Bacche di acai

Bacche di acai (Euterpe oleracea Mart., sin. Euterpe badiocarpa Barb. Rodr.; Arecaceae)

Le bacche di acai (o açaí) sono i frutti di palme amazzoniche, riferite prevalentemente a Euterpe oleracea; Euterpe badiocarpa è un sinonimo tassonomico storico. La polpa porpora scuro è impiegata in alimenti e bevande, in estratti standardizzati e come ingrediente cosmetico con funzioni antioxidant ed emollienti.

Valore calorico (per 100 g di prodotto)

Polpa non zuccherata (congelata/purea): ~60–85 kcal/100 g.
Polvere liofilizzata di polpa: ~400–550 kcal/100 g.
Estratto idroalcolico: ~50–150 kcal/100 g (in base ai solidi e all’EtOH residuo).
Estratto glicerico/glicolico: ~150–300 kcal/100 g.
Estratto secco standardizzato (polvere): ~200–350 kcal/100 g.
Olio di polpa/seme: ~880–900 kcal/100 g.

Ai dosaggi d’uso alimentari l’apporto energetico dipende da forma e ricetta; “acai bowl” ricche di topping zuccherati possono risultare caloriche.

Principali sostanze contenute

Polifenoli: antociani (soprattutto cianidina-3-glucoside e cianidina-3-rutinoside), proantocianidine; fenolici minori (acidi vanillico, siringico, ferulico).
Carotenoidi e tocoferoli: carotenoidi e vitamina E (γ-tocoferolo) nelle frazioni lipidiche.
Frazione lipidica: profilo indicativo con oleico (MUFA — acidi grassi monoinsaturi; spesso positivo per stabilità ossidativa), palmitico (SFA — acidi grassi saturi; da bilanciare nella dieta) e linoleico (PUFA — acidi grassi polinsaturi; funzionali ma più sensibili all’ossidazione).
Fibre: contenuto rilevante di fibra nella polpa.
Minerali: calcio, magnesio, manganese, ferro (tenori variabili).
Marcatori analitici: TPC (Folin–Ciocalteu); antociani via HPLC (C3G, C3R); per l’olio profilo FA (GC-FID), perossidi e acidità libera.

Processo di produzione

Materie prime: selezione di racemi maturi; rimozione corpi estranei; raffreddamento rapido.
De-pulping: macerazione in acqua e separazione meccanica della polpa dal seme; regolazione del pH per stabilità del colore.
Stabilizzazione: pastorizzazione/HTST della purea; per polveri—liofilizzazione o spray-dry con veicoli idonei.
Estrazione: per estratti polifenolici, acqua/EtOH a temperatura controllata con eventuali resine a scambio; per l’olio, spremitura/centrifugazione della polpa e filtrazione.
Standardizzazione: titolazione in TPC/antociani (estratti idrofili) o specifiche dell’olio (acidità, perossidi, indice di iodio).
Controlli qualità: profilo HPLC degli antociani, solventi residui, metalli/pesticidi, microbiologia; confezionamento secondo GMP/HACCP.

Proprietà sensoriali e tecnologiche

Aroma/colore: note di frutta scura con accenni vinacei e cacao; tonalità porpora intensa in ambiente acido.
Funzionalità: attività antioxidant in vitro delle frazioni polifenoliche; l’olio conferisce corpo e lucidità in emulsioni.
Compatibilità: rischio di torbidità per complessi polifenolo–proteina o con ioni Ca/Mg; colore sensibile a luce/ossigeno (sbiadimento).

Impieghi alimentari

Bevande, smoothie e RTD, dessert congelati, lattiero-caseari, prodotti da forno e ripieni, confetteria, topping/salse; polvere liofilizzata per “acai bowl”. Dosaggi indicativi: polpa 5–20% in blend/semilavorati; polvere liofilizzata 1–5% in bevande/dessert; frazioni antocianiche come fonti di colore (E163) per il target cromatico.

