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\section*{Introduction}
Food industry plays a role in our modern society that goes beyond the production and distribution of food products. This industry is also responsible for controlling the quality and safety of its products, as well as to meet the demands from consumers. Among these demands, we can cite
the demand for foods with
preserved quality\cite{Jokerst2012} from the production to
their home-shelf. In this context, there is a growing interest in the development of active and smart polymers that
could can be applied to the food industry. These
polymers polymers, such as carobhydrate polymers, can be
applied used in the development of active films
and or in the microencapsulation of bioactive
compounds. When developed as films, carbohydrates can be compounds, being part of an active package with antimicrobial or antioxidant properties\cite{25442712}, or part of a chemical sensor able to indicate food spoilage\cite{25159445, 24979322, Maciel_2014, Silva_Pereira_2015, Pereira_2015}. Currently many studies have been carried out with the aim of evaluate the antioxidant capacity
and colorimetric properties of
carobohydrate films, targeting their use as active
packaging, for the reason that packaging. Concerning antioxidant films, the incorporation of antioxidant natural extracts in films can improve the shelf life of
food products and decreases
oxidation in food\cite{_imkovic_2014}. its oxidation\cite{_imkovic_2014}. Therefore, new studies evaluating the effect of application of tocopherols~\cite{Marcos2014}, carotenoids, essential oils~\cite{Ramos2014}, phenolic compounds\cite{I_iguez_Franco_2012}, curcuminoids~\cite{Bittencourt2014}, vitamin C, flowers~\cite{Samsudin2014}, seaweeds~\cite{Cian2014}, leaves, roots~\cite{Tongnuanchan2013} and residues of food industry~ \cite{Ferreira2014}, in fish~\cite{BarbosaPereira2014}, meat~\cite{Contini2014}, beverages and cereals have been developed.
On the side of Smart sensor films, such as colorimetric~\cite{Pacquit2006, Pacquit2007, Wu2013, Yoshida2014, PereiraJr2014a, Zhang2014}, radiofrequency~\cite{Length2010}, photochromic~\cite{Kreyenschmidt2010}, bacterial growth kinetic~\cite{Zhang2013}, intelligent inks~\cite{Mills2005}, oxygen indicators~\cite{Vu2013, Eaton2002} and nanotechnology sensor systems~\cite{Duncan2011} have been developed and successfully tested both in academy and in the industry. Concerning microencapsulation,
it has been used for numerous applications in several industry segments and has been widely used in the food industry for protection and controlled release of bioactive compounds, enzymes, probiotics and
micronutrients.This micronutrients. This is a technology that presents potential application for food
industry, however, industry. Due to the
incorporation current importance of
microparticles smart biopolymers in
new food
products is a challenge, since safety, storage conditions industry as films and
sensory properties of microparticles, this chapter will discuss the
product can not be negatively affected encapsulation. challenge of development and use of smart polymers in food industry.
