Lupin (Lupinus albus L.) Seeds: Balancing the Good and the Bad and Addressing Future Challenges.

Lupinus albus L. (lupine) is a legume whose grain/seed has gained increasing interest. Its recognized nutritional properties, namely a high content of protein, dietary fiber and its low fat content, make lupine a suitable alternative not only for animal protein, but also as a substitute for more processed and less balanced flours from a nutritional point of view, used in the preparation of bread, cakes and cookies, among others. In addition, its nutritional and bioactive compounds have potential benefits for human health in the prevention and treatment of some diseases. However, the existence of some anti-nutritional compounds and contaminants reveal some concern, requiring effective methods for their detection and eventual removal. This review intends to address the potential of lupine (L. albus) in food and human health and to balance the pros and cons. Nutritional and anti-nutritional components of L. albus seeds and possible contaminants of lupine seeds are examined. The potential health benefits of lupine (seeds), including energy metabolism, cardiovascular diseases, hypertension, glucose and insulin metabolism, bower function and anticonvulsant action, are discussed based on scientific evidence (both clinical trials and studies performed with animal models).

Isoelectric point isolation and characterization of proteins from lupine cultivars as influenced by chemical and thermal treatments.

Pulses provide a significant nutritional potential for the large proportion of the population in developing countries. Lupine is among the underutilized legume crops for human food in Ethiopia and globally concomitant to its contents of bitter alkaloids. This research was initiated to investigate the effects of soaking lupine seeds of bitter and sweet varieties in water and 2% sodium carbonate (Na2CO3) solutions as grain softener on the protein extraction efficiency and its sensory acceptability. It was hypothesized that the soaking treatment results in the removal of characteristic bitterness when coupled with thermal treatment (roasting). The result showed that soaking in Na2CO3 significantly increased the protein extraction efficiency (both protein yield and quality (purity)) in the two lupine cultivars. The roasting treatment did not help much. The bitter variety of lupine soaked in Na2CO3 with no roasting treatment gave the highest protein yield (39.45%), while the sweet variety soaked in water followed by roasting exhibited the least protein yield (23.25%). The purity of the protein isolates from the lupine samples soaked in 2% Na2CO3 followed by roasting was the highest (92.29%). The non-soaked samples of the sweet variety after roasting resulted in the lowest purity (75.05%). The water holding, and oil absorption capacity, as well as the emulsification activity and foaming capacity of the protein isolates were significantly varied for the lupine varieties, and by the soaking and roasting treatments. Higher (314.38%) WHC was recorded for the protein isolates from sweet variety soaked in Na2CO3, where the bitter variety, when soaked in 2% Na2CO3 without roasting gave protein isolates of higher emulsion and foaming capacities. The research revealed also that soaking of lupine seeds in grain softeners shows a great potential as a pretreatment for enhanced protein extraction and functional desirability (in terms of emulsion and foaming capacities) as well as sensory acceptability and can be recommended for scaling up at industrial level.

GPETAFLR, a biopeptide from Lupinus angustifolius L., protects against oxidative and inflammatory damage in retinal pigment epithelium cells.

GPETAFLR, an octapeptide released from the enzymatic hydrolysis of lupine (Lupinus angustifolius L.) protein, has demonstrated anti-inflammatory effect in myeloid lineage. This work aims to evaluate in retinal pigment epithelium (RPE) cells the protective role of GPETAFLR on both oxidative and inflammatory markers known to be involved in age-related macular degeneration (AMD). In comparison with stimulated control cells, GPETAFLR increased glutathione production and diminished the secretion and gene expression of VEFG, IL-1ß, IL-6, IFNγ, and TNF-α, as well as reactive oxygen species, and nitrite output. Our findings reveal that GPETAFLR, a novel plant peptide, is able to protect against RPE oxidative stress and inflammation. Taken together, these results strongly support innovative nutritional strategies considering Lupinus angustifolius L. as source of proteins to prevent the onset and progression of AMD. PRACTICAL APPLICATIONS: We reveal a novel nutraceutical impact of GPETAFLR peptide in human RPE cells to prevent oxidative and inflammatory mediators. Our results support that the intake of Lupine angustifolius L., proposed to be a reservoir of GPETAFLR, could lessen the functional decay of RPE cells, leading therefore to a slowdown of the progress of AMD during age. Not only this work, but also future simple clinical studies should raise new nutritional strategies focused on understanding the etiological role of the foods, nutrition, and metabolism in the pathogenesis of ocular disorders.

Intoxicación por harina de altramuz: nuevas perspectivas a través de un caso clínico / Lupine flour intoxication: new insights through a case report

El altramuz es un fruto de la familia de las leguminosas que se consume ampliamente como un aperitivo en zonas del Mediterráneo, norte de África, Asia y América Latina. Contiene dos alcaloides que aportan un sabor muy amargo al fruto y tienen efecto anticolinérgico: la esparteína y la lupanina; éstos se eliminan del fruto tras someterlo a un proceso de lavado y remojado. Presentamos un caso de intoxicación por consumo de harina de altramuz: mujer de 41 años que consultó en urgencias por un cuadro agudo de malestar general, sequedad de boca, distensión abdominal, náuseas y midriasis bilateral. Los síntomas se iniciaron una hora después de haber consumido un pan casero elaborado con harina de altramuz seco. Tras instaurar tratamiento sintomático e hidratación, los síntomas desaparecieron en las siguientes horas. La intoxicación por altramuz es un cuadro clínico infrecuente y probablemente infradiagnosticado considerando lo extendido de su consumo, en particular la intoxicación por consumo de harina del mismo. Es probable que en el futuro aumente el consumo de altramuz con objeto de beneficiarse de sus propiedades saludables (mayor contenido proteico, en fibras y proteínas, mayor saciedad). Se precisan un alto índice de sospecha clínica para identificar y tratar correctamente el cuadro, y una información completa a la población general sobre la manera correcta de preparación del altramuz, alertando y concienciando de los riesgos que conlleva su consumo en estado no procesado. (AU)

Lupin is a plant member of the Leguminosae family, widely consumed as a snack in Mediterranean countries, north of Africa, Asia and Latin America. Lupine seeds may cause poisoning due to the presence of two alkaloids, sparteine and lupanine, which can cause anticholinergic effects and have a bitter taste. These substances can be eliminated from the plant after a process of washing and rinsing. A clinical case is presented. A female patient aged 41 was admitted to the Emergency Room with general malaise, mouth dryness, abdominal distension, nausea and bilateral mydriasis, all of acute onset. Symptoms started one hour after consuming a homemade bread elaborated with dry lupine seeds. Symptomatic treatment and intravenous hydration were started and the symptoms disappeared within a few hours. Lupine seed intoxication is infrequent and probably underdiagnosed, considering how widely consumed the seeds are. Lupine flour intoxication is a particularly elusive diagnosis. Lupin consumption is likely to rise in the future due to increased interest in achieving its health benefits (high protein and fiber content). A high degree of clinical suspicion is needed to correctly identify and treat the intoxication. General population should be informed about how to correctly prepare lupine seeds, alerting about the potential risks of consumption in its unprocessed state. (AU)