Chemical Characterization of the Oil Separated by Mechanical Pressing from <i>Strychnos madagascariensis</i> Dried Fruit Pulp Flour

In Mozambique, rural communities produce flours from the dried pulp of <i>Strychnos madagascariensis</i> fruits. Owing to its high lipid content, the oil from this flour is frequently separated by pressing to be used as seasoning and medicine. Aiming to characterize this oil, flour sampl...

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Bibliographic Details
Main Authors: Sandra S. I. Chemane, Susana Casal, Rebeca Cruz, Teresa Pinho, Maida Khan, Olívia Pinho, Olga Viegas
Format: Article
Language:English
Published: MDPI AG 2022-02-01
Series:Foods
Subjects:
Online Access:https://www.mdpi.com/2304-8158/11/3/474
Description
Summary:In Mozambique, rural communities produce flours from the dried pulp of <i>Strychnos madagascariensis</i> fruits. Owing to its high lipid content, the oil from this flour is frequently separated by pressing to be used as seasoning and medicine. Aiming to characterize this oil, flour samples (<i>n</i> = 24), dried at two different temperatures (55 °C and 65 °C), were collected from four local communities, together with a control sample prepared in the lab (50 °C). The resulting oil was fluid at room temperature, deep orange, and characterized by a high content of oleic acid (62–63%), followed by palmitic (20%) and linoleic (7%). It contained considerable amounts of tocols (25–34 mg/100 g) and carotenoids (8–10 mg/100 g), as well as sterols (431 ± 10 mg/100 g) and triterpenic alcohols (823 ± 4 mg/100 g mg/100 g). The overall composition was highly consistent between origins and temperatures, with only small statistically significant differences (<i>p</i> < 0.05), mostly between the community dried flours and control group. However, its high free fatty acid content (22–25%) reveals intensive enzymatic hydrolysis during the drying/fermentation steps, whose extension can be reduced by optimizing its technological process. Its chemical profile supports some of its folklore uses, revealing that it can be a promising source of edible oil, with health and technological potential that is worth optimizing and exploring.
ISSN:2304-8158