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Kalamata Olives vs. Black Olives Peter Adams/Getty Images When it comes to comparing kalamata olives and black olives, it’s important to note that kalamata olives are indeed a type of black olive.
The olives are often slit to decrease the processing time further. The long method involves slitting the olives and placing them in strong brine for up to three months to debitter them. Some polyphenol remains in the olives after processing, giving them a slightly bitter taste.
The olives, leaves, and olive pulp contain large amounts of hydroxytyrosol derivative oleuropein, more so than olive oil. [1] Unprocessed, green (unripe) olives contain between 4.3 and 116 mg of hydroxytyrosol per 100 g of olives, while unprocessed, black (ripe) olives contain up to 413.3 mg per 100 g. [ 7 ]
Olive fruit contains several types of polyphenols, mainly tyrosols, phenolic acids, flavonols and flavones, and for black olives, anthocyanins. The main bitter flavor of olives before curing results from oleuropein and its aglycone which total in content, respectively, 72 and 82 mg/100 g in black olives, and 56 and 59 mg/100 g in green olives ...
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Some tomatoes also have been modified genetically with transcription factors from snapdragons to produce high levels of anthocyanins in the fruits. [38] Anthocyanins also may be found in naturally ripened olives, [39] [40] and are partly responsible for the red and purple colors of some olives. [39]
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These are labeled as "ripe" green olives that have been cured. [11] The process involves lye-curing in an oxygenated solution, that takes approximately 24 hours instead of six to eight weeks, and treatment with ferrous gluconate that fixes the black color. The olives are then placed in cans in mild brine, then pressured and heat processed. [12]