High methoxyl pectin from dragon fruit (Hylocereus polyrhizus) peel

Abstract

Pectin from different fractions of dragon fruit (Hylocereus polyrhizus) peel was extracted using 1% citric acid and the physico-chemical characteristics of the pectin were studied. The highest pectin yield (26.38% on dry weight basis) was obtained from fresh inner layer of the peel when extraction was carried out at temperature: 73 °C, time: 67 min, pH: 2.03, and sample to citric acid ratio: 1:4 (w/v). The pectin also demonstrated the highest degree of esterification (63.74%) when compared with pectin from other fractions of the dragon fruit peel investigated in this study. The calculated degree of esterification confirmed that the extracted pectin is a high methoxyl pectin. The molecular weight of the pectin determined using size exclusion chromatography was 0.88 × 105 Da. Monosaccharide composition determined using high performance liquid chromatography revealed that the pectin was predominantly constituted of galacturonic acid (39.11%), followed by moderate concentrations of mannose, rhamnose, galactose, glucose and minor amounts of xylose and arabinose. The pectin exhibited Newtonian behaviour at concentrations of 0.5% and 1.0%, and pseudoplastic behaviour at concentrations of 2.0% and 3.0%. Although the viscosity of the dragon fruit peel pectin was lower than that of commercial apple and citrus pectins, it can be used as a functional and health ingredient in low viscous foods and beverages.

Physicochemical properties of dragon fruit peel pectin and citrus peel pectin: a comparison

“…High methoxyl (HM) pectin is a pectin group with DE value more than 50% and low methoxyl (LM) pectin has a DE value of less than 50% (Mamet et al, 2017). The present finding seems to be consistent but slightly lower than reports of dragon fruit peel pectin DE range of 57 -63% (Tang et al, 2011;Adzahan et al, 2014;Tongkham et al, 2017). Possible causes for variation in DE values are the differences in growing environments, plant varieties and pectin extracting conditions (Tongkham et al, 2017).…”

“…The peel, considered waste from the processing of dragon fruit, is about 22% of the whole fruit . Such waste is also abundant, according to literatures, with beneficial compounds like flavonoids and pectin (Hashim, 2018) (Ismail et al, 2012;Muhammad et al, 2014). Dragon fruit peel consists mainly of pectin (10.79%), betacyanin pigments (150.46/ 100g db) and a total dietary fibre of up to 69.3% (Chia and Chong, 2015).…”

Dietary Fibers from Fruits and Vegetables and Their Health Benefits via Modulation of Gut Microbiota

“…In citrus fruits, the major monosaccharide of SDF from orange peel is galacturonic acid (38.3%) and glucose, while galacturonic acid and arabinose are the two most abundant monosaccharides in the peels of grapefruit, lemon, gonggan, and ponkan (Wang et al., ). Dragon‐fruit peel pectin comprises galacturonic acid predominantly (39.1%), as well as mannose and rhamnose (Muhammad, Zahari, Gannasin, Adzahan, & Bakar, ). Notably, galactose was the major monosaccharide of SDF extracted from by‐products of yellow and purple potato (Xie et al., ).…”

Aktivitas antioksidan ekstrak sulur buah naga putih (Hylocereus undatus) dengan metode DPPH dan Rancimat

“…Buah naga telah dikenal sebagai buah yang memiliki aktivitas antioksidan dengan senyawa utamanya adalah betalain (Thirugnanasambandham & Sivakumur 2015). Kulit buah naga mengandung pektin (Muhammad et al 2014) dan betasianin yang menentukan pigmen warna merah serta berpotensi sebagai antioksidan (Priatni & Pradita 2015). Bagian lain dari buah naga yang belum diteliti potensinya sebagai sumber antioksidan adalah sulur, sulur ini harus diatur jumlahnya melalui pemangkasan untuk menjaga tanaman tetap dalam kondisi ideal, tidak tercipta kondisi lembap dan pertanaman yang rapi (Octaviani 2012).…”