{"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\/hu\/nedvesseg-aktivitas\/","title":{"rendered":"Tudja, mennyire fontos a nedvess\u00e9gaktivit\u00e1s az eltarthat\u00f3s\u00e1g szempontj\u00e1b\u00f3l?"},"content":{"rendered":"

A nedvess\u00e9gaktivit\u00e1s meghat\u00e1roz\u00e1sa<\/strong><\/p>\n

A nedvess\u00e9gaktivit\u00e1s fontos t\u00e9nyez\u0151 az \u00e9lelmiszerek eltarthat\u00f3s\u00e1ga szempontj\u00e1b\u00f3l, \u00e9s ezt a tulajdons\u00e1got figyelembe kell venn\u00fcnk a term\u00e9kformul\u00e1k megtervez\u00e9sekor. A nedvess\u00e9gaktivit\u00e1s nagyobb m\u00e9rt\u00e9kben befoly\u00e1solja az \u00e9lelmiszerek eltarthat\u00f3s\u00e1gi idej\u00e9t, ez\u00e9rt az \u00e9lelmiszer-tart\u00f3s\u00edt\u00e1s ellen\u0151rz\u00e9s\u00e9n\u00e9l sz\u00fcks\u00e9ges figyelembe venni. Mi is az a nedvess\u00e9gaktivit\u00e1s?<\/p>\n

Egyszer\u0171en fogalmazva: a nedvess\u00e9gaktivit\u00e1s a minta nedvess\u00e9gtartalm\u00e1ra, azaz a v\u00edzmegk\u00f6t\u00e9s m\u00e9rt\u00e9k\u00e9re utal.<\/p>\n

Szigor\u00faan v\u00e9ve: az Aw nedvess\u00e9gaktivit\u00e1s az \u00e9lelmiszer \u00e1ltal egy bizonyos h\u0151m\u00e9rs\u00e9kleten mutatott P v\u00edzg\u0151znyom\u00e1s \u00e9s az ugyanezen a h\u0151m\u00e9rs\u00e9kleten m\u00e9rt Po tiszta v\u00edzg\u0151znyom\u00e1s ar\u00e1nya, azaz: Aw=P\/Po.<\/p>\n

A v\u00edz \u00e9lelmiszerb\u0151l val\u00f3 elt\u00e1vol\u00edt\u00e1s\u00e1nak k\u00f6nny\u0171 vagy neh\u00e9zs\u00e9ge \u00f6sszef\u00fcgg azzal, hogy milyen form\u00e1ban van jelen az \u00e9lelmiszerben, \u00e9s a v\u00edz val\u00f3j\u00e1ban k\u00e9tf\u00e9le form\u00e1ban van jelen az \u00e9lelmiszerekben.<\/strong>:
\n(1) Szabad v\u00edz - a v\u00edznek ez a r\u00e9sze fenntartja a v\u00edz fizikai tulajdons\u00e1gait, \u00e9s diszperg\u00e1l\u00f3szerk\u00e9nt \u00e9s old\u00f3szerk\u00e9nt m\u0171k\u00f6dhet a kolloidok sz\u00e1m\u00e1ra.<\/p>\n

A legszabadabb v\u00edz a tiszta v\u00edz vagy a desztill\u00e1lt v\u00edz, \u00e9s az \u00e9lelmiszer szabad v\u00edztartalma k\u00f6zvetlen\u00fcl m\u00e9rhet\u0151 a sz\u00e1r\u00edt\u00e1si m\u00f3dszerrel.<\/p>\n

(2) K\u00f6t\u00f6tt vagy k\u00f6t\u00f6tt v\u00edz - a v\u00edznek ez a r\u00e9sze szorosan k\u00f6t\u00f6tt, mint p\u00e9ld\u00e1ul a m\u00e9z, a n\u00f6v\u00e9nyi \u00e9s \u00e1llati sejtekben l\u00e9v\u0151 v\u00edz, amely a sejtfalakban vagy a protoplazm\u00e1ban van jelen, \u00e9s szil\u00e1rdan k\u00f6t\u0151dik a feh\u00e9rj\u00e9khez; k\u00e9miailag k\u00f6t\u00f6tt v\u00edz, mint p\u00e9ld\u00e1ul a lakt\u00f3z-monohidr\u00e1t, n\u00e1trium-dehidroacet\u00e1t \u00e9s \u00edgy tov\u00e1bb. A bels\u0151 v\u00edztartalom m\u00e9r\u00e9se sz\u00e1r\u00edt\u00e1ssal nem lehets\u00e9ges.<\/p>\n

