Chemical Composition of Clarified Bayberry (Myrica rubraSieb.et Zucc.) Juice Sediment

Abstract

Clarified bayberry juice turned hazy upon storage at 25 degrees C for 6 months, and the chemical composition of centrifugally separated sediment was analyzed. Bayberry juice haze was mainly protein-tannin haze. The lyophilized sediment contained 20.4 +/- 4.3% of protein, 70.2 +/- 2.6% of total polyphenols, 7.2% of monosaccharides, and 6.7 +/- 0.6% of ash. Amino acid analyses and molecular weight distribution estimation indicated that bayberry proteins were haze-active proteins with a molecular weight less than 8 kDa. Gallic acid, quercetin hexoside, quercetin deoxyhexoside, and quercetin were found in the methanol-dissolved sample, while gallic acid, protocatechuic acid, cyanidin, ellagic acid, and quercetin were detected in the acid-hydrolyzed sample. Ellagic acid was the dominant individual phenolic (9.9 +/- 0.19 g/100 g dry weight, 55.3% of the total amount) in the sediment. Monosaccharides of rhamnose, arabinose, mannose, glucose, and galactose in the sediment were most probably the glycoside moieties of the anthocyanins, flavonols, and elllagitannins. Metal ions of calcium, magnesium, potassium, iron, and copper also indicated the heterogeneous characteristics of the sediment.

Apple juices processed by high hydrostatic pressure: Interaction between chitosan application and quality drift

“…Between the experimental periods, sorbitol contents, a polyalcohol resulting from glucose degradation, only varied significantly in T1, T2 and T4 (Table 3). Accordingly, a clear pattern of isomerization or hydrolysis could not be found for these sugars in juices added with chitosan (Table 3), which is an indication of a heterogeneous flocculation and removal of some soluble components during samples preparation (Fang et al, 2006), as well as a dissimilar oxidation kinetics during storage. Table 2.…”

Myrica rubra Fruit Drink Sub-Chronic Toxicity and Hepatoprotective Effect in Rats

“…MRD is known to contain high concentration of proanthocyanidins [1]. These are condensed tannin polymers composed of various flavan-3-ol catechin units.…”

“…Indeed, in a recent study, [7] revealed the ability of oligomeric proanthocyanidins to suppress SPEBP-2 [7] and to increase PPAR-α expression. Another possibility is that the proanthocyanidins and the various poly phenols present in MRD [1,2] may act to suppress fat absorption in the intestine. Previous studies revealed the inherent ability of proanthocyanidins to decrease hyperlipidemia in mouse model type 2 diabetes [9] and in streptozotocin-induced type 1 diabetes in rats [7].…”

“…Phytochemical investigations of the fruit juice revealed the presence of high concentrations of polyphenols and proanthocyanidins [1]. The latter are condensed tannins (polymers) composed of various flavan-3-ol or catechin units.…”

Some pharmacological actions of Myrica rubra part 1: Effect on experimentally-induced gastric ulcers, inflammation and haemorrhoids in rats

“…Phytochemical investigations of the fruit juice revealed the presence of high concentrations of polyphenols and proanthocyanidins (Fang et al, 2006). The latter are con-densed tannins (polymers) composed of various flavan-3-ol or catechin units.…”