**2. Açaí and bacaba as functional food**

The food industry has high expectations in food products that meet the consumers' demand for a healthy lifestyle. In this context, functional food plays a specific role, which is not only to satisfy hunger but also to provide humans the necessary nutrients. It also prevents nutritionrelated diseases and increases their physical and mental well-being [9].

In Brazil, there are two kinds of functional food: açaí and bacaba (see **Figure 1**), which are oleaginous fruits, present black-violet color, and are from typical palm trees in the Amazon region. They belong to the *Arecaceae* family and when processed with water, form an emulsion. Both are commercially exploited for the production of foods and beverages. The juices of bacaba and açaí are considered tasty and much appreciated by the Amazonian population. In the period between harvests of açaí, from December to April, bacaba has the highest sales potential, in a relay system [10, 11].

The functional quality of bacaba oil was analyzed by Pinto [12] through the determination of atherogenicity index (AI) and thrombogenicity index (TI) proposed by Ulbricht and Southgate [13] and hypocholesterolemic/hypercholesterolemic ratio (h/H) suggested by Santos-Silva et al. [14]. The results of AI, TI, and h/H were satisfactory. Although the values of AI and TI were low, h/H was high in levels that show bacaba oil could be regarded as cardioprotective, suggesting the direct consumption of it in the form of table oil, similar to olive oil, or in encapsulated form as a phytopharmaco. In the same study, bacaba oil was used for coating iron oxide for the synthesis of Fe3 O4 magnetic nanoparticles (MNP). The results showed that the oil well replaced the oleic acid, with the formation of MNP with morphological and desirable

**Figure 1.** Bacaba (**a**) and açaí (**b**) berries.

associated with the application of their vegetable oils and aromas in technological and industrial processes. Because of this, there is a greater investment in such plants extraction sector,

Because of this biodiversity, there is a wide variety of oleaginous species, as is the case of andiroba (*Carapa guianensis*), tucumã (*Astrocaryum vulgare*), buriti (*Mauritia flexuosa*), palm (*Elaeis guineensis, Jacq*), açaí (*Euterpe oleracea*), and bacaba (*Oenocarpus bacaba*). These species experimentally have a high yield in vegetable oils, with the potential for production of biologically active natural products, the so-called bioactive compounds, which have a high value added. Among these, the fat-soluble vitamins carotenoids (provitamin A), tocopherols (provitamin E and antioxidant), dyes, and flavonoids (anthocyanins, which are dyes with antioxidant

The characteristics of the Amazon region are conducive to the proliferation of palm trees, among which there are the oleaginous ones that are commercially cultivated with already fully established management technology, as is the case of açaí and bacaba, which can be considered new "superfruits." The consumption of these fruits pulps has been increasing, mainly due to the benefits that are being showed by scientific papers. Açaí, for example, has a high economic potential, mainly due to its use in the preparation of açaí beverages, which are

Besides the folk use as a drink, studies suggest that substances present in both berries have therapeutic properties such as hypocholesterolemic and neuroprotection effects. These therapeutic effects are related to fatty acids, which can prevent serious problems such as coronary heart disease, hypertension, and depression [2, 3]. The presence of phenolic compounds in their composition also gives them properties such as antimicrobial and

Another group of compounds with significant presence in açaí and bacaba is anthocyanins. Anthocyanins are plant-derived compounds belonging to the flavonoids subgroup of phenolic compounds. Besides antioxidative properties, anthocyanins are the focus of studies for

Among the various methods of obtaining natural extracts, the process of supercritical fluid extraction has become appropriate and of great interest to the food industry, pharmaceutical, and cosmetic technology. It provides the obtainment of products free of residual solvents and with superior quality, while preserving the organoleptic properties of the material. The most

has a high solubility, and allows performing low-temperature processes, which are perfect for the extraction of thermosensible compounds, as is the case of, for example, anthocyanins.

The food industry has high expectations in food products that meet the consumers' demand for a healthy lifestyle. In this context, functional food plays a specific role, which is not only to

), which is inert, nontoxic,

application on humans against diseases such as cancer and Alzheimer's [6–8].

used solvent in the supercritical technology is carbon dioxide (CO2

**2. Açaí and bacaba as functional food**

causing an expansion of the domestic and international markets.

156 Superfood and Functional Food - An Overview of Their Processing and Utilization

exported all over the world as an energetic drink [1].

effects) can be highlighted.

antioxidant effects [4, 5].

magnetic characteristics. MNP have therapeutic features, being used as drug carriers in the treatment of cancer by magnetic induction, reducing collateral effects to patients.

Açaí, being a source of fibers and rich in antioxidants, has considerable potential for nutritional applications and in the health field as a functional food or dietary supplement [15]. The work conducted by Barbosa et al. [2] evaluated the effect of a diet with daily consumption of açaí pulp in the prevention of oxidative damage by measuring the activity of antioxidant enzymes and the use of protein biomarkers in healthy women. The results showed that the açaí intake increased the activity of catalase, an intracellular enzyme which is also known as hydroperoxidase, able to decompose the hydrogen peroxide (H2 O2 ), which is associated with various pathologies connected to oxidative stress; the results also showed an increase in total antioxidant capacity and a reduction in the production of reactive oxygen species. These studies reveal the antioxidant effect of açaí, increasing the understanding of its beneficial health properties.

The antioxidants found in açaí and bacaba are necessary to prevent the formation and oppose the actions of reactive oxygen species (ROS) and reactive nitrogen species (RNS), which are continuously formed in the human body. Mechanisms of free radicals such as these are related to various human diseases, including cancer, atherosclerosis, malaria, rheumatoid arthritis, and neurodegenerative diseases. Many components of the diet such as carotenoids and plant pigments are suggested as important antioxidants; however, the interest in phenolic compounds of plants, particularly flavonoids, is also increasing. Thus, diets based on functional foods rich in antioxidants are important for the maintenance of human health [16–19].
