');--grs:50px;--gtaos:105px;--gtaosi:-105px;--gtaof:210px;--gbes:calc(100% + 105px);--gbef:calc(100% + 210px);--gbet:translateX(-105px);--gbeti:translateX(105px);--vgc:repeat(12, 1fr);--gc1:repeat(12, 1fr);--gc2:repeat(6, 1fr);--gc3:repeat(4, 1fr);--gc3h:1/4;--gc4:repeat(3, 1fr);--gcm:8.333%;--gac:1fr;--gcw50:50%;--gc2tp:0 calc(var(--grs) * 2) 0 0;--gc2sw:var(--gbes);--gc2slpl:0 0 0 105px;--gc2srpf:0 105px 0 0;--gc2sof:1;--gc2sol:2;--gc50:4/span 6;--gc48a:1/5;--gc48b:5/-1;--gc84a:1/9;--gc84b:9/-1;--gc39a:1/4;--gc39b:4/-1;--gc93a:1/10;--gc93b:10/-1;--gc615a:1/7;--gc615b:8/-1;--gc516a:1/6;--gc516b:7/-1;--tppr:0;--bgp:42px;--s_cn:0;--s_ces:4px;--s_cest:4px 4px 0 0;--s_cesb:0 0 4px 4px;--s_cs:8px;--s_cm:12px;--s_cl:16px;--s_cls:16px 0 0 16px;--s_cle:0 16px 16px 0;--s_clt:16px 16px 0 0;--s_cel:28px;--s_celt:28px 28px 0 0;--s_cf:50%;--m_ds1:50ms;--m_ds2:100ms;--m_ds3:150ms;--m_ds4:200ms;--m_dm1:250ms;--m_dm2:300ms;--m_dm3:350ms;--m_dm4:400ms;--m_dl1:450ms;--m_dl2:500ms;--m_dl3:550ms;--m_dl4:600ms;--m_de1:700ms;--m_de2:800ms;--m_de3:900ms;--m_de4:1000ms;--m_el:0,0,1,1;--m_es:0.2,0,0,1;--m_esa:0.3,0,1,1;--m_esd:0,0,0,1;--m_ee:0.2,0,0,1;--m_eea:0.3,0,0.8,0.15;--m_eed:0.05,0.7,0.1,1;--m_elg:0.4,0,0.2,1;--m_elga:0.4,0,1,1;--m_elgd:0,0,0.2,1;--cc_w:255,255,255;--cc_b:0,0,0;--c_p:1,31,48;--c_op:255,255,255;--c_pc:203,230,253;--c_opc:1,31,48;--c_s:67,81,200;--c_os:255,255,255;--c_sc:223,224,255;--c_osc:0,9,101;--c_t:83,97,98;--c_ot:255,255,255;--c_tc:215,229,230;--c_otc:17,30,31;--c_e:179,38,30;--c_oe:255,255,255;--c_ec:249,222,220;--c_oec:65,14,11;--c_co:109,123,124;--c_b:255,255,255;--c_ob:17,30,32;--c_su:249,249,249;--c_osu:17,30,32;--c_suv:215,229,230;--c_osuv:60,73,74;--c_is:38,51,53;--c_iso:239,241,242;--c_ip:175,202,224;--c_sh:0,0,0;--c_st:1,31,48;--c_cov:187,201,202;--c_scr:0,0,0;--c_suchs:225,234,236;--c_such:231,239,241;--c_suc:245,245,245;--c_sucl:249,249,249;--c_scls:255,255,255;--c_sub:249,249,249;--c_sud:209,220,222}:root ::-webkit-scrollbar,:root ::-webkit-scrollbar-corner{background:0 0;width:9pt;height:9pt}:root ::-webkit-scrollbar-thumb{background:content-box rgb(var(--c_cov));border:2px solid transparent;border-radius:8px;color:rgb(var(--c_cov));min-height:3pc;min-width:3pc}:root ::-webkit-scrollbar-button{height:0;width:0}body,frameset{padding:0;margin:0;color:rgb(var(--c_ob));background:rgb(var(--c_b));font-family:var(--t_bmf);font-size:var(--t_bms);line-height:var(--t_bmlh);font-weight:var(--t_bmw);letter-spacing:var(--t_bmt)}body{--space_nav_top:0px;--space_nav_bottom:0px;--space_nav_left:0px;--space_nav_right:0px;--DIT:0px;--DFQ:visible;overflow-x:hidden;overflow-y:var(--DFQ)}footer,header{display:flex;justify-content:flex-start}score-pointer{z-index:11000}addium-header .main *,addium-menu-footer p,addium-menu-footer p *,score-text 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210px);--gbet:translateX(-105px);--gbeti:translateX(105px);--vgc:repeat(4, 