Estratto di agrumi - Recensione

Recensione

Al222 (25747 pt) • 02-Nov-2025 09:50

Estratto di agrumi (Citrus extract)

Descrizione

Preparazione ottenuta da parti edibili e/o bucce di agrumi (es. Citrus sinensis, C. limon, C. paradisi, C. reticulata), tramite estrazione acquosa/idroalcolica o glicerica/glicolica; disponibili anche frazioni standardizzate in bioflavonoidi e concentrati di oli essenziali deterpenati.
Profilo: aroma fresco agrumato, con possibili note dolci–floreali o amaricanti (peel-driven). Colore giallo paglierino–ambrato (liquidi) o polvere da bianco a giallo chiaro.

Valore calorico (per 100 g di prodotto)

Estratto idroalcolico: ~30–120 kcal/100 g (in funzione dei solidi e dell’EtOH residuo).
Estratto glicerico/glicolico: ~150–300 kcal/100 g.
Estratto secco standardizzato (polvere): ~200–380 kcal/100 g (dipende da vettori e grado di purezza).
Ai dosaggi d’uso alimentari l’apporto energetico è in genere modesto.

Principali sostanze contenute

Flavonoidi (flavanoni/bioflavonoidi): esperidina, narirutina, eriocitrina, naringina (specie nel pompelmo).
Acidi organici: citrico (prevalente), malico; modulano pH e percezione acida.
Limonoidi: limonina, nomilina (contributo amaricante).
Carotenoidi (tracce), Vitamina C variabile (sensibile a calore/ossigeno), pectine e polisaccaridi.
Componenti volatili dell’olio essenziale: d-limonene, linalolo, citral (nerale/geraniale); possibili furocumarine (es. bergaptene) in alcune specie/parti (bergamotto, pompelmo).
Marcatori analitici: tenore in flavanoni (HPLC), °Brix, pH, profilo GC–MS dei volatili, metalli/pesticidi entro limiti, microbiologia conforme.

Processo di produzione

Materie prime: frutti selezionati o sottoprodotti dell’industria del succo (peel upcycling).
Estrazione: acqua/EtOH a pH controllato; alternative glicerina/glicoli; impiego di enzimi (pectinasi) per liberare flavonoidi. Per le frazioni aromatiche: spremitura a freddo/steam-distillation e deterpenazione.
Chiarifica e concentrazione: filtrazioni, polishing selettivo (rimozione cere/terpeni), concentrazione a bassa T°, standardizzazione in bioflavonoidi o volatili.
Controlli qualità: profilo HPLC/GC–MS, residui di solvente, °Brix/pH, contaminanti; confezionamento in imballi barriera luce/O₂ secondo GMP/HACCP.

Proprietà sensoriali e tecnologiche

Aroma/colore: note agrumate vivaci; l’intensità dipende da specie, parte e processo.
Amaro/astringenza: da naringina/limonoidi (peel/pompelmo); gestibile via selezione della frazione o debittering.
Compatibilità: in bevande acide buona stabilità; in matrici neutre le pectine possono dare torbidità/precipitazioni. Volatili sensibili a ossigeno/luce.

Impieghi alimentari

Bevande (analcoliche, funzionali), sciroppi, confetteria, topping/salse, prodotti da forno, dessert, marinature per carni/pesci, cioccolato e gelati.
Dosaggi indicativi: 0,05–0,30% nei liquidi (da tarare su target aroma/colore e soglia di amaro).

Nutrizione e salute

Apporta flavonoidi e acidi organici con attività antiossidante in vitro; in ambito alimentare non si formulano indicazioni salutistiche senza autorizzazioni specifiche.
Pompelmo/bergamotto: talune frazioni possono contenere furocumarine; a uso alimentare tipico l’esposizione è bassa, ma è buona prassi selezionare frazioni a basso FC o FCF per cosmesi.

Qualità e specifiche (temi tipici)

Titolo in flavanoni (HPLC), °Brix, pH, colore (assorbanze/spettri), volatili caratteristici (GC–MS).
Residui di solvente entro limiti; metalli/pesticidi conformi; microbiologia: assenza di patogeni e bassi conteggi totali.
Stabilità a luce/O₂; tracciabilità completa secondo GMP/HACCP.

Conservazione e shelf-life

Conservare al fresco e al buio in contenitori barriera ben chiusi; minimizzare O₂ disciolto (DO) nei liquidi.
Polveri: controllare aw/RH per evitare caking; evitare cicli termici che degradano Vitamina C e volatili.
Applicare rotazione FIFO.

