不同包装及变温条件下榛子碎货架期预测模型建立与分析

Establishment and Analysis of Shelf Life Prediction Models of Hazelnut Scraps with Different Packing and Temperature Storage Conditions

近年来,榛子碎作为一种添加在焙烤、冷饮等食品中的原辅料,一直深受国内外消费者的欢迎。榛子仁含有丰富的脂肪,榛子碎作为榛子的初级加工产品,和榛子仁一样如果在不适宜的条件下贮存,极易氧化导致油脂酸败,而合理的包装可以有效抑制其氧化。通过测定普通包装、充氮包装、真空包装,3种包装方式在不同贮藏温度下过氧化值与酸价指标的变化,建立动力学模型并结合Arrhenius方程来预测0~40℃下榛子碎的货架期。结果表明:随着贮藏时间的延长、温度的升高,榛子碎的酸价和过氧化值不断上升,低温贮藏能有效延缓榛子酸败程度。以品质指标建立的动力学模型的变化规律符合一级动力学模型且R2>0.90,结合Arrhenius方程计算出的货架期模型具有较好的拟合性。以过氧化值和酸价为指标建立的榛子碎货架期预测值模型误差小于13%。基于酸价和过氧化值这两种指标的比较,以酸价指标的榛子碎货架期预测模型可行性更高。从包装效果上来看,充氮包装能够更有效地延缓榛子碎氧化酸败,真空包装条件下榛子碎货架期预测模型更为准确。

In recent years,chopped hazelnut is a kind of raw material added in baked,cold drinks and other foods,which has been welcomed by consumers at home and abroad.The hazelnut is rich in fat,among which the ground hazelnut is used as a primary processed product.Like hazelnuts,this oxidizes and leads to rancid oil if stored under unsuitable conditions.Reasonable packaging can effectively inhibit its oxidation.In this study,ordinary packaging,nitrogen-filled packaging and vacuum packaging were measured.For these three packaging methods,the changes of peroxide value and acid value index under different storage temperature.The kinetic model was established,which could be combined with the Arrhenius equation to predict the shelf life of hazelnut crush at 0-40℃.The results showed that the storage time began to lengthen and the temperature increased,among which the acid value and peroxide value of hazelnuts increased continuously.Low temperature storage can delay the rankness of hazelnut effectively,which is the change rule of dynamic model established by quality index.It conforms to the first-order dynamic model and R2>0.90.Arrhenius equation is set,which can be used to calculate the shelf life model with good fitting.Peroxide value and acid value were used as indicators,and the error of the prediction model of shelf life of hazelnut crushed was less than 13%.Based on the comparison of these two indicators,the prediction model of shelf life of hazelnut crushed based on acid value and peroxide value was more feasible.In terms of packaging effect,nitrogen-filled packaging can delay the oxidation and rancidity of hazelnut crushed more effectively.Under vacuum packing condition,the shelf life prediction model of hazelnut crushed was more accurate.