Daily Archives: June 29, 2020

Why lobsters and Crabs turn red on cooking……..

Popular Food

Lobsters and Crabs are the two Sea foods are mouthwatering and popular all over the world. So much so that fairs are held to celebrate the lobster.  One such festival is held in Rockland, Maine which is attended by thousands.

lobster

Cooking Chemistry

When cooked these creatures turn coppery red. Although it is not necessary to become a chemist to become chefs but cooking is a science where chemistry takes place at each step. Some chemicals break down to get converted into edible and easily digestible form. Similarly in many foods there are color changes when cooked which is also due to chemical modification of ingredients. Here also, chemistry is occurring.

Normal lobster is of muddy color when alive. But the final color is dependent on the amounts of a pigment called astaxanthin which is also the pigment responsible for the red color of carrots, pink of flamingos, salmon and crabs. This pigment is red in color when free. It’s chemical structure is given below.

Due to the ketone and alcohol groups this compound is very active chemically easily binds other chemicals like proteins. Pigment is a powerful antioxidant. Lobsters ingest it to keep stress of survival under control has been found be beneficial human beings.

What happens in the lobster is that this pigment binds to the proteins in its skin. Due to this binding, it is forced to change its geometric structure and gets twisted to fit in. Depending on the type of protein it bonds to, there’s either what’s called a bathochromic shift, which turns the pigment blue, or a hypsochromic shift, to yellow. When you’re looking at a lobster, you’re seeing light reflecting through different layers of free and bonded astaxanthin–a lot of colors mixed together, hence the muddy brown.

So the final color is a combination of many colors like red, blue and amount and type  of proteins present in the body of lobster and the age . The muddy color is good for camouflaging from the predator because it becomes indistinguishable from the muddy water.

When the lobster is cooked the proteins are denatured and release the astaxanthin pigment turning the cooked meat into coppery red.

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Last Days in Assam

Peculiar things happened with me as I made preparations for leaving Sibsagar on my transfer back to Mumbai.

A few days prior to my planned departure, the weather became very hot and humid as it becomes there during summer days. But on the day of my journey to airport at Dibrugarh, it began to rain and rained so much that it became a deluge. Without any respite, the rain was falling in solid sheets. Visibility became very poor. My flight was canceled on the scheduled day despite the fact that our luggage was boarded and boarding passes were issued. Such a thing never happened to me in my three years sojourn in Assam. My flight never got canceled and I made it to airport even on the days of ULFA bandh. It seemed that there were some scores remaining unsettled, as if I owed something to others and others to me, as if someone was waiting for me to see me and fulfill the unfulfilled desires. My colleagues advised me to stay put at some hotel for next day journey but I returned back. Luckily, one of my colleagues brought back the key of the house which I had surrendered that very day. I changed my flight altogether for next day.

Next day flight again arrived one hour late and I began to have doubts again. At last it took off for Guwahati on its way to Kolkata. On my adjacent seats-I was on window seat-were sitting two very pretty young girls who incidentally happened to belong to same place I was coming from and their parents worked in same company as I. They were going to Chennai, but worried about missing their connecting flight from Kolkata to Chennai due to delay in this flight. It turned out that they were having non-refundable tickets of different airlines. If everything went on time from Kolkata not only would they miss the flight but also lose the money. I tried to help them and luckily at Kolkata when they were waiting for luggage, inquiry at help counter of the airlines revealed that the flight as usual was delayed for an hour.

But I made to Kolkata with no hurry as my connecting flight to Mumbai was late in the evening with enough time remaining. Flight to Mumbai also was delayed and reached at midnight. My real nightmare started when I hired a taxi from outside. There is a great racket going on at Mumbai airport. Some taxi driver and accompanying person will board the taxi with you and take a just outside the airport where number of taxis are waiting. He will charge money from you as they pretend it be prepaid taxi and will ask you to shift to some waiting taxi and will give the driver very vague instructions about the destination and give him some share. After traveling about half the distance, the driver will ask for the spot where the passenger will drop but he will give the name of place nearby. As you will protest that I have to go to where I have to, he will say that the fellow who transferred you in my cab told me to drop you elsewhere and for going further he will again demand some more money. Really, Mumbai is going to dogs, it will go bust. It is the city whose cycle of decline has really well started. It has become a old vamp. Name any kind of maladies-physical as well as mental- you will find them in Mumbai.


Best of luck for this dying city. My lungs choked on pollution as I sucked so many pollutants in two hours as I have done in Assam in 3 years.