# Technologies and Fabrication of Intelligent Packaging for Perishable Products
## 1 Introduction  
Perishable products such as seafood, fruits, and vegetables are important items used in the daily live so many people. One common characteristic of perishable products is that they have a short shelf life and are prone to decay. The consumption of such decayed perishable products may lead to illness or even death. In the United States, approximately 9000 deaths occur each year owing to diseases caused by spoiled perishable products [1]. In Spain, 0.06% of people suffer from diseases very year. Besides the health hazards, substantial economic loss is another grave concern in the supply chain of perishable products. Because of the ineffective management of perishable products in the supply chain, especially during transportation, almost one-third of the products intended for human consumption are lost or wasted annually [2; 3]. The large volumes of food waste have also become a significant financial burden for the food industry in the supply chain [4; 5]. Packaging is essential for perishable products, as it protects them from contamination, damage, and decay along the supply chain [6]. There are two main techniques through which packaging can be improved: active packaging and intelligent packaging. [PERSON] and [PERSON] have reviewed both methods. They concluded that the two methods both helped in the monitoring and preserving of quality of perishable products [7]. Active packaging is an innovative packaging system that eitherreleases substances into or absorbs substances from the perishable products or their surrounding environment to maintain their quality and to extend their shelf life. In the past, researchers primarily focused on active packaging, however, in recent years advances in information technology and demand on effective management along the supply chain have led to a shift in research focus to intelligent packaging [6; 8]. There is a growing need for perishable product companies to enable the packaging of their products to include more information on the product status and the environment conditions inside or outside the package [8]. Hence, there is a strong need for the development of intelligent packaging for the perishable product industry to allow for the improved protection of product quality and reduced economic losses. Intelligent packaging or smart packaging was defined as \"a packaging system that is capable of carrying out intelligent functions (such as detecting, sensing, recording, tracing, communicating, and applying scientific logic) to facilitate decision making for the extension of shelf life, enhancement of safety, improved quality through the provision of information and to notify about possible problems\" [9]. In Europe, the legal definition of \"intelligent food contact materials and articles\" is \"materials and articles that monitor the condition of packaged food or the environment surrounding the food\" [10]. The basic functions of an intelligent package include tracking the products, monitoring the surrounding environment, and communicating with the backend system or consumers. Consequently, intelligent packaging can provide consumers or food suppliers with the condition of a food product and its storage environment. Also, nearly warning signal is given when there is an abnormal occurrence [11]. The basic functions of traditional food packaging: protection, communication, convenience, and containment have been enriched by the new development of intelligent packaging [9]. [PERSON] et al. proposed that intelligent packaging systems must include three main technologies, i.e., (i) indicators, a more convenient way of informing consumers about the quality of the food; (ii) data carriers, for storage and distribution of data including tracking; and (iii) sensors, for the rapid and accurate quantification of the analyses [4]. There are some other intelligent tools that can be applied in addition to these main intelligent packaging techniques [12].