Broccoli as a rich source of dietary Sulforaphane

Yashika Shadija, D.Y Patil School of Biotechnology and Bioinformatics, Navi Mumbai

Introduction

Sulforaphane (SFN) is a compound found in green leafy vegetables like broccoli. It has been shown to protect DNA, neutralize toxins, reduce cancer cell growth, and fight inflammation.

Moderate beer consumption has been linked to lower mortality rates for diabetes and heart disease. Researchers have explored using broccoli heads in beer production because the vegetable is rich in important nutrients and compounds like polyphenols and glucosinolates (GSL).

Broccoli contains inactive compounds called organosulfur compounds. When these compounds are broken down by enzymes in the broccoli plant and bacteria in our intestines, they transform into bioactive substances known as isothiocyanates (ITC) and indoles.

These bioactive compounds have various positive effects on health. They may help prevent cancer, reduce inflammation, act as antioxidants, manage diabetes, regulate blood pressure, and support brain health. Consuming foods with high levels of these compounds, such as broccoli, can contribute to overall improvements in health.

Researchers observed that adding broccoli heads during the beer formation process results in high concentrations of sulforaphane. The process commonly utilizes Saccharomyces and Brettanomyces as precursors. Beer is one of the world’s most consumed beverages, and its consumption is expected to increase in the future. Consumers now demand less standardized beverages as well.

The researchers (Bravo PS et al. 2023) wanted to find a way to make healthy drinks using different parts of broccoli, like powder made from by-products, rather than just using the main florets. They compared these drinks to ones made from broccoli sprouts and broccoli heads. They looked at various aspects such as the physical and chemical properties, the amount of sulforaphane present, the smell and taste, and how people perceived these drinks. By doing this, they aimed to create new and innovative drinks that provide the health benefits associated with broccoli.

Studying Sulforaphanes in Beer

To conduct the experiment, the scientists required two plant materials: broccoli sprouts and broccoli powder. They did not add broccoli powder to the control batch. They macerated the samples at 10 degrees and continued the process for two weeks. Subsequently, they bottled the beer samples in 330mL glass bottles and stored them at room temperature. Later, they observed a decrease in the levels of sulforaphane. They checked the color, foam, consistency, odor, taste, bitterness, acidity, and alcohol content of the samples. They conducted the same evaluations for both the control and test batches and created a comparative study.

It was observed that broccoli buds present a higher level of alcohol content and there is no difference observed in the acidity of the control and the test batch of the beer sample.

The results obtained after the fermentation process were statistically analyzed using ANOVA to calculate the variance. The results were then associated with benefits on digestion and lipid metabolism.

The broccoli sprouts allow a 3.1-fold higher SFN concentration than broccoli powder. The pH of the brewed beer is 4.45 by sprouts and 4.08 by powder. Storing the brewed beer at 0^oC for 6 days gives a higher SFN concentration and it gradually decreases. The control beer has grain cereal, malt-biscuit, and hop and is highly bitter. The fruity profile of broccoli-supplemented beer makes the sample less bitter. Around 45 volatile compounds were identified in the sample. The isothiocyanates make the sample pungent.

Conclusion

Consumers do not demand any standard product hence it makes it easier for manufacturers to diversify the product. The introduction of dietary nutrients showed positive effects on the consumer when beer was consumed in moderate quantities. Apart from Broccoli, Cabbage and Brussels sprouts also contain Sulforaphane and could be used as alternative sources. Using analytical techniques of HPLC, the levels of the compound are measured in the beer sample. Since it is anti-inflammatory and anti-cancerous in nature, it is of high interest to incorporate into the brewing process of beer.

Also Read: Genes in Lactobacilli Produce Functional Proteins Without Antibiotics

Reference:

Sánchez-Bravo, P., Abellán, Á., Zapata, P. J., García-Viguera, C., Domínguez-Perles, R., & Giménez, M. J. (2023). Broccoli products supplemented beers provide a sustainable source of dietary sulforaphane. Food Bioscience, 51, 102259. https://doi.org/10.1016/j.fbio.2022.102259

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