A term\u00e9k nedvess\u00e9gtartalm\u00e1ra \u00e9s v\u00edzaktivit\u00e1s\u00e1ra vonatkoz\u00f3 adatok adhatnak n\u00e9mi t\u00e1mpontot, de nincs sz\u00fcks\u00e9gszer\u0171 ar\u00e1nyoss\u00e1g.<\/p>\n

A v\u00edz aktivit\u00e1sa \u00e9s a mikroorganizmusok k\u00f6z\u00f6tti kapcsolat<\/strong><\/p>\n

A mikroorganizmusok \u00e1ltal hasznos\u00edthat\u00f3 v\u00edz szabad v\u00edz.
\nA v\u00edz szoros k\u00f6t\u0151d\u00e9se az \u00e9lelmiszer m\u00e1s \u00f6sszetev\u0151ihez cs\u00f6kkenti a mikrob\u00e1k n\u00f6veked\u00e9s\u00e9t \u00e9s a boml\u00e1shoz \u00e9s roml\u00e1shoz vezet\u0151 k\u00e9miai reakci\u00f3kat. A v\u00edzaktivit\u00e1s Aw az \u00e9rz\u00e9kszervi \u00e9rt\u00e9kel\u00e9s fontos min\u0151s\u00e9gi mutat\u00f3ja is, mint p\u00e9ld\u00e1ul a kem\u00e9ny vagy puha, ropog\u00f3s vagy ragacsos \u00e9s egy\u00e9b \u00e9rz\u00e9kszervi tulajdons\u00e1gok.<\/p>\n

A magas v\u00edzaktivit\u00e1s \u00e9s az \u00e9lelmiszer alacsony fok\u00fa v\u00edzmegk\u00f6t\u00e9se azt jelenti, hogy t\u00f6bb v\u00edz \u00e1ll rendelkez\u00e9sre a mikrob\u00e1k n\u00f6veked\u00e9s\u00e9hez \u00e9s szaporod\u00e1s\u00e1hoz, \u00e9s ford\u00edtva, kevesebb v\u00edz \u00e1ll rendelkez\u00e9sre a mikrob\u00e1k n\u00f6veked\u00e9s\u00e9hez \u00e9s szaporod\u00e1s\u00e1hoz, ami g\u00e1tolja a mikroorganizmusok n\u00f6veked\u00e9s\u00e9t. Ez az egyik legfontosabb oka annak, hogy a v\u00edzaktivit\u00e1s befoly\u00e1solhatja az \u00e9lelmiszer eltarthat\u00f3s\u00e1g\u00e1t.<\/p>\n

t\u00e1bl\u00e1zat A f\u0151bb mikrobi\u00e1lis taxonok \u00e9lelmiszerekben t\u00f6rt\u00e9n\u0151 n\u00f6veked\u00e9s\u00e9re vonatkoz\u00f3 minim\u00e1lis Aw-\u00e9rt\u00e9kek tartom\u00e1nya<\/p>\n

\"\"<\/p>\n

t\u00e1bl\u00e1zat A f\u0151bb mikroorganizmusok \u00e9lelmiszerekben t\u00f6rt\u00e9n\u0151 n\u00f6veked\u00e9s\u00e9re vonatkoz\u00f3 minim\u00e1lis Aw-\u00e9rt\u00e9kek tartom\u00e1nya<\/p>\n

