Dry banana bread....why?
12 years ago
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- 12 years agolast modified: 11 years ago
- 12 years ago
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Banana varieties & winter dormancy issues
Comments (1)I don't have a good anwser for you(I usually leave mine in an unheated greenhouse in it's pot), but I did notice that the ones I cut or divided had a poorer survival rate, so part of the sikkimensis issue might have been from the cutting....See MoreAnyone tried freeze drying using dry ice?
Comments (17)First a little basic science -- from online sources: "At pressures less than 0.00604 atm, therefore, ice does not melt to a liquid as the temperature increases; the solid sublimes directly to water vapor. Sublimation of water at low temperature and pressure can be used to “freeze-dry” foods and beverages. The food or beverage is first cooled to subzero temperatures and placed in a container in which the pressure is maintained below 0.00604 atm. Then, as the temperature is increased, the water sublimes, leaving the dehydrated food (such as that used by backpackers or astronauts) or the powdered beverage (as with freeze-dried coffee)." The partial pressure of water vapor in the atmosphere is about 4.3 mm Hg at the freezing point. To evaporate, it has to barely exceed the atmospheric pressure of 760mm Hg. To do this, either reduce the pressure, or increase the temperature....or add other substances that can evaporate and contribute the rest of the pressure needed. This is where dry ice comes in. It will sublimate (i.e. -- go from solid to gas without first becoming liquid) at -78.5 C. A stream of CO2 flowing over a fixed source of ice will allow the water to sublimate. The key is to have the CO2 "flow." This is where a vacuum with discharge to atmosphere comes in, or a "sink" for the water, such as a dessicant. Clearly, a small blower will not come anywhere close to procucing a suitable low-pressure: It needs to be a pretty good vacuum. Even then, if the source of the CO2 is dry ice, you will need an awful lot of it. You can see why. Divide 760 mm Hg (total pressure) by 4.3 mm Hg and get the ratio 177:1. So if you have 0.1 lb-mole of water in the food (1.8 lb), you need 17,7 lb-mole of dry ice (779 lb). Alternatively, if you have a frost-free refrigerator, you can freeze the food and let the refrigerator do the rest. It will sweep atmospheric air over the food, drawing moisture from it in equilibrium with what is in the air. After a few MONTHS the water in the food will likely all sublime. If you have ever put a tray of water in the freezer, and left it, you would come back to find the tray empty, or mostly so. You can spend your money on freeze-dried foods made by someone else, you can run the refrigerator for months and pay the electric bill, you can buy dry ice and a decent vacuum pump (with other equipment), or you can do air drying or home canning. For emergency foods with long shelf-life and break-resistant containers, commercial freeze-dried foods are the way to go. For everything else, home canning and air drying is cost-effective and pretty healthful. As to the vitamins lost in processig, take supplements separately. By the way, these home vacuum sealers? Yes, they remove oxygen in the air that can otherwise react with food causing flavor and nutrient changes. They don't appreciably change the amount of water so if there are spoilage organisms (there usually are!) that can survive low temperatures in the absence of oxygen (anarobic bacteria), they will continue to grow. One "trick" I've taught is to take steel wool -- maybe a cigarette-sized twist -- and wrap it in a coffee filter. Put it in with the mostly dry food to be preserved, in a very tightly sealed container. The steel wool will react with the water and oxygen inside the container forming rust. The filter paper contains the rust particles so it doesn't mix with the food. As the water and oxygen react, the inside pressure drops. You can see this in a flexible container as it appears "squished." CO2 will not be removed, nor will nitogen or other fixed gases. Since all organisms appear to need SOME water, and that has been converted to hydrated iron oxide, this shouldn't be a problem...See MoreOrnamental Red Banana (Abyssinian banana, Ensete ventricosum)
Comments (22)I got a Red E Ventricosum banana late this spring. It did well in a pot getting quite large. About July I put it in the ground and did okay for awhile then started growing backwards (declining).. its pretty small right now..it really does dislike the hotter night temps as Eric (a previous poster) mentioned. I have grown both the green and red ones from seed in pots in S. Louisiana and they did quite well. They can get huge when they are happy. I'm going to put mine back in a pot again and see if it improves now that the nights are cooling off and it seems to be perking up a little. I think it takes the humidity better in a pot, based on my experiences. I also think they appreciate a little shade in the hottest part of the day here. I also grew these in AZ with basically no humidity and way above 100F temps during the summer they definitely hated that but survived with some shade and a misting system I had set up for my tropicals. My two Zebrina bananas are doing quite well, currently, in the ground and are beautiful. I've killed (or the winter, I should say, killed) 2 Siam Ruby bananas here but that was before I had my greenhouse techniques refined lol. ~Sjn...See MoreHow long can you keep saved frozen bananas for banana bread?
Comments (14)The food charts I have for how long you can keep bananas in the freezer gave no amounts of time, and one said "extended freezer time" - whatever that means (LOL). I guess the goal should be to use the frozen bananas in a timely manner (few months), but I was moving some things around in my refrigerator freezer and I found several ripe bargain bananas that were quick-frozen then placed in a FoodSaver bag, vacuum-sealed shut -- early last summer and promptly forgotten about. I made them into banana bread the other day for yet one more offering to the "throngs" for breakfast during their Christmas visit. When you vacuum-seal peeled bananas (or most food destined for freezer storage), they will last longer than in a typical storage bag because they are stored oxygen-free. Oxygen-free storage prevents the moisture inside the food from migrating from the surface of the food into the bag, drying out or creating ice crystals in the bag. A food science tidbit about using overly-ripe bananas for banana bread. When a banana bread recipe only calls for baking soda as the only chemical leavening, overly-ripe bananas are not as acid (6.5-7.0 pH) as a regular banana (4.6 pH) in order to react in partnership with the baking soda. The reaction may be a weak one resulting in a heavy banana bread. A good banana bread recipe, one that ensures adequate leavening, will use both baking powder and baking soda. If the recipe only has baking soda, make sure a portion of the bananas aren't overly-ripe, or there is another ingredient in the recipe that provides an acid ingredient. That could be some lemon juice added to the bananas to keep them from oxidizing and turning dark, orange juice, honey used as the sweetener, or yogurt, sour cream or buttermilk, which are all acid foods that will react with the baking soda. -Grainlady...See More- 12 years agolast modified: 11 years ago
- 12 years agolast modified: 11 years ago
- 12 years agolast modified: 11 years ago
- 12 years ago
- 12 years agolast modified: 11 years ago
- 12 years agolast modified: 11 years ago
- 12 years agolast modified: 11 years ago
- 12 years agolast modified: 11 years ago
- 12 years agolast modified: 11 years ago
- 12 years agolast modified: 11 years ago
- 12 years agolast modified: 11 years ago
- 12 years agolast modified: 11 years ago
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