TITLE …………………… 245 Journal homepage: www.fia.usv.ro/fiajournal Journal of Faculty of Food Engineering, Ştefan cel Mare University of Suceava, Romania Volume XIV, Issue 3 - 2015, pag. 245 - 249 SEPARATION AND QUANTIFICATION OF BIOGENIC AMINES IN BANANAS BY HIGH PERFORMANCE LIQUID CHROMATOGRAPHY *Veronica TANASA, Daniela MOISE, Maria STANCA Chemistry and Biochemistry Analysis Laboratory, Institute of Research and Development for Industrialization and Marketing of Horticultural Products - HORTING, 1A Intrarea Binelui, 4 District, Bucharest, Romania E-mail: vero.tanasa@yahoo.co.uk *Corresponding author Received July 13th 2015, accepted September 29th 2015 Abstract: This paper reports separation and quantification of biogenic amines in bananas by high performance liquid chromatography. Fresh and preserved samples (seven days of storage at refrigeration temperature, at room temperature respectively) were analyzed. We obtained the separation of all nine biogenic amines (tryptamine, 2-phenylethylamine, putrescine, cadaverine, histamine, serotonin, tyramine, spermidine, spermine) with good resolution, including good resolution of serotonin and internal standard (1,7diaminoheptane). Mean biogenic amines levels of 10.344 mg/kg (tryptamine) to 61.502 mg/kg (putrescine) were found in fresh bananas. After seven days of storage at room temperature, 2-phenylethylamine decreases significantly. After seven days of storage at refrigeration temperature, tryptamine increases significantly, whereas phenylethylamine decreases significantly. Keywords:2-phenylethylamine, bananas, biogenic amines, cadaverine, histamine, HPLC, putrescine, spermidine, spermine, serotonin, tryptamine, tyramine 1. Introduction Biogenic amines are natural low molecular weight organic bases of aliphatic, aromatic or heterocyclic structure derived from decarboxylation of the corresponding amino acids. Biogenic amines are present in small quantities in some products such as fruits, vegetables, milk etc. Polyamines such as putrescine, spermidine and spermine have been found in all higher plants and are involved in important physiological processes, such as fruit growth and development [1cited by 2]. Free biogenic amines in fruits and vegetables shape the typical and characteristic taste of mature foods and are precursors of certain aroma compounds [3 cited by 4]. Biogenic amines can be found in relatively large amounts in some fermented/ matured foodstuffs. Also biogenic amines can be used as indicators of quality and freshness, especially for animal raw material and food, as food spoilage is accompanied by increased content of biogenic amines. Biogenic amines exert physiological and toxicological effects. Some aromatic amines (tyramine, tryptamine, and 2- phenylethylamine) show a vasoconstrictor action while others (histamine and serotonin) present a vasodilator effect. Despite of low levels of biogenic amines in fruits, vegetables and fruit juices [5, 2, 6, 7 8], quantification of biogenic amines is important due to the existence of risk consumer categories. These include both patients treated with painkillers and drugs used for the treatment of stress and http://www.fia.usv.ro/fiajournal Food and Environment Safety - Journal of Faculty of Food Engineering, Ştefancel Mare University - Suceava Volume XIV, Issue 3 – 2015 Veronica TANASA, Daniela MOISE, Maria STANCA,Separation and cuantification of biogenic amines in bananas by High Performance Liquid Chromatography, Food and Environment Safety, Volume XIV, Issue 3 – 2015, pag. 245 – 249 246 depression, acting as a blocker of monoamine oxidase - the main route of biogenic amines detoxification [9], and young children and infants, as they are early feed with bananas, at 5 - 6 months of age. Through our research we aimed at the separation and quantification of biogenic amines in bananas by high performance liquid chromatography, since few data are reported about this topic [10, 11, 7, 12]. 