Nutrizione e salute

Le frazioni di acai apportano polifenoli con attività antioxidant in vitro; in alimenti non si attribuiscono claim salutistici senza autorizzazione. L’olio, prevalente in MUFA (oleico), presenta un profilo tecnicamente favorevole alla stabilità ossidativa; la valutazione nutrizionale complessiva dipende dal contesto dietetico.

Qualità e specifiche (temi tipici)

Titolo in TPC e profilo HPLC degli antociani; assorbanza ~520 nm (colore).
Parametri chimico-fisici: pH, °Brix (polpa), umidità/aw (polveri).
Olio: acidità libera, numero di perossidi, profilo FA, indici di ossidazione.
Contaminanti: pesticidi/metalli entro limiti; microbiologia conforme; solventi residui ove applicabile.
Tracciabilità/igiene: conformità GMP/HACCP lungo la filiera.

Conservazione e shelf-life

Proteggere da luce e ossigeno (DO basso); imballi barriera a bassa permeabilità, atmosfera protettiva/inerte.
Polpa/puree: mantenere la catena del freddo; evitare cicli ripetuti di congelamento–scongelamento.
Polveri: controllare RH/aw per prevenire caking e perdita di colore/aroma.
Olio: possibile aggiunta di antiossidanti tecnici idonei; conservare al fresco e ben chiuso. Applicare rotazione FIFO.

Allergeni e sicurezza

L’acai non è tra gli allergeni maggiori; il rischio microbiologico si gestisce con igiene di raccolta e pastorizzazione. Verificare i requisiti di etichettatura (ad es. eventuale EtOH negli estratti).

Funzioni INCI in cosmesi

Voci tipiche: Euterpe Oleracea Fruit Extract; Euterpe Oleracea Pulp Powder; Euterpe Oleracea Fruit Oil.
Ruoli: antioxidant, skin conditioning, emolliente; l’olio apporta MUFA e PUFA utili per la fase lipidica e il tocco cosmetico.

Troubleshooting

Perdita di colore: pH elevato/ossigeno/luce → acidificare entro i limiti di prodotto, proteggere da luce/DO, impiegare antiossidanti adatti.
Torbidità/precipitati: complessi polifenolo–proteina/metalli → chiarifica, chelanti blandi, filtrazione fine.
Ossidazione dell’olio: aumento del numero di perossidi → migliorare barriera all’ossigeno, abbassare la temperatura di stoccaggio, aggiungere antiossidanti.
Variabilità lotto-lotto: origine, maturazione, processo → standardizzare su TPC/antociani o su specifiche dell’olio con tolleranze strette.

Sostenibilità e filiera

Raccolta in ecosistemi di várzea con attenzione a biodiversità e pratiche locali; valorizzazione dei sottoprodotti (noccioli/semi) per energia o biochar; gestione degli effluenti con target BOD/COD; imballaggi riciclabili e logistica a temperatura controllata.

Conclusione

Le bacche di acai combinano pigmenti antocianici, note fruttate scure e una frazione lipidica con MUFA: la performance applicativa dipende da qualità della materia prima, controllo di pH/ossigeno/temperatura e rigorosa standardizzazione analitica; con tali presidi si ottengono prodotti stabili, ripetibili ed efficaci dal punto di vista sensoriale.

Mini-glossario

EtOH — etanolo: co-solvente idroalcolico; rilevante per etichettatura se presente come residuo.
TPC — total phenolic content: contenuto fenolico totale (Folin–Ciocalteu), indicatore globale non specifico.
HPLC — high-performance liquid chromatography: analisi quantitativa di antociani e altri marcatori.
MUFA — acidi grassi monoinsaturi (es. oleico): in genere favorevoli a stabilità ossidativa e profilo lipidico.
PUFA — acidi grassi polinsaturi (es. linoleico): funzionali ma più suscettibili a ossidazione; richiedono protezione.
SFA — acidi grassi saturi (es. palmitico): stabilità ossidativa elevata; opportuno bilanciamento dietetico.
E163 — antociani: classe di coloranti alimentari di origine vegetale (UE).
DO — dissolved oxygen (ossigeno disciolto): ridurlo limita ossidazioni e sbiadimenti.
RH — umidità relativa: da controllare per la stabilità delle polveri.
aw — attività dell’acqua: quota di acqua “libera”, utile a prevedere stabilità e microbiologia.
GMP/HACCP — buone pratiche di produzione/analisi dei pericoli e punti critici di controllo.
BOD/COD — domanda biochimica/chimica di ossigeno: indicatori del carico organico degli effluenti.
FIFO — first in, first out: rotazione scorte che privilegia i lotti più vecchi.
GC-FID — gascromatografia con rivelatore a ionizzazione di fiamma: impiegata per il profilo degli acidi grassi.

