{"id":4685,"date":"2024-08-04T15:13:24","date_gmt":"2024-08-04T15:13:24","guid":{"rendered":"https:\/\/longchangextracts.com\/?p=4685"},"modified":"2024-08-04T15:13:24","modified_gmt":"2024-08-04T15:13:24","slug":"moisture-activity","status":"publish","type":"post","link":"https:\/\/longchangextracts.com\/da\/moisture-activity\/","title":{"rendered":"Ved du, hvor vigtig fugtaktiviteten er for holdbarheden?"},"content":{"rendered":"

Definition af fugtighedsaktivitet<\/strong><\/p>\n

Fugtaktivitet er en vigtig faktor for f\u00f8devarers holdbarhed, og vi skal tage h\u00f8jde for denne egenskab i udformningen af produktformuleringer. Fugtaktivitet p\u00e5virker i h\u00f8j grad f\u00f8devarers holdbarhed, s\u00e5 det er en n\u00f8dvendig overvejelse i forbindelse med kontrol af f\u00f8devarekonservering. S\u00e5 hvad er fugtaktivitet?<\/p>\n

Kort sagt: Fugtaktivitet henviser til fugttilstanden i en pr\u00f8ve, dvs. graden af vandbinding.<\/p>\n

Strengt taget er fugtaktiviteten Aw forholdet mellem det vanddamptryk P, som f\u00f8devaren udviser ved en bestemt temperatur, og det rene vanddamptryk Po ved samme temperatur, dvs. at Aw=P\/Po.<\/p>\n

Hvor let eller sv\u00e6rt det er at fjerne vand fra maden, h\u00e6nger sammen med den form, det har i maden, og Der findes faktisk to former for vand i f\u00f8devarer<\/strong>:
\n(1) Frit vand - denne del af vandet bevarer vandets fysiske egenskaber og kan fungere som dispergeringsmiddel og opl\u00f8sningsmiddel for kolloider.<\/p>\n

Det frieste vand er rent vand eller destilleret vand, og indholdet af frit vand i f\u00f8devarer kan m\u00e5les direkte ved hj\u00e6lp af t\u00f8rremetoden.<\/p>\n

(2) Bundet eller bundet vand - denne del af vandet er t\u00e6t bundet, s\u00e5som honning, vand i plante- og dyreceller, til stede i cellev\u00e6gge eller protoplasma og fast bundet til proteiner; kemisk bundet vand, s\u00e5som laktosemonohydrat, natriumdehydroacetat og s\u00e5 videre. Det er ikke muligt at m\u00e5le vandindholdet indeni ved t\u00f8rring.<\/p>\n

Data om produktets fugtighed og vandaktivitet kan give en vis vurdering, men der er ingen n\u00f8dvendig proportionalitet.<\/p>\n

Forholdet mellem vandaktivitet og mikroorganismer<\/strong><\/p>\n

Vand, der kan udnyttes af mikroorganismer, er frit vand.
\nDen t\u00e6tte binding af vand til andre ingredienser i f\u00f8devaren reducerer mikrobiel v\u00e6kst og kemiske reaktioner, der f\u00f8rer til nedbrydning og ford\u00e6rv. Vandaktivitet Aw er ogs\u00e5 en vigtig kvalitetsindikator for sensorisk evaluering, f.eks. h\u00e5rd eller bl\u00f8d, spr\u00f8d eller kl\u00e6brig og andre sensoriske egenskaber.<\/p>\n

En h\u00f8j vandaktivitet og en lav grad af vandbinding i f\u00f8devaren betyder, at der er mere vand til r\u00e5dighed for mikrobiel v\u00e6kst og reproduktion, og omvendt er der mindre vand til r\u00e5dighed for mikrobiel v\u00e6kst og reproduktion, hvilket h\u00e6mmer v\u00e6ksten af mikroorganismer. Dette er en af de vigtigste grunde til, at vandaktivitet kan p\u00e5virke f\u00f8devarers holdbarhed.<\/p>\n

Tabel 1 Omr\u00e5de for minimum Aw-v\u00e6rdier for v\u00e6kst af st\u00f8rre mikrobielle taxa i f\u00f8devarer<\/p>\n

\"\"<\/p>\n

Tabel 2 Omr\u00e5de for minimum Aw-v\u00e6rdier for v\u00e6kst af st\u00f8rre mikroorganismer i f\u00f8devarer<\/p>\n

\"\"<\/p>\n

F\u00f8devarer med en fugtighedsaktivitet p\u00e5 0,60 til 0,85 er mellemfugtige f\u00f8devarer, som ikke kr\u00e6ver k\u00f8ling for at kontrollere patogener, men har en begr\u00e6nset holdbarhed p\u00e5 grund af ford\u00e6rv for\u00e5rsaget prim\u00e6rt af g\u00e6r og skimmelsvampe. For det meste af fugtighedsaktiviteten p\u00e5 0,6 under f\u00f8devaren er der en l\u00e6ngere holdbarhed, der heller ikke beh\u00f8ver k\u00f8ling, disse f\u00f8devarer kaldes f\u00f8devarer med lav fugtighed.<\/p>\n

