"Gluconic" refers to something that is related to or contains the chemical compound called gluconate. This compound is formed by adding glucose (a type of sugar) to a certain acid. Full definition
The higher the value of gluconic acid compared to acetic acid the smoother the taste (less sharpness). (happyherbalist.com)
Y ’ all, I love my homemade honey face wash and its composition of gluconic acid and enzymes do amazing things — brighten skin, promote cell renewal, and balance pH to name a few — but it is not awesome at removing mascara. (mommypotamus.com)
While vinegar contain aectic acid Kombucha contains acetic as well as other acids such as gluconic acid which are all produced in the fermentation process. (nutritionfacts.org)