2. Materials and methods 2.1. Samples Bananas were obtained from Romanian retail stores and were analyzed fresh and after preservation: seven days of storage at refrigeration temperature, respectively at room temperature. 2.2. Reagents and standards Tryptamine (Trp), 2-phenylethylamine (Phe), putrescine (Put) , cadaverine (Cad), histamine (His), serotonin (Ser), tyramine (Tyr), spermidine (Spd), spermine (Spm) and internal standard 1,7 diaminoheptane were purchased from Sigma-Aldrich. Stock solutions of biogenic amines and internal standard (1 mg/ml) were prepared, which were kept in the refrigerator for a month. These solutions were used for the preparation of standard solutions (100μg/ml) used for calibration curves. All other reagents used were p.a. grade and solvents were HPLC grade. 2.3. The analytical procedure has been adapted in the Chemistry and Biochemistry Laboratory of the HORTING Institute [13] following a previously published protocol [14]. In our case chromatographic separation was performed using a BDS Hypersil C18 column (250 * 4.6 mm), 5μ particle size (Thermo Electron Corporation). The mobile phase consisted of ammonium acetate 0.1 mol / l (solvent A) and acetonitrile (solvent B). We modified the gradient elution program proposed by Eerola et al. (1993) [14] (Table 1). The mobile phase flow rate was of 1ml/min and the column temperature was set at 400C. Dansylated derivatives of biogenic amines were UV detected at 254 nm. The control, data acquisition and processing software used ChromQuest 4.2. (ThermoFinnigan). The results were statistically processed with Student test using GraphPad Prism (version 5.00, GraphPad Software Inc., San Diego, 2007). The differences p <0.05 were considered significant. 3. Results and Discussion By modifying the gradient elution programme proposed by Eerola et al. (1993) [14] we found that resolution of serotonin and the internal standard was good (Fig. 1). Eerola et al. (1993) [14] asserted that the overlapping of serotonin and internal standard peaks did not interfere with the quantitation because the samples investigated contained no serotonin or only very small amounts. All biogenic amines investigated were present in fresh samples, but putrescine was predominant (Table 2). Kalac & Krausova (2005) [6] and Okamoto (1997) [5] reported that the putrescine content was predominant in grapefruit and apple, and orange respectively. Cirilio et al. (2003) [2] reported that the predominant amines in green coffee were serotonin and putrescine. Putrescine concentration in fresh samples (61.502 mg/kg) was comparable with the values reported by Kalac & Krausova (2005) [6] in grapefruit and fresh green pepper (62.1 respectively 70 mg/kg). Moret et al. (2005) [4] carried out a survey on free biogenic amine contents in fresh vegetable products and reported that putrescine was one of the most represented amines. Adao & et al. (2005) [11] found a putrescine content around 0.75mg/100g in bananas. Food and Environment Safety - Journal of Faculty of Food Engineering, Ştefancel Mare University - Suceava Volume XIV, Issue 3 – 2015 Veronica TANASA, Daniela MOISE, Maria STANCA,Separation and cuantification of biogenic amines in bananas by High