1fr);--gc1:1fr;--gc2:1fr;--gc3:1fr;--gc3h:1/-1;--gc4:1fr 1fr;--gc5:1fr;--gcm:8.333%;--gac:auto;--gcw50:100%;--gc2tp:0;--gc2sw:100%;--gc2slpl:calc(var(--grs) / 2) 0;--gc2srpf:calc(var(--grs) / 2) 0;--gc2sof:2;--gc2sol:1;--gc50:1/-1;--gc48a:1/-1;--gc48b:1/-1;--gc84a:1/-1;--gc84b:1/-1;--gc39a:1/-1;--gc39b:1/-1;--gc93a:1/-1;--gc93b:1/-1;--gc615a:1/-1;--gc615b:1/-1;--gc516a:1/-1;--gc516b:1/-1;--bgp:18px}main{width:100%}addium-header score-form[type="0"] score-input-container.col-1,addium-header score-form[type="0"] score-input-container.col-2,addium-header score-form[type="0"] score-input-container.col-3,addium-header score-form[type="0"] score-input-container.col-4,addium-header score-form[type="0"] score-input-container.col-5,addium-header score-form[type="1"] score-input-container.col-1,addium-header score-form[type="1"] score-input-container.col-2,addium-header score-form[type="1"] 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var(--hmm));--h1mw:725px;view-transition-name:header;display:grid;grid-template-columns:var(--vgc);grid-column:1/-1;width:100%}addium-header.inverted,addium-header[type="0"],score-text.inverted{--cc_w:255,255,255;--cc_b:0,0,0;--c_p:223,224,255;--c_op:24,51,69;--c_pc:48,74,92;--c_opc:203,230,253;--c_s:189,194,255;--c_os:5,23,154;--c_sc:40,54,175;--c_osc:223,224,255;--c_t:187,201,202;--c_ot:38,51,52;--c_tc:60,73,74;--c_otc:215,229,230;--c_e:242,184,181;--c_oe:96,20,16;--c_ec:140,29,24;--c_oec:249,222,220;--c_co:133,147,148;--c_b:0,0,0;--c_ob:219,228,230;--c_su:8,21,24;--c_osu:219,228,230;--c_suv:60,73,74;--c_osuv:187,201,202;--c_is:219,228,230;--c_iso:38,51,53;--c_ip:72,97,117;--c_sh:0,0,0;--c_st:223,224,255;--c_cov:60,73,74;--c_scr:0,0,0;--c_suchs:42,55,57;--c_such:31,44,47;--c_suc:21,34,36;--c_sucl:17,30,32;--c_scls:4,16,18;--c_sub:46,59,62;--c_sud:8,21,24;--CF:var(--c_osu);--CF_variant:var(--c_osuv)}addium-header score-form{width:auto;max-width:450px;padding:28px 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La risposta si trova spesso nell'uso di umettanti. Che cos'è un umettante? Alcuni esempi comuni sono ingredienti come la glicerina, lo zucchero e diversi tipi di sali. Gli umettanti abbassano l'attività dell'acqua (aw) di un prodotto perché l'acqua si lega preferenzialmente ad essi. Ogni umettante ha una capacità unica di abbassare l'attività dell'acqua a seconda della sua composizione chimica.
La quantità o la concentrazione degli umettanti aggiunti determina la diminuzione dell'aw.
Come regola generale, più basso è il peso molecolare dell'umettante, più potente è la sua capacità di legare l'acqua. Ad esempio, uno zucchero semplice come il saccarosio è più efficace di un amido, le cui molecole di glucosio intrecciate limitano i siti di legame con l'acqua disponibili. Per questo motivo, fibre, gomme e cere non sono umettanti efficaci.