Allergeni e sicurezza

Gli agrumi non sono allergeni maggiori UE; possibili sensibilità individuali.
Per estratti da filiere del succo possono essere presenti solfiti in tracce: verificare etichettatura.
In cosmesi leave-on, preferire frazioni FCF (senza furocumarine) per ridurre il rischio di fototossicità.

Funzioni INCI in cosmesi

Voci tipiche: Citrus Aurantium Dulcis (Orange) Peel Extract, Citrus Limon (Lemon) Peel Extract, Citrus Reticulata (Tangerine) Peel Extract, Citrus Aurantium Bergamia (Bergamot) Fruit Oil/Extract (FCF).
Ruoli: fragrance, antioxidant, skin conditioning, masking. Per oli/frazioni non FCF, attenersi ai limiti d’uso fototossicità.

Troubleshooting

Amaro eccessivo: alta quota naringina/limonoidi → selezionare specie/frazioni meno amare, applicare debittering, abbassare dose.
Torbidità/precipitato: pectine/polisaccaridi → chiarifica, filtrazione fine, enzimi pectinolitici.
Perdita di aroma: ossigeno/luce/temperatura → usare antiossidanti idonei, pack barriera, headspace inerte.
Viraggi di colore: pH/ossidazioni → mantenere pH acido entro range, proteggere da O₂.

Sostenibilità e filiera

Upcycling di bucce e sottoprodotti; recupero energia e solventi; gestione effluenti verso target BOD/COD.
Imballaggi riciclabili/monomateriale e logistica a T controllata migliorano stabilità e impronta.
Adozione di GMP/HACCP e fornitori con pratiche agricole sostenibili.

Conclusione
L’estratto di agrumi combina freschezza aromatica, modulazione acida e componenti funzionali (flavanoni, limonoidi). La resa applicativa dipende da specie/parte, profilo di pH, gestione di amaro/torbidità e protezione da luce/ossigeno; con corretta standardizzazione si ottengono prodotti stabili e ripetibili.

Mini-glossario

°Brix — percentuale in massa di solidi solubili; misura densità/sostanze in soluzione.
pH — misura di acidità/alcalinità; governa stabilità e colore.
HPLC — high-performance liquid chromatography: quantifica flavanoni/marker degli estratti.
GC–MS — gas chromatography–mass spectrometry: profila i volatili (olio essenziale).
EtOH — etanolo: co-solvente degli estratti idroalcolici; da controllare come residuo.
FCF — furanocoumarin-free: frazione/olio priva di furocumarine per ridurre la fototossicità in cosmesi.
DO — dissolved oxygen: ossigeno disciolto; ridurlo limita ossidazioni e perdita di aroma.
aw — attività dell’acqua: quota di acqua “libera”; aw bassa → migliore stabilità delle polveri.
GMP/HACCP — good manufacturing practice / hazard analysis and critical control points: sistemi igienico-preventivi con CCP definiti.
CCP — critical control point: fase in cui un controllo previene/riduce un pericolo (es. pH, residui di solvente, sigillo).
BOD/COD — domanda biochimica/chimica di ossigeno: indicatori dell’impatto dei reflui di processo.
FIFO — first in, first out: rotazione lotti che privilegia l’uso dei più vecchi.

Bibliografia__________________________________________________________________________

Okeke MI, Okoli AS, Eze EN, Ekwume GC, Okosa EU, Iroegbu CU. Antibacterial activity of Citrus limonum fruit juice extract. Pak J Pharm Sci. 2015 Sep;28(5):1567-71.

Abstract. The fruit juice extract of Citrus limonum was investigated for antibacterial activity. The antibacterial activity of the extract on ten strains of bacteria was determined by both agar well diffusion and macro-broth dilution methods. The extract was variously bacteriostatic and bactericidal against Bacillussubtilis ATCC 6051, Staphylococcus aureus ATCC 12600, Escherichia coli ATCC 11775, Pseudomonas aeruginosa ATCC 10145 as well as locally isolated clinical strains of the above bacteria and Salmonella kintambo (Human: 13, 23: mt:-), Salmonella typhi and Proteus sp. The MICs ranged from 0.78 mg/ml to 50mg/ml; MBCs, 25.0mg/ml to >100mg/ml and MBC/MIC ratios 2.0 to >16.0. These results provide scientific justification for the medicinal use of Citrus limonum fruit juice by Nigerian herbalists in the treatment of diseases in which strains of the test organisms have been implicated as etiologic agents.

Wang GH, Huang CT, Huang HJ, Tang CH, Chung YC. Biological Activities of Citrus aurantium Leaf Extract by Optimized Ultrasound-Assisted Extraction. Molecules. 2023 Oct 24;28(21):7251. doi: 10.3390/molecules28217251.