\"\"<\/p>\n

A 0,60 \u00e9s 0,85 k\u00f6z\u00f6tti nedvess\u00e9gaktivit\u00e1s\u00fa \u00e9lelmiszerek k\u00f6zepes nedvess\u00e9gtartalm\u00fa \u00e9lelmiszerek, amelyek nem ig\u00e9nyelnek h\u0171t\u00e9st a k\u00f3rokoz\u00f3k elleni v\u00e9dekez\u00e9shez, de korl\u00e1tozott eltarthat\u00f3s\u00e1g\u00faak az els\u0151sorban \u00e9leszt\u0151gomb\u00e1k \u00e9s pen\u00e9szgomb\u00e1k \u00e1ltal okozott roml\u00e1s miatt. A legt\u00f6bb 0,6 alatti nedvess\u00e9gaktivit\u00e1s\u00fa \u00e9lelmiszer eset\u00e9ben hosszabb az eltarthat\u00f3s\u00e1gi id\u0151, szint\u00e9n nem ig\u00e9nyel h\u0171t\u00e9st, ezeket az \u00e9lelmiszereket alacsony nedvess\u00e9gtartalm\u00fa \u00e9lelmiszereknek nevezik.<\/p>\n

t\u00e1bl\u00e1zat Nedvess\u00e9gaktivit\u00e1s \u00e9s mikrob\u00e1k n\u00f6veked\u00e9se \u00e9lelmiszerekben<\/p>\n

\"\"<\/p>\n

Mivel a nedvess\u00e9gaktivit\u00e1s jelent\u0151s hat\u00e1ssal van a mikroorganizmusokra, ez a napi mikrobiol\u00f3giai vizsg\u00e1latainkban is nagyon fontos ir\u00e1nyad\u00f3, mivel a legt\u00f6bb mikroorganizmusfajnak van egy minim\u00e1lis nedvess\u00e9gaktivit\u00e1si k\u00fcsz\u00f6b\u00e9rt\u00e9ke a n\u00f6veked\u00e9shez \u00e9s szaporod\u00e1shoz.<\/p>\n

\u00c1ltal\u00e1ban az \u00e9lelmiszer nedvess\u00e9gaktivit\u00e1sa alacsonyabb enn\u00e9l a k\u00fcsz\u00f6b\u00e9rt\u00e9kn\u00e9l, az \u00e9lelmiszerben l\u00e9v\u0151 mikroorganizmusok nehezen fognak n\u00f6vekedni. \u00c9s ha m\u00e1r ismerj\u00fck ezt a k\u00fcsz\u00f6b\u00e9rt\u00e9ket, meg tudjuk \u00edt\u00e9lni a vizsg\u00e1lati eredm\u00e9nyeink tudom\u00e1nyos \u00e9rv\u00e9nyess\u00e9g\u00e9t is.<\/p>\n

A nedvess\u00e9g aktivit\u00e1s\u00e1nak cs\u00f6kkent\u00e9s\u00e9re szolg\u00e1l\u00f3 m\u00f3dszerek<\/strong><\/p>\n

1. Hosszabb\u00edtsa meg a f\u0171t\u00e9si id\u0151t. P\u00e9ld\u00e1ul a s\u00fct\u0151ipari term\u00e9kek, mivel a h\u0151m\u00e9rs\u00e9klet a s\u00fct\u0151ben lesz k\u00fcl\u00f6nb\u00f6z\u0151, ami a term\u00e9kek a s\u00fct\u00e9si folyamat k\u00fcl\u00f6nb\u00f6z\u0151 r\u00e9szein a nedvess\u00e9g aktivit\u00e1s nagy k\u00fcl\u00f6nbs\u00e9g, a stabilit\u00e1s a s\u00fct\u0151 h\u0151m\u00e9rs\u00e9klet, a stabilit\u00e1s az \u00e9lelmiszer, hogy fontos szerepet j\u00e1tszanak.<\/p>\n

2. N\u00f6velje az ozmotikus nyom\u00e1st, \u00e1ltal\u00e1ban a cukorszint n\u00f6vel\u00e9s\u00e9nek m\u00f3dszer\u00e9re. Az \u00f3kor \u00f3ta a cukor \u00e9s a s\u00f3 a leghagyom\u00e1nyosabb \u00e9s leghat\u00e9konyabb tart\u00f3s\u00edt\u00e1si m\u00f3dszer, de az alacsony cukortartalm\u00fa term\u00e9kek ir\u00e1nti piaci kereslet, ami el\u00e9gtelen cukor, az \u00e9lelmiszer-mikrob\u00e1k n\u00f6veked\u00e9se felgyorsult. Nagyon hat\u00e9kony m\u00f3dszer a cukorszint n\u00f6vel\u00e9se alacsony \u00e9dess\u00e9g\u0171 cukor felhaszn\u00e1l\u00e1s\u00e1val, a sz\u00fcks\u00e9ges felt\u00e9telek mellett. \u00c1ltal\u00e1ban a mikrob\u00e1k n\u00f6veked\u00e9se 50% feletti cukorkoncentr\u00e1ci\u00f3n\u00e1l g\u00e1tolt. De n\u00e9h\u00e1ny \u00e9leszt\u0151 \u00e9s pen\u00e9szgomb\u00e1k \u00e1tereszt\u0151k\u00e9pess\u00e9ge, a cukorkoncentr\u00e1ci\u00f3 ak\u00e1r 70% vagy t\u00f6bb m\u00e9g mindig n\u00f6vekedhet.<\/p>\n

