JP2021076782A - 鮮度ラベル用構造体及び鮮度ラベル - Google Patents
鮮度ラベル用構造体及び鮮度ラベル Download PDFInfo
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- JP2021076782A JP2021076782A JP2019205060A JP2019205060A JP2021076782A JP 2021076782 A JP2021076782 A JP 2021076782A JP 2019205060 A JP2019205060 A JP 2019205060A JP 2019205060 A JP2019205060 A JP 2019205060A JP 2021076782 A JP2021076782 A JP 2021076782A
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Abstract
【解決手段】実施形態によると、鮮度ラベル用構造体が提供される。鮮度ラベル用構造体は、基材と、蛍光体層とを含む。蛍光体層は、基材に固着された凝集誘起蛍光体を含む。
【選択図】図2
Description
(ここで、L1、L2、L3、L4は、互いに独立して、−CO2−又は−SO3−を表し、M1、M2、M3、M4は、互いに独立して、水素原子又はカチオンを表し、X、Y、Zは、互いに独立して、−O−、−NH−、又は−S−を表し、m、n、o、pは、互いに独立して、1〜6の整数を表す)、水素原子、ハロゲン原子、水酸基、ニトロ基、カルバモイル基、炭素数1〜6のアルキル基、炭素数1〜6のハロアルキル基、炭素数2〜6アルケニル基、炭素数3〜10のシクロアルキル基、炭素数1〜6のアルキルオキシ基、炭素数2〜6のアシル基、アミノ基、炭素数1〜6のアルキルアミノ基、炭素数6〜10のアリール基、及び炭素数5〜10のヘテロアリール基からなる群から選択され、かつ、R1、R2、R3、R4のうちの少なくとも2つは、互いに独立して、−L1M1、−(CH2)m−L2M2、−X−(CH2)n−L3M3、及び−Y−(CH2)o−Z−(CH2)p−L4M4(ここで、L1、L2、L3、L4、M1、M2、M3、M4、X、Y、Z、m、n、o、及びpは上記の通りである)からなる群から選択される。)
テトラフェニルエチレン誘導体の具体例としては、下記の構造式(5)、(7)、(9)、及び(10)に示す化合物をあげることができる。
先ず、有機溶媒に凝集誘起蛍光体3aを溶解させて、処理液を準備する。有機溶媒の種類は、凝集誘起蛍光体3aを溶解可能なものであればよく、蒸発温度が低いものが好ましい。有機溶媒としては、例えば、エタノールを用いる。処理液における凝集誘起蛍光体3aの濃度は、例えば、上記構造式(7)に示す化合物を用いた場合50μM(重量モル)以上1mM(重量モル)以下とする。
図3は、実施形態に係る鮮度ラベルの一例を概略的に示す上面図である。図3に示す鮮度ラベル10は、図1に示す鮮度ラベル用構造体1と、保持体4と、図示しない水とを含む。
TPE−COOH ⇔ TPE−COO− + H+ (II)
図3に示す鮮度ラベル10を、以下の方法で準備した。先ず、凝集誘起蛍光体3aをエタノールに溶解して、処理液を調製した。この処理液に基材2を浸漬させた後、基材2を処理液内から引き上げ、ガラス板上に設置して乾燥させた。凝集誘起蛍光体3aとしては、上記構造式(5)に示す化合物を用いた。基材2としては、円形状のガラス繊維フィルタを用いた。このようにして、図1に示す鮮度ラベル用構造体1を得た。鮮度ラベル用構造体1において、ガラス繊維の表面上に設けられた蛍光体層3をTEMで観察したところ、その厚みは20nmであった。UVランプで紫外線を照射しながら鮮度ラベル用構造体1を観察したところ、強い蛍光を発することを確認した。UVランプによって照射した紫外線の波長は365nmであった。また、この際の鮮度ラベル用構造体1を、デジタルカメラを用いて撮影し、デジタル画像データを記録した。