Quando si sceglie un umettante, è importante considerare gli effetti indesiderati. Ad esempio, quando nell'impasto dei biscotti sono presenti proteine, se si abbassa l'attività dell'acqua a 0,7 utilizzando uno zucchero riducente, si entra nell'intervallo ideale per le reazioni di imbrunimento di Maillard. La riduzione dell'attività dell'acqua mantiene l'impasto sicuro dal punto di vista microbico, ma il prodotto diventa marrone dopo poche ore.
Gli umettanti possono anche introdurre sapori indesiderati in un prodotto. La glicerina è un umettante vantaggioso perché è insapore, tranne che ad alte concentrazioni. Inoltre, è completamente miscibile in acqua e non precipita in forma solida quando l'attività dell'acqua del prodotto cambia. Il sale o lo zucchero possono essere problematici perché, oltre ad aggiungere sapore, formano solidi se la concentrazione raggiunge il punto di saturazione nel prodotto. Per affrontare queste diverse sfide, molti produttori utilizzano una combinazione di umettanti.
Gli sviluppatori di prodotti possono utilizzare i seguenti passaggi per capire quanto e quale tipo di umettante o combinazione di umettanti li aiuterà a raggiungere ilrisultato desiderato.
È possibile prevedere quanto un umettante modifichi l'attività idrica di un prodotto utilizzando l'equazione di Norrish o l'equazione di Grover. Queste equazioni hanno costanti e coefficienti scientificamente determinati che possono essere utilizzati per le previsioni. (Per maggiori dettagli sulla scienza, consultare l'elenco delle pubblicazioni pertinenti).
Il Moisture Analysis Toolkit è un programma software che contiene queste equazioni. Lo strumento di previsione utilizza i dati specifici del prodotto per prevedere la quantità di umettante o la combinazione di umettanti necessaria per ottenere l'attività dell'acqua desiderata. La Tabella 1 illustra il funzionamento dello strumento di previsione quando abbiamo aggiunto la glicerina allo sciroppo.
Formulazione | Attività dell'acqua prevista | Attività idrica effettiva |
---|---|---|
Normale | n/a | 0.8230 |
Con aggiunta di 0,193 g di glicerina | 0.80 | 0.819 |
Con l'aggiunta di 3,76 g di glicerina | 0.75 | 0.754 |
Con l'aggiunta di 5,96 g di glicerina | 0.70 | 0.706 |
Le equazioni di previsione dell'attività dell'acqua possono essere uno strumento molto potente nella formulazione. Per ulteriori informazioni su queste equazioni, contattare l'assistenza di AQUALAB.
In questo webinar di 30 minuti, gli scienziati alimentari Mary Galloway e Zachary Cartwright spiegano come ottenere risposte alle vostre domande sulla shelf life. Scoprite come:
-Risolvere problemi e reclami per scoprire perché la durata di conservazione termina prima del previsto.
-Prevedere l'impatto delle modifiche alle ricette sulla durata di conservazione
-Confrontare l'effetto di diverse opzioni di ingrediente
-Valutare se una specifica opzione di confezionamento vi aiuterà a raggiungere o a migliorare la shelf life
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Ledward, D. A. "Nuovi prodotti di carne ad umidità intermedia". In Properties of Water in Foods, a cura di D. Simatos e J. L. Multon, 447-463. Dordrecht: Springer Netherlands, 1985. Link all'articolo.
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Pomeranz, Yeshajahu. Proprietà funzionali dei componenti alimentari. Academic Press, 2012. Link all'articolo.
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L'attività dell'acqua è il parametro principale per la qualità e la sicurezza degli alimenti, in quanto controlla la crescita microbica, previene la formazione di grumi, determina la durata di conservazione e molto altro ancora.
I test di conservabilità completi possono essere eccessivi, richiedono tempo e sono costosi. Le misurazioni dell'attività dell'acqua offrono un metodo molto più semplice e conveniente. Ecco perché.
Abbiamo effettuato una serie di test sulle 12 migliori marche di carne secca. Scoprite come si confrontano i livelli di attività dell'acqua, il pH, il contenuto di umidità e le valutazioni di sovra e sottoconfezione.
Abbiamo preso 27 alimenti naturali a marchio pulito dal negozio di alimentari e li abbiamo sottoposti a una serie di test di umidità. Alcuni sono stati superati, altri no. Ecco cosa abbiamo scoperto.
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