Rapid Field Assay for Pineapple Fruit Acidity

Abstract

The sugar-to-acid ratio of pineapple (Ananas comosus L.) contributes toward giving the fruit its unique flavor. This ratio is an important indicator of both commercial and organoleptic ripeness, and it is useful in determining a harvest date. Citric acid is the major acid in pineapple and usually is determined by titration to a specific pH endpoint, while sugars are determined as total soluble solids by refractometry. Both acid and sugar levels vary with the season in the year-round production cycle. Acid titration is slow and difficult to perform in the field. A digital acidity meter based upon diluted juice conductivity was evaluated for potential field use. The readings obtained from the meter varied with clone and fruit potassium concentration. The meter had utility for field use to evaluate fruit quality and harvest date. Because fruit potassium levels can vary between harvests, the meter should be recalibrated on a regular schedule to adjust for potential crop management and seasonal effects.

Physiochemical and Sensory Properties of a Turmeric, Ginger, and Pineapple Functional Beverage with Effects of Pulp Content

“…Ogori et al [29] reported a • Brix of 9.32 and TA of 0.84 for their 80P10T10G juice, which differed from our study's same composition formulations. However, the increase in the TSS and TA in pineapple juice may correlate with changes in the citric acid content, which can be influenced by variety, maturity, storage temperature, and post-harvest handling [30,31]. Mean values ± standard deviations followed by different letters within a column indicate significant differences using a Tukey's HSD test at α = 0.05.…”

Selection of F1 genotypes of pineapple and reaction to inoculation with a Fusarium guttiforme isolate

“…Ratio is an important measure for pineapple breeding, especially when the objective of the program is development of cultivars for the in natura market, that is, for consumption as fresh fruit. Ratio defines flesh flavor and serves as a useful indicator to determine the time of harvest (Paull et al 2020).…”

Application of atmospheric cold plasma for inactivation of foodborne enteric pathogens on raw and dry roasted pistachio kernels and in pineapple juice

“…Pineapple (Ananas comosus) is a popular tropical fruit that is characterized by its sweet and acidic flavor (Paull et al, 2020). Pineapple juice is a good source of copper, magnesium, vitamin B, potassium, hydroxycinnamic acids, especially manganese and vitamin C .…”