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After earlier research, a purified form of vitamin K, phylloquinone , was isolated from plants in 1939 and used to treat a nutritional deficiency characterized by decreased prothrombin levels.
‘Older people tend to have higher blood levels of phylloquinone ,’ explains Booth, ‘so we thought they might not respond to dietary increases as much as the younger group.’
The IUPAC-IUB Commission on Biochemical Nomenclature abbreviates phylloquinone as ‘K’ while menaquinone is abbreviated as ‘MK-n.’
The best-known member of the vitamin K family is phylloquinone , also known as phytonadione because of its relationship with photosynthesis.
‘People over age 65 consumed more phylloquinone than those in the 20 to 40 age bracket,’ she says.
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