纳米包装材料对酱鸭贮藏品质的影响

[目的]研究纳米包装材料对酱鸭的保鲜效果。[方法]分别采用纳米银聚乙烯保鲜袋和普通聚乙烯保鲜袋对新鲜酱鸭进行包装,在4和25℃贮藏28 d,每7 d对酱鸭进行一次感官评价,并测定其中的挥发性盐基氮含量、菌落总数等指标。[结果]纳米包装材料能较好地保持酱鸭的风味,降低鸭肉挥发性盐基氮的产生,并抑制微生物的生长繁殖。[结论]与普通聚乙烯包装材料相比,纳米包装材料对酱鸭的保鲜效果较好。     

“新工科”背景下“包装测试”课程教学改革与探索——以黑龙江八一农垦大学为例

在"新工科"背景下,从教学内容、教学方法、考核方式、实验设计等方面探索了"包装测试"课程的教学改革。通过以新技术成果扩充教学内容,实施"课堂教学+网络教学"的混合式教学模式、注重过程化考核方式,优化和创新实验设计,极大地提高了课程质量,为"新工科"背景下复合应用型包装工程专业人才培养途径提供参考。     

Adjuvant effect enhancement of porcine interleukin-2 packaged into solid lipid nanoparticles

In this paper, we investigated the enhancement of adjuvant effects of porcine IL-2 (pIL-2) by packaging it into a solid lipid nanoparticle (SLN) delivery system. SLN–pIL-2 was prepared using hydrogenated castor oil and Polylactide-co-glycolide by double emulsion solvent evaporation methods (w/o/w). In animal trials, BALB/c mice were immunized with inactivated foot and mouth disease virus (FMDV) antigen combined with the SLN–pIL-2 adjuvant on days 0 and 14. Antibody titer, splenocyte proliferation, and secretion of IFN-γ and IL-4 cytokines were determined. Our results showed that SLN–pIL-2 could significantly enhance FMDV-specific antibody level compared with recombinant pIL-2 alone (p < 0.05). In addition, SLN–pIL-2 significantly increased the proliferative responses of antigen-specific spleen cells. Furthermore, SLN–pIL-2 induced the secretion of IFN-γ at a level higher than that induced by recombinant pIL-2 alone. Our results indicate that packaging recombinant pIL-2 in SLNs can be an effective way of boosting the effectiveness of pIL-2 as an adjuvant to enhance immune responses of vaccines.     

犬精液冷冻与人工授精的研究——Ⅱ稀释液和冻精剂型对犬冻精解冻后活力的影响

从6条公犬采集其浓份精液36次.分别在稀释液Ⅰ和Ⅱ中冷冻成三种剂型的冻精(颗粒0.5ml细管和安瓿),根据解冻后活力比较其优劣.研究表明:稀释液Ⅰ中三种剂型的平均解冻后活力(0.35±0.04)显著高于稀释液Ⅱ(0.23± 0.05;P<0.01);两种稀释液中颗粒冻精的平均冻后活力(0.34±0.08)显著地高于细管(0.26±0.09;P<0.01)和安瓿(0.26±0.08;P<0.01);细管和安瓿之间差异不显著(P>0.05).     

Slowly odor-evaporating polyethylene film containing surface-modified celite powder

Celite powder surface-modified with cationic surfactant was used to make polyethylene (PE) specialty film that can be contrasted with ordinary film in having high odor storing capacity and long odor lasting period. Mechanical properties of the films were sacrificed as more celite particles were included, whether celite surface was modified or not. The film with CTAB-modified celite showed the best odor storing and lasting properties for five different flavors ofodor, three artificial and two natural ones, among the kinds of films developed. Comparisons among the different films are made, together with brief discussion about the reason for differences in odor lasting period and possible application to packaging industry.     

传统卤水（石膏）豆腐包装技术研究

[目的]为实现豆腐的产业化生产提供技术支持。[方法]在传统卤水（石膏）豆腐加工技术的基础上,增加包装工艺,使传统豆腐得以包装。[结果]豆腐包装加工技术方案的原料、筛选、计量、浸泡、水洗、磨制、分离、煮浆、豆浆、点浆阶段与传统豆腐加工工艺相同。豆腐包装加工技术在豆浆点浆完成后,将调配卤水（或石膏）后的豆浆趁热装入灌装盒内,灌装量根据成品豆腐含水量确定;灌装盒由上下两部分组成,下部是普通的豆腐盒,上部是一个上下相通的筒,筒口径与豆腐盒开口处的口径大小、形状一致;在灌装盒中完成蹲脑,蹲脑时间一般保持20～25 m in,然后挤压脱水,挤压脱水完成后,除去活塞及上部分的筒,用封口机将豆腐盒封口,然后贴标即为成品。[结论]该包装工艺为实现传统豆腐的产业化生产奠定了技术基础。     

创新实践型包装工程与设计专业人才培养研究

针对现有包装工程与设计专业培养模式存在的问题进行分析,提出了包装工程与设计专业创新实践型人才培养模式,并探讨了该模式的改革思路、构建原则、创新性培养思路及课程体系的构建。     

包装形式和贮藏条件对柠檬冻干片在贮藏过程中色泽变化的影响

[目的]寻求适用于柠檬冻干片的包装材质及其合适的贮藏条件。[方法]以真空冷冻干燥方法加工出的柠檬干片为试材,探讨不同包装形式和不同贮藏条件对柠檬冻干片色泽变化的影响。[结果]贮藏温度、氧气和光照均会令柠檬冻干片产生不同程度的褐变,且贮藏温度对柠檬冻干片的色泽变化影响最大,其次是氧气,再次是光照强度。[结论]选择避光、脱氧包装并于低温条件贮藏更利于柠檬冻干片的色泽保持。     

气调包装技术用于虾皮保鲜的效果研究

为改进虾皮贮藏质量,延长货架期,研究了气调包装(Modified Atmosphere Packaging)对虾皮的保鲜效果。采用3种不同浓度配比的N₂和CO₂气体和真空包装等方法对虾皮进行包装,分别于5℃、室温和35℃下贮藏。检测虾皮感观、色差、菌落总数和脂肪含量。结果表明：低温有利于虾皮保鲜,高浓度CO₂气调贮藏能抑制虾皮中的微生物繁殖,减缓脂肪蚝蛤败速度,但CO₂浓度过高易使虾皮产生异味,影响感观品质。气调与低温结合可延长虾皮的保鲜期2个多月,推荐的气调气体比例为70%N₂/30%CO₂,低温冷藏。     

不同药剂和包装处理对甜樱桃生理、品质及贮藏性的影响

研究了不同药剂和包装处理对贮藏期间甜樱桃果实生理和品质变化的影响。试验结果表明，包装和药剂处理组合对控制果实腐烂，保持果实硬度和颜色，减缓维生素Ｃ和可滴定酸含量的下降速率，抑制乙烯和乙醇生成都具有较明显的效果。但是药剂和包装处理并不影响贮藏期间果实可溶性固形物的含量。生物 １号药剂与 ０．０４ ｍｍ厚加有ＴＢＺ的聚乙烯塑料薄膜袋配合对减缓果实衰老，减少果实腐烂和保持果实品质的效果最好。