Bibliografia__________________________________________________________________________

Interdonato L, Marino Y, Franco GA, Arangia A, D'Amico R, Siracusa R, Cordaro M, Impellizzeri D, Fusco R, Cuzzocrea S, Paola RD. Açai Berry Administration Promotes Wound Healing through Wnt/β-Catenin Pathway. Int J Mol Sci. 2023 Jan 3;24(1):834. doi: 10.3390/ijms24010834. PMID: 36614291; 

Abstract. Recently, wound healing has received increased attention from both a scientific and clinical point of view. It is characterized by an organized series of processes: angiogenesis, cell migration and proliferation, extracellular matrix production, and remodeling. Many of these processes are controlled by the Wnt pathway, which activates them. The aim of the study was to evaluate the molecular mechanism of açai berry administration in a mouse model of wound healing. CD1 male mice were used in this research. Two full-thickness excisional wounds (5 mm) were performed with a sterile biopsy punch on the dorsum to create two circular, full-thickness skin wounds on either side of the median line on the dorsum. Açai berry was administered by oral administration (500 mg/kg dissolved in saline) for 6 days after induction of the wound. Our study demonstrated that açai berry can modulate the Wnt pathway, reducing the expression of Wnt3a, the cysteine-rich domain of frizzled (FZ)8, and the accumulation of cytosolic and nuclear β-catenin. Moreover, açai berry reduced the levels of TNF-α and IL-18, which are target genes strictly downstream of the Wnt/β-catenin pathway. It also showed important anti-inflammatory activities by reducing the activation of the NF-κB pathway. Furthermore, Wnt can modulate the activity of growth factors, such as TGF-β, and VEGF, which are the basis of the wound-healing process. In conclusion, we can confirm that açai berry can modulate the activity of the Wnt/β-catenin pathway, as it is involved in the inflammatory process and in the activity of the growth factor implicated in wound healing.

Impellizzeri D, D'Amico R, Fusco R, Genovese T, Peritore AF, Gugliandolo E, Crupi R, Interdonato L, Di Paola D, Di Paola R, Cuzzocrea S, Siracusa R, Cordaro M. Açai Berry Mitigates Vascular Dementia-Induced Neuropathological Alterations Modulating Nrf-2/Beclin1 Pathways. Cells. 2022 Aug 22;11(16):2616. doi: 10.3390/cells11162616. 

Abstract. The second-most common cause of dementia is vascular dementia (VaD). The majority of VaD patients experience cognitive impairment, which is brought on by oxidative stress and changes in autophagic function, which ultimately result in neuronal impairment and death. In this study, we examine a novel method for reversing VaD-induced changes brought on by açai berry supplementation in a VaD mouse model. The purpose of this study was to examine the impact of açai berries on the molecular mechanisms underlying VaD in a mouse model of the disease that was created by repeated ischemia-reperfusion (IR) of the whole bilateral carotid artery. Here, we found that açai berry was able to reduce VaD-induced behavioral alteration, as well as hippocampal death, in CA1 and CA3 regions. These effects are probably due to the modulation of nuclear factor erythroid 2-related factor 2 (Nrf-2) and Beclin-1, suggesting a possible crosstalk between these molecular pathways. In conclusion, the protective effects of açai berry could be a good supplementation in the future for the management of vascular dementia.