Abstract. Several studies have explored the biological activities of Citrus aurantium flowers, fruits, and seeds, but the bioactivity of C. aurantium leaves, which are treated as waste, remains unclear. Thus, this study developed a pilot-scale ultrasonic-assisted extraction process using the Box-Behnken design (BBD) for the optimized extraction of active compounds from C. aurantium leaves, and their antityrosinase, antioxidant, antiaging, and antimicrobial activities were evaluated. Under optimal conditions in a 150× scaleup configuration (a 30 L ultrasonic machine) of a pilot plant, the total phenolic content was 69.09 mg gallic acid equivalent/g dry weight, which was slightly lower (3.17%) than the theoretical value. The half maximal inhibitory concentration of C. aurantium leaf extract (CALE) for 2,2-diphenyl-1-picrylhydrazyl-scavenging, 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)-scavenging, antityrosinase, anticollagenase, antielastase and anti-matrix metalloprotein-1 activities were 123.5, 58.5, 181.3, 196.4, 216.3, and 326.4 mg/L, respectively. Moreover, the minimal inhibitory concentrations for bacteria and fungi were 150-350 and 500 mg/L, respectively. In total, 17 active compounds were detected in CALE-with linalool, linalyl acetate, limonene, and α-terpineol having the highest concentrations. Finally, the overall transdermal absorption and permeation efficiency of CALE was 95.9%. In conclusion, our CALE demonstrated potential whitening, antioxidant, antiaging, and antimicrobial activities; it was also nontoxic and easily absorbed into the skin as well as inexpensive to produce. Therefore, it has potential applications in various industries.

Huang WY, Heo W, Jeong I, Kim MJ, Han BK, Shin EC, Kim YJ. Ameliorative Effect of Citrus junos Tanaka Waste (By-Product) Water Extract on Particulate Matter 10-Induced Lung Damage. Nutrients. 2022 May 28;14(11):2270. doi: 10.3390/nu14112270.

Abstract. Citrus junos Tanaka (CJ)-related products are well-accepted by consumers worldwide; thus, they generate huge amounts of waste (peel, pulp, and seed) through CJ processing. Although some CJ by-products (CJBs) are recycled, their use is limited owing to the limited understanding of their nutritional and economic value. The exposure to particulate matter (PM) increases the risk of respiratory diseases. In this study, we investigated the ameliorative effects of CJB extracts (100, 200 mg/kg/day, 7 days) on PM10-induced (10 mg/kg, intranasal, 6 h) lung damage in BALB/c mice. Cell type-specific signaling pathways are examined using the A549 (PM10, 200 μg/mL, 6 h) and RAW264.7 (LPS, 100 ng/mL, 6 h) cell lines. The CJB extracts significantly attenuated PM10-induced pulmonary damage and inflammatory cell infiltration in a mouse model. The essential protein markers in inflammatory signaling pathways, such as AKT, ERK, JNK, and NF-κB for PM10-induced phosphorylation, were dramatically reduced by CJB extract treatment in both the mouse and cell models. Furthermore, the CJB extracts reduced the production of reactive oxygen species and nitric oxide in a dose-dependent manner in the cells. Comprehensively, the CJB extracts were effective in reducing PM10-induced lung injuries by suppressing pulmonary inflammation, potentially due to their anti-inflammatory and antioxidant properties.

Schneider ACA, Batisti AP, Turnes BL, Martins TC, Lisboa MEM, Custódio KM, Zanco J, Wilson KSC, Heymanns AC, Kanis LA, Magnago RF, Martins DF, Piovezan AP. Anti-hyperalgesic properties of ethanolic crude extract from the peels of Citrus reticulata (Rutaceae). An Acad Bras Cienc. 2020;92(1):e20180793. doi: 10.1590/0001-3765202020180793.

Abstract. The therapeutic effects from Citrus reticulata on painful inflammatory ailments are associated to its flavonoids constituent and phytochemical studies with Citrus genus affirm that the peels have important amounts of it. These bioactive compounds have been a considerable therapeutic source and evaluate potential application of the peel extract is significant. This research aims to investigate the influence of ethanolic crude extract from the peels of Citrus reticulata and its possible mechanism of action in different animal models of pain. The extract reduced hyperalgesia in the second phase of formalin test (vehicle: 501.5 ± 40.0 s; C. reticulata extract 300 mg/kg: 161.8 ± 41.1 s), in the carrageenan model (vehicle at 4th h: 82.5 ± 9.6 %; C. reticulata extract 300 mg/kg at 4th h: 47.5 ± 6.5 %) and in Complete Freund's Adjuvant model (vehicle: 501.5 ± 40.0 s; C. reticulata extract 300 mg/kg: 161.8 ± 41.1 s). The possible contribution of opioidergic and adenosinergic systems in the anti-hyperalgesic effect of C. reticulata extract was observed after treatment, with non-selective antagonists for both systems, which produced reversal effects. In conclusion, these properties of C. reticulata extract suggest a potential therapeutic benefit in treating painful conditions.

