Compositions and articles comprising complexes of 1-methylcycloproprene and alpha-cyclodextrin
Compositions comprising complexes of 1-methylcyclopropene and α-cyclodextrin, and articles including the composition, are provided. Methods for using the compositions and articles in delaying the maturation of fruits, vegetables, and plants are also provided.
1. An adhesive label comprising
(a) a substrate having a first surface and a second surface;
(b) a layer on the first surface consisting essentially of a hydrophilic composition, wherein the composition comprises:
(i) a complex of 1-methylcyclopropene and a-cyclodextrin; and
(ii) a polymer binder selected from the group consisting of polyvinylpyrrolidone and copolymers thereof, polyvinyl alcohol and copolymers thereof, polyvinyl acetate copolymers, and combinations thereof;
(c) at least one additional functional layer covering the layer on the first surface; and
(d) an adhesive provided on the second surface;
wherein the hydrophilic composition is capable of releasing the 1-methylcyclopropene in the form of a gas when exposed to moisture, and wherein the at least one additional functional layer changes the 1-methylcyclopropene release profile relative to what the 1-methylcyclopropene release profile would be in the absence of the layer.
2. The adhesive label of claim 1 , wherein the ratio of polymer binder to complex on a weight to weight basis is from about 2:1 to about 1:2.
3. The adhesive label of claim 1 , wherein the polymer binder has a molecular weight ranging from about 5,000 to about 15,000.
4. The adhesive label of claim 1 , wherein the polymer binder has a molecular weight of about 10,000.
5. The adhesive label of claim 1 , wherein the hydrophilic composition further comprises a hygroscopic agent.
6. The adhesive label of claim 5 , wherein the hygroscopic agent is selected from the group consisting of glycerol, glucose, and combinations thereof.
7. The adhesive label of claim 1 , wherein the hydrophilic composition further comprises a humidity-indicating dye.
8. The adhesive label of claim 1 , wherein the substrate comprises a paper substrate.
9. The adhesive label of claim 1 , wherein the substrate comprises cardboard.
10. The adhesive label of claim 1 , wherein the at least one additional functional layer comprises a barrier polymer, a hydrophilic material, a hydrophobic material, or a hygroscopic material.