Performance Liquid Chromatography, Food and Environment Safety, Volume XIV, Issue 3 – 2015, pag. 245 – 249 247 Fig. 1. Chromatographic separation of dansyl derivatives of biogenic amines (2 μg/ml) by gradient elution Fig. 2. Chromatogram of biogenic amines extracted from bananas after 7 days of storage at room temperature Minutes 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 m A U -250 0 250 500 750 1000 1250 1500 1750 2000 2250 m A U -250 0 250 500 750 1000 1250 1500 1750 2000 2250 T ri p ta m in a 8 .3 2 0 1 1 0 2 8 9 0 F en il et il a m in a 1 0 .8 6 2 1 4 4 0 7 3 7 P u tr es ce in a 1 2 .3 4 8 3 8 6 8 3 6 7 C a d a v er in a 1 4 .3 3 5 3 3 2 9 0 0 8 H is ta m in a 1 5 .5 4 7 3 3 8 8 4 5 9 2 0 .0 9 2 7 1 0 4 5 1 ,7 D ia m in o h ep ta n 2 1 .0 7 3 1 1 5 7 6 5 3 S er o to n in a 2 1 .7 5 8 1 7 0 4 7 8 0 T ir a m in a 2 5 .2 6 8 2 4 2 7 5 2 1 2 5 .7 9 8 1 9 6 2 1S p er m id in a 2 6 .3 8 0 3 0 1 4 6 8 7 2 6 .6 2 0 1 7 3 2 5 2 8 .6 7 8 3 1 4 8 0S p er m in a 2 8 .9 8 5 2 1 7 7 9 3 8 2 9 .4 1 3 1 3 9 6 9 PDA Plus-254nm Name Retention Time Area Minutes 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 m A U 0 500 1000 1500 2000 2500 3000 m A U 0 500 1000 1500 2000 2500 3000 7 .2 4 5 1 4 3 1 5 T r ip ta m in a 7 .6 4 2 4 0 6 9 3 9 .3 5 8 2 9 9 7 9 .7 9 2 2 2 5 7 4 F e n il e ti la m in a 1 0 .1 6 5 8 0 6 7 5 P u tr e sc e in a 1 0 .9 7 3 1 1 0 7 8 6 3 1 1 .7 6 0 1 0 0 3 3 7 1 2 .0 9 0 6 5 1 1 3 C a d a v e r in a 1 2 .9 6 3 3 0 4 9 2 0 H is ta m in a 1 3 .8 1 2 3 0 6 5 2 2 1 4 .3 1 0 4 7 6 4 9 7 1 ,7 D ia m in o h e p ta n 1 8 .6 7 8 7 7 6 1 0 0 S e r o to n in a 1 9 .5 4 7 4 5 5 2 8 5 2 0 .8 7 3 4 6 3 4 2 1 .6 7 0 5 8 4 1 0 2 2 .8 0 3 5 7 5 8 1 2 3 .3 3 2 3 1 8 1 9 3 T ir a m in a 2 4 .0 2 5 1 0 7 4 7 9 2 4 .4 7 2 2 5 1 4 2 5 .0 9 5 3 1 2 5 6 6 S p e r m id in a 2 5 .6 4 7 2 2 7 6 3 4 2 5 .8 9 0 3 6 3 9 6 2 6 .6 1 5 2 6 0 7 3 6 2 7 .1 1 8 8 1 5 9 4 2 7 .9 3 0 1 6 2 5 7 1 1 2 8 .3 5 0 2 1 5 6 5 5 S p e r m in a 2 8 .7 2 3 4 7 7 0 1 2 9 .0 3 3 2 0 0 2 3 9 2 9 .2 6 8 4 1 0 3 6 9 2 9 .7 3 7 7 1 6 6 PDA Plus-254nm Name Retention Time Area Food and Environment Safety - Journal of Faculty of Food Engineering, Ştefancel Mare University - Suceava Volume XIV, Issue 3 – 2015 Veronica TANASA, Daniela MOISE, Maria STANCA,Separation and cuantification of biogenic amines in bananas by High Performance Liquid Chromatography, Food and Environment Safety, Volume XIV, Issue 3 – 2015, pag. 245 – 249 248 Table 1. Gradient elution programme for the separation of biogenic amines in bananas Table 2. Mean biogenic amines levels (mg/kg) in bananas Trp Phe Put Cad His Ser Tyr Spd Spm Fresh samples 10.344 ±0.346 39.42 ±6.091 61.502 ±16.91 32.313 ±4.455 17.991 ±8.71 25.379 ±5.664 14.831 ±0.839 23.303 ±1.199 19.164 ±3.218 Samples preserved 7 days at room temperature 13.759 ±5.652 12.595 ±5.464 p<0.05 51.381 ±27.605 24.784 ±10.268 25.271 ±7.355 25.265 ±19.756 11.537 ±7.567 18.154 ±8.125 6.084 ±3.486 Samples preserved 7 days at refrigeration temperature 17.971 ±1.126 p<0.05 14.300 ±2.621 p<0.05 57.082 ±16.214 29.859 ±1.199 28.053 ±1.352 21.663 ±4.966 13.978 ±0.207 22.436 ±5.418 9.104 ±5.430 Histamine (17.991 mg/kg) was detected in fresh samples. The presence of histamine was not detected in bananas by Lavizzari et al. (2006) [7], but G.G. Mohamed et al. (2009) [12] reported histamine levels of 0– 33.10 mg/100g in seven banana samples. The tiramine concentrations in fresh samples (14.831 mg/kg) were in agreement with those values obtained by Udenfriend et al. (1959) [10] in bananas (0.7 mg/100g). We detected tryptamine, 2- phenylethylamine, cadaverine