Why wood rosins do the job

I don’t know absolutely everything about technology. Fact! Especially the chemical side with all those references to bonding and valency. I cover up this ignorance by asking questions:

QUESTION: I bought a bottle of Tango on a train and found myself reading the ingredients list on the label. What are emulsifiers, why are they necessary and why - in particular - are the exotically named glycerol esters of wood rosins used? I'd like to include your answer on my blog.

ANSWER: Cloudy, flavoured soft drinks, such as Tango Orange, often contain essential oils as part of the flavouring system. To ensure these oils remain evenly distributed throughout the drink, to give a uniform flavour over the consumption of the drink, it is necessary to use emulsifiers to allow these oils to be evenly dispersed throughout the product.

Glycerol esters of wood rosins, also known as ester gum, aid the emulsification of essential oils in products such as these. (They are) also odourless and tasteless at the levels used in soft drinks.

In Tango Orange using (these) rosins in conjunction with acacia gum (achieves) greater stability. Sharon Johnson, Britvic Consumer Care Advisor