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技術文章您現在的位置:首頁 > 技術文章 > 冠亞活度儀為您解析:水分高的樣品活度一定高嗎?
冠亞活度儀為您解析:水分高的樣品活度一定高嗎?
更新時間:2025-12-12   點擊次數:38次

 

水分高的樣品活度不一定高

關鍵原因

  1. 水分活度(aw)衡量的是樣品中 “自由水" 的含量,而非總水分。

  2. 樣品中的水分可能以 “結合水" 形式存在,結合水無法被微生物利用,也不貢獻活度。

  3. 總水分高但結合水占比高時,自由水少,水分活度依然會偏低。


舉例說明

  • 新鮮水果:總水分高,且多為自由水,水分活度通常較高(0.9 以上)。

  • 蜂蜜:總水分約 17%-18%(不算低),但糖分與水分緊密結合,水分活度僅 0.6 左右。

  • 干燥谷物:總水分低,水分活度也低;但如果谷物吸潮,總水分上升且多為自由水,活度才會顯著升高。

常見高水分樣品水分活度對比表

樣品類別總水分范圍(%)水分活度(aw)范圍關鍵說明
新鮮草莓 / 藍莓85–920.97–0.99自由水占比,易滋生微生物
新鮮蘋果 / 梨80–880.96–0.98糖分較低,自由水含量充足
生雞肉 / 豬肉70–750.96–0.98肌肉組織中自由水占主導
鮮牛奶85–880.97–0.98水分多為自由水,無強結合成分
新鮮菠菜 / 生菜90–950.98–0.99水分含量,幾乎全為自由水
熟米飯(常溫)60–650.95–0.97淀粉吸水后仍有大量自由水
豆腐(嫩)80–850.96–0.98蛋白質結合部分水分,仍有大量自由水
蜂蜜(高水分)17–180.55–0.65特例:總水分不算極低,但強結合水占比高

補充說明

  1. 表格中數據為常見樣品的典型范圍,受品種、成熟度、儲存條件影響會有波動。

  2. 高水分樣品的水分活度普遍較高(多≥0.95),但蜂蜜等含大量親水性成分的樣品是例外。

  3. 水分活度≥0.9 的樣品,微生物易繁殖,需注意冷藏或密封保鮮。

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產品介紹:

   深圳冠亞采用技術研發的水分活度儀,采用多種分析測試模式,采用7寸高分辨率的液晶大屏幕,全程觸控式操作模式,分析過程中,可實時展現樣品溫度、活度值曲線以及活度值、溫度等參數的數據變化,而且整個測試過程中全自動完成,分析完畢后,自動語音報警,儀器屏幕自動鎖定最終的數據,并同時存儲測試數據。無需人員看護、維護實驗過程。專用的微型打印機在實驗結束后,實時打印出檢測的有效數據,以便長久保存。也可在歷史記錄里面查看歷史測試記錄并打印。

   設備專業的設計,具有性能穩定,檢測精度高,測量時間短,操作簡便的特點。通過觸摸彩屏顯示,可設定屏幕背光亮度,實現了友好的人機交互界面。可開啟多個通道同時測量,測量或校正時間10分鐘左右,可根據被測物不同進行時間設定。校正周期長,無需頻繁校正。同時帶有打印輸出功能、曲線繪制功能以及上位機數據采集系統。能夠更方便的進行數據的記錄和采集,可供后期數據的比較與分析。

廠家:

深圳冠亞水分儀科技有限公司/深圳市冠亞技術科技有限公司

技術指標

1 活度測試范圍:0.000-1aw

2 分辨率:0.001AW

4 測試通道:1-4(可選,常規單通道),價格不同請咨詢銷售;

5 溫度分辨率:0.1℃

6 試樣品名稱:可編輯、輸入樣品名稱

7 測試模式:多種

8 屏幕亮度:可調整屏幕亮度

9 時間:可調整

10、安全功能操作員密碼/管理員密碼設置功能

11、雙重校準功能:飽和鹽溶液多點校準,根據室溫校準設備溫度

12、數據存儲:自動存儲

13、歷史記錄:可查看歷史記錄

14、語音播報:自帶

15、打印功能:微型打印機可隨時打印數據

17、測試界面顯示:樣品名稱、溫度曲線、活度曲線、溫度值、活度值、測試模式

18、恢復出廠設置:具備

19、工作環境溫度050℃ 濕度095%RH

20、供電電壓交流220V

21、外形尺寸280mm×226mm×120mm

公司簡介:

深圳市冠亞技術科技有限公司成立于2004年,注冊資金叁仟萬,是一家專業從事鹵素水分測定儀、微波水分儀、水分活度儀、紅外線水分儀與熱失重試驗機研制、開發、制造以及銷售的高新技術集團公司。集團公司從1998年開始投入并致力于精密設備的研發,目前擁有自主知識產權產品已達幾十項,同時擁有數10幾項知識產權證書,公司參與起草水分活度儀JJG(粵)052-2017計量檢定規程(于2018-02-01實施發布),并與吉林大學科技研究院聯合成立了水分儀研發中心。

深圳市冠亞技術科技有限公司參與起草發布的《水分活度儀JJG(粵)052-2017計量檢定規程》。冠亞水分儀作為國內的水分儀研發廠家,產品目前遍布高校政府、科研機構、學校、第三方檢測單位、企業集團、個體戶收購、國家儲備糧等,“產品質量好、服務專業及時""受到了廣大用戶的一直好評。

 

冠亞集團秉承“以質量求生存、以創新拓發展"的戰略精神理念,致力成為具影響力的精密設備制造企業。

集團發展歷程:

2004年冠亞在深圳成立

2009年長春分公司成立

2012年沈陽分公司成立

 

核心科技:自主品牌 深圳冠亞、中國制造、專業研發、 技術保障

運輸保證:優質EPE珍珠棉緩沖材料、牛皮瓦楞紙、設計的專用包裝確保儀器運輸中無損壞。

售后保證:儀器免費保修一年,終身維護 值得信賴

地址:深圳市南山區科技園科苑西工業區25棟1段3層。

如需了解更多冠亞水分儀的產品信息,請致電:深圳市冠亞技術科技有限公司

 

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深圳市冠亞技術科技有限公司

深圳市冠亞技術科技有限公司

地址:深圳市南山區科苑西工業園25棟1段三層

版權所有:深圳市冠亞技術科技有限公司  備案號:粵ICP備13045729號  總訪問量:807187  站點地圖  技術支持:化工儀器網  管理登陸

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