Long chain glycolipids useful to avoid perishing or microbial contamination of materials

A beverage comprising an additive to the beverage, said additive being in the form of one or more compounds, said beverage being selected from the group consisting of wine containing alcohol, a 100% fruit juice, other fruit containing beverages which provide the flavor of fruit juices and contain greater than 0% fruit juice but less than 100% fruit juice, artificial fruit-flavor beverages, malt beverages, green tea, red tea, rooibos tea, mate tea, honeybush tea, pu-erh tea, oolong tea, black tea, ice-tea, ready-to-drink tea, beer-lemonade mixes, and beer-cola mixes, and wherein each one of said one or more compounds is a compound of the formula I:

• wherein m is 3 to 5, n is 2 to 5, o is 0 or 1 and p is 3 to 17, with the proviso that the sum m+n+o+p is not less than 14;
• and
• R is a carbohydrate moiety bound via one of its carbon atoms to the O atom to which R is attached in formula I,
• where the moiety R carries at least one hydroxyl group esterified with isovaleric acid,
• where the compound is present in an open chain form or in the form of a lactone formed between
• in formula I and any free OH depicted in formula I or on R, or
• a physiologically acceptable salt of said compound, and/or an ester of said compound with a C1-10-alcohol.