Very interesting, about the reconstruction of the blend. I imagine they have enough for DNA sequencing and the like.
Food and drink are at the center of the whole "heroic" age of polar exploration. Roland Huntsford's books about the subject make this very clear, as do Evan Connell's essays. The cultural chauvinism which kept them from learning from the Inuit--Amundsen was a notable exception to this--and the un-anticipated limitations of preserved food in their time, particularly the earliest Industrial Age explorers like Franklin, did them in, literally.
Scurvy was the big threat. It had been known before Captain Cook in the 18th century that fresh food was sooner or later necessary, and that limes and other citrus foods were antiscorbutics--it's where the nickname "Limeys" comes from. But the mechanism, the existence of vitamins, was not known. Victorian Britons felt that their technology, canned food for instance, had solved the problem but it hadn't.
Malnutrition, either deficiency or downright poisoning, as in the celebrated Douglas-Mawson-dogs-liver story, was at the center of every arctic disaster in that age, and there were a lot of them.