Laurindo LF, Barbalho SM, Araújo AC, Guiguer EL, Mondal A, Bachtel G, Bishayee A. Açaí (Euterpe oleracea Mart.) in Health and Disease: A Critical Review. Nutrients. 2023 Feb 16;15(4):989. doi: 10.3390/nu15040989. 

Abstract. The açaí palm (Euterpe oleracea Mart.), a species belonging to the Arecaceae family, has been cultivated for thousands of years in tropical Central and South America as a multipurpose dietary plant. The recent introduction of açaí fruit and its nutritional and healing qualities to regions outside its origin has rapidly expanded global demand for açaí berry. The health-promoting and disease-preventing properties of this plant are attributed to numerous bioactive phenolic compounds present in the leaf, pulp, fruit, skin, and seeds. The purpose of this review is to present an up-to-date, comprehensive, and critical evaluation of the health benefits of açaí and its phytochemicals with a special focus on cellular and molecular mechanisms of action. In vitro and in vivo studies showed that açaí possesses antioxidant and anti-inflammatory properties and exerts cardioprotective, gastroprotective, hepatoprotective, neuroprotective, renoprotective, antilipidemic, antidiabetic, and antineoplastic activities. Moreover, clinical trials have suggested that açaí can protect against metabolic stress induced by oxidation, inflammation, vascular abnormalities, and physical exertion. Due to its medicinal properties and the absence of undesirable effects, açaí shows a promising future in health promotion and disease prevention, in addition to a vast economic potential in the food and cosmetic industries.

Shim HR, Lee JS, Nam HS, Lee HG. Nanoencapsulation of synergistic combinations of acai berry concentrate to improve antioxidant stability. Food Sci Biotechnol. 2016 Dec 31;25(6):1597-1603. doi: 10.1007/s10068-016-0246-9.

Abstract. The objectives of this study were to increase the antioxidant activity of acai berry concentrate (Acai) by combining it with various antioxidants to exploit synergistic effects and improve antioxidant stability by nanoencapsulation. Ascorbic acid and trolox were identified as synergistic antioxidants for Acai. The optimal mixing ratio of ascorbic acid (74.64 μg/mL) and trolox (47.88 μg/mL) for synergistic activity in both oxygen radical absorbance capacity (ORAC) and DPPH assays was 1.56:1. A mixture of Acai, ascorbic acid, and trolox at the optimum ratio was nanoencapsulated using chitosan and gum arabic. Nanoparticles exhibited homogenous dispersion with a 230 to 260 nm particle size. During storage, nanoparticles exhibited better antioxidant stability than non-nanoencapsulated antioxidants. These results suggest that mixing Acai with ascorbic acid and trolox or nanoencapsulating this mixture with chitosan and gum arabic are both effective techniques for improving antioxidant activities.

Sadowska-Krępa E, Kłapcińska B, Podgórski T, Szade B, Tyl K, Hadzik A. Effects of supplementation with acai (Euterpe oleracea Mart.) berry-based juice blend on the blood antioxidant defence capacity and lipid profile in junior hurdlers. A pilot study. Biol Sport. 2015 Jun;32(2):161-8. doi: 10.5604/20831862.1144419. 

Abstract. The purpose of this pilot study was to examine whether regular consumption of an acai berry-based juice blend would affect sprint performance and improve blood antioxidant status and lipid profile in junior athletes. Seven junior hurdlers (17.5±1.2 years) taking part in a pre-season conditioning camp were supplemented once a day, for six weeks, with 100 ml of the juice blend. At the start and the end of the camp the athletes performed a 300-m sprint running test on an outdoor track. Blood samples were taken before and immediately after the test and after 1 h of recovery. Blood antioxidant status was evaluated based on activities of antioxidant enzymes (superoxide dismutase [SOD], catalase [CAT], glutathione peroxidase [GSH-Px], glutathione reductase [GR]), concentrations of non-enzymatic antioxidants (reduced glutathione [GSH], uric acid), total plasma polyphenols, ferric reducing ability of plasma (FRAP), thiobarbituric acid reactive substances (TBARS) and activities of creatine kinase (CK) and lactate dehydrogenase (LDH) as muscle damage markers. In order to evaluate potential health benefits of the acai berry, the post-treatment changes in lipid profile parameters (triglycerides, cholesterol and its fractions) were analysed. Six weeks' consumption of acai berry-based juice blend had no effect on sprint performance, but it led to a marked increase in the total antioxidant capacity of plasma, attenuation of the exercise-induced muscle damage, and a substantial improvement of serum lipid profile. These findings strongly support the view of the health benefits of supplementation with the acai berry-based juice blend, mainly attributed to its high total polyphenol content and the related high in vivo antioxidant and hypocholesterolaemic activities of this supplement.

