Sunday, 8 May 2016
Silk Coating Can Keep Fruit Fresh Without Refrigeration
Your favourite strawberries and bananas can stay fresh for more than a week without refrigeration if they are coated in a thin, odourless, biocompatible silk solution, says a study.Silk's unique crystalline structure makes it one of nature's toughest materials. Fibroin, an insoluble protein found in silk, has a remarkable ability to stabilise and protect other materials while being fully biocompatible and biodegradable.For the study, the researchers dipped freshly picked strawberries in a solution of one percent silk fibroin protein.
The coating process was repeated up to four times.The silk fibroin-coated fruits were then treated for varying amounts of time with water vapour under vacuum (water annealed) to create varying percentages of crystalline beta-sheets in the coating.The strawberries were then stored at room temperature. Uncoated berries were compared over time with berries dipped in varying numbers of coats of silk that had been annealed for different periods of time.At seven days, the berries coated with the higher beta-sheet silk were still juicy and firm while the uncoated berries were dehydrated and discoloured. Tests showed that the silk coating prolonged the freshness of the fruits by slowing fruit respiration, extending fruit firmness and preventing decay."The beta-sheet content of the edible silk fibroin coatings made the strawberries less permeable to carbon dioxide and oxygen. We saw a statistically significant delay in the decay of the fruit," said senior study author Fiorenzo Omenetto, professor at Tufts University in Massachusetts, US.Similar experiments were performed on bananas, which, unlike strawberries, are able to ripen after they are harvested.The silk coating decreased the bananas' ripening rate compared with uncoated controls and added firmness to the fruit by preventing softening of the peel.The findings were published in the journal Scientific Reports.Half of the world's fruit and vegetable crops are lost during the food supply chain, due mostly to premature deterioration of these perishable foods, according to the Food and Agriculture Organisation (FAO) of the United Nations.
Monday, 2 May 2016
Summer Special: Smashing Drinks to Quench Your Thirst
Picture this: It's blazing hot outside, you head indoors and race towards the a.c remote. While still trying to get the machine on, you make a giant leap to your next best friend - the refrigerator.
The door is open and as the cool air touches your body, you give a sigh of relief - heaven is here! The very next moment a chilled bottle of cola is spotted. You quickly reach out to it and gulp it down.How many of us are not known to have lived this moment? Summer is that time of the year when chilled beverages are probably most endearing to us. Under hot and humid conditions, our body tends to get dehydrated leading to a constant need to consume fluids. It is important to understand that while our body seeks constant hydration, its source should be healthy. Various medical and health studies conducted in the past have signaled at the ill effects of processed drinks. Not only are these drinks high in calories but are also stripped off the nutritional content and are filled purely with refined sugar. One should always be on a lookout for natural ways to stay hydrated. Apart from increasing your water intake, you can also add fruits and veggies that have high water content - some of them would include citrus fruits, melons, cucumber, etcetera. Yogurt is also an excellent way to cool down when it's hot outside.



