先ず、上記と同様の方法で、鮮度ラベルR1を製造した。この鮮度ラベルR1を酢酸水の蒸気を密閉した容器内に封入し、酢酸水の蒸気に十分な時間にわたって暴露して、図8に示す鮮度ラベル10Aを得た。以下、この鮮度ラベル10Aを鮮度ラベルR2と称する。酢酸水としては、20μLの酢酸と200μLの水との混合液を使用した。また、保湿のために、密閉容器内には1gの純水を収容させた。UVランプで紫外線を照射しながら鮮度ラベルR2を観察したところ、強い蛍光を発することを確認した。また、この際の鮮度ラベルR2を、デジタルカメラを用いて撮影し、デジタル画像データを記録した。
先ず、図5に示す包装食品20を準備した。食品P1としては、真あじを用いた。鮮度ラベル10としては、上記鮮度ラベルR2を用いた。この包装食品20を、25℃の環境下で保存し、下記表1に示す保存時間ごとに鮮度ラベルR2の蛍光強度及びK値を測定した。蛍光強度は、UVランプで紫外線を照射した際に得られた画像データを基に、画像処理ソフトを用いてRBGの階調値を算出し、その算術平均を求めることにより数値化した。また、K値は、真あじの一部を採取し、電気泳動法を利用して求めた。この結果を、図11に示す。電気泳動法では、QS-Solutioj社製の鮮度チェッカーを用いて測定した。
先ず、凝集誘起蛍光体を有機溶媒に溶解して、処理液を調製した。有機溶媒としては、ポリエチレングリコールジメチルエーテルとエタノールの混合液を用いた。この処理液に基材を浸漬させ、次いで、基材を処理液内から引き上げた後、エタノール分を乾燥させて、基材に溶媒としてほぼポリエチレングリコールジメチルのみを含む処理液を含浸させた。ポリエチレングリコールジメチルエーテルとしては、東邦化学工業製の商品名ハイソルブMPMを使用した。凝集誘起蛍光体としては、上記構造式(5)に示す化合物を用いた。基材としては、円形状のガラス繊維フィルタを用いた。このようにして、比較例に係る鮮度ラベルを得た。以下、この鮮度ラベルを鮮度ラベルR3と称する。UVランプで紫外線を照射しながら鮮度ラベルR3を観察したところ、ほぼ無蛍光であることを確認した。また、この際の鮮度ラベルR3を、デジタルカメラを用いて撮影し、デジタル画像データを記録した。
鮮度ラベルR2は、<2.トリメチルアミンを対象成分とした実施例>と同様の手順で酢酸水に暴露させて蛍光を発する状態を確認した後、トリメチルアミン水に暴露させた。また、鮮度ラベルR3もトリメチルアミン水に暴露させた。トリメチルアミン水の比較対象としては、純水のみをそれぞれ暴露させた。いずれの密閉容器内にも、保湿のための1gの純水を収容させた。酢酸水としては、20μLの酢酸と200μLの水との混合液を使用した。トリメチルアミン水としては、10μLのトリメチルアミン、30μLのエタノール、及び160μLの水を含む混合液を使用した。図12に結果を示す。
Claims (5)
- 基材と、前記基材に固着された凝集誘起蛍光体を含む蛍光体層とを含む鮮度ラベル用構造体。
- 前記蛍光体層は、水を含有することで消光する請求項1に記載の鮮度ラベル用構造体。
- 前記凝集誘起蛍光体は、下記一般式(I)で表されるテトラフェニルエチレン誘導体を含む請求項1又は2に記載の鮮度ラベル用構造体。
- 請求項1乃至3の何れか1項に記載の鮮度ラベル用構造体と、前記鮮度ラベル用構造体に担持された水とを含む鮮度ラベル。
- 前記鮮度ラベル用構造体に担持された酸を更に含む請求項4に記載の鮮度ラベル。
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