryl polyethylene glycol 1000 succinate (TPGS). The physical characteristics of the binary systems were determined by differential scanning calorimetry (DSC), infrared spectroscopy (IR). The release rate from the resulting dispersion was determined from dissolution studies by use of USP dissolution apparatus II (paddle method). The dissolution rate of etodolac is increased in all the dispersion systems compared to that of pure drug. A liquid dispersion system of etodolac (20%) and Gelucire 44/14: TPGS blend (80%), in different ratios, was also prepared. The capsule formulation was subjected to stability studies at different temperature and humidity conditions as per ICH guidelines. Physical and chemical properties of the dispersion didn't change during a period of storage at room temperature and at 4 degrees C, 0% RH. It was found that etodolac was chemically stable against the effects of temperature and humidity. However, the relative humidity and storage time exerted an effect on the dissolution behavior of etodolac. The changes in dissolution behavior after storage under conditions of high humidity and temperature might be related to the formation of etodolac microcrystal and to water absorption by the carrier during storage. It is predicted that acceptable shelf-lives should result when moisture-resistant packaging is used for pharmaceutical formulations of this type.     

典型湿度条件下某双基发射药的安全储存寿命预估

弹药装配过程中需要控制湿度以避免静电危害。为了确保火炸药安全储存寿命预估的准确性,加速老化试验中应加入湿度条件。以某双基发射药为研究对象,以装药工房湿度上限（相对湿度75%）作为其老化湿度条件,考察湿度封装及裸药干燥条件下样品的失效模式及预估寿命。结果表明:两种试验条件下,样品的机械感度、热分解温度均无显著变化;初始燃速随老化时间的增加而增大,但达到的最大压力不变;安定剂含量随老化时间的增加而明显下降。以安定剂质量分数消耗50%为失效判据,该双基发射药30 ℃、75%湿度封装与裸药干燥条件下的安全储存寿命分别为9.7 a和11.4 a,表明壳体内的微湿度环境对药剂的安全储存寿命具有显著影响。     

Effects of Storage Humidity on the Mechanical, Microstructural, and Drug Release Properties of Hydroxypropylmethylcellulose-Based Hydrophilic Matrix Tablets

The effects of storage humidity on the properties of hydroxypropylmethylcellulose (HPMc)-based hydrophilic matrix tablets were investigated. Hydrochlorothiazide tablets prepared with HPMCs of different thickening capacities were stored for 6 months (a) at a relative humidity corresponding to the prestorage equilibrium moisture content of the HPMCs, or (b) at a higher relative humidity. Only tablets stored at the higher humidity showed significant changes in properties, indicating that the observed changes (reduced crushing strength, increased total porosity, and increased mean pore diameter) were due to water uptake. All changes were completed within 1 month of storage. Drug release properties were unaffected, even after 6 months. Effectively identical results were obtained regardless of whether the HPMC variety used had a nominal viscosity of 4,000 cP or 100,000 cP.     

山梨酸钾包装对猕猴桃贮藏品质的影响

目的研究山梨酸钾包装对猕猴桃常温条件下贮藏品质的改善作用。方法以猕猴桃为研究对象,采用山梨酸钾薄膜包装、普通薄膜包装、山梨酸钾浸泡的处理方式进行常温贮藏,以未作任何处理的猕猴桃作为空白对照。在贮藏期间,每隔3 d测定猕猴桃中纤维素含量、果胶含量、总酚含量、纤维素酶活性和果胶酶活性等细胞壁代谢指标,以及可滴定酸含量、可溶性固形物含量、淀粉酶活性等品质指标。结果在贮藏12 d后,山梨酸钾包装的猕猴桃总酚含量分别比普通薄膜包装、山梨酸钾浸泡处理和空白组高10.8%,16.4%,30.1%;在贮藏期间,山梨酸钾包装的猕猴桃其纤维素酶、果胶酶和淀粉酶的最高活性(以蛋白质计)分别为6125 U/g,3634 U/mg,1756 U/mg,显著低于山梨酸钾浸泡组、普通包装组和空白组;3种处理方式的猕猴桃中可滴定酸含量无显著性差异。结论山梨酸钾包装对贮藏期猕猴桃品质劣变的抑制作用优于山梨酸钾浸泡和普通薄膜包装,能够抑制贮藏期间细胞壁代谢相关酶活性的上升,减缓了猕猴桃果实的腐烂进程。