It’s nice to buy ingredients, but have you ever had the experience of consuming all the vegetables and fruits while they were still fresh? Of course, it’s my fault for not being able to consume as planned, but I do wish vegetables lasted longer.
The other day, I discovered a “freshness preserving bag” that seems to fulfill such a wish. Apparently, just putting vegetables in this bag will keep them fresh longer than usual. I tested to see if it was true and how long it would last.
The ingredients used in the experiment are spinach and bananas. Divide one stock into 5 sub stocks and put them in the plastic bag and 4 types of freshness preservation bags that were included at the time of purchase. Since it would be a waste to damage the spinach to the point where it can’t be eaten, we compared the degree of damage to the spinach after 5 days and the banana after 7 days.
Now, I will report the results while introducing the details of each product.
“Oya stone” absorbs and permeates ethylene gas
 Kansai Paper Works “Ainaika”
The first product I would like to introduce is “Ainaika” from Kansai Paper Works. It is a bag that is kneaded with powder of porous stone “Oya stone”, and the holes are a mechanism that absorbs and permeates ethylene gas that promotes the growth of vegetables. In addition, since anti-fog treatment is applied, water droplets are less likely to adhere, suppressing the occurrence and growth of putrefactive bacteria. There are four sizes, S, M, L, and long size, and the M size I used this time was perfect for the spinach. Basically, it is disposable, but as a guideline, it can be washed and reused 2-3 times.
Three days after the start of storage, the spinach in the plastic bag at the time of purchase has already begun to discolor, but the one stored in “Aisaika” has no change. On the 5th day, the spinach stored in the plastic bag at the time of purchase became shinashina, but there was no change at all in the “Aisaika” storage. The freshness remained as it was.
If left unattended, the inside of a banana will ripen and black spots called sugar spots will appear on the skin. The bananas stored in the plastic bag at the time of purchase had many sugar spots, while the bananas stored in Aisaika had almost no sugar spots. What should be noted is the contents. The bananas stored normally are quite ripe, and some of the fruits have turned black, while the bananas stored in Aisaika do not change color at all and have a crisp texture. remained the same.
I was surprised that both the spinach and bananas preserved at Aisaika remained as fresh and crispy as when I bought them. I ate only one banana right after I bought it, but the banana stored at Aisaika for a week had almost the same texture as the banana I ate when I bought it.
Formulated with antibacterial agent ASK
 Strix Design “Freshness Preserving Plastic Bag”
This is Strix Design’s “Freshness Preserving Plastic Bag”. These polyethylene bags contain the antibacterial agent “ASK” used when transporting fruits and vegetables, and are designed to keep freshness by reducing ethylene gas and antibacterial effects. There are two sizes, M and L. The image is that the M size contains 4 tomatoes and the L size contains 1 lettuce. There is no mention of whether it can be used repeatedly, but I think that it is basically disposable and can only be used twice at most.
Since there was not much change on the 3rd day, I will omit the rest and report the results on the 5th day. On the fifth day, the result was that the spinach stored in the bag at the time of purchase was fine, and the “freshness-preserving plastic bag” storage was also becoming fine. There is no pain at the tip of the leaves, and the freshness remains somewhat, so although I can feel the effect of the “freshness-preserving plastic bag”, I have the impression that the freshness has fallen slightly compared to the other three products.
On the other hand, bananas give good results. There are some sugar spots in bananas in “freshness preserving plastic bags”, but they are fewer than in bananas stored normally. When I peeled the skin off, the contents were similar to freshly bought bananas.
It was a little less fresh than the other 3 products, but it was still in much better condition than when it was stored in the plastic bag when it was purchased. The cost per sheet is good, so you can use it on a daily basis without hesitation.
Suppresses the respiration of fruits and vegetables in low-oxygen/high-carbon dioxide conditions
 Holrix “Freshness Preserving Bag Vegfresh”
Holrix’s “Freshness Preserving Bag VegFresh” uses two types of films with different gas permeability. In this way, the oxygen and carbon dioxide inside the bag are controlled to create a low-oxygen and high-carbon dioxide state, which suppresses the respiration of vegetables. It also features a zipper on the top for a tight seal. There are two sizes, M and L. Also, if you wash it, you can use it repeatedly. There is no mention of the number of times, but it was an impression that it could be used at least 3 to 4 times.
It showed an amazing ability to retain freshness. Even after 5 days, the spinach was as fresh as when I bought it, and the leaf tips were soft and firm.
Almost no sugar spots appeared on bananas either. In particular, the warped part remains as beautiful yellow as it was when I bought it. There is almost no change in the contents.