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An in vitro investigation of the initial ph and titratable acidity of a selection of fruit smoothies Suzanne M Blacker Stephen L Creanor Siobhan Creanor Dental Update 2024 38:9, 707-709.
Authors
Suzanne MBlacker
BDS, PhD, MFDS, RCSEd, AHEA, MDSci
Clinical Lecturer/Honorary Specialist Registrar in Restorative Dentistry, Level 9, Dundee Dental Hospital and School, Park Place, Dundee DD1 4SY
Professor of Oral Sciences and Director of Undergraduate Dental Studies, Peninsula Dental School, Peninsula College of Medicine and Dentistry, The University of Plymouth, Room C407, Portland Square, Plymouth PL4 8AA
Four commercially-available fruit smoothie drinks were assessed for both initial/baseline pH and titratable acidity. A commercially-available smooth orange juice drink was used as a positive control. Baseline pH and titratable acidity were measured by titrating each fruit smoothie with 0.5 mL increments of 1M sodium hydroxide (NaOH), and measuring the pH following the addition of each increment, until pH 7 and pH 10 were reached. Each of the fruit smoothies investigated demonstrated a low baseline pH and had relatively high titratable acidity. Owing to both their low pH and high titratable acidity, it would be advisable to limit the consumption of such fruit smoothies to meal times.
Clinical Relevance: Fruit smoothies, which are made from pure fruit blended with 100% fruit juice, are a relatively new addition to the soft drinks market. It is recommended that they be consumed through a straw, similar to the advice given for other acidic soft drinks.
Article
It has been claimed that fruit smoothies ‘are set to be the high street success story for the UK soft drinks industry over the next few years’.1
In the UK, consumption of shop-purchased fruit smoothies has risen dramatically, from 6 million litres in 20011 to 51 million litres in 2010, having peaked at 79 million litres in 20072 and in 2010 UK smoothie sales were worth £141 million.2 The true level of smoothie consumption is not known, however, as these figures exclude consumption of homemade drinks, as well as those bought from cafés, coffee shops and juice bars.
The increase in smoothie consumption has been in line with the UK Government's ‘five-a-day’ campaign which encourages the public to consume at least five portions of fruit and vegetables every day.3 Many individuals see the consumption of fruit smoothies as one means of achieving this target. One serving of fruit smoothie can be counted as up to two of the recommended ‘five-a-day’.3 Despite this campaign, the majority of adults and children are still not achieving this daily target. In 2007, fruit in the form of pure fruit juice accounted for an 11.6% share of the ‘5-a-day’ consumption in children, an 8% increase on the previous year.4 Of the 1180 million litres of fruit juice consumed in the UK in 2010, smoothie consumption accounted for around 5%.2
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