Tabel 3 Fugtaktivitet og mikrobiel v\u00e6kst i f\u00f8devarer<\/p>\n

\"\"<\/p>\n

Da fugtighedsaktiviteten har en betydelig indvirkning p\u00e5 mikroorganismer, er den ogs\u00e5 en meget vigtig rettesnor for vores daglige mikrobiologiske test, fordi de fleste arter af mikroorganismer har en minimumst\u00e6rskel for fugtighedsaktivitet for at kunne vokse og formere sig.<\/p>\n

Generelt er f\u00f8devarens fugtighedsaktivitet lavere end denne t\u00e6rskel, og mikroorganismerne i f\u00f8devaren vil have sv\u00e6rt ved at vokse. Og n\u00e5r vi kender denne t\u00e6rskel, kan vi ogs\u00e5 bed\u00f8mme den videnskabelige validitet af vores testresultater.<\/p>\n

Metoder til at reducere fugtaktivitet<\/strong><\/p>\n

1. Forl\u00e6ng opvarmningstiden. For eksempel vil bageriprodukter p\u00e5 grund af temperaturen i ovnen v\u00e6re forskellige, hvilket resulterer i, at produkter i bageprocessen i forskellige dele af fugtighedsaktiviteten har en stor forskel, stabiliteten af ovntemperaturen, f\u00f8devarens stabilitet til at spille en vigtig rolle.<\/p>\n

2. \u00d8ge det osmotiske tryk, generelt for metoden til at \u00f8ge sukkerniveauet. Siden oldtiden er sukker og salt den mest traditionelle og effektive konserveringsmetode, men med markedets eftersp\u00f8rgsel efter produkter med lavt sukkerindhold, hvilket resulterer i utilstr\u00e6kkeligt sukker, accelereres f\u00f8devaremikrobiel v\u00e6kst. Det er en meget effektiv metode til at \u00f8ge sukkerniveauet ved at bruge sukker med lav s\u00f8dme under de n\u00f8dvendige betingelser. Generelt h\u00e6mmes den mikrobielle v\u00e6kst ved sukkerkoncentrationer over 50%. Men nogle af g\u00e6r- og skimmelsvampenes permeabilitet i sukkerkoncentrationen p\u00e5 op til 70% eller mere kan stadig vokse.<\/p>\n

3. Sirup eller flydende sukkeralkohol til at erstatte en del af vandet. Mange sorter af sirup p\u00e5 markedet, hver sirupsmag, vandaktivitet, fysiske og kemiske egenskaber er meget forskellige, alt efter produktets smag, staten til at v\u00e6lge den rigtige sirup.<\/p>\n

4. For\u00f8g vandabsorberende stoffer som kolloid og modificeret stivelse i formlen for at l\u00e5se det frie vand op. Under foruds\u00e6tning af udf\u00f8relse i henhold til GB 2760 kan det gennem en rimelig kombination af et eller flere fortykningsmidler effektivt reducere vandaktiviteten, forbedre smagen, forbedre organisationen og bremse aldringsproblemet i nudelprodukterne.<\/p>\n

Bestemmelse af vandaktivitet<\/strong><\/p>\n

Ved en bestemt temperatur kan vandaktiviteten, der vises af mark\u00f8ren, afl\u00e6ses p\u00e5 instrumentets display ved hj\u00e6lp af sensoren i Aw-testeren i henhold til \u00e6ndringen af vandets damptryk i f\u00f8devaren.<\/p>\n

En lille advarsel: Instrumentet kan nogle gange v\u00e6re un\u00f8jagtigt, s\u00e5 husk at kalibrere maskinen ved hj\u00e6lp af standardreagenser.<\/p>\n

Konklusionen er, at vandaktivitet (Aw) er en meget vigtig hegnsfaktor, vi kan bed\u00f8mme produktets vandaktivitet for at bestemme risikoen for mikrobiel v\u00e6kst i l\u00f8bet af holdbarheden, s\u00e5 vi kan udvikle et rimeligt konserveringsprogram.<\/p>","protected":false},"excerpt":{"rendered":"

Definition of Moisture Activity Moisture activity is an important factor in the shelf life of food products, and we must take this characteristic into account in the design of product formulations. Moisture activity affects the shelf life of food products to a greater extent, so it is a necessary consideration in food preservation control. So, […]<\/p>","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[46],"tags":[],"yoast_head":"\nHow important is moisture activity to shelf life, do you know? - China Chemical Manufacturer<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/longchangextracts.com\/da\/moisture-activity\/\" \/>\n<meta property=\"og:locale\" content=\"da_DK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How important is moisture activity to shelf life, do you know? - China Chemical Manufacturer\" \/>\n<meta property=\"og:description\" content=\"Definition of Moisture Activity Moisture activity is an important factor in the shelf life of food products, and we must take this characteristic into account in the design of product formulations. 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