3. Szirup vagy foly\u00e9kony cukoralkohol a v\u00edz egy r\u00e9sz\u00e9nek helyettes\u00edt\u00e9s\u00e9re. Sok fajta szirup a piacon, minden szirup \u00edz, v\u00edz aktivit\u00e1s, fizikai \u00e9s k\u00e9miai tulajdons\u00e1gai nagyon k\u00fcl\u00f6nb\u00f6z\u0151ek, a term\u00e9k \u00edz\u00e9nek megfelel\u0151en, az \u00e1llam v\u00e1lasztani a megfelel\u0151 szirupot.<\/p>\n

4. N\u00f6velje a v\u00edzfelvev\u0151 anyagok, p\u00e9ld\u00e1ul a kolloid \u00e9s a m\u00f3dos\u00edtott kem\u00e9ny\u00edt\u0151 mennyis\u00e9g\u00e9t a t\u00e1pszerben a szabad v\u00edz megk\u00f6t\u00e9se \u00e9rdek\u00e9ben. A GB 2760 szerinti kivitelez\u00e9s el\u0151felt\u00e9telei szerint egy vagy t\u00f6bb s\u0171r\u00edt\u0151anyag \u00e9sszer\u0171 kombin\u00e1ci\u00f3j\u00e1val hat\u00e9konyan cs\u00f6kkenthet\u0151 a v\u00edzaktivit\u00e1s, fokozhat\u00f3 az \u00edz, jav\u00edthat\u00f3 a szervezetts\u00e9g \u00e9s lass\u00edthat\u00f3 a t\u00e9sztaterm\u00e9kek \u00f6reged\u00e9si probl\u00e9m\u00e1ja.<\/p>\n

A v\u00edzaktivit\u00e1s meghat\u00e1roz\u00e1sa<\/strong><\/p>\n

Egy bizonyos h\u0151m\u00e9rs\u00e9kleten az Aw-tesztel\u0151 k\u00e9sz\u00fcl\u00e9kben l\u00e9v\u0151 \u00e9rz\u00e9kel\u0151 seg\u00edts\u00e9g\u00e9vel az \u00e9lelmiszerben l\u00e9v\u0151 v\u00edz g\u0151znyom\u00e1s\u00e1nak v\u00e1ltoz\u00e1sa szerint a mutat\u00f3 \u00e1ltal mutatott v\u00edzaktivit\u00e1s leolvashat\u00f3 a m\u0171szer kijelz\u0151j\u00e9r\u0151l.<\/p>\n

Egy figyelmeztet\u00e9s: a m\u0171szer n\u00e9ha pontatlan lehet, ez\u00e9rt ne feledje, hogy a k\u00e9sz\u00fcl\u00e9ket szabv\u00e1nyos reagensekkel kalibr\u00e1lja.<\/p>\n

\u00d6sszefoglalva, a v\u00edzaktivit\u00e1s (Aw) nagyon fontos ker\u00edt\u00e9s t\u00e9nyez\u0151, meg\u00edt\u00e9lhetj\u00fck a term\u00e9k v\u00edzaktivit\u00e1s\u00e1t, hogy meghat\u00e1rozzuk a mikrobi\u00e1lis n\u00f6veked\u00e9s kock\u00e1zat\u00e1t az eltarthat\u00f3s\u00e1gi id\u0151 alatt, hogy \u00e9sszer\u0171 tart\u00f3s\u00edt\u00e1si programot dolgozzunk ki.<\/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\/hu\/nedvesseg-aktivitas\/\" \/>\n<meta property=\"og:locale\" content=\"hu_HU\" \/>\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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