ALNasser MN, AlSaadi AM, Whitby A, Kim DH, Mellor IR, Carter WG. Acai Berry (Euterpe sp.) Extracts Are Neuroprotective against L-Glutamate-Induced Toxicity by Limiting Mitochondrial Dysfunction and Cellular Redox Stress. Life (Basel). 2023 Apr 15;13(4):1019. doi: 10.3390/life13041019. 

Abstract. Aberrant accumulation of the neurotransmitter L-glutamate (L-Glu) has been implicated as a mechanism of neurodegeneration, and the release of L-Glu after stroke onset leads to a toxicity cascade that results in neuronal death. The acai berry (Euterpe oleracea) is a potential dietary nutraceutical. The aim of this research was to investigate the neuroprotective effects of acai berry aqueous and ethanolic extracts to reduce the neurotoxicity to neuronal cells triggered by L-Glu application. L-Glu and acai berry effects on cell viability were quantified using 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and lactate dehydrogenase (LDH) assays, and effects on cellular bioenergetics were assessed via quantitation of the levels of cellular ATP, mitochondrial membrane potential (MMP), and production of reactive oxygen species (ROS) in neuroblastoma cells. Cell viability was also evaluated in human cortical neuronal progenitor cell culture after L-Glu or/and acai berry application. In isolated cells, activated currents using patch-clamping were employed to determine whether L-Glu neurotoxicity was mediated by ionotropic L-Glu-receptors (iGluRs). L-Glu caused a significant reduction in cell viability, ATP, and MMP levels and increased ROS production. The co-application of both acai berry extracts with L-Glu provided neuroprotection against L-Glu with sustained cell viability, decreased LDH production, restored ATP and MMP levels, and reduced ROS levels. Whole-cell patch-clamp recordings showed that L-Glu toxicity is not mediated by the activation of iGluRs in neuroblastoma cells. Fractionation and analysis of acai berry extracts with liquid chromatography-mass spectrometry identified several phytochemical antioxidants that may have provided neuroprotective effects. In summary, the acai berry contains nutraceuticals with antioxidant activity that may be a beneficial dietary component to limit pathological deficits triggered by excessive L-Glu accumulations.

de Moura RS, Resende ÂC. Cardiovascular and Metabolic Effects of Açaí, an Amazon Plant. J Cardiovasc Pharmacol. 2016 Jul;68(1):19-26. doi: 10.1097/FJC.0000000000000347. 

Abstract. Despite being used for a long time as food and beverage by Brazilian people who live on the Amazon bay, only in the beginning of this century, açaí berries have been the object of scientific research. Açaí berries are rich in polyphenols that probably explains its versatile pharmacological actions and huge consumption, not only in Brazil but also in Europe and United States. In this review, not all but some pharmacological aspects of açaí berries are analyzed. Chemical and pharmacological differences between extracts obtained from the skin and seed of açaí are considered. Polyphenols from the seed of açaí increase endothelial nitric oxide production leading to endothelium-dependent relaxation, reduce reactive oxygen species and regulate key targets associated with lipid metabolism in different conditions such as hypertension, renal failure, and metabolic syndrome. We review the novel mechanisms of actions of açaí on different targets which could trigger the health benefits of açaí such as antioxidant, vasodilator, antihypertensive, cardioprotector, renal protector, antidyslipidemic, antiobesity, and antidiabetic effects in cardiovascular and metabolic disturbances.