in fresh samples, but these biogenic amines have not been detected in bananas by Lavizzari et al. (2006) [7]. Mean serotonin levels of 25.379 mg/kg were found; lower amounts of serotonin were found by Lavizzari et al. (2006) [7], Adao& et al. (2005) [11] in bananas and Cirilio et al. (2003) [2] in green coffee (11.5 mg/kg, around 1.25 mg/100g respectively 1.13 mg/100g ). Mean spermidine and spermine levels of 23.303 respectively 19.164 mg/kg were found. Adao & et al. (2005) [11] found a spermidine content around 1.10 mg/100g in bananas and spermine was present at very low level. Cirilio et al. (2003) [2] also reported prevalence of spermidine to spermine in green coffee with mean levels of 0.60 mg/100g, 0.44 mg/100g respectively. Moret et al. (2005) [4] reported prevalence of spermidine to spermine in fresh vegetables (0.4–4.5 mg/100 g, a maximum of 1.1 mg/100 g respectively). The samples analyzed after seven days at room temperature showed significant lower 2-phenylethylamine content (Table 2) and no differences were found for the other biogenic amine levels, while putrescine was the most represented amine. The samples analyzed after seven days of refrigeration showed a statistical significant higher tryptamine content and a lower phenylethylamine content, and no differences were found for the others biogenic amine levels, while putrescine was the most represented amine (Table 2). It is widely known that some aromatic biogenic amines (tyramine, tryptamine, 2- phenylethylamine) exert a vasoconstrictor effect, and the quantification of these biogenic amines is important, especially due to the existence of risk consumer categories. With regard to biogenic amines' content Time (min) Gradient Flow rate (ml/min) Wavelength (nm) Column pressure (bar) Column temperature (ºC) Tray temperature (ºC) Sample volume (µl) Ammonium acetate (A) (%) Acetonitrile (B) (%) 0.01 40 60 1.00 254 minim 70 40 7 20 15 40 60 20 30 70 25 5 95 30 40 60 Food and Environment Safety - Journal of Faculty of Food Engineering, Ştefancel Mare University - Suceava Volume XIV, Issue 3 – 2015 Veronica TANASA, Daniela MOISE, Maria STANCA,Separation and cuantification of biogenic amines in bananas by High Performance Liquid Chromatography, Food and Environment Safety, Volume XIV, Issue 3 – 2015, pag. 245 – 249 249 modification during refrigeration, Moret et al. (2005) [4] reported that vegetables analyzed after a 3-week refrigeration period showed a lower spermidine content and minor differences were found for concentrations of other amines. Further investigation on more samples is required. 4. Conclusion a) We obtained the separation of all nine biogenic amines from bananas by HPLC with good resolution, including good resolution of serotonin and internal standard (1,7 diaminoheptane). b) Mean biogenic amines levels of 10.344 mg/kg (tryptamine) to 61.502 mg/kg (putrescine) were found in fresh bananas. c) After seven days of bananas storage at refrigeration temperature, their content in 2-phenylethylamin decreased significantly, while their tryptamine content increased significantly. d) After seven days of storage at room temperature, 2-phenylethylamine decreased significantly in bananas. 5. Acknowledgments We would like to thank the Romanian Ministry of Education and Scientific Research - National Authority for Scientific Research (ANCS), for supporting this work under the Excellence Research Program, CEEX IV Project - Contract no. 115/10.08.2006. All the authors declare no conflict of interest. 6. References [1]. 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