Sorrenti V, Consoli V, Grosso S, Raffaele M, Amenta M, Ballistreri G, Fabroni S, Rapisarda P, Vanella L. Bioactive Compounds from Lemon (Citrus limon) Extract Overcome TNF-α-Induced Insulin Resistance in Cultured Adipocytes. Molecules. 2021 Jul 21;26(15):4411. doi: 10.3390/molecules26154411.

Abstract. The consumption of plant-based food is important for health promotion, especially regarding the prevention and management of chronic diseases such as diabetes. We investigated the effects of a lemon extract (LE), containing ≥20.0% total flavanones and ≥1.0% total hydroxycinnamic acids, on insulin signaling in murine 3T3-L1 adipocytes treated with TNF-α, which was used to mimic in vitro the insulin resistance condition that characterizes diabetes mellitus. Our results showed LE increased PPARγ, GLUT4 and DGAT-1 levels, demonstrating the potential of this lemon extract in the management of insulin resistance conditions associated with TNF-α pathway activation. LE treatment further decreased the release of interleukin 6 (IL-6) and restored triglyceride synthesis, which is the main feature of a healthy adipocyte.

Kaur S, Panesar PS, Chopra HK. Citrus processing by-products: an overlooked repository of bioactive compounds. Crit Rev Food Sci Nutr. 2023;63(1):67-86. doi: 10.1080/10408398.2021.1943647.

Abstract. Citrus fruits contain plethora of bioactive compounds stored in edible as well as inedible part. Since, citrus fruits are processed mainly for juice, the residues are disposed in wastelands, hence, plenty of nutritional potential goes in vain. But if utilized wisely, the bioactive phytochemicals in citrus by-products have the ability to revolutionize the functional food industry. In the present review, the composition of citrus by-products in terms of bioactive components and their health benefits has been reviewed. Various extraction techniques used to extract these bioactives has been discussed and a brief overview of purification and utilization of the extracted compounds, in food and nutraceutical industry is also presented. Bioactives in citrus by-products are higher than the peeled fruit, which can be extracted, isolated and incorporated into food systems for development of health foods. From the studies reviewed, it was observed that research reported on utilization of citrus by-products is limited to mainly research labs; proper scale-up process and its adequate research commercialization is the need of hour to transform these bioactives into economical functional ingredients.

Hosseinimehr SJ, Karami M. Citrus extract modulates genotoxicity induced by cyclophosphamide in mice bone marrow cells. J Pharm Pharmacol. 2005 Apr;57(4):505-9. doi: 10.1211/0022357055849.

Abstract. The protective effect of citrus extract was investigated by using the micronucleus assay for anticlastogenic activity in mouse bone marrow cells; liver glutathione (GSH) content was determined against toxicity induced by cyclophosphamide. Mice were orally (gavage) pretreated with solutions of citrus peel extract (Citrus aurantium var. amara) prepared at three different doses (100, 200 and 400 mg kg(-1;) body weight) for 7 consecutive days. Then mice were injected intraperitoneally on the seventh day with cyclophosphamide (50 mg kg(-1)) and after 24 h killed for the evaluation of micronucleated polychromatic erythrocytes (MnPCEs) in bone marrow cells. Non-protein thiol levels in liver were estimated in mice injected with citrus extract with or without cyclophosphamide treatment. Administration of citrus extract before cyclophosphamide treatment significantly reduced the frequency of MnPCEs in mice bone marrow compared with the group treated with cyclophosphamide alone (P<0.0001-0.05). Citrus extract at a dose of 400 mg kg(-1) reduced MnPCEs 2.8 fold against genotoxicity induced by cyclophosphamide. Administration of cyclophosphamide depleted the GSH level in liver. Citrus extract showed excellent scavenging effects on 1,1-diphenyl-2-picryl hydrazyl radical (DPPH) at a concentration of 1.6 mg mL(-1). Application of citrus extract 1 h before cyclophosphamide treatment allowed GSH content to reach the normal level. It appeared that citrus extract, particularly flavonoids constituents with antioxidative activity, may return the GSH level to normal in stress conditions and reduces genotoxicity induced by cyclophosphamide in bone marrow cells.