Nadia et al. (2010) studied
the effect of acidity level (pH 3.0-5.0) on sensorial
quality of CSP. They found that the preferred level
of acidity for CSP is at pH 4.0, which was adjusted
using calamansi juice as the natural source of citric
acid. Foods with pH of 4.6 or below prevent bacterial
spore growth and require only low thermal treatments
to reduce microbial load, inactivate enzymes and
produce safe, shelf stable products, while retaining
the original organoleptic characteristics and nutritive
compounds of fresh food